To realize automatic control of automobile transmission performance test stand Methods The automatic control technique of the lubricant temperature,the program- controll- edautomaticshifting of the transmission,the c...To realize automatic control of automobile transmission performance test stand Methods The automatic control technique of the lubricant temperature,the program- controll- edautomaticshifting of the transmission,the continuous adjusting of revolution speed and load, data-acquisition and data real-time processing were adopted.Results The lubricant temperature was controlled at the set temperature ±2℃.The automatic shifting of the trans- mission is simple,reliable and accurate.The automatic adjusting of load and rotation speed is rapidandaccurate,the torque divergence is ±1N·m,the rotation speed divergence is ±5r/min Conclusion The four kinds of techniques are applied into the automobile transmission perfor- mance test stand successfully. mancetest stand successfully.展开更多
The Activated Sludge Process(ASP) exhibits highly nonlinear properties. The design of an automatic control system that is robust against disturbance of inlet wastewater flow rate and has short process settling times i...The Activated Sludge Process(ASP) exhibits highly nonlinear properties. The design of an automatic control system that is robust against disturbance of inlet wastewater flow rate and has short process settling times is a challenging matter. The proposed control method is an I-P modi fied controller automatic control system with state variable feedback and control canonical form simulation diagram for the process. A more stable response is achieved with this type of modern control. Settling times of 0.48 days are achieved for the concentration of microorganisms,(reference value step increase of 50 mg·L-1) and 0.01 days for the concentration of oxygen(reference value step increase of 0.1 mg·L-1). Fluctuations of concentrations of oxygen and microorganisms after an inlet disturbance of5 × 103m3·d-1are small. Changes in the reference values of oxygen and microorganisms(increases by 10%, 20% and 30%) show satisfactory response of the system in all cases. Changes in the value of inlet wastewater flow rate disturbance(increases by 10%, 25%, 50% and 100%) are stabilized by the control system in short time. Maximum percent overshoot is also taken in consideration in all cases and the largest value is 25% which is acceptable. The proposed method with I-P controller is better for disturbance rejection and process settling times compared to the same method using PI controller. This method can substitute optimal control systems in ASP.展开更多
Automatic control over flash distillation section at SINOPEC Cangzhou Refinery has been realized, resulting in saving of propylene feedstock and emission reduction to harvest significant economic benefits.
The relationship between the automatic control method and the stability of the open canal is studied by means of numerical simulation of unsteady flow in an open canal under different methods of control. It is found t...The relationship between the automatic control method and the stability of the open canal is studied by means of numerical simulation of unsteady flow in an open canal under different methods of control. It is found the Proportional-Proportional plus Reset （P＋PR） control is more reliable than the Linear Quadratic Regulator （LQR） control. Moreover, for the P＋PR control, the hydraulic response of the constant volume method of operation is better than that of the constant downstream depth method in the type of centrally controlled canal. Therefore, an appropriate flow change rate should be chosen instead of shortening the pool length to reach an acceptable drawdown rate. For the canal with a bottom width of 40 m, side slope of 3, Manning n of 0.015, bottom slope of 0.000 04, and design flow of 600 m3/s, the pool length of more than 30 km can provide acceptable drawdown rates of 0.2 m/h when a proper flow change rate is chosen.展开更多
In accordance with the technical requirements of the full hydrogen bell anneal furnace(BAF)used for the annealing of stainless steel coils in the Baosteel Stainless Steel Business Unit,the design concept for the autom...In accordance with the technical requirements of the full hydrogen bell anneal furnace(BAF)used for the annealing of stainless steel coils in the Baosteel Stainless Steel Business Unit,the design concept for the automatic control system was introduced in the paper.The major points described concerned the infrastructure of computers and networks,system interfaces,control functions,etc.The process control system of the full hydrogen BAF(L2)was the topic and its seven main functions were introduced.The expected output was achieved and manufacturing efficiency was enhanced within three months after the BAF units were put into operation,which demonstrated that the design concept of the automatic control system introduced in the paper was correct and that its functionalities were effective.展开更多
Macadamia has the highest economic value and has always enjoyed the reputation of"king of dried fruits".In the process of digital management,irrigation is the most widely used.This paper designs the automati...Macadamia has the highest economic value and has always enjoyed the reputation of"king of dried fruits".In the process of digital management,irrigation is the most widely used.This paper designs the automatic control drip irrigation device in the digital management of macadamia nuts,including drip irrigation pipe,soil moisture sensor,motor,water storage chamber,water pump and central controller,and then gives an implementation scheme.The device is not only convenient for laying and positioning,but also convenient for controlling the overall irrigation water consumption during each drip irrigation and accurate use and improving the level of digital management.展开更多
A large part of our daily lives is spent with audio information. Massive obstacles are frequently presented by the colossal amounts of acoustic information and the incredibly quick processing times. This results in th...A large part of our daily lives is spent with audio information. Massive obstacles are frequently presented by the colossal amounts of acoustic information and the incredibly quick processing times. This results in the need for applications and methodologies that are capable of automatically analyzing these contents. These technologies can be applied in automatic contentanalysis and emergency response systems. Breaks in manual communication usually occur in emergencies leading to accidents and equipment damage. The audio signal does a good job by sending a signal underground, which warrants action from an emergency management team at the surface. This paper, therefore, seeks to design and simulate an audio signal alerting and automatic control system using Unity Pro XL to substitute manual communication of emergencies and manual control of equipment. Sound data were trained using the neural network technique of machine learning. The metrics used are Fast Fourier transform magnitude, zero crossing rate, root mean square, and percentage error. Sounds were detected with an error of approximately 17%;thus, the system can detect sounds with an accuracy of 83%. With more data training, the system can detect sounds with minimal or no error. The paper, therefore, has critical policy implications about communication, safety, and health for underground mine.展开更多
It is need to establish site project department during the construction of electric power project.The head office should design and build the main structure,continually improve structure of project department,meantime...It is need to establish site project department during the construction of electric power project.The head office should design and build the main structure,continually improve structure of project department,meantime,positively apply principle of automatic control to improve the site management of electric power construction.In this article,the application strategy of principle of automatic control is analyzed focusing on the site work of electric power construction.展开更多
Remote data monitoring has been applied in the production of CBM wells.It is necessary to realize remote regulating and automatic control on production systems of CBM wells as soon as possible,so that production cost ...Remote data monitoring has been applied in the production of CBM wells.It is necessary to realize remote regulating and automatic control on production systems of CBM wells as soon as possible,so that production cost can be reduced effectively and fine production of CBM wells can be improved.In this paper,remote production control technologies were designed based on production behaviors of CBM wells.And then,in light of the features of automatic monitoring instruments,automatic production of CBM wells was divided into four stages(i.e.before casing pressure occurring,casing pressure building,initial gas production and gas production).Finally,an automatic control program was developed and embedded into on-site control terminals after study was carried out on automatic control logics and methods of each production stage of CBM wells.It is for the first time that gas and water production of CBM wells are automatically regulated precisely and automatic CBM production modes are adopted with the linkage control of gas and water production.Based on this production network and remote control platform system,terminal operation is controlled and feedback according to the production orders which are set and delivered remotely.In this way,CBM well production is automatically controlled over long distance.Practical operation results in the Hancheng area,Shaanxi,shows that establishment and application of this automatic control platform contribute to the improvement of fine production of CBM wells and their continuous and stable production.展开更多
PLC technology in the specific application of electrical engineering automation control, mainly as the existence of the processor. Compared with the traditional system, it has incomparable advantages, which are embodi...PLC technology in the specific application of electrical engineering automation control, mainly as the existence of the processor. Compared with the traditional system, it has incomparable advantages, which are embodied in relatively high automation and reliability. So the effective application of PLC technology in electrical engineering automation control can play a very important role, give full play to and use the important role of PLC technology, help to realize the development of electrical engineering automation. This paper mainly focuses on the specific application of PLC technology in electrical engineering automation control.展开更多
In recent years, chemical plant safety emergencies have repeatedly occurred, causing concern from all walks of life. As a result, chemical companies have begun to take measures to manage safety risks in the workplace,...In recent years, chemical plant safety emergencies have repeatedly occurred, causing concern from all walks of life. As a result, chemical companies have begun to take measures to manage safety risks in the workplace, reducing the occurrence of accidents and the loss of commercial value. At the same time, chemical enterprises have formulated the planning goal of automation development, and started to combine the automatic control system in the actual production. Therefore, this paper discusses the application of automatic control system in the field of chemical safety production, and puts forward some suggestions on reducing accidents in the field of chemical safety production.展开更多
With the development of The Times, the computer automatic control technology has been applied to every corner of life and production. Many industries are beginning to use automatic or semi-automatic production lines t...With the development of The Times, the computer automatic control technology has been applied to every corner of life and production. Many industries are beginning to use automatic or semi-automatic production lines to improve production efficiency. In the manufacturing process of industrial gas, the traditional production mode has been unable to meet the needs of modern production. This design will be applied to the automatic control system for industrial gas production process. This paper first introduces the background of this design, and then briefly introduces the composition and work flow of the air separation device. Finally, the design of the measurement and control system, the design of the anti-surge control valve and the control logic design of the anti-surge control valve are introduced in three aspects of this design.展开更多
The development of society reflects the importance of energy economy. Especially in the case of rising power consumption, it is of great significance in electrical engineering and automation technology, which is direc...The development of society reflects the importance of energy economy. Especially in the case of rising power consumption, it is of great significance in electrical engineering and automation technology, which is directly related to the safety and stability of energy economy. Therefore, in the process of enterprise development, we should combine our own actual situation, promote the application of intelligent technology from all aspects of electrical engineering automation control, and provide a solid foundation for the development of enterprises.展开更多
Air compressor is an important engineering equipment that is often used. On this basis, we mainly analyze the automatic control technology of air compressor, and introduce and study the actual control effect of air co...Air compressor is an important engineering equipment that is often used. On this basis, we mainly analyze the automatic control technology of air compressor, and introduce and study the actual control effect of air compressor and its monitoring equipment. The related technical characteristics of the machine automatic control system provide the basic automation guarantee for the efficient and reliable operation of the air compressor system.展开更多
In oil and gas exploitation, a large number of various types of electrical equipment need to be used. Whether the electrical equipment can operate safely and stably largely determines the oil and gas exploitation capa...In oil and gas exploitation, a large number of various types of electrical equipment need to be used. Whether the electrical equipment can operate safely and stably largely determines the oil and gas exploitation capacity. Automation technology, as a cutting-edge technology, has been applied in all sectors of society, which has promoted the automation level of electrical equipment and made an important contribution to the improvement of productivity. The application of PLC control system in electrical automation equipment is an inevitable choice. While liberating productivity, it can reduce production costs, find and solve equipment failure problems in time, and maintain the stable operation of electrical equipment. At the same time, it can endow the oil and gas exploitation industry with sustainable development power.展开更多
In the production of thermal power plants, strengthening the inspection and maintenance of the boiler tail position can also achieve the effect of energy saving and consumption reduction, realize the replacement frequ...In the production of thermal power plants, strengthening the inspection and maintenance of the boiler tail position can also achieve the effect of energy saving and consumption reduction, realize the replacement frequency of the heating area of the boiler tail, increase the service life, and realize the improvement of the economic benefits of the thermal power plant. The management and maintenance of thermal instruments and automatic control systems is not only a technical issue, but also requires reasonable management measures and scientific management. In real life, problems can be found in time, and the equipment efficiency can be fully exerted, and the basic guarantee for the efficient power production of thermal power plants is provided.展开更多
Modern automated generation control(AGC)is increasingly complex,requiring precise frequency control for stability and operational accuracy.Traditional PID controller optimisation methods often struggle to handle nonli...Modern automated generation control(AGC)is increasingly complex,requiring precise frequency control for stability and operational accuracy.Traditional PID controller optimisation methods often struggle to handle nonlinearities and meet robustness requirements across diverse operational scenarios.This paper introduces an enhanced strategy using a multi-objective optimisation framework and a modified non-dominated sorting genetic algorithm Ⅱ(SNSGA).The proposed model optimises the PID controller by minimising key performance metrics:integration time squared error(ITSE),integration time absolute error(ITAE),and rate of change of deviation(J).This approach balances convergence rate,overshoot,and oscillation dynamics effectively.A fuzzy-based method is employed to select the most suitable solution from the Pareto set.The comparative analysis demonstrates that the SNSGA-based approach offers superior tuning capabilities over traditional NSGA-Ⅱ and other advanced control methods.In a two-area thermal power system without reheat,the SNSGA significantly reduces settling times for frequency deviations:2.94s for Δf_(1) and 4.98s for Δf_(2),marking improvements of 31.6%and 13.4%over NSGA-Ⅱ,respectively.展开更多
The Ocean 4A scatterometer, expected to be launched in 2024, is poised to be the world’s first spaceborne microwave scatterometer utilizing a digital beamforming system. To ensure high-precision measurements and perf...The Ocean 4A scatterometer, expected to be launched in 2024, is poised to be the world’s first spaceborne microwave scatterometer utilizing a digital beamforming system. To ensure high-precision measurements and performance sta-bility across diverse environments, stringent requirements are placed on the dynamic range of its receiving system. This paper provides a detailed exposition of a field-programmable gate array (FPGA)-based automatic gain control (AGC) design for the spaceborne scatterometer. Implemented on an FPGA, the algo-rithm harnesses its parallel processing capabilities and high-speed performance to monitor the received echo signals in real time. Employing an adaptive AGC algorithm, the system gene-rates gain control codes applicable to the intermediate fre-quency variable attenuator, enabling rapid and stable adjust-ment of signal amplitudes from the intermediate frequency amplifier to an optimal range. By adopting a purely digital pro-cessing approach, experimental results demonstrate that the AGC algorithm exhibits several advantages, including fast con-vergence, strong flexibility, high precision, and outstanding sta-bility. This innovative design lays a solid foundation for the high-precision measurements of the Ocean 4A scatterometer, with potential implications for the future of spaceborne microwave scatterometers.展开更多
In order to reduce the use of chemical pesticides in crop plant protection and improve the utilization efficiency of pesticides,it is necessary to study advanced application machinery and application techniques.The us...In order to reduce the use of chemical pesticides in crop plant protection and improve the utilization efficiency of pesticides,it is necessary to study advanced application machinery and application techniques.The use of unmanned aerial vehicle(UAV)for pesticide spraying has the characteristics of less application,strong penetrability,wide applicability and flexible operation scheduling,and has gradually become one of the important development directions in the field of aviation plant protection.However,the operation process of the UAV is often affected by meteorological factors and human manipulation,resulting in poor actual operation with inaccurate spray volume and uneven application.Therefore,to improve the stability and uniformity of the application of the plant protection UAV under variable operating conditions,in this paper a real-time control method was proposed for the application flow rate,and a precision variable-rate spray system was designed based on single-chip microcomputer and micro diaphragm pump that can controls the flow rate of the pump in real time with the changes of the operating state.The response s-peed of the variable-rate spray system was tested.The average control response time of the system was 0.18 s,and the average stability time of the pump flow change was 0.75 s.The test results showed that the system has a quick response to the working state and the adjustment of the target flow of the pump can be quickly completed to realize the variable-rate spray function.The research results can provide a reference for the practical application of plant protection UAV variable-rate spray system.展开更多
This note addresses diagnosis and performance degradation detection issues from an integrated viewpoint of functionality maintenance and cyber security of automatic control systems.It calls for more research attention...This note addresses diagnosis and performance degradation detection issues from an integrated viewpoint of functionality maintenance and cyber security of automatic control systems.It calls for more research attention on three aspects:(i)application of control and detection uni ed framework to enhancing the diagnosis capability of feedback control systems,(ii)projection-based fault detection,and complementary and explainable applications of projection-and machine learning-based techniques,and(iii)system performance degradation detection that is of elemental importance for today's automatic control systems.Some ideas and conceptual schemes are presented and illustrated by means of examples,serving as convincing arguments for research e orts in these aspects.They would contribute to the future development of capable diagnosis systems for functionality safe and cyber secure automatic control systems.展开更多
文摘To realize automatic control of automobile transmission performance test stand Methods The automatic control technique of the lubricant temperature,the program- controll- edautomaticshifting of the transmission,the continuous adjusting of revolution speed and load, data-acquisition and data real-time processing were adopted.Results The lubricant temperature was controlled at the set temperature ±2℃.The automatic shifting of the trans- mission is simple,reliable and accurate.The automatic adjusting of load and rotation speed is rapidandaccurate,the torque divergence is ±1N·m,the rotation speed divergence is ±5r/min Conclusion The four kinds of techniques are applied into the automobile transmission perfor- mance test stand successfully. mancetest stand successfully.
文摘The Activated Sludge Process(ASP) exhibits highly nonlinear properties. The design of an automatic control system that is robust against disturbance of inlet wastewater flow rate and has short process settling times is a challenging matter. The proposed control method is an I-P modi fied controller automatic control system with state variable feedback and control canonical form simulation diagram for the process. A more stable response is achieved with this type of modern control. Settling times of 0.48 days are achieved for the concentration of microorganisms,(reference value step increase of 50 mg·L-1) and 0.01 days for the concentration of oxygen(reference value step increase of 0.1 mg·L-1). Fluctuations of concentrations of oxygen and microorganisms after an inlet disturbance of5 × 103m3·d-1are small. Changes in the reference values of oxygen and microorganisms(increases by 10%, 20% and 30%) show satisfactory response of the system in all cases. Changes in the value of inlet wastewater flow rate disturbance(increases by 10%, 25%, 50% and 100%) are stabilized by the control system in short time. Maximum percent overshoot is also taken in consideration in all cases and the largest value is 25% which is acceptable. The proposed method with I-P controller is better for disturbance rejection and process settling times compared to the same method using PI controller. This method can substitute optimal control systems in ASP.
文摘Automatic control over flash distillation section at SINOPEC Cangzhou Refinery has been realized, resulting in saving of propylene feedstock and emission reduction to harvest significant economic benefits.
基金Supported by the National Natural Science Foundation of China (51039007, 50979076)the National Basic Research Program of China (973 Program) (2010CB428802)the Open Research Fund of Key Laboratory for Water Requirement and Regulation, Ministry of Agriculture (CWRR200901)
文摘The relationship between the automatic control method and the stability of the open canal is studied by means of numerical simulation of unsteady flow in an open canal under different methods of control. It is found the Proportional-Proportional plus Reset （P＋PR） control is more reliable than the Linear Quadratic Regulator （LQR） control. Moreover, for the P＋PR control, the hydraulic response of the constant volume method of operation is better than that of the constant downstream depth method in the type of centrally controlled canal. Therefore, an appropriate flow change rate should be chosen instead of shortening the pool length to reach an acceptable drawdown rate. For the canal with a bottom width of 40 m, side slope of 3, Manning n of 0.015, bottom slope of 0.000 04, and design flow of 600 m3/s, the pool length of more than 30 km can provide acceptable drawdown rates of 0.2 m/h when a proper flow change rate is chosen.
文摘In accordance with the technical requirements of the full hydrogen bell anneal furnace(BAF)used for the annealing of stainless steel coils in the Baosteel Stainless Steel Business Unit,the design concept for the automatic control system was introduced in the paper.The major points described concerned the infrastructure of computers and networks,system interfaces,control functions,etc.The process control system of the full hydrogen BAF(L2)was the topic and its seven main functions were introduced.The expected output was achieved and manufacturing efficiency was enhanced within three months after the BAF units were put into operation,which demonstrated that the design concept of the automatic control system introduced in the paper was correct and that its functionalities were effective.
基金Supported by Guangxi Science and Technology Program Project of China(Guike AD19245169)Yulin City Scientific Research and Technology Development Plan Project(Yushike 20202001,2019Cxpt00A4,Yushike 20204038).
文摘Macadamia has the highest economic value and has always enjoyed the reputation of"king of dried fruits".In the process of digital management,irrigation is the most widely used.This paper designs the automatic control drip irrigation device in the digital management of macadamia nuts,including drip irrigation pipe,soil moisture sensor,motor,water storage chamber,water pump and central controller,and then gives an implementation scheme.The device is not only convenient for laying and positioning,but also convenient for controlling the overall irrigation water consumption during each drip irrigation and accurate use and improving the level of digital management.
文摘A large part of our daily lives is spent with audio information. Massive obstacles are frequently presented by the colossal amounts of acoustic information and the incredibly quick processing times. This results in the need for applications and methodologies that are capable of automatically analyzing these contents. These technologies can be applied in automatic contentanalysis and emergency response systems. Breaks in manual communication usually occur in emergencies leading to accidents and equipment damage. The audio signal does a good job by sending a signal underground, which warrants action from an emergency management team at the surface. This paper, therefore, seeks to design and simulate an audio signal alerting and automatic control system using Unity Pro XL to substitute manual communication of emergencies and manual control of equipment. Sound data were trained using the neural network technique of machine learning. The metrics used are Fast Fourier transform magnitude, zero crossing rate, root mean square, and percentage error. Sounds were detected with an error of approximately 17%;thus, the system can detect sounds with an accuracy of 83%. With more data training, the system can detect sounds with minimal or no error. The paper, therefore, has critical policy implications about communication, safety, and health for underground mine.
文摘It is need to establish site project department during the construction of electric power project.The head office should design and build the main structure,continually improve structure of project department,meantime,positively apply principle of automatic control to improve the site management of electric power construction.In this article,the application strategy of principle of automatic control is analyzed focusing on the site work of electric power construction.
文摘Remote data monitoring has been applied in the production of CBM wells.It is necessary to realize remote regulating and automatic control on production systems of CBM wells as soon as possible,so that production cost can be reduced effectively and fine production of CBM wells can be improved.In this paper,remote production control technologies were designed based on production behaviors of CBM wells.And then,in light of the features of automatic monitoring instruments,automatic production of CBM wells was divided into four stages(i.e.before casing pressure occurring,casing pressure building,initial gas production and gas production).Finally,an automatic control program was developed and embedded into on-site control terminals after study was carried out on automatic control logics and methods of each production stage of CBM wells.It is for the first time that gas and water production of CBM wells are automatically regulated precisely and automatic CBM production modes are adopted with the linkage control of gas and water production.Based on this production network and remote control platform system,terminal operation is controlled and feedback according to the production orders which are set and delivered remotely.In this way,CBM well production is automatically controlled over long distance.Practical operation results in the Hancheng area,Shaanxi,shows that establishment and application of this automatic control platform contribute to the improvement of fine production of CBM wells and their continuous and stable production.
文摘PLC technology in the specific application of electrical engineering automation control, mainly as the existence of the processor. Compared with the traditional system, it has incomparable advantages, which are embodied in relatively high automation and reliability. So the effective application of PLC technology in electrical engineering automation control can play a very important role, give full play to and use the important role of PLC technology, help to realize the development of electrical engineering automation. This paper mainly focuses on the specific application of PLC technology in electrical engineering automation control.
文摘In recent years, chemical plant safety emergencies have repeatedly occurred, causing concern from all walks of life. As a result, chemical companies have begun to take measures to manage safety risks in the workplace, reducing the occurrence of accidents and the loss of commercial value. At the same time, chemical enterprises have formulated the planning goal of automation development, and started to combine the automatic control system in the actual production. Therefore, this paper discusses the application of automatic control system in the field of chemical safety production, and puts forward some suggestions on reducing accidents in the field of chemical safety production.
文摘With the development of The Times, the computer automatic control technology has been applied to every corner of life and production. Many industries are beginning to use automatic or semi-automatic production lines to improve production efficiency. In the manufacturing process of industrial gas, the traditional production mode has been unable to meet the needs of modern production. This design will be applied to the automatic control system for industrial gas production process. This paper first introduces the background of this design, and then briefly introduces the composition and work flow of the air separation device. Finally, the design of the measurement and control system, the design of the anti-surge control valve and the control logic design of the anti-surge control valve are introduced in three aspects of this design.
文摘The development of society reflects the importance of energy economy. Especially in the case of rising power consumption, it is of great significance in electrical engineering and automation technology, which is directly related to the safety and stability of energy economy. Therefore, in the process of enterprise development, we should combine our own actual situation, promote the application of intelligent technology from all aspects of electrical engineering automation control, and provide a solid foundation for the development of enterprises.
文摘Air compressor is an important engineering equipment that is often used. On this basis, we mainly analyze the automatic control technology of air compressor, and introduce and study the actual control effect of air compressor and its monitoring equipment. The related technical characteristics of the machine automatic control system provide the basic automation guarantee for the efficient and reliable operation of the air compressor system.
文摘In oil and gas exploitation, a large number of various types of electrical equipment need to be used. Whether the electrical equipment can operate safely and stably largely determines the oil and gas exploitation capacity. Automation technology, as a cutting-edge technology, has been applied in all sectors of society, which has promoted the automation level of electrical equipment and made an important contribution to the improvement of productivity. The application of PLC control system in electrical automation equipment is an inevitable choice. While liberating productivity, it can reduce production costs, find and solve equipment failure problems in time, and maintain the stable operation of electrical equipment. At the same time, it can endow the oil and gas exploitation industry with sustainable development power.
文摘In the production of thermal power plants, strengthening the inspection and maintenance of the boiler tail position can also achieve the effect of energy saving and consumption reduction, realize the replacement frequency of the heating area of the boiler tail, increase the service life, and realize the improvement of the economic benefits of the thermal power plant. The management and maintenance of thermal instruments and automatic control systems is not only a technical issue, but also requires reasonable management measures and scientific management. In real life, problems can be found in time, and the equipment efficiency can be fully exerted, and the basic guarantee for the efficient power production of thermal power plants is provided.
基金supported in part by the Science and Technology Innovation Program of Hunan Province under Grant 2022RC4028in part by the National Natural Science Foundation of China under Grant 62473204+3 种基金in part by the Chunhui Program Collaborative Scientific Research Project under Grant 202202004in part by the Natural Science Foundation of Nanjing University of Posts and Telecommunications under Grants NY221082,NY222144,and NY223075in part by the Huali Program for Excellent Talents in Nanjing University of Posts and Telecommunicationsin part by the Postgraduate Research and Practice Innovation Program of Jiangsu Province under Grant KYCX24_1215.
文摘Modern automated generation control(AGC)is increasingly complex,requiring precise frequency control for stability and operational accuracy.Traditional PID controller optimisation methods often struggle to handle nonlinearities and meet robustness requirements across diverse operational scenarios.This paper introduces an enhanced strategy using a multi-objective optimisation framework and a modified non-dominated sorting genetic algorithm Ⅱ(SNSGA).The proposed model optimises the PID controller by minimising key performance metrics:integration time squared error(ITSE),integration time absolute error(ITAE),and rate of change of deviation(J).This approach balances convergence rate,overshoot,and oscillation dynamics effectively.A fuzzy-based method is employed to select the most suitable solution from the Pareto set.The comparative analysis demonstrates that the SNSGA-based approach offers superior tuning capabilities over traditional NSGA-Ⅱ and other advanced control methods.In a two-area thermal power system without reheat,the SNSGA significantly reduces settling times for frequency deviations:2.94s for Δf_(1) and 4.98s for Δf_(2),marking improvements of 31.6%and 13.4%over NSGA-Ⅱ,respectively.
文摘The Ocean 4A scatterometer, expected to be launched in 2024, is poised to be the world’s first spaceborne microwave scatterometer utilizing a digital beamforming system. To ensure high-precision measurements and performance sta-bility across diverse environments, stringent requirements are placed on the dynamic range of its receiving system. This paper provides a detailed exposition of a field-programmable gate array (FPGA)-based automatic gain control (AGC) design for the spaceborne scatterometer. Implemented on an FPGA, the algo-rithm harnesses its parallel processing capabilities and high-speed performance to monitor the received echo signals in real time. Employing an adaptive AGC algorithm, the system gene-rates gain control codes applicable to the intermediate fre-quency variable attenuator, enabling rapid and stable adjust-ment of signal amplitudes from the intermediate frequency amplifier to an optimal range. By adopting a purely digital pro-cessing approach, experimental results demonstrate that the AGC algorithm exhibits several advantages, including fast con-vergence, strong flexibility, high precision, and outstanding sta-bility. This innovative design lays a solid foundation for the high-precision measurements of the Ocean 4A scatterometer, with potential implications for the future of spaceborne microwave scatterometers.
基金The authors acknowledge that the research was financially supported by the graduate student innovation project of Heilongjiang Bayi Agriculture University(YJSCX2017-Z03)the Youth Innovative Talent Program of Heilongjiang Bayi Agriculture University(ZRCQC201802).
文摘In order to reduce the use of chemical pesticides in crop plant protection and improve the utilization efficiency of pesticides,it is necessary to study advanced application machinery and application techniques.The use of unmanned aerial vehicle(UAV)for pesticide spraying has the characteristics of less application,strong penetrability,wide applicability and flexible operation scheduling,and has gradually become one of the important development directions in the field of aviation plant protection.However,the operation process of the UAV is often affected by meteorological factors and human manipulation,resulting in poor actual operation with inaccurate spray volume and uneven application.Therefore,to improve the stability and uniformity of the application of the plant protection UAV under variable operating conditions,in this paper a real-time control method was proposed for the application flow rate,and a precision variable-rate spray system was designed based on single-chip microcomputer and micro diaphragm pump that can controls the flow rate of the pump in real time with the changes of the operating state.The response s-peed of the variable-rate spray system was tested.The average control response time of the system was 0.18 s,and the average stability time of the pump flow change was 0.75 s.The test results showed that the system has a quick response to the working state and the adjustment of the target flow of the pump can be quickly completed to realize the variable-rate spray function.The research results can provide a reference for the practical application of plant protection UAV variable-rate spray system.
文摘This note addresses diagnosis and performance degradation detection issues from an integrated viewpoint of functionality maintenance and cyber security of automatic control systems.It calls for more research attention on three aspects:(i)application of control and detection uni ed framework to enhancing the diagnosis capability of feedback control systems,(ii)projection-based fault detection,and complementary and explainable applications of projection-and machine learning-based techniques,and(iii)system performance degradation detection that is of elemental importance for today's automatic control systems.Some ideas and conceptual schemes are presented and illustrated by means of examples,serving as convincing arguments for research e orts in these aspects.They would contribute to the future development of capable diagnosis systems for functionality safe and cyber secure automatic control systems.
