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  • Intelligent  Manufacturing——Main 　Direction  of "Made  in  China 2025"
    Zhou Ji
    China Mechanical Engineering. 2015, 26(17): 2273-2284.
    Abstract (824) Download PDF (8405)   Knowledge map   Save

    How to transform from a big nation in manufacturing  to  a  powerful one is a great subject of China's  economic development in the new era.This paper discussed  the guiding ideology,strategic deployment,basic policy and strategic measure of “made in China 2025” based on detailed analyses of current manufacturing situations  of China,and indicated  that “Internet+advanced manufacturing+modern service industry” will become a new engine of China's economic development.It  is pointed  out that digitization,networking and  intellectualization of manufacturing industries  are the core technologies of  a new round industrial revolution, and should be used as commanding point,breakthrough and main direction of  “made in China 2025”.An overall thorough interpretation of above points was put forward.

  • 唐堂, 滕琳, 吴杰, 陈明
    China Mechanical Engineering. 2018, 29(03): 366-377.
    Abstract (511) Download PDF (8323)   Knowledge map   Save
  • Additive Manufacturing-Current Situation and Future
    LU Bingheng
    China Mechanical Engineering. 2020, 31(1): 19-23. https://doi.org/10.3969/j.issn.1004-132X.2020.01.003
    Abstract (1837) Download PDF (5924)   Knowledge map   Save
    The up-to-date progress in the additive manufacturing technology has been fully reviewed in this article, and the associated opportunity & challenges were also discussed. It has been proposed that the future directions of the additive manufacturing technology should be focused on the nonequilibrium solidification of the metal printing, the novel theory development of manufacturing under extreme conditions, additive manufacturing of materials & structure in-gradient, the regeneration and functionalization of the engineered scaffolds, theory of life science etc. Constructive ideas should be encouraged, to be led by technical progress, to be driven by technological innovation, and to be targeted by the industrial development, aiming to provide the solid foundation for the innovative national construction.
  • Study on Architecture of Intelligent Manufacturing Theory
    LIU Qiang
    China Mechanical Engineering. 2020, 31(1): 24-36. https://doi.org/10.3969/j.issn.1004-132X.2020.01.004
    Abstract (1289) Download PDF (4112)   Knowledge map   Save
    The connotation and features of the intelligent manufacturing were analyzed based on reviewing the development and challenges to the manufacturing technology. A new understanding to the intelligent manufacturing at the era of industry 4.0 was proposed, followed by a suggested overall architecture of the intelligent manufacturing theory. The architecture included 8 modules such as theoretical fundamentals, technological fundamentals, supporting technologies, enabling technologies, kernel and themes, development paradigms, technological road-map and objective, etc. The concrete contents were set forth to the several issues of the modules above respectively, with the fundamental rules and technological phases to promote and practice the intelligent manufacturing. Finally, the future factory and manufacturing were discussed prospectively.
  • Finite Element Mesh Generation and Decision Criteria of Mesh Quality
    LI Hai-Feng-1, TUN Ji-Chuan-2, LIU Jian-Bei-1, LIANG Yu-Bing-1
    China Mechanical Engineering. 2012, 23(3): 368-377.
    Abstract (425) Download PDF (4000)   Knowledge map   Save
    Some general problems in mesh generation were discussed, the demands of mesh generation were expounded, the mesh generation methods were introduced, the mesh generation algorithms in last ten years were retrospected and their advantages and disadvantages were compared. Based on the requirements of practical engineering calculation,the authors brought up the mesh quality demands and decision index, explored the mesh quality optimization, introduced the preprocessors and their applications of the commercial softwares,then gave out several practical examples of the mesh generation. At last, the trends of mesh generation were also presented.
  • An Overview and Recent Research Progresses of Vertical Axis Wind Turbine
    YANG Yi-Fei, BO Wei, SHU Huang-Qiu
    China Mechanical Engineering. 2013, 24(5): 703-709.
    Abstract (324) Download PDF (3718)   Knowledge map   Save

    This paper formulated several main types of vertical axis wind turbine and their characteristics, operation principles and applications were discussed. The improvement on performance in improving wind power coefficient and the latest development of the main key part were presented. The viewpoints are that vertical axis wind turbine will be the development tendency of wind power. Finally, the conclusion gives a simple view of problems that need further study on the basis of the shortage of the vertical axis wind turbine.

  • Brief Analysis of a BigDog Quadruped Robot
    DING Liang-Hong, WANG Run-Xiao, FENG Hua-Shan, LI Jun
    China Mechanical Engineering. 2012, 23(5): 505-514.
    Abstract (443) Download PDF (3537)   Knowledge map   Save
    Based on the current technical information of a BigDog quadruped robot which was released, the overall profile and the core technology of the BigDog robot were analyzed herein. Structural characteristics, motion characteristics and high power density issues arising from these were analyzed emphatically in the mechanical system. The basic components of the BigDog's hydraulic drive system were analyzed briefly. Biomimetic structure defects restricted the BigDog's maneuverability to further promotion. In rough terrain, the motion control of BigDog firstly depends on the detection of body posture and perception of the terrain. Security posture is the prerequisite for BgDog's continuous longitudinal motion. The basic walking control algorithm was analyzed briefly. The output characteristics of the hydraulic system just meet BigDog's dynamic requirements. Control implementation process was known by analyzing several typical states of motion. Navigation system of BigDog, in particular fully autonomous navigation part is the emphasis. In unstructured environments, the intelligence of mobile robot mainly depends on the design of navigation system. At last, based on author's research experience on quadruped robot, some suggestions of the research and development on the quadruped robot were proposed.
  • Research Status and Development Tendency of Wind Turbine Reliability
    LI Yao1;ZHU Caichao1;TAO Youchuan2;SONG Chaosheng1;TAN Jianjun1
    China Mechanical Engineering. 2017, 28(09): 1125-1133.
    Abstract (439) Download PDF (3470)   Knowledge map   Save
    The failure modes and research progresses of reliability for wind turbines at home and broad were analyzed. The failure modes, failure reasons and detection methods of key components in the wind turbines were summarized. Also, the frequently used methods of reliability analysis and research status of wind turbine reliability were analyzed. Then research focuses, research methods and measures to improve wind turbine reliability were presented. Combining with the engineering requirements and research status, the development tendency of wind turbine reliability was analyzed and the flowchart to investigate the smart health management technology of wind turbines was proposed. It is of great significance to reduce the costs of operations and maintenances and to improve the safety of wind turbines.
  • A Mixed Integer Programming Model for Advanced Planning and Scheduling in a Supply Chain
    CHEN Ge-Jia, XIE Shu-Ting
    China Mechanical Engineering. 2012, 23(14): 1688-1692.
    Abstract (172) Download PDF (2870)   Knowledge map   Save

    This paper presented a  mixed integer programming model for APS problem in a supply chain.The proposed APS model considered explicitly capacity constraints,operation sequences,alternative machines and due dates in a multi-enterprise environment.The objective of the model was to minimize the earliness/tardiness penalty for all orders.Numerical results show that the suggested APS model can produce optimal schedules favorably.

  • New Progresses on Magnetorheological Finishing(MRF) Technology
    CHEN Feng-Jun, YIN Shao-Hui, TU Jian-Wu, XU Zhi-Jiang
    China Mechanical Engineering. 2011, 22(19): 2382-2392.
    Abstract (313) Download PDF (2776)   Knowledge map   Save
    The latest progresses on development and research of MRF in recent years were introduced. The machining mechanism, small and large processing machines and related equipment, machining technology and processing experiment, processing algorithm and model, development technology of magnetorheological fluid were summarized and analyzed in details. Some key technologies and the problems of MRF were discussed, and the future research direction was prospected.
  • Development of Coating of Photoresist in Semiconductor Manufacturing
    XIANG Dong-1, HE Lei-Meng-1, JI De-Gang-1, 2, MAO Feng-1, DUAN An-Hong-1
    China Mechanical Engineering. 2012, 23(3): 354-361.
    Abstract (273) Download PDF (2711)   Knowledge map   Save
    The quality of the coating of the photoresist impacts the quality of lithography directly. The spin coating and spray coating method and their development process were presented, as well as the electrodeposition(ED), vapor deposition methods. Advantage and disadvantages of the spin coating, spray coating and ED were outlined, and the applications of the different coating methods were summarized.
  • Reliability Test Technology of Mechanical Products-Overview and Prospect
    CHEN Wenhua, HE Qingchuan, PAN Jun, QIAN Ping, ZHONG Liqiang
    China Mechanical Engineering. 2020, 31(1): 72-82. https://doi.org/10.3969/j.issn.1004-132X.2020.01.008
    Abstract (525) Download PDF (2694)   Knowledge map   Save
    An overview of the development of reliability engineering was provide, and the recent developments of reliability test and problems with reliability test of mechanical products were summarized. The developments of methods on how to conduct statistical analysis and design test plan of accelerated life test and accelerated degradation test were reviewed, and also the developments of high accelerated life test and high accelerated stress screening test were reviewed. The development prospect of reliability test technology of mechanical products was presented and the guidelines were provided to promote the engineering applications of reliability test theory and methods.
  • Overview of Aviation Hydraulic Fittings
    Ouyang Xiaoping1;Fang Xu1;Zhu Ying2;Wang Kai3;Yang Huayong1
    China Mechanical Engineering. 2015, 26(16): 2262-2271.
    Abstract (336) Download PDF (2678)   Knowledge map   Save

    The  aviation  hydraulic fitting is one of the most important components which directly affects  the safety and reliability of aircrafts.A comprehensive overview was intended to introduce the general features of the aviation hydraulic fittings.The performance of three main types of aviation hydraulic fittings was demonstrated, including permanent fittings,separable fittings and boss fittings.The structure,principles,applications,design standards and suppliers of each type were illustrated.The characteristics of each main type fitting such as pressure resistance,pull-off  strength,weight  and  installation,were  analyzed and compared.The recommended selections of aviation hydraulic fittings for different pressure levels were summarized.Finally,the developing prospect of aviation hydraulic fittings was given, and the large distance in the aviation hydraulic fittings between China and the international advanced level was pointed out.

  • Research Status and Development Trends of Large Wind Turbine Main Shaft Sliding Bearings
    ZHU Caichao1, ZHANG Ronghua1, SONG Chaoshen1, TAN Jianjun1, YANG Liang2
    China Mechanical Engineering. 2024, 35(10): 1711-1721. https://doi.org/10.3969/j.issn.1004-132X.2024.10.001
    Abstract (424) Download PDF (2657)   Knowledge map   Save
    The pace of large wind turbine units was accelerating, and the reliability of core components was increasingly important for wind turbine operations. Sliding bearings had the advantages of high load capacity, long life, easy maintenance, scalability and small size, and they had advantages and great potential for the reliable replacement of wind turbine main bearings key components produced at home. The problems of main shaft rolling bearings in high-power wind turbines and the advantages of using sliding bearings on the main shaft were analyzed herein. The technical methods and application status of wind turbine main shaft sliding bearing design, materials, lubrication, and experimental verification were present in detail, and the existing problems of high-power wind turbine main shaft sliding bearings and future development trends were summarized. It is expected to provide reference for the digital design and industrial development of high-power wind turbine main bearings.
  • Theoretical Difficulties and Research Progresses of Mechanism Reconfiguration in Mechanisms—Evolution Connotation, Furcation Principle, Design Synthesis and Application of Metamorphic Mechanisms
    KANG Xi, DAI Jiansheng
    China Mechanical Engineering. 2020, 31(1): 57-71. https://doi.org/10.3969/j.issn.1004-132X.2020.01.007
    Abstract (630) Download PDF (2557)   Knowledge map   Save
    The development of productivity and the innovation of engineering technology required mechanisms to have the multi-function of self-reorganization and reconfiguration to meet the needs of complex working conditions. Reconfigurable mechanisms had variable mobility and varying configurations to meet the requirements of multiple tasks, multiple working conditions and multiple functions. However, the research history of mechanism evolution and furcation principle, which determined the design method, was still not fully understood by scholars. Herein, from the point of view of the evolution and furcation principle of metamorphic mechanisms, based on screw theory, Lie group, Lie algebra and differential manifold, the mechanism evolution and the interrelationship between the mechanism motions and the constraint spaces were revealed. Then, the furcation principle and the controllable singularity configuration in the evolution of the mechanism were explored. Moreover, the historical relationship between metamorphic mechanisms, origami mechanisms and deployable mechanisms was discussed, and the configuration design, performance synthesis, new design concept of metamorphic mechanisms and their innovative application were reviewed.
  • Optimization of Hall Position Sensor for Permanent Magnet Synchronous Linear Motors
    LI Bingran1;ZHANG Hui1,2;YE Peiqing1,2,3
    China Mechanical Engineering. 2017, 28(24): 2913-2918.
    Abstract (722) Download PDF (2465)   Knowledge map   Save
    There was a way to detect the positions of linear motors by detecting the magnetic field informations of linear motor movers. The principle of double Hall sensor position detection was introduced, and the cause of the installation errors was analyzed herein. In order to achieve the Hall sensor position detection error compensation, a method of using a 3D Hall sensor was proposed instead of a linear Hall sensor. In order to reduce external interferences, a fuzzy-neural off-line modeling method was proposed. Finally, the correctness of the compensation method was verified through the simulations and experiments.
  • Big Data Driven Intelligent Manufacturing
    ZHANG Jie, WANG Junliang, LYU Youlong, BAO Jinsong
    China Mechanical Engineering. 2019, 30(2): 127-133,158. https://doi.org/10.3969/j.issn.1004-132X.2019.02.001
    Abstract (618) Download PDF (2391)   Knowledge map   Save
    The industrial big data analytics is one of the most critical issues to enable the intelligent manufacturing.According to "the fourth paradigm:data-intensive scientific discovery", the "connection-prediction-regulation" scientific paradigm of big data-driven intelligent manufacturing was proposed.According to the data processing processes, the method system of fusion processing, correlation analysis, performance prediction and optimization decision was summarized.The big data platform was designed around the edge layer, platform layer and application layer, and the enabling technology of big data-driven intelligent manufacturing was introduced. Then four typical application scenarios were illustrated and reviewed:design, planning and scheduling, quality optimization, and machinery health management.
  • Impact Dynamics Modeling and Simulation Analyses of Pneumatic Cylinders
    Du Qungui;Sun Zhiquan;Huang Chongxi;Zhai Xiaochen
    China Mechanical Engineering. 2016, 27(08): 1053-1058.
    Abstract (332) Download PDF (2233)   Knowledge map   Save
    Impact of pneumatic cylinder at the stroke terminal was considered to be an integrated system of vibrations, including slender piston rod, mass load, piston and end cover.Based on one-dimensional wave equation, a mathematical model of longitudinal   vibration of slender piston rod was established firstly. Impact force,contact displacement and  contact time were analyzed by means of mode superposition method.Then impact process of pneumatic cylinder was numerically simulated by nonlinear FEM software LS-DYNA.The variation of impact interface force and contact time were studied in detail under different masses of driven load and impact velocities. Compared with numerical solution of LS-DYNA,the accuracy of analytical solution was verified, and how impact force varies as velocity and load was concluded. Vibration frequencies of impact response were furtherly analyzed, and reasons for the changes of impact forces were studied. Research conclusions provide reference for design and applications of pneumatic cylinders.
  • Discussion of Low Cycle Fatigue Life Prediction Models for Magnesium Alloys
    CHEN Ling1, 2;ZHANG Xianming1;LIU Fei2;OUYANG Ping1;JIA Yanyan3
    China Mechanical Engineering. 2017, 28(05): 512-518.
    Abstract (531) Download PDF (2233)   Knowledge map   Save
    Through low cycle fatigue experiments of the cast magnesium alloy AZ91D and the wrought magnesium alloy AZ31B at room temperature under stress control, the fatigue life prediction was conducted by the Basquin model, the SWT model and the strain energy-life model. Then, regarding the low cycle fatigue damage of magnesium alloys as an irreversible dissipation process that might be described by the entropy according to the irreversible thermodynamics theory of continuum damage mechanics, and using the mean strain increment per cycle to reflect the effects of the mean stress, a new model for the low cycle fatigue life prediction of magnesium alloys was developed. By this model, the low cycle fatigue life prediction of magnesium alloys was carried out through the experiments mentioned above. Results show that the predicted results are in good agreement with the experimental results. And compared with the other life prediction models, the new model for the low cycle fatigue life prediction of magnesium alloys has a better effectiveness.
  • Human Factor Engineering for Human-Cyber-Physical System Collaboration in Intelligent Manufacturing
    YANG Xiaonan, FANG Haonan, LI Jianguo, XUE Qing
    China Mechanical Engineering. 2023, 34(14): 1710-1722,1740. https://doi.org/10.3969/j.issn.1004-132X.2023.14.008
    Abstract (194) Download PDF (2228)   Knowledge map   Save
    The theoretical system of intelligent manufacturing for HCPS confirmed the central position of human in the intelligent manufacturing system. Starting from the demand of human-machine collaboration in the intelligent manufacturing system, the emphases of human factors in HCIM were discussed from three levels such as behavior, intention, and cognition, based on the theory of gulf. Focusing on virtual-real fusion scenarios, multimodal human-machine interaction, cognitive quantification and other methods, the importance of human factor engineering in promoting the integration of human-computer intelligence was expounded. Finally, research direction and development suggestions of human-centered intelligent manufacturing from the implementation of HCPS intelligent manufacturing systems were put forward.
  • Review for Research of Fatigue Life Prediction of Welded Structures under Complex Loads and Extreme Environments
    DONG Zhibo1, WANG Chengcheng1, LI Chengkun1, LI Junchen2, ZHAO Yaobang2, LI Wukai2, XU Aijie2
    China Mechanical Engineering. 2024, 35(05): 829-839. https://doi.org/10.3969/j.issn.1004-132X.2024.05.008
    Abstract (190) Download PDF (2195)   Knowledge map   Save
    The welded joints were susceptible to defects and stress concentration, rendering them vulnerable areas for fatigue crack initiation and propagation under fatigue loads. In comparison to homogeneous materials, the microstructure and stress localization in each of regions for the joints further complicated the fatigue issue in welded structures. Unlike ideal experimental conditions, the actual service environments of welded structures were intricate, it was necessity to consider the coupling characteristics between environmental factors and welded structures when predicting welded structure fatigue life. Therefore, the internal factors influencing welded structures were summarized and analyzed while reviewing existing life prediction models from perspectives encompassing complex loads and extreme service environment. Combining the latest research progresses, the recommendations were proposed to enhance fatigue life assessment methods for the welded structures.
  • Design for Basic Rack of Harmonic Drive with Double-circular-arc Tooth Profile
    XIN Hong-Bing
    China Mechanical Engineering. 2011, 22(6): 656-662.
    Abstract (307) Download PDF (2159)   Knowledge map   Save
    On the basis of research on engagement principle of harmonic drive with circular-arc tooth profile, a design method was presented for double circular-arc tooth profile of basic rack for flexspline and rigid spline of harmonic drive. The double circular-arc tooth profiles of basic rack ensured the tooth profiles of flexspline and rigid spline to keep on conjugating with each other during the meshing period, especially there existed so-called dual-conjugated meshing zones, in which the convex and concave profiles of flexspline conjugated with the concave and convex profiles of rigid spline simutaneously, this characteristics played important roles in improving the torsional stiffness and transmission accuracy of the harmonic drive. The double-circular-arc tooth profiles of basic rack of harmonic drive with elliptical wave generator were developed and applied in design and manufacture of the hobs with double-circular-arc tooth profile for flexspline, the shaping cutters with double-circular-arc tooth profile for rigid spline and the sample device for experimentation. Compared with the involute profile, the flexible strength, transmission accuracy, and torsional stiffness of the harmonic drive with double-circular-arc tooth profiles are markedly improved. 
  • J4. 2012, 23(24): 3025.
    Abstract (95) Download PDF (2060)   Knowledge map   Save
  • Singularity Analysis of Single Degree-of-freedom Complex Planar Linkages
    WANG Jun1;NIU Kejia1;NIE Liangyi2;HE Hongxiu1;CHEN Zhilong1;WANG Quan1;REN Jun1
    China Mechanical Engineering. 2018, 29(01): 36-40.
    Abstract (563) Download PDF (2042)   Knowledge map   Save
    The singularity of complex planar linkages was very difficult to find because they consisted of multiple links and more complex loops and input-related. Using the concept of instance center and the characteristics of planar linkages, the concept and method of equivalent four-bar linkages for the singularity analysis of single-DOF complex planar linkages were proposed. The geometric characteristics were employed when the equivalent linkage was at dead point positions. The proposed method is geometry-based and may be applied to the singularity analysis of more complex linkages such as the double butterfly linkages.
  • Mammalian Legged Robot:a Review
    QIN Xian-Sheng-1, 2, ZHANG Xue-Feng-1, TAN Xiao-Qun-1, FENG Hua-Shan-1, ZHANG Pei-Pei-1
    China Mechanical Engineering. 2013, 24(6): 841-851.
    Abstract (242) Download PDF (2040)   Knowledge map   Save

    For discrete ground contact,there were high adaptability and extensive application prospect for mammalian legged robot when encountering special topographical and unpredictable environment such
    as obstacles,ditch and so on.This paper surveyed the development process of mammalian legged robots,and mainly introduced overseas and domestic research status in terms of two legged and four legged robots.The related theory and method on legged structure,joint drive,navigation,stability criterion and control algorithm  were analyzed and discussed,Meanwhile,the difficulties to be solved under development were analyzed and the future of legged robots was forecasted.

  • Research on Accelerated Life Test Method of Harmonic Reducers
    WANG Qiao, DU Xuesong, SONG Chaosheng, ZHU Caichao, SUN Jianquan, LIAO Delin
    China Mechanical Engineering. 2022, 33(19): 2317-2324. https://doi.org/10.3969/j.issn.1004-132X.2022.19.005
    Abstract (360) Download PDF (2020)   Knowledge map   Save
    At present， there was an urgent need for an accelerated life test method of harmonic reducer in engineering to replace the full life test in order to reduce the test cycles and costs. Based on the principles of accelerated life test， a constant stress accelerated life test program  was proposed based on the failure characteristics of the harmonic reducer. The flexible wheel that was most likely to fail in the harmonic reducers was taken as the object， and the definite failure judgment， acceleration stress， acceleration factor， method of accelerating model were pointed out. In the small sample test data processing， a more accurate Weibull distribution parameter estimation was obtained by using the maximum likelihood method and Markov Monte Carlo method. The experimental results of the prototype show that the scheme may effectively describe the life of the harmonic reducers. The reliability evaluation standard of the basic rated life is 62% higher than that of the evaluation standard of the median life. The life index of the harmonic reducers was effectively evaluated. The research results have certain engineering application values. 
  • Research Progresses on Surface Integrity of Bearing Grooves
    WANG Dongfeng, YUAN Julong, WANG Yanshuang, CHENG Yongjie, LYU Binghai
    China Mechanical Engineering. 2022, 33(18): 2143-2160. https://doi.org/10.3969/j.issn.1004-132X.2022.18.001
    Abstract (472) Download PDF (1982)   Knowledge map   Save
    Improving the surface integrity of bearing grooves was an important solution to solve technical problems such as low reliability life, high friction power consumption and unstable vibrations and noises of bearings. On the basis of comprehensive research of generalized surface integrity by domestic and foreign scholars, the definition and connotation of characteristic parameters of bearing groove surface integrity were proposed, and the significance of characteristic parameters and the influence mechanism on bearing performance were expounded. The influences of different processing processes such as forging, turning, heat treatment, grinding and ultra-precision on the surface characteristic parameters of bearing raceways were analyzed in details, and the corresponding control measures were given. The new technologies, new processes, and new methods for improving surface integrity were briefly introduced. Finally, the summary and prospect of improving the surface integrity of bearing grooves were made to provide some references for improving the contact fatigue lifes of bearings.
  • Development Trends of High-end NC Equipment
    WANG Ta-Yong-1, JIAO Zhi-Feng-1, HAN Zhi-Guo-2, DONG Jing-Chuan-1, QI Jin-Zhang-1
    China Mechanical Engineering. 2011, 22(10): 1247-1252,1259.
    Abstract (146) Download PDF (1979)   Knowledge map   Save
    This paper introduced the key technology’s development trend of a modern high grade NC equipment. Firstly, according with the development of the key functional units in a machine tool,the paper discussed the mainstream development of the NC machine tool in the aspect of high speed,high precision,high efficiency and high reliability, and further pointed out the reliability of machine tool was the key factor that affected the market competitiveness of China machine tool companies. Secondly, with the continuous development of high-grade NC system in intelligence, open, networking and other aspects, the future development direction and important impact on the CNC technology of the latest digital control technology were described and the latest research results both at home and abroad were also introduced. Finally, combining with the current development situation of domestic NC industry, the relevant individual recommendations about the development of high-grade digital equipment were proposed.
  • Review on Rolling Bearing Axial Preloaded Technique of Motorized Spindles
    LIU Zhifeng, SUN Haiming
    China Mechanical Engineering. 2018, 29(14): 1711-1723,1763. https://doi.org/10.3969/j.issn.1004-132X.2018.14.11
    Abstract (538) Download PDF (1886)   Knowledge map   Save
    Firstly,this paper gave an overview of the application status of the angular contact ball bearings in motorized spindles and analysed the interrelationship between the preloading forces and the performance such as precision,spindle speed,service life of motorized spindles. Second,were the princi-ples and characteristics of the bearing positioning preloading technology and the constant pressure pre-loading technology reviewed. Then the adjusting preload technology and the automatic preload technolo-gy were commented with different preloading methods respectively,such as hydraulic preload equip-ment,shape memory alloy(SMA)spring,double metal sleeve,piezoelectric equipment,electromagnet-ic force equipment and centrifugal force equipment etc.. Finally,the future development trends of motor-ized spindle preloading technology was prospected.
  • Research on Reverse Logistics Model and Network for Used Electric Vehicle Batteries
    ZHU Lingyun, CHEN Ming
    China Mechanical Engineering. 2019, 30(15): 1828-1836. https://doi.org/10.3969/j.issn.1004-132X.2019.15.009
    Abstract (399) Download PDF (1877)   Knowledge map   Save
    A study on the reverse logistics model and network of the used electric vehicle(EV) batteries which were from Shanghai Automotive Industry Corporation(SAIC) Group's EVs was carried out. The fuzzy comprehensive evaluation method was employed to establish the analytic model and indicator system for the choices of reverse logistics model and network building. The results indicate that the self-operated option is totally the most suitable model for SAIC Group's battery recycling. In terms of specific indicator systems, the self-operated model has outstanding advantages in economy and management factors, and the outsourcing model has obvious superiorities in technology factors. Finally, in accordance with the advantages and characteristics of the models, a self-operated model-based composite recycling network for SAIC Group's battery recycling was established with the analysis of stakeholders and the reverse logistics processes.
  • Status and Development Trend of Domestic Heavy-duty CNC Machine Tools
    GUI Lin;LI Sheng
    China Mechanical Engineering. 2020, 31(23): 2780-2787,2797. https://doi.org/10.3969/j.issn.1004-132X.2020.23.002
    Abstract (366) Download PDF (1873)   Knowledge map   Save
    Heavy-duty CNC machine tools were the machine tools for overweight and oversized components in energy, transportation industries and so on, which restricted the development of these industries. Combining the challenges of the design and manufacture of heavy-duty CNC machine tools in China, the technological breakthroughs and innovations of heavy-duty CNC machine tools were introduced with the example of a CNC seven-axis five-link propeller machining heavy-duty turning and milling machine tool CKX5680. The on-service domestic heavy-duty CNC machine tools and the encountered problems in the machining prosesses were proposed.Future development trends of heavy-duty CNC machine tools were prospected.
  • On Atomic and Close-to-atomic Scale Manufacturing——Development Trend of Manufacturing Technology
    FANG Fengzhou
    China Mechanical Engineering. 2020, 31(9): 1009-1021. https://doi.org/10.3969/j.issn.1004-132X.2020.09.001
    Abstract (563) Download PDF (1872)   Knowledge map   Save
    This paper present the manufacturing development history, described three phases of advancement in, and indicated the main trend of manufacturing development, namely, ACSM, which would be of great significance in developing future technologies and high-end components manufacturing. The ACSM main issues to be explored were discussed and the relevant suggestions and measures were who provided.
  • A Review of Force Sensing Technology in Robot-assisted Laparoscopic Surgery
    ZHANG Jianxun, YAO Bin, DAI Yu, XIA Guangming,
    China Mechanical Engineering. 2021, 32(21): 2521-2531. https://doi.org/10.3969/j.issn.1004-132X.2021.21.001
    Abstract (508) Download PDF (1857)   Knowledge map   Save
    In order to promote the further research and clinical applications of force sensing technology in robot-assisted laparoscopic surgery， the research progresses were reviewed. Sensor force sensing was divided into two categories：electrical signal-based sensing and optical signal-based sensing. Some key indicators were analyzed， such as sensor position distribution on surgical instruments， mechanical structure， measurement range， measurement accuracy and electromagnetic compatibility. Sensors advantages and disadvantages were discussed. Sensorless force sensing was divided into two categories：vision-based sensing and dynamic model-based sensing. And the realization method， technical obstacle and error sources were analyzed. Finally， the development trend of force sensing technology in robot-assisted laparoscopic surgery was prospected. 
  • Evolution and Operation Mechanism of Digital Twin Shopfloors
    JIANG Haifan, DING Guofu, ZHANG Jian
    China Mechanical Engineering. 2020, 31(7): 824-832,841. https://doi.org/10.3969/j.issn.1004-132X.2020.07.008
    Abstract (770) Download PDF (1854)   Knowledge map   Save
    The evolution mechanism of the DTSs was not clear, resulting in a lack of technology roadmap for DTS in the manufacturing fields. To fill this gap, firstly the existing problems and challenges in production shopfloors were analyzed in the view of the role and relationship of information flow, material flow and control flow. Then, after summarizing the research status of digital twin, the method how to construct an interactive, controllable and computable virtual workshop was proposed from three dimensions namely visualization, logic and data. Further,evolution mechanism from virtual shopfloors to digital model shopfloors, digital shadow shopfloors and DTSs was explored. Finally, the DTS was realized from digital, intelligent and smart stages, and the operation mechanism and enabling technologies of each stage were expounded, which provides reference for the promotion and applications of DTS in the manufacturing fields.
  • Establishment of Jacobian Matrix and Singularity Analysis of a 6-DOF Installing-calibrating Robot
    LI Cheng-1, XIE Zhi-Jiang-1, NI Wei-2, LIU Nan-2
    China Mechanical Engineering. 2012, 23(10): 1165-1169,1174.
    Abstract (355) Download PDF (1844)   Knowledge map   Save

    Aimed at a 6-DOF installing-calibrating robot,coordinate systems of joints were set up and D-H parameters were obtained by using D-H methods.Then the positions of its moving elements and end-effectors with their relationship were presented and the forward kinematic solution were derived.A Jacobian matrix of  the installing-calibrating robot was established based on differential methods.And singular values of the Jacobian matrix and the condition numbers of installing-calibrating robot were analyzed.It provides the theoretical basis and important data for the robot trajectory planning and online real-time calculation under actually working environments.

  • Collaborative Optimization of Dynamic Manufacturing Production Planning and Scheduling
    WANG Yanhong, YU Ning, CAI Ming, XING Dawei
    China Mechanical Engineering. 2018, 29(22): 2767-2771. https://doi.org/10.3969/j.issn.1004-132X.2018.22.015
    Abstract (479) Download PDF (1768)   Knowledge map   Save
    Based on the idea of collaborative optimization of production planning and scheduling,a rolling optimization model of planning and scheduling was established,and a "closed-loop integration-rolling rescheduling" strategy was proposed. When the production system had dynamic changes such as capacity constraints or order changes,the scheduling and planning formed a "closed-loop response mode",and further used the dynamic constraint balancing hybrid algorithm to optimize the production planning and scheduling. In order to verify the effectiveness and feasibility of the proposed cooperative optimization strategy,a typical example was selected for simulation. The results show that the strategy may effectively deal with the dynamic changes of the production system,and ensure the timely adjustment of the system scheduling optimization.
  • Research on Hot Stamping-Joining Integrated Process Feasibility of High-strength Steel/CFRP and Sample Bending Performance
    ZHU Bin, LIU Wang, TIAN Feng, LIU Yong, ZHANG Yisheng,
    China Mechanical Engineering. 2021, 32(24): 2975-2980. https://doi.org/10.3969/j.issn.1004-132X.2021.24.010
    Abstract (314) Download PDF (1762)   Knowledge map   Save
    A joining and forming integrated process for high-strength steel/CFRP multi-material parts was developed, where the hot stamping technology was used to join the high-strength steel and CFRP prepreg. The preparation processes of multi-material composite parts under different quenching temperatures during hot stamping were studied and microscopic observation of the steel sheets was conducted. Then the three-point bending tests for the multi-material composite parts were carried out. The microscopic observation results show that the microstructure of the steel sheets is full martensite. The three-point bending tests indicate that the bending angles of the samples with no CFRP, with two layers CFRP, and with four layers CFRP are as 130°, 110° and 104°, respectively. Besides, the force-displacement curves of the bending tests were integrated to calculate the energy absorption of the samples. The results show that the energy absorption of the samples with no CFRP, with two layers CFRP, and with four layers CFRP are as 9410 J, 9692 J, and 10050 J. The energy absorption of the samples with two-layer CFRP and the samples with four-layer CFRP increase by 2.9% and 6.8% compared with the samples without CFRP.
  • Structural Design of Finger Rehabilitation Exoskeleton Robots
    WANG Jie1;GUAN Shengqi1;XIA Qixiao2
    China Mechanical Engineering. 2018, 29(02): 224-229.
    Abstract (775) Download PDF (1753)   Knowledge map   Save
    In order to meet rehabilitation needs of patients with finger injury, a finger-supported exoskeletal robot was designed based on planar linkages. Firstly, a kinematics model of the robot was established by analyzing the degrees of freedom of bionic finger movements. Secondly, main mechanical components and rotation angles of finger joints were used as space vector elements to solve robot workspace. Based on these, optimum sizes of each mechanical structures were obtained, and structural optimization designs of mechanical components were completed. Simulation results show that the robot may carry out bending and stretching movements in a certain range of angles, and may meet rehabilitation training of patients with finger injury.
  • Review on Research Status of Positioning Accuracy Reliability of Industrial Robots
    WU Jinhui1,2；TAO Yourui1,2
    China Mechanical Engineering. 2020, 31(18): 2180-2188. https://doi.org/10.3969/j.issn.1004-132X.2020.18.005
    Abstract (795) Download PDF (1722)   Knowledge map   Save
    The positioning accuracy of industrial robots seriously affected the accuracy level and quality consistency of the auxiliary manufacturing products. The positioning accuracy reliability and positioning error compensation of industrial robots became the focus of academia and industry. The development status of positioning accuracy reliability and positioning error compensation of industrial robots were analyzed and discussed. The main research methods and focus problems in this field were summarized. Finally, the development directions of this field were prospected.
  • Applications of Improved B-Spline Curves to 6R Robot Trajectory Optimization
    DONG Jiajia;WANG Taiyong;DONG Jingchuan;ZHANG Yongbin;TAO Hao
    China Mechanical Engineering. 2018, 29(02): 193-200.
    Abstract (901) Download PDF (1715)   Knowledge map   Save
    A kinematics model of robots was established firstly by D-H frame method. Based on the analyses of trajectory planning processes, an improved B-spline curve was applied to the robot joint space trajectory interpolations. Secondly, after discussing the improvement reasons and elaborating the methods of improving the B-spline curves, the speed and acceleration properties, and the implementation details of the improved B-spline curves were given. Finally, simulation experiments were carried out on MATLAB 2014a platform, and the improved method was used to realize the circular trajectory. Results show that the method may improve the smoothness of robots in joint motions and spatial trajectories, and then optimize the trajectory motions of the robots.
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