The original online version of this article was revised:Several errors occurred in the published version of the article.These have now been corrected as follows:Page 2,section"2.2 Laser Texturing Procedure of Sur...The original online version of this article was revised:Several errors occurred in the published version of the article.These have now been corrected as follows:Page 2,section"2.2 Laser Texturing Procedure of Surfaces",line 2:The device name was corrected from"YDFLP-E-50-M8"to"YDFLP-50-M8."Page 3,Section 2.4:The phrase"95%confidence interval"has been corrected to"95%confidence level."Page 3,Figure 1 caption:The phrase"fandg"has been corrected to"f and g."The order"C4 and C12"has been reversed to"C12 and C4,"in accordance with the display order in the figure.Page 4,Figure reference:The phrase"Figs.4c and d"has been corrected to"Figs.5b and c."Page 5,paragraph starting with"The ANOVA results are presented...":The phrase"95%confidence interval"has been corrected to"95%confidence level."展开更多
The joining of Fe Cr Al alloy and Carbon Fiber Reinforced Thermoplastic Composites(CFRTP)presents a promising strategy for the development of lightweight and structurally reliable components.In this study,ultrasonic w...The joining of Fe Cr Al alloy and Carbon Fiber Reinforced Thermoplastic Composites(CFRTP)presents a promising strategy for the development of lightweight and structurally reliable components.In this study,ultrasonic welding,noted for its efficiency and environmentally sustainable characteristics,was employed to examine systematically examine the impact of surface texturing on joint performance.Two distinct categories of Fe Cr Al surface textures,discrete unit patterns and continuous groove structures,were created and subsequently welded with Short Carbon Fiber Reinforced Polyamide 6(SCFR-PA6).The wettability of molten SCFR-PA6 on the textured surfaces and the bonding strength of the resulting joints were evaluated,alongside comprehensive analyses of fracture surfaces and interfacial morphologies.The findings indicated that continuous groove textures significantly improved wettability in comparison to discrete unit textures.Notably,joints with continuous grid-like texturing exhibited complete resin infiltration and achieved the highest bonding strength of 18.26 MPa.This enhancement is primarily attributed to the continuous groove structures,which facilitate unobstructed resin flow and promote the effective extrusion of carbon fibers.A novel reinforcement strategy for metal/CFRTP joints is proposed,wherein interfacial texture design is used to regulate temperature distribution and resin flow dynamics during welding.These results offer critical insights into the optimization of metal/CFRTP joint design and manufacturing processes for advanced structural applications.展开更多
Leveraging surface texturing to realize significant friction reduction at contact interfaces has emerged as a preferred technique among tribology experts,boosting tribological energy efficiency and sustainability.This...Leveraging surface texturing to realize significant friction reduction at contact interfaces has emerged as a preferred technique among tribology experts,boosting tribological energy efficiency and sustainability.This review systematically demonstrates optimization strategies,advanced manufacturing methods,typical applications,and outlooks of technical challenges toward surface texturing for friction reduction.Firstly,the lubricated contact models of microtextures are introduced.Then,we provide a framework of state-of-the-art research on synergistic friction optimization strategies of microtexture structures,surface treatments,liquid lubricants,and external energy fields.A comparative analysis evaluates the strengths and weaknesses of manufacturing techniques commonly employed for microtextured surfaces.The latest research advancements in microtextures in different application scenarios are highlighted.Finally,the challenges and directions of future research on surface texturing technology are briefly addressed.This review aims to elaborate on the worldwide progress in the optimization,manufacturing,and application of microtexture-enabled friction reduction technologies to promote their practical utilizations.展开更多
While laser surface texturing(LST)is a promising manufacturing technique for surface functionalization,simultaneously realizing high precision and high efficiency in the LST of complex curved surface is challenging,du...While laser surface texturing(LST)is a promising manufacturing technique for surface functionalization,simultaneously realizing high precision and high efficiency in the LST of complex curved surface is challenging,due to continuously varied geometries of laser-matter incidence.In the present work,we propose a novel manufacturing system of 7-axis on-the-fly LST for complex curved surface,based on the integrated synchronization of 5-axis linkage motion platform with 2-axis galvanometer.Specifically,the algorithm for decomposing spatial texture trajectory on curved surface into low-frequency and high-frequency parts is established,based on which the kinematic model of synchronized 7-axis system is developed to derive the motion of each axis in both 5-axis linkage motion platform and 2-axis galvanometer simultaneously.Subsequently,the synchronized 7-axis LST system is experimentally realized,including the setup of mechanical stages integrated with optical path,the configuration of numerical control unit,and the development of processing software.Finally,case study of 7-axis on-the-fly LST of freeform aluminum surface is performed,and the advantages in terms of processing efficiency and texturing accuracy over 5-axis linkage LST are demonstrated.The correlation of reduced following errors between mechanical stages with the promoted performance of curved surface texturing by the 7-axis on-the-fly LST is further analyzed.Current work provides a feasible solution for establishing the manufacturing system for high performance LST of complex curved surface.展开更多
The Textile Technology Centre is the pride of Heberlein.State-of-the-art equipment and a team of top experts guarantee the highest standards of support for customers.Heberlein is the leading provider of air interlacin...The Textile Technology Centre is the pride of Heberlein.State-of-the-art equipment and a team of top experts guarantee the highest standards of support for customers.Heberlein is the leading provider of air interlacing and air texturing jets for synthetic continuous filament yarns and its clients enjoy added value in the form of practical help and guidance on textile processes and economic issues,with a special focus on filament yarn applications.展开更多
针对弱纹理和变光照环境下基于点特征的视觉SLAM(simultaneous localization and mapping)算法轨迹漂移的问题,提出了一种基于改进自适应阈值ELSED算法(Adaptive-ELSED)的快速点线融合双目视觉SLAM算法。通过在ELSED算法中添加自适应阈...针对弱纹理和变光照环境下基于点特征的视觉SLAM(simultaneous localization and mapping)算法轨迹漂移的问题,提出了一种基于改进自适应阈值ELSED算法(Adaptive-ELSED)的快速点线融合双目视觉SLAM算法。通过在ELSED算法中添加自适应阈值矩阵,动态调整不同光照条件下梯度阈值,并使用长度抑制和短线合并策略,提高线特征的质量。利用基于双目几何约束和图像结构相似性(SSIM)进行快速线段特征三角化。基于历史位姿及误差分析获取初始位姿,通过自适应因子实现光束法平差过程中点线特征的更有效融合。实验结果表明,所提算法在提高线特征质量的同时,耗时仅为LSD算法的50%,线特征匹配速度较传统LBD算法提升67%,挑战性场景下轨迹误差较ORB-SLAM3降低62.2%,系统的平均跟踪帧率为27帧/s,在保证系统实时性的同时,显著提升了系统在弱纹理、变光照环境下的精度和鲁棒性。展开更多
文摘The original online version of this article was revised:Several errors occurred in the published version of the article.These have now been corrected as follows:Page 2,section"2.2 Laser Texturing Procedure of Surfaces",line 2:The device name was corrected from"YDFLP-E-50-M8"to"YDFLP-50-M8."Page 3,Section 2.4:The phrase"95%confidence interval"has been corrected to"95%confidence level."Page 3,Figure 1 caption:The phrase"fandg"has been corrected to"f and g."The order"C4 and C12"has been reversed to"C12 and C4,"in accordance with the display order in the figure.Page 4,Figure reference:The phrase"Figs.4c and d"has been corrected to"Figs.5b and c."Page 5,paragraph starting with"The ANOVA results are presented...":The phrase"95%confidence interval"has been corrected to"95%confidence level."
基金co-supported by the National Natural Science Foundation of China(No.52275360)。
文摘The joining of Fe Cr Al alloy and Carbon Fiber Reinforced Thermoplastic Composites(CFRTP)presents a promising strategy for the development of lightweight and structurally reliable components.In this study,ultrasonic welding,noted for its efficiency and environmentally sustainable characteristics,was employed to examine systematically examine the impact of surface texturing on joint performance.Two distinct categories of Fe Cr Al surface textures,discrete unit patterns and continuous groove structures,were created and subsequently welded with Short Carbon Fiber Reinforced Polyamide 6(SCFR-PA6).The wettability of molten SCFR-PA6 on the textured surfaces and the bonding strength of the resulting joints were evaluated,alongside comprehensive analyses of fracture surfaces and interfacial morphologies.The findings indicated that continuous groove textures significantly improved wettability in comparison to discrete unit textures.Notably,joints with continuous grid-like texturing exhibited complete resin infiltration and achieved the highest bonding strength of 18.26 MPa.This enhancement is primarily attributed to the continuous groove structures,which facilitate unobstructed resin flow and promote the effective extrusion of carbon fibers.A novel reinforcement strategy for metal/CFRTP joints is proposed,wherein interfacial texture design is used to regulate temperature distribution and resin flow dynamics during welding.These results offer critical insights into the optimization of metal/CFRTP joint design and manufacturing processes for advanced structural applications.
基金the National Natural Science Foundation of China(Award No.07120016)support by the Dalian University of Technology(DUT)(Award Nos.82232022,82232043,and DUT22LAB404)AVIC Shenyang Aircraft Company(Award No.12020641 and 12020642)。
文摘Leveraging surface texturing to realize significant friction reduction at contact interfaces has emerged as a preferred technique among tribology experts,boosting tribological energy efficiency and sustainability.This review systematically demonstrates optimization strategies,advanced manufacturing methods,typical applications,and outlooks of technical challenges toward surface texturing for friction reduction.Firstly,the lubricated contact models of microtextures are introduced.Then,we provide a framework of state-of-the-art research on synergistic friction optimization strategies of microtexture structures,surface treatments,liquid lubricants,and external energy fields.A comparative analysis evaluates the strengths and weaknesses of manufacturing techniques commonly employed for microtextured surfaces.The latest research advancements in microtextures in different application scenarios are highlighted.Finally,the challenges and directions of future research on surface texturing technology are briefly addressed.This review aims to elaborate on the worldwide progress in the optimization,manufacturing,and application of microtexture-enabled friction reduction technologies to promote their practical utilizations.
基金the support by the Harbin Manufacturing Science and Technology Innovation Talent Project(No.2023CXRCGD035)the Open Research Foundation of State Key Laboratory of Digital Manufacturing Equipment and Technology in Huazhong University of Science and Technology,China(No.IMETKF2023012).
文摘While laser surface texturing(LST)is a promising manufacturing technique for surface functionalization,simultaneously realizing high precision and high efficiency in the LST of complex curved surface is challenging,due to continuously varied geometries of laser-matter incidence.In the present work,we propose a novel manufacturing system of 7-axis on-the-fly LST for complex curved surface,based on the integrated synchronization of 5-axis linkage motion platform with 2-axis galvanometer.Specifically,the algorithm for decomposing spatial texture trajectory on curved surface into low-frequency and high-frequency parts is established,based on which the kinematic model of synchronized 7-axis system is developed to derive the motion of each axis in both 5-axis linkage motion platform and 2-axis galvanometer simultaneously.Subsequently,the synchronized 7-axis LST system is experimentally realized,including the setup of mechanical stages integrated with optical path,the configuration of numerical control unit,and the development of processing software.Finally,case study of 7-axis on-the-fly LST of freeform aluminum surface is performed,and the advantages in terms of processing efficiency and texturing accuracy over 5-axis linkage LST are demonstrated.The correlation of reduced following errors between mechanical stages with the promoted performance of curved surface texturing by the 7-axis on-the-fly LST is further analyzed.Current work provides a feasible solution for establishing the manufacturing system for high performance LST of complex curved surface.
文摘The Textile Technology Centre is the pride of Heberlein.State-of-the-art equipment and a team of top experts guarantee the highest standards of support for customers.Heberlein is the leading provider of air interlacing and air texturing jets for synthetic continuous filament yarns and its clients enjoy added value in the form of practical help and guidance on textile processes and economic issues,with a special focus on filament yarn applications.
文摘针对弱纹理和变光照环境下基于点特征的视觉SLAM(simultaneous localization and mapping)算法轨迹漂移的问题,提出了一种基于改进自适应阈值ELSED算法(Adaptive-ELSED)的快速点线融合双目视觉SLAM算法。通过在ELSED算法中添加自适应阈值矩阵,动态调整不同光照条件下梯度阈值,并使用长度抑制和短线合并策略,提高线特征的质量。利用基于双目几何约束和图像结构相似性(SSIM)进行快速线段特征三角化。基于历史位姿及误差分析获取初始位姿,通过自适应因子实现光束法平差过程中点线特征的更有效融合。实验结果表明,所提算法在提高线特征质量的同时,耗时仅为LSD算法的50%,线特征匹配速度较传统LBD算法提升67%,挑战性场景下轨迹误差较ORB-SLAM3降低62.2%,系统的平均跟踪帧率为27帧/s,在保证系统实时性的同时,显著提升了系统在弱纹理、变光照环境下的精度和鲁棒性。
