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Research Progresses of Superhydrophobic Surface Processing Technology and Abrasion Resistance HUANG Yun, HUANG Jianchao, XIAO Guijian, LIU Shuai, LIN Ouchuan, LIU Zhenyang China Mechanical Engineering    2024, 35 (01): 2-26.   DOI: 10.3969/j.issn.1004-132X.2024.01.001 Abstract （300）      PDF （50387KB）（432）       Knowledge map    Save The abrasion resistance of currently prepared superhydrophobic surfaces is generally poor, which limite the applications in various fields. Studied results found that micro-nano structure and low surface energy were the key factors to achieve superhydrophobic properties. Firstly, based on the mechanism of superhydrophobic surface, the superhydrophobic surface texture was summarized, aiming to solve the wear-prone challenge of micro-nano structures by optimizing the surface texture. Secondly, the superhydrophobic surface processing technology was summarized, and measures to reduce surface energy were analyzed in terms of cost and efficiency which might provide ideas for expanding the superhydrophobic surface processing system. Then, the means of analyzing the abrasion resistance of superhydrophobic surfaces were concluded in detail and the methods of improving the abrasion resistance of superhydrophobic surfaces were described. Finally, the future development prospects of abrasion resistant superhydrophobic surfaces was prospected, with a view to promote the large-scale applications of superhydrophobic surfaces in engineering. Reference | Related Articles | Metrics

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Intelligent  Manufacturing——Main Direction  of "Made  in  China 2025" Zhou Ji China Mechanical Engineering    2015, 26 (17): 2273-2284.   Abstract （7646）      PDF （1586KB）（24274）       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. Related Articles | Metrics

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Calculation Method of Time-varying Meshing Stiffness of Small Module Gear Transmissions HU Bo, AN Jinyun, YIN Lairong, ZHOU Changjiang China Mechanical Engineering    2024, 35 (01): 74-82.   DOI: 10.3969/j.issn.1004-132X.2024.01.007 Abstract （74）      PDF （10849KB）（171）       Knowledge map    Save Due to the small center distance, the dynamic performance of small modulus gear transmissions was very sensitive to the center distance errors. In addition, the intermediate gears were often designed to rotate at high speed on the fixed shaft, and there were clearances between the gear center hole and the shaft. Therefore, the calculation model of the gear mesh characteristic parameters and time-varying mesh stiffness under the influences of the center distance errors and the shaft hole fit clearances was established, and the influence laws of the two factors mentioned on the mesh stiffness were investigated. The results show that the center distance errors will change the contact degree and meshing stiffness of the gear pairs. The shaft hole clearance causes the actual center distance to fluctuate periodically around the theoretical center distance, which leads to the coexistence of the strengthening and weakening regions of the meshing stiffness in the whole cycle. The influences of center distance errors and shaft hole fit clearances both superimposed and weakened each other in different angle ranges, resulting in the difference in meshing stiffness of each gear tooth, and the risk of inducing greater vibration and different noise. Reference | Related Articles | Metrics

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Design of Cross-spring Flexure Hinges WU Hao, LI Zongxuan, ZHANG Defu, LI Qingya, LI Yunfeng, China Mechanical Engineering    2022, 33 (10): 1203-1209.   DOI: 10.3969/j.issn.1004-132X.2022.10.009 Abstract （391）      PDF （4097KB）（320）       Knowledge map    Save To realize the requirements of a certain optical instrument for flexural hinges， a new type of cross-spring flexural hinge was proposed， and the design method was studied by using the Castiglianos second theorem. First， the Castiglianos second theorem was used to derive the flexibility calculation formula of the cross-spring flexural hinges to determine the axial rigidity and rotational rigidity of the hinges. Then， a case design was carried out and the finite element analysis was used for simulation. Finally， an optical test platform was set up and the rotation stiffness of the example was measured. The results show that the analytical solution， the simulation solution and the experimental data are in good agreement， and the relative error is as 8.7%. Using the Castiglianos second theorem as a design tool， the designer may determine the dimensional parameters according to the rigidity and structural requirements of the cross-spring flexural hinges， and the design of the cross-spring flexural hinges provides a new approach method for other hinges.  Reference | Related Articles | Metrics

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Design of 3K Planetary Gear Reducers with No Backlash WANG Weijun, YANG Guilin, DU Qinghao, CHEN Qingying, China Mechanical Engineering    2024, 35 (01): 36-44,55.   DOI: 10.3969/j.issn.1004-132X.2024.01.003 Abstract （116）      PDF （10399KB）（160）       Knowledge map    Save Due to the presence of clearances in the gearing of 3K planetary gear reducers， transmission clearances were introduced into the transmission chain， resulting in a decrease in transmission accuracy and causing impacts during driving direction changes. By utilizing the characteristics that the carrier did not participate in torque transmission in 3K planetary gear transmission， a flexible planetary carrier was innovatively proposed to eliminate clearances of 3K planetary gear reducers， and the effectiveness of the proposed clearance elimination mechanisms was verified through simulation analysis. Gear matching and efficiency optimization were performed to achieve high forward and backward driving efficiency. Through the development of a prototype and testing of transmission accuracy， hysteresis characteristics， sinusoidal response error， transmission efficiency， and reverse starting torque， the effectiveness of the proposed flexible planetary carrier in eliminating clearances， transmission accuracy improvement， transmission efficiency and reverse transmission performance promoting was verified.  Reference | Related Articles | Metrics

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Review on Hybrid Flow Shop Scheduling Problems LI Yingli;LI Xinyu;GAO Liang China Mechanical Engineering    DOI: 10.3969/j.issn.1004-132X.2020.23.004 Accepted: 18 December 2020

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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 （1282）      PDF （583KB）（3271）       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. Reference | Related Articles | Metrics

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Extraction Approach of Patent Information Based on Regular Expression Qiu Qingying, Zheng Guomin, Feng Pei’en, Wu Jianwei China Mechanical Engineering    2007, 18 (19): 2326-2329.   Abstract （1429）      PDF （5273KB）（2417）       Knowledge map    Save Since current patent documents are saved as image-based type such as .TIF, .PDF, and so on, they are difficult for full-text search and further analysis. The approach that adoped the optical character recognition (OCR) tool and the fault-tolerant regular expressions was proposed for patent digitization and information extraction according to the structural features of patent documents. The software system was developed to support the batch extraction of patent information, which provided the data resources for the following automatic patent analysis and knowledge mining. Related Articles | Metrics

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Research Review of Error Compensation Technology for Ultra-precision Machining CHEN Qidi, HU Xiaolong, LIN Min, SUN Xiaoxia, ZHANG Tao, ZHOU Zhixiong China Mechanical Engineering    2023, 34 (03): 253-268.   DOI: 10.3969/j.issn.1004-132X.2023.03.001 Abstract （1757）      PDF （8557KB）（510）       Knowledge map    Save  Ultra-precision machining technology was a key technology in high-end manufacturing fields. At present, ultra-precision machining has entered the nano scale. Mastering the key technology of ultra-precision machining error control, ensuring and improving the machining accuracy of CNC machine tools, become a hot research point to improve the machining and manufacturing levels. This paper systematically summarized the research status and development trend of ultra-precision machining error compensation technology, and focused on the geometric errors, force induced errors, thermal induced errors and their compensation methods, which had the greatest impact on ultra-precision machining. Then, a series of problems of ultra-precision machining in geometric error separation, cutting force, thermal induced error measurement and compensation were deeply discussed, and it is further pointed out that the ultra-precision machining error compensation technology should also pay attention to the development direction of high efficiency, high precision, generalization, modularization, intelligence and flexibility. Reference | Related Articles | Metrics

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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 （2581）      PDF （681KB）（8192）       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. Reference | Related Articles | Metrics

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Research on Multi-axis Road Simulation Test of a New Type of Commercial Vehicle Cab ZHOU Song, CHEN Yu, DONG Hongliang, GAO Xiang, SHEN Juan, ZHOU Jia, WAN Xinming China Mechanical Engineering    2023, 34 (10): 1241-1250.   DOI: 10.3969/j.issn.1004-132X.2023.10.014 Abstract （233）      PDF （10957KB）（185）       Knowledge map    Save In order to improve the control accuracy of commercial vehicle cab multi-axle road simulation test bench and accurately reproduce the collected signals of road spectrum， a control strategy of multi-axle road virtual test bench was proposed based on kinematics and dynamics analysis. According to the principle of mechanisms， the structures of the test benches were described， the kinematics analysis and calculation were carried out. The closed-loop feedback degree of freedom decoupling was carried out by using the inverse pose solution algorithm and the forward solution algorithm with Jacobian matrix. The rigid-flexible coupling multi-body dynamics models of the cabs， part of the frames and the test benches were established by measuring the relevant parameters of the cabs and combining with ADAMS software. The Femfat-lab， MATLAB/Simulink and ADAMS software interfaces were established for adaptive co-simulation calculation to realize the decoupling control of freedom of the test bench. The multi-axis virtual test benches were combined with the internal response signals of the real vehicle tests， and the signals with high signal-to-noise were selected as the target signals for iterative analysis to obtain the equivalent displacement excitation of the real vehicle positions. The typical Belgian road load spectrums were selected as the input condition of the models to reproduce the real road spectrums combined with the road tests. The research results show that compared with the indoor road simulation test benches and the conventional virtual iteration results， the number of iterations of the cabs using the multi axis virtual test benches is significantly reduced， the change trend of the time domain and frequency domain response signals obtained is consistent with the target signal， and the root mean square value of the relative error of each channel is less than the set value， so the iteration accuracy is high. Furthermore， the feasibility of the method was verified， which provided a reliable load spectrum for the subsequent fatigue life prediction of the cabs.  Reference | Related Articles | Metrics

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China Mechanical Engineering    2024, 35 (01): 0-.   Abstract （98）      PDF （339KB）（126）       Knowledge map    Save Related Articles | Metrics

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Development History and Future Trends of Numerical Control Machine Tools LIU Qiang, China Mechanical Engineering    2021, 32 (07): 757-770.   DOI: 10.3969/j.issn.1004-132X.2021.07.001 Abstract （2674）      PDF （11426KB）（1863）       Knowledge map    Save  From the viewpoints of industrialization and technology development, the paper summarized the revolutionary history of machine tools and the development processes of NCMT, with the analysis of the kernel technologies of NCMT. The development process of NCMT in China was divided into 3 periods, initial development, consistent technical research and industrialization, and highspeed development, transformation and upgrading as well. The milestone events and achievements were introduced. The industrial scale of NCMT all over the world and the advanced NCMT technologies in several developed countries were presented, followed by the comparative analysis of respects relative with NCMT at home and abroad. Finally, the future development trends were summarized prospectively. Reference | Related Articles | Metrics

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Review on Scheduling Algorithms for MOFJSP Peng Jiangang, Liu Mingzhou, Zhang Mingxin, Zhang Xi China Mechanical Engineering    2014, 25 (23): 3244-3254.   Abstract （923）      PDF （656KB）（1973）       Knowledge map    Save A mathematical model and related definitions of MOFJSP were introduced and the related theories and the research fruits of MOFJSP were summarized. The emphasis was focused on review both of the computational intelligent algorithms and the intelligent search methods. Some future research directions and contents of optimization scheduling algorithms were pointed out and suggestions of related researches in the future were proposed. Reference | Related Articles | Metrics

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Research on Tolerance Optimization Allocation Method Based on 3D Drawings Ai Yandi, Liu Zijian, Yu Zhimin China Mechanical Engineering    2014, 25 (21): 2955-2961.   Abstract （498）      PDF （674KB）（897）       Knowledge map    Save Using MBD and dynamic isolog tree data framework an implementation method of 3D drawings was proposed to provide quality data sources for the tolerance optimization allocation process of NC machine tool. A tolerance analysis model was constructed based on the Jacobi spinor method, and sensitivity analysis for each link of tolerance chain was carried out. Under the conditions of the design requirements and with the principles of minimum cost, the optimal allocation of tolerance in each link was obtained. With grinding head of gantry rail grinder as example, 3D drawings of its components were set up, and the tolerance optimization allocation was completed in the system. The feasibility of tolerance optimization allocation method based on 3D drawings was verified. Reference | Related Articles | Metrics

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Effects of Polished Surface Quality on Corrosion Resistance of Stainless Steel Products HUANG Jia-1, YAN Qiu-Sheng-1, LU Jia-Bin-1, LIU Bing-Yao-2, CHEN Yong-Jin-2 China Mechanical Engineering    2012, 23 (21): 2573-2577.   Abstract （674）      PDF （594KB）（1594）       Knowledge map    Save The chemical immersion method and potentiodynamic polarization method were employed to investigate the effects of surface roughness on corrosion resistance of 304 stainless steel in neutral chloridion solution. The results indicate that with increase of the surface roughness, the mean maximum depth and size of the pits increase. The surface openness parameter δ is proposed to characterize the smoothness degree of the polished surface, and it is approximate negatively and linearly correlated with the pits depth and size. The surface openness parameter δ is more greater, the breakdown potential Eb is more higher, the maintaining passivity current Jpass is more smaller and the corrosion resistance is much better.  Reference | Related Articles | Metrics

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Robot Error Compensation Algorithm by Pseudo Target Iterative Generation YE Bosheng, JIN Xiongcheng, LI Han, SHAO Baiyan, LI Xiaokun, LI Siao China Mechanical Engineering    2024, 35 (01): 136-143.   DOI: 10.3969/j.issn.1004-132X.2024.01.013 Abstract （70）      PDF （2535KB）（94）       Knowledge map    Save Aiming at the problems of error compensation after robot error modeling, an improved algorithm was proposed based on pseudo target iteration. This algorithm generated a new pseudo target in each iteration to correct the joint angles, thereby continuously reducing the actual errors of the robot. The pseudo target iterative algorithmic process was improved to mature the algorithm flow, 5 new and different false target generation methods were proposed, and the characteristics and applicable scenarios of each method were analyzed. An ensemble algorithm was proposed combining multiple false target generation methods to further improve the accuracy of error compensation. Using the HSR-JR612 robot to carry out simulation experiments, the simulation results show that the algorithm takes milliseconds and the compensation effectiveness is good, and the integrated algorithm may further improve the pose compensation effect. Finally, the UR10 robot and the laser tracker were used for experiments. The experimental results show that after compensation, the position errors of the robot end may be reduced to less than 0.06 mm, and the attitude errors may be reduced to less than 0.025°. Reference | Related Articles | Metrics

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Advances in Fluid Dispensing Technology for Micro-electronics Packaging SUN Dao-Heng, GAO Dun-Chuan, DU Jiang, JIANG Yi-Wen, DAO,WEI,WANG Ling-Yun China Mechanical Engineering    2011, 22 (20): 2513-2519.   Abstract （1071）      PDF （660KB）（3027）       Knowledge map    Save Fluid dispensing is a process to dispensing the fluid accurately in a controlled manner,it is one of the key technologies of microelectronics packaging.At present, there is an evolution in the fluid dispensing technology for applying fluids from contact methods to non-contact methods, such evolution will bring a great change for the dispensing industry.Based on the applications of dispensing technology in microelectronics packaging processes,dispensing technical development process was overviewed.Contrasting the features and performances of various methods,the non-contact jetting technology was mainly highlighted,including its key technologies and the evaluation standard of dispensing quality. Reference | Related Articles | Metrics

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Review on Research Status of Positioning Accuracy Reliability of Industrial Robots WU Jinhui1,2；TAO Yourui1,2 China Mechanical Engineering    DOI: 10.3969/j.issn.1004-132X.2020.18.005 Accepted: 07 October 2020

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Thermal-mechanical Coupling Simulation on Mini-stretch Reducing Rolling Process by FEM Yu Hui;Du Fengshan;Zang Xinliang;Wang Feixue;Xu Hailiang J4    2008, 19 (14): 0-1763.   Abstract （1684）      PDF （4109KB）（1246）       Knowledge map    Save Based on rolling technology of mini-stretch reducing mill group,a 3D thermal-mechanical coupled analytic model for tube tandem rolling process had been established by using large deformed elastic-plastic finite element method.The distributional regularities of temperature field,stress field and strain filed were obtained by numerical simulation and actual technical process.The tube wall thickness distribution and the energy parameters were analyzed on the basis of simulation results.Simulated energy parameters are a good agreement with the measured results.The effectivity of model is verified.This model provides a powerful off-line method for analyzing industrial technology of stretch reducing rolling process. Related Articles | Metrics

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Parametric Sensitivity in Reliability Analysis of Bevel Gear Zhou Na;Zhang Yimin J4    2008, 19 (21): 0-2524.   Abstract （1492）      PDF （4359KB）（984）       Knowledge map    Save The reliability-based sensitivity computation and analysis of bevel gears was extensively discussed and a numerical method for reliability sensitivity computation and analysis was presented. The effect of basic normal distribution parameters on reliability of the bevel gears was studied. The respective programs can be used to obtain the reliability-based sensitivity information of the bevel gears accurately and quickly. The method presented herein provides the theoretical basis for reliability design of the bevel gears. Related Articles | Metrics

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Big Data Driven Intelligent Manufacturing ZHANG Jie, WANG Junliang, LYU Youlong, BAO Jinsong China Mechanical Engineering    Accepted: 29 January 2019

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Energy Efficiency Acquisition Method for Machine Tools with Both Tool and Workpiece Axis Rotating during Machining Process ZHANG Xicheng;LIU Fei;LIU Peiji China Mechanical Engineering    Accepted: 09 May 2018

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Industrial Engineering and Lean Management for Smart Manufacturing QI Ershi, HUO Yanfang, LIU Hongwei China Mechanical Engineering    2022, 33 (21): 2521-2530.   DOI: 10.3969/j.issn.1004-132X.2022.21.001 Abstract （1509）      PDF （4622KB）（1073）       Knowledge map    Save This paper reviewed the development routes of developed countries such as the United States， Japan， and Germany since the emergence of industrial engineering for more than 100 years， discussed the regular characteristics of enterprise management innovation， and drew the conclusion that smart manufacturing also needed IE/LM to provide management support. According to the smart manufacturing project cycle， the functions of IE/LM in smart manufacturing engineering were analyzed from the perspectives of basic preparation， scheme selection， and integration development. The framework of lean smart management system for smart manufacturing transformation of Chinese enterprises was given， and the improvement ideas and methods of smart-lean integration were explained based on a case. Finally， some key technologies of smart manufacturing management facing transformation and upgrading of Chinese enterprises were presented based on the actual needs of China.  Reference | Related Articles | Metrics

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On Big Data Driving Manufacturing from “Internet Plus” to “AI Plus” YAO Xifan, LEI Yi, GE Dongyuan, YE Jing China Mechanical Engineering    Accepted: 29 January 2019

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Experimental Study of Saw-tooth Chip Formation in Hard Cutting of SKD11 Jing Lulu, Chen Ming, An Qinglong China Mechanical Engineering    2014, 25 (23): 3151-3154,3159.   Abstract （1352）      PDF （547KB）（1331）       Knowledge map    Save Chips in hard cutting of hardened steel SKD11 were collected and observed by metallographic microscope and SEM; chip metallurgical textures and configuration under different cutting speeds were investigated. Dynamic shearing stress and temperature in adiabatic shear zones were discussed. Results show that in hard cutting of SKD11, saw-tooth chips are formed under both of low and high cutting speeds. Degree of segmentation increases with the increase of cutting speed. The saw-tooth chip formation could be due to fracture and adiabatic shearing; and with the increase of cutting speed, the chip formation mechanism changes from fracture to adiabatic shearing. During adiabatic shearing process, shearing stress develops as a quadratic curve, and cutting temperature shows distinct influence on the dynamic shearing stress. By increasing cutting speed, cutting temperature can be increased, which will weaken the hardening effect and reduce the maximum shear stress, cause occurrence of shearing instability and then reduce cutting force. Reference | Related Articles | Metrics

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Parameter Solution of Instantaneous Milling Force Model of Variable Cross-section Scroll Plates Based on Improved PSO Algorithm LIU Tao;ZHANG Lifang China Mechanical Engineering    DOI: 10.3969/j.issn.1004-132X.2020.24.007 Accepted: 28 December 2020

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Structure Strength Analysis and Optimal Design for Automotive Gearbox Housing MIN Hai-Chao, GAO Juan, MA Tian-Fei China Mechanical Engineering    2012, 23 (20): 2514-2519.   Abstract （913）      PDF （702KB）（2756）       Knowledge map    Save In order to realize the lightweight of the gearbox housing,the finite element analysis was used to build the gearbox housing model of a light-duty trucks,which was analyzed and vertified by modal test,including structural strength analysis under statics and dynamics conditions.Based on the analysis results,a topological optimization design for the gearbox housing was carried out.The optimization results show that the mass of the improved gearbox housing has reduced 8% which is reduced from 30kg to 27.6kg,on the premise of the box's stiffness staying the same and the strength and vibration performance of the box basically unchanged. Reference | Related Articles | Metrics

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A Bionic Bouncing Robot Design and Made Inspired by Locusts WANG Kaidi, CHEN Suifan, TANG Wei, QIN Kecheng, LI Qipeng, YANG Zhan, LIU Yang, ZOU Jun China Mechanical Engineering    2023, 34 (24): 2946-2951.   DOI: 10.3969/j.issn.1004-132X.2023.24.006 Abstract （229）      PDF （3896KB）（255）       Knowledge map    Save  In order to improve the mobility of small robots and increase the diversity of movement gait, a jumping robot imitating locust bouncing was designed based on the body structure and movement mechanism of locusts, and the main body was made by 3D printing. And for reproducing the locusts bouncing mechanism, a torsion spring was installed at the joints of the robot body to simulate the locusts SLP(semilunar energy storage) mechanism. When the robot met an obstacle, the torsion spring released the stored elastic potential energy and generated a ground reaction force, which realized the robots bouncing and thus crossed the obstacle. The robot might imitate the locusts jumping actions, and simulate the locusts flexibility to a certain extent. It was experimentally verified that the robot has good jumping performance, with a jumping distance of up to 100 cm and a jumping height of up to 120 cm which is about 15 times of the own length. Reference | Related Articles | Metrics

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Configuration and Optimization of Hundred-ton Series Electric Drive Mining Dump Truck's Wheel Drive System He Jiancheng, Shen Yanhua, Zhang Wenming China Mechanical Engineering    2013, 24 (22): 3110-3113.   Abstract （804）      PDF （501KB）（1512）       Knowledge map    Save In connection with nearly 30 different international brands of hundred-ton series electric drive mining dump trucks,the structure of wheel reducers and the variation of the gear ratio's value were analyzed. According to the technical conditions of electric drive mining dump truck and the development situation of wheel motor, configuration and optimization of wheel drive system were described based on the calculation method of wheel motor's power and the gear ratio i of  wheel reducer.The results provide an important basis for the configuration and optimization of similar wheel drive system. Reference | Related Articles | Metrics

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Reduction Fuel Consumption Method for a Commercial Vehicle Jiang Jian, Xiao Hui, Wu Zhaohui, Wu Bing China Mechanical Engineering    2014, 25 (24): 3403-3407.   Abstract （541）      PDF （585KB）（2196）       Knowledge map    Save In order to reduce fuel consumption, this paper introduced to several methods such as air resistance optimization, lightweight of automobile, optimization of the rolling resistance and the transmission ratio. Firstly, the methods of CFD data simulation were adopted to optimize the shape for a commercial vehicle, then integrated with the clay model wind tunnel test the effects for the optimization of air resistance were validated. Secondly, in order to optimize the rolling resistance lightweight of automobile, lower-rolling resistance coefficient of tyre were applied. At last, in order to the commercial vehicle working in the economic area the transmission system ratio was optimized. Reference | Related Articles | Metrics

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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 （1647）      PDF （684KB）（12285）       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. Reference | Related Articles | Metrics

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Analysis of Influence Factors for Density of Compressed Powder Products during High Velocity Compaction YU Shiwei;ZHOU Jian;ZHANG Wei;ZHANG Xuejie;LIU Kun China Mechanical Engineering    Accepted: 09 May 2018

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Control Strategy of Hybrid Excavator Based on Condition Recognition and Hybridization Optimization WANG Dong-Yun, GUAN Cheng China Mechanical Engineering    2010, 21 (23): 2790-2793.   Abstract （2179）      PDF （3311KB）（1291）       Knowledge map    Save The hybrid technology brought new opportunity to energy saving of a hydraulic excavator.However, the control strategy is hard to be determined because of the complexity of working condition and cyclic fluctuation of the load. As the dynamic-work-point control strategy can not optimize the main power source and the auxiliary one simultaneously, a new control strategy based on condition recognition and hybridization optimization was presented. It optimized the power distribution rate between the two power sources according to the load condition and the SOC(state of charge) of the battery. Experimental results show that the control strategy ameliorates the speed fluctuation of the engine, optimizes the working points of the engine and SOC of battery. Ultimately it improves the fuel economy of the hybrid hydraulic excavator. Reference | Related Articles | Metrics

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Research on Interaction between Pedestrian and Automated Vehicle LYU Wei, GUO Fu , LIU Li, ZHANG Zeyu, WANG Tianbo China Mechanical Engineering    2023, 34 (05): 515-523.   DOI: 10.3969/j.issn.1004-132X.2023.05.002 Abstract （468）      PDF （3924KB）（343）       Knowledge map    Save From the perspective of the pedestrian-vehicle-environment system, the effects of pedestrian safety facility, AVs yielding behavior, approaching direction and eHMI on pedestrian-AV interaction were investigated. Based on a cave automatic virtual environment(CAVE) simulation platform, the Unity 3D software was utilized to design and develop the AVs driving scenario. Thirty-eight volunteers were recruited for the pedestrian-AV interaction experiments. During the experiments, the participants decision time, decision results and subjective experience were recorded and further statistically analyzed with survival analysis. The results indicate that with the presence of an AV in the traffic, pedestrian safety facility, AVs yielding behavior and eHMI may significantly shorten pedestrians decision time, enhance their interactive experience and improve traffic efficiency. However, the influences of pedestrian safety facility on pedestrians crossing decision and behavior exist from the earlier stage of the crossing gap, compared with AVs yielding behavior. Meanwhile, the efficacy and clarity of a light band-based eHMI are somewhat limited for conveying AVs yielding intention. Reference | Related Articles | Metrics

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Research on Niche Genetic Annealing Algorithm with Elite Strategy and Its Applications LIU Ai-Jun-1, 2, YANG Yo-1, GENG Jing-Song-1, LIU Hui-3, ZHANG Yu-Dong-4 China Mechanical Engineering    2012, 23 (5): 556-563.   Abstract （1483）      PDF （697KB）（1574）       Knowledge map    Save According to the defects of traditional genetic annealing algorithm, a niche genetic annealing algorithm was presented, which avoided the effective gene deletions at the early search stage and guaranteed the diversity of solution.Then adaptive double point crossover and swap mutation strategy were introduced to overcome the defects of long solving process and easily converging local minimum value due to the fixed crossover and mutation probability.The elite reserved strategy was imported, optimal solution missing was avoided effectively, evolution speed was accelerated. At last, the new algorithm was tested by three typical functions and the job shop scheduling problems, respectively. The simulation results show that the proposed algorithm can avoid the stagnation, improve the global convergence ability, and attain better optimization performance. Reference | Related Articles | Metrics

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#br# Bonding Effects on Stability of Structures in MEMS JIANG Meng-Xia, WANG Lei, TANG Ji-Ying China Mechanical Engineering    2012, 23 (18): 2155-2159.   Abstract （786）      PDF （524KB）（1195）       Knowledge map    Save MEMS devices with movable structures can be influenced by unmatched stress introduced by packaging process, leading to the change of structural reliability. The packaging effects on stability of MEMS structures were studied, and structural unstablity behaviors,such as buckling and adhesion, were observed after packaging. Analytical models of vibration and adhesion of beam structure were set up to predict the unstable behaviors. Experiments on surfaced-micromachined polysilicon structures indicate that compression stress is introduced after bonding, and the resonant frequency and contact resistance change considerably after the stability of devices is changed. Reference | Related Articles | Metrics

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Study on Climbing Type Current Phenomenon in EDM of Semiconductors Pan Huijun, Liu Zhidong, Qiu Mingbo, Tian Zongjun China Mechanical Engineering    2014, 25 (13): 1773-1778.   Abstract （495）      PDF （720KB）（936）       Knowledge map    Save The phenomenon of climbing type current in semiconductor EDM was studied. Results show that the main influence factor that leads to the climbing type current is the changes of the contact resistance. The value of contact resistance is decided by the contact area of the high-temperature region. Properties of climbing type current curve were researched and the influences of temperature, thermal conductivity and phase change energy on contact resistance and current were  discussed. At last, the influences of electric parameters on the machining process  were  researched. It is found that big pulse width, high voltage and small duty ratio can increase the processing efficiency greatly. Reference | Related Articles | Metrics

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Research Status and Development Tendency of Wind Turbine Reliability LI Yao1;ZHU Caichao1;TAO Youchuan2;SONG Chaosheng1;TAN Jianjun1 China Mechanical Engineering    Accepted: 04 May 2017

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Digital Transformation Mode and Strategy of SMEs in China WANG Baicun, ZHU Kailing, XUE Yuan, BAI Jie, ZANG Jiyuan, XIE Haibo, YANG Huayong, China Mechanical Engineering    2023, 34 (14): 1756-1763.   DOI: 10.3969/j.issn.1004-132X.2023.14.013 Abstract （657）      PDF （5220KB）（478）       Knowledge map    Save Promoting the digital transformation of SMEs was of great significance for Chinas manufacturing industries to improve quality and increase efficiency. SMEs were facing problems in digital transformation, such as high cost, fuzzy path, talent shortage, and lacking analytical framework and reference paradigm for digital transformation. The key factors to achieve digital transformation were clarified by building an analytical framework for SMEs digital transformation herein. Through case studies, 4 basic path models of digital transformation of SMEs were summarized and proposed. Based on the above researches, targeted suggestions were proposed for SMEs digital transformation in China, so as to promote the digital and intelligent development of SMEs. Reference | Related Articles | Metrics