Intelligent manufacturing technology, as the core driving force of the fourth industrial revolution, is profoundly changing the production mode and industrial pattern in the field of mechanical processing. This paper ...Intelligent manufacturing technology, as the core driving force of the fourth industrial revolution, is profoundly changing the production mode and industrial pattern in the field of mechanical processing. This paper starts from the application background of intelligent manufacturing technology in the field of machining, combined with the limitations of traditional machinery manufacturing technology, systematically analyzes the application status of intelligent manufacturing technology in CNC production, equipment fault diagnosis, sensing technology and industrial robots, and provides theoretical support and practical guidance for the transformation and upgrading of machining industry. The exploration of the application path of intelligent manufacturing technology in the field of machining not only helps to enhance the core competitiveness of the industry but also provides important support for the realization of high-quality development and sustainable development goals of the manufacturing industry.展开更多
The use of Minimum Quantity Lubrication(MQL)with bio-lubricants has been extensively studied in aerospace sustainable manufacturing.Enhanced MQL technologies have been proposed to reduce tool wear and improve workpiec...The use of Minimum Quantity Lubrication(MQL)with bio-lubricants has been extensively studied in aerospace sustainable manufacturing.Enhanced MQL technologies have been proposed to reduce tool wear and improve workpiece surface integrity by increasing lubricant activity.However,the relationship between enhancement behavior,physicochemical properties of biolubricants,and processability remains unclear,presenting challenges for MQL technologies,particularly with difficult-to-machine materials.To address this gap,this paper provides an in-depth mechanism analysis and a comprehensive quantitative evaluation of the machinability of enhanced MQL technologies,considering chemistry,molecular dynamics,fluid dynamics,tribology,and heat transfer.Firstly,the cooling and lubrication enhancement mechanisms of nano-lubricants were systematically summarized.focusing on molecular structure.physical properties,and preparation processes.Secondly,the atomization enhancement mechanism of Electrostatic Minimum Quantity Lubrication(EMQL)was analyzed.revealing a 49%reduction in PM2.5 concentration during the atomization process compared to conventional MQL.Thirdly,the transport and infiltration enhancement mechanisms of bio-lubricants in cutting and grinding zones were summarized,incorporating electromagnetic fields and ultrasound-assisted processes.Finally,for cutting and grinding applications involving difficult-to-machine materials in aerospace,the optimized machinability of enhanced MQL technologies was concluded,showing a 50.1%increase in lubricant heat transfer coefficient and a 31.6%decrease in grinding temperature compared to standard MQL.This paper aims to help scientists understand the effective mechanisms,formulate process specifications,and identify future development trends in this technology.展开更多
To ensure the safety and efficacy of Chinese herbs,it is of great significance to conduct rapid quality detection of Chinese herbs at every link of their supply chain.Spectroscopic technology can reflect the overall c...To ensure the safety and efficacy of Chinese herbs,it is of great significance to conduct rapid quality detection of Chinese herbs at every link of their supply chain.Spectroscopic technology can reflect the overall chemical composition and structural characteristics of Chinese herbs,with the multi-component and multitarget characteristics of Chinese herbs.This review took the genus Paris as an example,and applications of spectroscopic technology with machine learning(ML)in supply chain of the genus Paris from seeds to medicinal materials were introduced.The specific contents included the confirmation of germplasm resources,identification of growth years,cultivar,geographical origin,and original processing and processing methods.The potential application of spectroscopic technology in genus Paris was pointed out,and the prospects of combining spectroscopic technology with blockchain were proposed.The summary and prospects presented in this paper will be beneficial to the quality control of the genus Paris in all links of its supply chain,so as to rationally use the genus Paris resources and ensure the safety and efficacy of medication.展开更多
The investigation was carried out on the technical problems of finishing the inner surface of elbow parts and the action mechanism of particles in elbow precision machining by abrasive flow.This work was analyzed and ...The investigation was carried out on the technical problems of finishing the inner surface of elbow parts and the action mechanism of particles in elbow precision machining by abrasive flow.This work was analyzed and researched by combining theory,numerical and experimental methods.The direct simulation Monte Carlo(DSMC)method and the finite element analysis method were combined to reveal the random collision of particles during the precision machining of abrasive flow.Under different inlet velocity,volume fraction and abrasive particle size,the dynamic pressure and turbulence flow energy of abrasive flow in elbow were analyzed,and the machining mechanism of particles on the wall and the influence of different machining parameters on the precision machining quality of abrasive flow were obtained.The test results show the order of the influence of different parameters on the quality of abrasive flow precision machining and establish the optimal process parameters.The results of the surface morphology before and after the precision machining of the inner surface of the elbow are discussed,and the surface roughness Ra value is reduced from 1.125μm to 0.295μm after the precision machining of the abrasive flow.The application of DSMC method provides special insights for the development of abrasive flow technology.展开更多
Digital manufacturing technology can be used in optical field to solve many problems caused by traditional machining. According to the characters of digital manufacturing and the practical applications of ultra-precis...Digital manufacturing technology can be used in optical field to solve many problems caused by traditional machining. According to the characters of digital manufacturing and the practical applications of ultra-precision machining,the process of digital ultra-precision machining and its technical contents were presented in this paper. In the conclusions,it was stated that the digitalization of ultra-precision machining will be an economical and efficient way for the production of new sorts of optical workpieces.展开更多
This paper presents a terahertz（THz）band-pass filter using ultra-precision machining technology based on Chebyshev filter prototype.This iris inductive window coupled waveguide filter was designed by using 8 resonan...This paper presents a terahertz（THz）band-pass filter using ultra-precision machining technology based on Chebyshev filter prototype.This iris inductive window coupled waveguide filter was designed by using 8 resonant cavities with a center frequency of 345 GHz and a 7% bandwidth.The final design fulfills the desired specifications and presents the minimum insertion loss of 1.55 d B and the return loss of less than 15 d B at 345 GHz.The stop-band rejection is50 d B off the center frequency about 30 GHz,which means it has a good performance of high stop-band suppression.Compared with the recent development of THz filters,this filter possesses the characteristic of simple structure and is easy to machining.展开更多
With the continuous collaborative innovation and development of Internet technology and mechanical manufacturing technology, the realization of precision machining process has become the leading innovative technology ...With the continuous collaborative innovation and development of Internet technology and mechanical manufacturing technology, the realization of precision machining process has become the leading innovative technology in the manufacturing industry. China is a big industrial country, and industry is one of the important industrial forms to promote economic development. The machinery manufacturing industry accounts for half of the construction work of industrial engineering projects. However, in order to transform China from an industrial power to an industrial power, the mechanical manufacturing industry needs to be improved from the material, structure, technology and other aspects, combined with advanced information technology means, using scientific and normative principles to complete the mechanical manufacturing content. Next, the article discusses the application of modern mechanical manufacturing technology and precision machining technology.展开更多
With the continuous improvement of China's information degree, the information process of various industries is also imperative, among which CNC technology has become one of the important technologies of China'...With the continuous improvement of China's information degree, the information process of various industries is also imperative, among which CNC technology has become one of the important technologies of China's modernization. Its development is directly related to China's economy and national strength, and many industrial developed countries are increasing the investment in numerical control technology. At present, numerical control technology has become an important way to improve production efficiency, improve quality, and enhance market competitiveness. In recent years, numerical control technology has been widely used in modern machinery manufacturing. Machinery manufacturing enterprises should improve the production and management level of machinery and equipment, and numerical control technology is the only guarantee to ensure product quality and production efficiency. This paper discusses the future machining road of CNC technology from the definition of CNC technology and its application and development in modern machining.展开更多
In the process of machining, it is difficult to eliminate the errors due to various factors, which will affect the final product quality. In order to actively control the errors in mechanical processing, it is necessa...In the process of machining, it is difficult to eliminate the errors due to various factors, which will affect the final product quality. In order to actively control the errors in mechanical processing, it is necessary to effectively apply modern mechanical processing technology and actively adopt precision processing technology to ensure the product quality and meet the increasing demand of users. Precision machining technology and mechanical design and manufacturing technology are complementary relations. They are interrelated and promote each other. This benign relationship greatly promotes the development of China's economy and industry.展开更多
As the technical content of promoting industrial development in the industrial field, the in-depth study of modern mechanical manufacturing technology and precision machining technology is not only conducive to improv...As the technical content of promoting industrial development in the industrial field, the in-depth study of modern mechanical manufacturing technology and precision machining technology is not only conducive to improving the development level of China's manufacturing industry, but also of great significance to industrial enterprises. However, due to the late development of advanced technology in China, the development of mechanical manufacturing technology and precision machining technology is not perfect, and there are still some problems, such as insufficient degree of automation, inadequate application of machining technology and so on. Relevant enterprises should carry out analysis and research, understand the characteristics and advantages of modern machinery manufacturing and the application mode of precision machining technology, select the integrated application of technology according to different product characteristics and requirements, improve the quality of machinery manufacturing and service quality, promote the accelerated development of China’s machinery manufacturing industry and contribute to China’s economic construction.展开更多
With the acceleration of digital process, the application of NC machining technology in China is more extensive. It will greatly improve the efficiency of production and processing, effectively reduce production costs...With the acceleration of digital process, the application of NC machining technology in China is more extensive. It will greatly improve the efficiency of production and processing, effectively reduce production costs, accelerate the development of Chinese mechanical processing and make it develop towards the direction of automation and intelligence. Of course, in recent years, the field of machining in China has developed rapidly under the digital technology. Although compared with developed countries, there is still a certain gap and there is a large space for improvement. But as long as we pay more attention to the field of mechanical processing, introduce advanced production and processing technology, explore the problems in the production process with a positive vision and through targeted solutions, we can achieve faster development in the field of mechanical processing.展开更多
Modern mechanical manufacturing technology and precision machining technology have a positive role in promoting the whole industrial production. However, with the development of modern science and technology, the actu...Modern mechanical manufacturing technology and precision machining technology have a positive role in promoting the whole industrial production. However, with the development of modern science and technology, the actual requirements of modern mechanical manufacturing technology and precision machining technology are gradually improving, forcing the current enterprises to make appropriate adjustments in combination with the actual requirements of modern industrial production. Therefore, under the requirements of current production management, this paper makes a comprehensive analysis and exploration of the relationship between modern mechanical manufacturing technology and precision processing technology, further combs out the practical problems existing in the whole industrial production of modern mechanical manufacturing technology and precision processing technology, and judges the relevant contents involved in the modern mechanical manufacturing and processing technology, in order to promote the transformation of industrial production mode and improve the overall quality of industrial production management in our country.展开更多
As artificial intelligence(AI)technology has continued to develop,its efficient data processing and pattern recognition capabilities have significantly improved the precision and speed of decision-making processes,and...As artificial intelligence(AI)technology has continued to develop,its efficient data processing and pattern recognition capabilities have significantly improved the precision and speed of decision-making processes,and it has been widely applied across various fields.In the field of astronomy,AI techniques have demonstrated unique advantages,particularly in the identification of pulsars and their candidates.AI is able to address the challenges of pulsar celestial body identification and classification because of its accuracy and efficiency.This paper systematically surveys commonly used AI models for pulsar candidate identification,analyzing and discussing the typical applications of machine learning,artificial neural networks,convolutional neural networks,and generative adversarial networks in candidate identification.Furthermore,it explores how th.e introduction of AI techniques not only enhances the efficiency and accuracy of pulsar identification but also provides new perspectives and tools for pulsar survey data processing,thus playing a significant role in advancing pulsar research and the field of astronomy.展开更多
A procedure to recognize individual discontinuities in rock mass from measurement while drilling(MWD)technology is developed,using the binary pattern of structural rock characteristics obtained from in-hole images for...A procedure to recognize individual discontinuities in rock mass from measurement while drilling(MWD)technology is developed,using the binary pattern of structural rock characteristics obtained from in-hole images for calibration.Data from two underground operations with different drilling technology and different rock mass characteristics are considered,which generalizes the application of the methodology to different sites and ensures the full operational integration of MWD data analysis.Two approaches are followed for site-specific structural model building:a discontinuity index(DI)built from variations in MWD parameters,and a machine learning(ML)classifier as function of the drilling parameters and their variability.The prediction ability of the models is quantitatively assessed as the rate of recognition of discontinuities observed in borehole logs.Differences between the parameters involved in the models for each site,and differences in their weights,highlight the site-dependence of the resulting models.The ML approach offers better performance than the classical DI,with recognition rates in the range 89%to 96%.However,the simpler DI still yields fairly accurate results,with recognition rates 70%to 90%.These results validate the adaptive MWD-based methodology as an engineering solution to predict rock structural condition in underground mining operations.展开更多
The 2018 Joint International Congress of ILTS,ELITA and LICAGE were held in Lisbon,Portugal on May 23–26,2018.The exciting and innovative program brought together 1144 experts in liver transplantation(LT)such as surg...The 2018 Joint International Congress of ILTS,ELITA and LICAGE were held in Lisbon,Portugal on May 23–26,2018.The exciting and innovative program brought together 1144 experts in liver transplantation(LT)such as surgeons,physicians or basic scientists from 61 countries.The presentations included 110 invited speakers,181 oral presentations,and 545 posters.This editorial highlights some of the most innovative and impactful presentations in展开更多
Fiber reinforced ceramic matrix composites(FRCMCs)are the preferred materials for safety critical components in the fields of aerospace,nuclear engineering,and transportation,with broad market and application prospect...Fiber reinforced ceramic matrix composites(FRCMCs)are the preferred materials for safety critical components in the fields of aerospace,nuclear engineering,and transportation,with broad market and application prospects.However,due to the characteristics of multiphase,heterogeneity,and anisotropy,key issues such as poor adhesion,high porosity,and crack propagation urgently need to be addressed in the fabrication and machining of FRCMCs.With the increasing demand for FRCMCs parts,high-quality and reliable design and fabrication,performance evaluation,and precision manufacturing have become a series of hot issues.There is a lack of systematic review in capturing the current research status and development direction of FRCMCs fabrication and machining.This research aims to comprehensively review and critically evaluate the existing understanding of the fabrication and machining of FRCMCs.This study can provide scientists with a deeper understanding of the shape control mechanism of FRCMCs fabrication and machining,the theoretical basis of material synchronous removal,machining performance,and development direction.Firstly,the basic characteristics and application background of FRCMCs are introduced.Secondly,by comparing and analyzing the typical fabrication process of FRCMCs,the advantages,disadvantages,and performance evaluation of different processes are comprehensively evaluated.Thirdly,the material removal mechanisms and machining performance evaluation standards of traditional mechanical machining technologies(drilling,milling,grinding)and non-traditional mechanical machining technologies(ultrasonic,laser,water jet,discharge,wire saw,and multi-field hybrid machining)are discussed and analyzed.Finally,the challenges,development trends,and prospects faced by FRCMCs in the fields of fabrication,machining,and application are analyzed.This study not only elucidates the basic processes and key difficulties in the fabrication of FRCMCs,but also provides valuable insights for low-damage machining.展开更多
Taoren and Xingren are commonly used herbs in East Asian medicine with different medication functions but huge economic differences,and there are cases of adulterated sales in market transactions.An effective adultera...Taoren and Xingren are commonly used herbs in East Asian medicine with different medication functions but huge economic differences,and there are cases of adulterated sales in market transactions.An effective adulteration recognition based on hyperspectral technology and machine learning was designed as a non-destructive testing method in this paper.A hyperspectral dataset comprising 500 Taoren and 500 Xingren samples was established;six feature selection methods were considered in the modeling of radial basis function-support vector machine(RBF-SVM),whose interaction between the two optimization methods was further researched.Two mixed metaheuristics modeling methods,Mixed-PSO and Mixed-SA,were designed,which fused both band selection and hyperparameter optimization from two-stage into one with detailed process analysis.The metrics of this mixed model were improved by comparing with traditional two-stage method.The accuracy of Mixed-PSO was 89.2%in five-floods crossvalidation that increased 4.818%than vanilla RBF-SVM;the accuracy of Mixed-SA was 88.7%which could reach the same as the traditional two-stage method,but it only relied on 48 crux bands in full 100 bands in RBF-SVM model fitting.展开更多
This paper focuses on the key issues of tool wear condition monitoring in the field of machining,and deeply discusses the application of digital twin technology in this aspect.This paper expounds the principle and arc...This paper focuses on the key issues of tool wear condition monitoring in the field of machining,and deeply discusses the application of digital twin technology in this aspect.This paper expounds the principle and architecture of digital twin technology,analyzes its specific methods in tool wear data acquisition,modeling,simulation,and real-time monitoring,and shows the significant advantages of this technology in improving the accuracy of tool wear monitoring and realizing predictive maintenance.At the same time,the challenges faced by digital twin technology in tool wear condition monitoring are discussed,and the corresponding development direction is put forward,aiming to provide theoretical reference and practical guidance for optimizing tool management by digital twin technology in the machining industry.展开更多
Financial technology(FinTech)has emerged as a key policy instrument for transforming economic development models.Whether it can energize the low-carbon economy and enhance carbon emission efficiency(CEE)has drawn incr...Financial technology(FinTech)has emerged as a key policy instrument for transforming economic development models.Whether it can energize the low-carbon economy and enhance carbon emission efficiency(CEE)has drawn increasing scholarly attention.Using panel data from 278 Chinese cities(2006–2021),this study constructs a quasi-natural experiment and applies a difference-in-differences(DID)model to evaluate the policy effects of FinTech on CEE.Mediation and moderation models further explore the mechanisms underlying this relationship.The findings reveal that FinTech significantly improves CEE,generating policy dividends that advance low-carbon development.This conclusion remains robust under dual machine learning causal inference,propensity score matching DID,and other robustness tests.Financing constraints,innovation level,and industrial structure upgrading fully mediate the effect of FinTech on CEE,where financing constraints and innovation show positive mediation effects,while industrial structure upgrading has a negative one.Moreover,financial agglomeration weakens FinTech’s positive influence on CEE,and the effects differ across regions,development levels,and resource endowments.This study broadens the analytical framework connecting FinTech and CEE and deepens understanding of the mechanisms linking financial innovation to lowcarbon transition.展开更多
In daily life,human need various senses to obtain information about their surroundings,and touch is one of the five major human sensing signals.Similarly,it is extremely important for robots to be endowed with tactile...In daily life,human need various senses to obtain information about their surroundings,and touch is one of the five major human sensing signals.Similarly,it is extremely important for robots to be endowed with tactile sensing ability.In recent years,vision-based tactile sensing technology has been the research hotspot and frontier in the field of tactile perception.Compared to conventional tactile sensing technologies,vision-based tactile sensing technologies are capable of obtaining highquality and high-resolution tactile information at a lower cost,while not being limited by the size and shape of sensors.Several previous articles have reviewed the sensing mechanism and electrical components of vision-based sensors,greatly promoting the innovation of tactile sensing.Different from existing reviews,this article concentrates on the underlying tracking method which converts real-time images into deformation information,including contact,sliding and friction.We will show the history and development of both model-based and model-free tracking methods,among which model-based approaches rely on schematic mechanical theories,and model-free approaches mainly involve machine learning algorithms.Comparing the efficiency and accuracy of existing deformation tracking methods,future research directions of vision-based tactile sensors for smart manipulations and robots are also discussed.展开更多
文摘Intelligent manufacturing technology, as the core driving force of the fourth industrial revolution, is profoundly changing the production mode and industrial pattern in the field of mechanical processing. This paper starts from the application background of intelligent manufacturing technology in the field of machining, combined with the limitations of traditional machinery manufacturing technology, systematically analyzes the application status of intelligent manufacturing technology in CNC production, equipment fault diagnosis, sensing technology and industrial robots, and provides theoretical support and practical guidance for the transformation and upgrading of machining industry. The exploration of the application path of intelligent manufacturing technology in the field of machining not only helps to enhance the core competitiveness of the industry but also provides important support for the realization of high-quality development and sustainable development goals of the manufacturing industry.
基金supported by the following organizations:the Special Fund of Taishan Scholars Project(No.tsqn202211179)the National Natural Science Foundation of China(No.52105457)+2 种基金Young Talent of Lifting engineering for Science and Technology in Shandong,China(No.SDAST2021qt12)the National Natural Science Foundation of China(No.52375447)China Postdoctoral Science Foundation Funded Project(No.2023M732826).
文摘The use of Minimum Quantity Lubrication(MQL)with bio-lubricants has been extensively studied in aerospace sustainable manufacturing.Enhanced MQL technologies have been proposed to reduce tool wear and improve workpiece surface integrity by increasing lubricant activity.However,the relationship between enhancement behavior,physicochemical properties of biolubricants,and processability remains unclear,presenting challenges for MQL technologies,particularly with difficult-to-machine materials.To address this gap,this paper provides an in-depth mechanism analysis and a comprehensive quantitative evaluation of the machinability of enhanced MQL technologies,considering chemistry,molecular dynamics,fluid dynamics,tribology,and heat transfer.Firstly,the cooling and lubrication enhancement mechanisms of nano-lubricants were systematically summarized.focusing on molecular structure.physical properties,and preparation processes.Secondly,the atomization enhancement mechanism of Electrostatic Minimum Quantity Lubrication(EMQL)was analyzed.revealing a 49%reduction in PM2.5 concentration during the atomization process compared to conventional MQL.Thirdly,the transport and infiltration enhancement mechanisms of bio-lubricants in cutting and grinding zones were summarized,incorporating electromagnetic fields and ultrasound-assisted processes.Finally,for cutting and grinding applications involving difficult-to-machine materials in aerospace,the optimized machinability of enhanced MQL technologies was concluded,showing a 50.1%increase in lubricant heat transfer coefficient and a 31.6%decrease in grinding temperature compared to standard MQL.This paper aims to help scientists understand the effective mechanisms,formulate process specifications,and identify future development trends in this technology.
基金funded by the Special Program for the Major Science and Technology Projects of Yunnan Province,China(Grant No.:202202AE090001).
文摘To ensure the safety and efficacy of Chinese herbs,it is of great significance to conduct rapid quality detection of Chinese herbs at every link of their supply chain.Spectroscopic technology can reflect the overall chemical composition and structural characteristics of Chinese herbs,with the multi-component and multitarget characteristics of Chinese herbs.This review took the genus Paris as an example,and applications of spectroscopic technology with machine learning(ML)in supply chain of the genus Paris from seeds to medicinal materials were introduced.The specific contents included the confirmation of germplasm resources,identification of growth years,cultivar,geographical origin,and original processing and processing methods.The potential application of spectroscopic technology in genus Paris was pointed out,and the prospects of combining spectroscopic technology with blockchain were proposed.The summary and prospects presented in this paper will be beneficial to the quality control of the genus Paris in all links of its supply chain,so as to rationally use the genus Paris resources and ensure the safety and efficacy of medication.
基金Projects(51206011,U1937201)supported by the National Natural Science Foundation of ChinaProject(20200301040RQ)supported by the Science and Technology Development Program of Jilin Province,China+1 种基金Project(JJKH20190541KJ)supported by the Education Department of Jilin Province,ChinaProject(18DY017)supported by Changchun Science and Technology Program of Changchun City,China。
文摘The investigation was carried out on the technical problems of finishing the inner surface of elbow parts and the action mechanism of particles in elbow precision machining by abrasive flow.This work was analyzed and researched by combining theory,numerical and experimental methods.The direct simulation Monte Carlo(DSMC)method and the finite element analysis method were combined to reveal the random collision of particles during the precision machining of abrasive flow.Under different inlet velocity,volume fraction and abrasive particle size,the dynamic pressure and turbulence flow energy of abrasive flow in elbow were analyzed,and the machining mechanism of particles on the wall and the influence of different machining parameters on the precision machining quality of abrasive flow were obtained.The test results show the order of the influence of different parameters on the quality of abrasive flow precision machining and establish the optimal process parameters.The results of the surface morphology before and after the precision machining of the inner surface of the elbow are discussed,and the surface roughness Ra value is reduced from 1.125μm to 0.295μm after the precision machining of the abrasive flow.The application of DSMC method provides special insights for the development of abrasive flow technology.
文摘Digital manufacturing technology can be used in optical field to solve many problems caused by traditional machining. According to the characters of digital manufacturing and the practical applications of ultra-precision machining,the process of digital ultra-precision machining and its technical contents were presented in this paper. In the conclusions,it was stated that the digitalization of ultra-precision machining will be an economical and efficient way for the production of new sorts of optical workpieces.
基金supported by the National Natural Science Foundation of China under Grant No.61434006
文摘This paper presents a terahertz（THz）band-pass filter using ultra-precision machining technology based on Chebyshev filter prototype.This iris inductive window coupled waveguide filter was designed by using 8 resonant cavities with a center frequency of 345 GHz and a 7% bandwidth.The final design fulfills the desired specifications and presents the minimum insertion loss of 1.55 d B and the return loss of less than 15 d B at 345 GHz.The stop-band rejection is50 d B off the center frequency about 30 GHz,which means it has a good performance of high stop-band suppression.Compared with the recent development of THz filters,this filter possesses the characteristic of simple structure and is easy to machining.
文摘With the continuous collaborative innovation and development of Internet technology and mechanical manufacturing technology, the realization of precision machining process has become the leading innovative technology in the manufacturing industry. China is a big industrial country, and industry is one of the important industrial forms to promote economic development. The machinery manufacturing industry accounts for half of the construction work of industrial engineering projects. However, in order to transform China from an industrial power to an industrial power, the mechanical manufacturing industry needs to be improved from the material, structure, technology and other aspects, combined with advanced information technology means, using scientific and normative principles to complete the mechanical manufacturing content. Next, the article discusses the application of modern mechanical manufacturing technology and precision machining technology.
文摘With the continuous improvement of China's information degree, the information process of various industries is also imperative, among which CNC technology has become one of the important technologies of China's modernization. Its development is directly related to China's economy and national strength, and many industrial developed countries are increasing the investment in numerical control technology. At present, numerical control technology has become an important way to improve production efficiency, improve quality, and enhance market competitiveness. In recent years, numerical control technology has been widely used in modern machinery manufacturing. Machinery manufacturing enterprises should improve the production and management level of machinery and equipment, and numerical control technology is the only guarantee to ensure product quality and production efficiency. This paper discusses the future machining road of CNC technology from the definition of CNC technology and its application and development in modern machining.
文摘In the process of machining, it is difficult to eliminate the errors due to various factors, which will affect the final product quality. In order to actively control the errors in mechanical processing, it is necessary to effectively apply modern mechanical processing technology and actively adopt precision processing technology to ensure the product quality and meet the increasing demand of users. Precision machining technology and mechanical design and manufacturing technology are complementary relations. They are interrelated and promote each other. This benign relationship greatly promotes the development of China's economy and industry.
文摘As the technical content of promoting industrial development in the industrial field, the in-depth study of modern mechanical manufacturing technology and precision machining technology is not only conducive to improving the development level of China's manufacturing industry, but also of great significance to industrial enterprises. However, due to the late development of advanced technology in China, the development of mechanical manufacturing technology and precision machining technology is not perfect, and there are still some problems, such as insufficient degree of automation, inadequate application of machining technology and so on. Relevant enterprises should carry out analysis and research, understand the characteristics and advantages of modern machinery manufacturing and the application mode of precision machining technology, select the integrated application of technology according to different product characteristics and requirements, improve the quality of machinery manufacturing and service quality, promote the accelerated development of China’s machinery manufacturing industry and contribute to China’s economic construction.
文摘With the acceleration of digital process, the application of NC machining technology in China is more extensive. It will greatly improve the efficiency of production and processing, effectively reduce production costs, accelerate the development of Chinese mechanical processing and make it develop towards the direction of automation and intelligence. Of course, in recent years, the field of machining in China has developed rapidly under the digital technology. Although compared with developed countries, there is still a certain gap and there is a large space for improvement. But as long as we pay more attention to the field of mechanical processing, introduce advanced production and processing technology, explore the problems in the production process with a positive vision and through targeted solutions, we can achieve faster development in the field of mechanical processing.
文摘Modern mechanical manufacturing technology and precision machining technology have a positive role in promoting the whole industrial production. However, with the development of modern science and technology, the actual requirements of modern mechanical manufacturing technology and precision machining technology are gradually improving, forcing the current enterprises to make appropriate adjustments in combination with the actual requirements of modern industrial production. Therefore, under the requirements of current production management, this paper makes a comprehensive analysis and exploration of the relationship between modern mechanical manufacturing technology and precision processing technology, further combs out the practical problems existing in the whole industrial production of modern mechanical manufacturing technology and precision processing technology, and judges the relevant contents involved in the modern mechanical manufacturing and processing technology, in order to promote the transformation of industrial production mode and improve the overall quality of industrial production management in our country.
基金supported by the National Key R&D Program of China(2021YFC2203502 and 2022YFF0711502)the National Natural Science Foundation of China(NSFC)(12173077)+4 种基金the Tianshan Talent Project of Xinjiang Uygur Autonomous Region(2022TSYCCX0095 and 2023TSYCCX0112)the Scientific Instrument Developing Project of the Chinese Academy of Sciences(PTYQ2022YZZD01)China National Astronomical Data Center(NADC)the Operation,Maintenance and Upgrading Fund for Astronomical Telescopes and Facility Instruments,budgeted from the Ministry of Finance of China(MOF)and administrated by the Chinese Academy of Sciences(CAS)Natural Science Foundation of Xinjiang Uygur Autonomous Region(2022D01A360)。
文摘As artificial intelligence(AI)technology has continued to develop,its efficient data processing and pattern recognition capabilities have significantly improved the precision and speed of decision-making processes,and it has been widely applied across various fields.In the field of astronomy,AI techniques have demonstrated unique advantages,particularly in the identification of pulsars and their candidates.AI is able to address the challenges of pulsar celestial body identification and classification because of its accuracy and efficiency.This paper systematically surveys commonly used AI models for pulsar candidate identification,analyzing and discussing the typical applications of machine learning,artificial neural networks,convolutional neural networks,and generative adversarial networks in candidate identification.Furthermore,it explores how th.e introduction of AI techniques not only enhances the efficiency and accuracy of pulsar identification but also provides new perspectives and tools for pulsar survey data processing,thus playing a significant role in advancing pulsar research and the field of astronomy.
基金conducted under the illu MINEation project, funded by the European Union’s Horizon 2020 research and innovation program under grant agreement (No. 869379)supported by the China Scholarship Council (No. 202006370006)
文摘A procedure to recognize individual discontinuities in rock mass from measurement while drilling(MWD)technology is developed,using the binary pattern of structural rock characteristics obtained from in-hole images for calibration.Data from two underground operations with different drilling technology and different rock mass characteristics are considered,which generalizes the application of the methodology to different sites and ensures the full operational integration of MWD data analysis.Two approaches are followed for site-specific structural model building:a discontinuity index(DI)built from variations in MWD parameters,and a machine learning(ML)classifier as function of the drilling parameters and their variability.The prediction ability of the models is quantitatively assessed as the rate of recognition of discontinuities observed in borehole logs.Differences between the parameters involved in the models for each site,and differences in their weights,highlight the site-dependence of the resulting models.The ML approach offers better performance than the classical DI,with recognition rates in the range 89%to 96%.However,the simpler DI still yields fairly accurate results,with recognition rates 70%to 90%.These results validate the adaptive MWD-based methodology as an engineering solution to predict rock structural condition in underground mining operations.
基金supported by grants from China Postdoctoral Science Foundation(2017M610374)National Natural Science Foundation of China(81470891)+2 种基金Science and Technology Bureau of Zhejiang Province,China(2016C33145)Innovative Research Groups of the National Natural Science Foundation of China(81421062)the Fundamental Research Funds for the Central Universities(2018FZA7003)
文摘The 2018 Joint International Congress of ILTS,ELITA and LICAGE were held in Lisbon,Portugal on May 23–26,2018.The exciting and innovative program brought together 1144 experts in liver transplantation(LT)such as surgeons,physicians or basic scientists from 61 countries.The presentations included 110 invited speakers,181 oral presentations,and 545 posters.This editorial highlights some of the most innovative and impactful presentations in
基金supported by Key Laboratory of Higheffciency and Clean Mechanical Manufacture at Shandong University,Ministry of Education,the National Natural Science Foundation of China(Nos.52305484,52305475,and U23A20632)the China Postdoctoral Science Foundation(No.2024M761876)+7 种基金the Youth Innovation Team Program of Universities in Shandong Province(No.2024KJH166)the National Key Research and Development Program of China(No.2023YFC2413301)the Taishan Scholars Program(No.tsqn202408242)the Shandong Provincial Natural Science Foundation(Nos.ZR2022QE053 and ZR2022QE159)the Guangdong Basic and Applied Basic Research Foundation(No.2022A1515111124)the Major Scientific and Technological Innovation Project of Shandong Province(No.2023CXGC010207)the Major Basic Research of Shandong Provincial Natural Science Foundation(No.ZR2023ZD34)the talent research project for the pilot project of integrating science,education,and industries of Qilu University of Technology(Shandong Academy of Sciences)(No.2024RCKY009)。
文摘Fiber reinforced ceramic matrix composites(FRCMCs)are the preferred materials for safety critical components in the fields of aerospace,nuclear engineering,and transportation,with broad market and application prospects.However,due to the characteristics of multiphase,heterogeneity,and anisotropy,key issues such as poor adhesion,high porosity,and crack propagation urgently need to be addressed in the fabrication and machining of FRCMCs.With the increasing demand for FRCMCs parts,high-quality and reliable design and fabrication,performance evaluation,and precision manufacturing have become a series of hot issues.There is a lack of systematic review in capturing the current research status and development direction of FRCMCs fabrication and machining.This research aims to comprehensively review and critically evaluate the existing understanding of the fabrication and machining of FRCMCs.This study can provide scientists with a deeper understanding of the shape control mechanism of FRCMCs fabrication and machining,the theoretical basis of material synchronous removal,machining performance,and development direction.Firstly,the basic characteristics and application background of FRCMCs are introduced.Secondly,by comparing and analyzing the typical fabrication process of FRCMCs,the advantages,disadvantages,and performance evaluation of different processes are comprehensively evaluated.Thirdly,the material removal mechanisms and machining performance evaluation standards of traditional mechanical machining technologies(drilling,milling,grinding)and non-traditional mechanical machining technologies(ultrasonic,laser,water jet,discharge,wire saw,and multi-field hybrid machining)are discussed and analyzed.Finally,the challenges,development trends,and prospects faced by FRCMCs in the fields of fabrication,machining,and application are analyzed.This study not only elucidates the basic processes and key difficulties in the fabrication of FRCMCs,but also provides valuable insights for low-damage machining.
基金Supported by the Natural Science Foundation of Heilongjiang Province(LH2020C003)。
文摘Taoren and Xingren are commonly used herbs in East Asian medicine with different medication functions but huge economic differences,and there are cases of adulterated sales in market transactions.An effective adulteration recognition based on hyperspectral technology and machine learning was designed as a non-destructive testing method in this paper.A hyperspectral dataset comprising 500 Taoren and 500 Xingren samples was established;six feature selection methods were considered in the modeling of radial basis function-support vector machine(RBF-SVM),whose interaction between the two optimization methods was further researched.Two mixed metaheuristics modeling methods,Mixed-PSO and Mixed-SA,were designed,which fused both band selection and hyperparameter optimization from two-stage into one with detailed process analysis.The metrics of this mixed model were improved by comparing with traditional two-stage method.The accuracy of Mixed-PSO was 89.2%in five-floods crossvalidation that increased 4.818%than vanilla RBF-SVM;the accuracy of Mixed-SA was 88.7%which could reach the same as the traditional two-stage method,but it only relied on 48 crux bands in full 100 bands in RBF-SVM model fitting.
文摘This paper focuses on the key issues of tool wear condition monitoring in the field of machining,and deeply discusses the application of digital twin technology in this aspect.This paper expounds the principle and architecture of digital twin technology,analyzes its specific methods in tool wear data acquisition,modeling,simulation,and real-time monitoring,and shows the significant advantages of this technology in improving the accuracy of tool wear monitoring and realizing predictive maintenance.At the same time,the challenges faced by digital twin technology in tool wear condition monitoring are discussed,and the corresponding development direction is put forward,aiming to provide theoretical reference and practical guidance for optimizing tool management by digital twin technology in the machining industry.
基金supported by the National Natural Science Foundation of China[Grant No.72371179]the Social Science Foundation of Jiangsu Province[Grant Nos.25GLB009 and 25ZXZD010]+3 种基金the Talent Cultivation Foundation of Southwest University of Science and Technology[Grant No.25sx7003]the Key Laboratory of Green Materials Development and Innovation[Grant No.LSCL-2502]the Major Special Project of the Sichuan Provincial Philosophy and Social Science Foundation[Grant No.SCJJ24ZD30]the Collaborative Innovation Center for New Urbanization and Social Governance of Soochow University.
文摘Financial technology(FinTech)has emerged as a key policy instrument for transforming economic development models.Whether it can energize the low-carbon economy and enhance carbon emission efficiency(CEE)has drawn increasing scholarly attention.Using panel data from 278 Chinese cities(2006–2021),this study constructs a quasi-natural experiment and applies a difference-in-differences(DID)model to evaluate the policy effects of FinTech on CEE.Mediation and moderation models further explore the mechanisms underlying this relationship.The findings reveal that FinTech significantly improves CEE,generating policy dividends that advance low-carbon development.This conclusion remains robust under dual machine learning causal inference,propensity score matching DID,and other robustness tests.Financing constraints,innovation level,and industrial structure upgrading fully mediate the effect of FinTech on CEE,where financing constraints and innovation show positive mediation effects,while industrial structure upgrading has a negative one.Moreover,financial agglomeration weakens FinTech’s positive influence on CEE,and the effects differ across regions,development levels,and resource endowments.This study broadens the analytical framework connecting FinTech and CEE and deepens understanding of the mechanisms linking financial innovation to lowcarbon transition.
基金supported by the National Key Research and Development of China(Grant No.2022YFB3805700)the National Natural Science Foundation of China(Grant Nos.12122202 and 12372162)the Fundamental Research Funds for the Central Universities(Grant No.2024CX06021).
文摘In daily life,human need various senses to obtain information about their surroundings,and touch is one of the five major human sensing signals.Similarly,it is extremely important for robots to be endowed with tactile sensing ability.In recent years,vision-based tactile sensing technology has been the research hotspot and frontier in the field of tactile perception.Compared to conventional tactile sensing technologies,vision-based tactile sensing technologies are capable of obtaining highquality and high-resolution tactile information at a lower cost,while not being limited by the size and shape of sensors.Several previous articles have reviewed the sensing mechanism and electrical components of vision-based sensors,greatly promoting the innovation of tactile sensing.Different from existing reviews,this article concentrates on the underlying tracking method which converts real-time images into deformation information,including contact,sliding and friction.We will show the history and development of both model-based and model-free tracking methods,among which model-based approaches rely on schematic mechanical theories,and model-free approaches mainly involve machine learning algorithms.Comparing the efficiency and accuracy of existing deformation tracking methods,future research directions of vision-based tactile sensors for smart manipulations and robots are also discussed.
