最新刊期
      期 5 ， 2017
      • Tao Kun,Qi Xiumei,Gao Chuangkuan
        Vol. 41, Issue 5, Pages: 1-4(2017) DOI: 10.16578/j.issn.1004.2539.2017.05.001
        摘要：The surface roughness data of test-piece with transverse roughness profiles are measured.With the help of the Fourier approximation,the measured data are used to form a roughness function which is then added to the oil film thickness equation and a model of mixed elastohydrodynamic lubrication for an involute spur gear transmission is established. Based on this model,nearly 130 groups numerical calculations are carried out through changing the pinion speeds for medium and heavy-duty gear transmissions respectively.The computing results show increasing the pinion speed can effectively improve the gearing lubrication state and reduce the contact stress on rough surface. However,decreasing of the contact stress is very slowly with the addition of the pinion speed when the speed exceeds a certain value.  
        关键词：Actual roughness tooth surface;Gear speed;Contact stress   
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        发布时间：2022-10-20
      • Huang Gang,Zhang Weiqing,Guo Xiaodong,Wang Ge,Wen Yikai
        Vol. 41, Issue 5, Pages: 5-9(2017) DOI: 10.16578/j.issn.1004.2539.2017.05.002
        摘要：Based on the generating theory of the pinion of spiral bevel gears and the relative motion theory,the tooth flank equation with the work head setting high order modification formula is established. According to the manufacturing parameters of the working gear flank of a spiral bevel gear set,a program is written on the platform of Matlab to calculate the modified tooth flank coordinates. Through constructing tooth flank form error figures and computing contact zones of the calculated tooth flank,the effects of work head setting high order modification on tooth flank form and contact zone of spiral bevel gears are analyzed,which can provide theoretical basis and valuable reference to facilitate the control of tooth flank form and contact zone of spiral bevel gear.  
        关键词：Spiral bevel gear;Work head setting;High order modification;Tooth flank form;Contact zone   
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        发布时间：2022-10-20
      • Gu Cunhang,Mao Huping,Wang Qiang,Shi Yuncai
        Vol. 41, Issue 5, Pages: 10-14(2017) DOI: 10.16578/j.issn.1004.2539.2017.05.003
        摘要：Based on the traditional traction planetary ring cone friction continuously variable transmission,the planetary ring bevel gear power split type continuously variable transmission is firstly proposed,and the derivation with two methods of its overall gear ratio is carried out. Furthermore,the power flow direction and distribution relationship are obtained accurate judgments. Finally,the overall transmission efficiency of the transmission system is analyzed and calculated in detail,comparative analysis of the transmission efficiency with the original planetary rings cone continuously variable transmission is carried out by using the example. The numerical range of total input power is obtained with the power split ratio diagram. The results show that,the improved planetary ring bevel gear power split type continuously variable transmission not only has a higher transmission efficiency than the original planetary rings cone continuously variable transmission,but also the total input power of the improved transmission can be up to the original transmission a few times,a high-power transmission is achieved.  
        关键词：Planetary ring bevel gear power split type continuously variable transmission;Power flow;Transmission efficiency;High-power transmission   
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        发布时间：2022-10-20
      • Chen Wenjie,Zou Min,Zhu Hailin,Wang Zhiyang
        Vol. 41, Issue 5, Pages: 15-18(2017) DOI: 10.16578/j.issn.1004.2539.2017.05.004
        摘要：For the defects of traditional gear pump can not pump oil in a linear way and its tooth profile line is complex,a new type of lelord triangle pump is put forward. In which the section of helical rotor is lelord triangle,and three such rotors are mount parallel. The pump can pump oil in a linear way with its rotor rotating in the same direction. Besides,the pump combined with the characteristics of gear pump and propeller. The mathematical model of lelord triangle is established. The analysis of the motion position of the lelord rotor is carried out,and the displacement and instantaneous flow rate of the internal cavity of the three rotors are calculated. It laid a foundation for the research and experiment of this pump in the later stage and a new way of thinking for pump oil in a linear way is provided.  
        关键词：Lelord triangle pump;Gear pump;Same direction rotation;Displacement;Instantaneous flow rate   
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        发布时间：2022-10-20
      • Wang Wuguang
        Vol. 41, Issue 5, Pages: 19-23(2017) DOI: 10.16578/j.issn.1004.2539.2017.05.005
        摘要：Taking planetary gear pair time-meshing stiffness,meshing damping,bearing support stiffness,support damping of vertical mill reducer into consideration,the vibration differential equation of planetary gear transmission is set up based on lumped parameter method,the dynamic mesh force of each gear pair is obtained by adopting Runge-Kutta method. The sun gear of no floating and eccentricity error of sun gear,planet gear,gear ring are studied to get its effect on planetary transmission load sharing characteristic. The results indicate that floating of sun gear has significant impact on planetary transmission load sharing characteristic. Considering the only factor of sun gear eccentricity error,gear ring eccentricity error separately has better load sharing characteristic than complex considering eccentricity error of sun gear,planetary gear and ring gear,the eccentricity error has little effect on load sharing characteristic,when the sun gear is no floating,the load sharing characteristic of system will be worse.  
        关键词：Vertical mill reducer;Planetary transmission;Load sharing;Influential factor   
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        发布时间：2022-10-20
      • Ge Weimin,Zhao Wen,Wang Xiaofeng,Liu Jun,Liu Zengchang
        Vol. 41, Issue 5, Pages: 24-29(2017) DOI: 10.16578/j.issn.1004.2539.2017.05.006
        摘要：For the static error about dimensions error and geometric parameters error of reconfigurable robot caused by the design and manufacture of modules and its configuration change,the static geometric parameters error of reconfigurable robot is treated as the structural error and transmission error of the joint,and is assumed to be the result of tiny screw motion,then an kinematic error model of robotic is built by using the products of exponentials formula. Based on the relationship between input error and output error of reconfigurable robot,an error sensitivity coefficient model is established. The sensitivities coefficient of error parameters and the influence law of the error parameters on the position of the end-effector are analyzed with MATLAB,it is benefit to the further analysis and optimization of reconfigurable robot trajectory accuracy,and also provides effective theoretical foundation for designing and assembling of industrial robot with different accuracy requirements. A simulation experiment about a six-DOF（ degrees of freedom） reconfigurable robot is carried out,and the result show that the modeling method and sensitivity analysis method are effective and correct.  
        关键词：Reconfigurable robot;Screw;Error modeling;Error sensibility   
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        发布时间：2022-10-20
      • Wang Xu,Li Dongsheng,Wang Mingming
        Vol. 41, Issue 5, Pages: 30-33(2017) DOI: 10.16578/j.issn.1004.2539.2017.05.007
        摘要：Intends to accurately identify joint stiffness parameters of industrial robot under heavy load condition,firstly,dexterity of the robot in joint space and workspace is determined based on the Frobenius norm of Jacobian matrix,then,the integrated model of load and robot are built by using equivalent torque method,and finally,a deformation error compensation method by directly calculating joint deformation and compensating is put forward. The laser tracker and ABB IRB 6 640 robot are used to conduct kinematic error compensation experiment,joint stiffness identification experiment and joint deformation compensation experiment. The results show this method can effectively compensate joint deformation and thus improve the absolute accuracy of the robot. The positioning error of the robot is significantly reduced from 0. 694 mm to 0. 230 mm,with an accuracy improvement by roughly 67%.  
        关键词：Industrial robot;Calibration;Joint stiffness;Error compensation;Heavy load   
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        发布时间：2022-10-20
      • Qu Xiang,Ma Anpeng,Zhang Jun,Liao Linqing
        Vol. 41, Issue 5, Pages: 34-38(2017) DOI: 10.16578/j.issn.1004.2539.2017.05.008
        摘要：To improve the shifting quality of dual clutch transmission（ DCT）,the core issue of two clutches pressure control and engine speed control are studied,an integrated upshift control strategy is put forward.The simulation model of transmission system is established by using the Matlab/Simulink software,the simulation calculation of the DCT upshift under the integrated control strategy is carried out. The results show that the engine and high gear clutch speed quick synchronization can be implemented and the clutch friction work,the shift jerk can be kept in the ideal level and the shift quality of DCT vehicle is improved significantly.  
        关键词：Dual clutch transmission;Integrated control strategy;Shifting quality;Upshift   
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        发布时间：2022-10-20
      • Kan Jinbiao
        Vol. 41, Issue 5, Pages: 39-44(2017) DOI: 10.16578/j.issn.1004.2539.2017.05.009
        摘要：The engagement between travelling wheel and pin rail is non-conjugated drive,the traditional strength check method for gear is no longer applicable for travelling wheel. In the past,the finite element static mechanical simulation analysis is used for strength check of travelling wheel mostly,but the static mechanical simulation analysis can not accurately reflect the actual stress state of travelling wheel,and the calculation result is not very accurate. In order to check the strength of the 176 mm pitch compound tooth profile travelling wheel more accurately,the dynamic mechanical simulation model of 176 mm pitch compound tooth profile travelling wheel is established by Solid Edge and ANSYS software. The simulation data of contact stress and bending stress changed with time are extracted to draw curves. By comparing the simulation results and the allowable stress values of the travelling wheel materials,it is found that the 176 mm pitch compound tooth profile travelling wheel can meet the requirement of the 1 500 k N traction force of shearer. Meanwhile,the change law of contact stress and bending stress with time is summarized,which is from travelling wheel tooth entering into engagement to disengaging engagement. The engagement positions between travelling wheel and pin rail when the peak value of contact stress and bending stress occurred are obtained. A basis for the further optimization of the travelling wheel tooth curve is provided. By comparing the theoretical calculation results with the simulation results,the correctness of the simulation results is verified.  
        关键词：Compound tooth profile;Travelling wheel;Dynamic mechanical simulation   
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        发布时间：2022-10-20
      • Wang Jinhong,Lin Yong,Li Hailin
        Vol. 41, Issue 5, Pages: 45-52(2017) DOI: 10.16578/j.issn.1004.2539.2017.05.010
        摘要：According to the mechanical characteristics of the terrain of sea bed cobalt crusts and hydrothermal sulfide mining,based on the traditional road tracked vehicle,a solid wheels-rubber tracked traveling mechanism in deep sea bed is designed. The dynamics modeling of tracked traveling mechanism in deep sea bed is built based on the structural characteristics. In dealing with the engaging force,the application of elastic contact theory,the meshing force is equivalent to the force of the resilient contact. The driving force mechanism is analyzed and the influencing factors are analyzed. Based on Recurdyn,the simplified dynamics model of the traveling mechanism in deep sea bed is built,imposing constraints,contacts,forces and motion control functions,and the terrain and environmental conditions in different types when run under the sea bed are analyzed.The results show that,the engaging force between solid wheel and track pin changes with the positive pressure changes,the positive pressure occurs the maximum and corresponding to the maximum of engaging force,then the positive pressure and engagement force is cyclical change along with the caterpillar. Meanwhile,a greater ripple of the speed,running gear,acceleration,driving torque and so on is caused by the tracked speed dynamic load. However,the tracked traveling mechanism is still running driven relatively stable.  
        关键词：Tracked;Traveling mechanism in deep sea bed;Rubber;Operating condition;Performance;Model   
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        发布时间：2022-10-20
      • Xie Zhijiang,Wu Xiaoyong,Zhang Jun,Pang Zhi,Sun Qi
        Vol. 41, Issue 5, Pages: 53-58(2017) DOI: 10.16578/j.issn.1004.2539.2017.05.011
        摘要：Based on the homogeneous coordinate transformation principle,the integrated inverse kinematics of the 3-PPR parallel mechanism is established,and the first-order coefficient method is applied to work out its Jacobian matrix. The rigid-body dynamics model is derived by using the Lagrange equation. Comparing the rigid-body dynamics simulation results under the typical working condition separately obtained by ADAMS and Matlab,the validity of theoretical analysis is verified. Then the flexible dynamics simulation is conducted by combining ANSYS and ADAMS,which forms the foundation of complete dynamics analysis. The research provides necessary information for dynamic performance analysis,control of the system and error analysis of the parallel mechanism,it also can be used to deal with the dynamics problem of similar parallel mechanisms.  
        关键词：Parallel mechanism;Kinematics;Dynamics;Lagrange equation   
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        发布时间：2022-10-20
      • Wang Chengtao,Wang Yuqiao,Yang Xuefeng,Liu Yufei,Wei Huaxian,Sheng Lianchao
        Vol. 41, Issue 5, Pages: 59-63(2017) DOI: 10.16578/j.issn.1004.2539.2017.05.012
        摘要：The single parallel four-bar flexure hinge mechanism is widely used as the prismatic pair of the ultra-precision stage and precision sensors. Since the ultra-precision stage produces the displacement depended on it,so the stiffness of single parallel four-bar flexure hinge mechanism has a great influence on the positioning accuracy of ultra-precision stage. Aiming at three types of single parallel four-bar flexure hinge mechanisms,the theoretical calculation of stiffness is carried out,then,the mechanisms are analyzed by the finite element software ANSYS 12. 0. The influences of different external dimensions on the stiffness and relationship between stiffness of three types of mechanisms are obtained through comparison and analysis,a reference for their application occasions and the selection in MEMS design is provided.  
        关键词：Single parallel four-bar flexure hinge mechanism;Flexure hinge;Stiffness;MEMS;Ultra-precision stage   
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        发布时间：2022-10-20
      • Su Jinzhan,Yang Xiaohui,Guan Yabin,Liu Guanglei
        Vol. 41, Issue 5, Pages: 64-66(2017) DOI: 10.16578/j.issn.1004.2539.2017.05.013
        摘要：Considering that the simplified formula of the gear handbook or the general crown gear coupling are not suitable for the design of the large marine crown gear coupling,an analytical system of the crown gear coupling is developed. Taking a marine crown gear coupling as an example,the model of crown gear coupling with high accuracy is established by the analytical system. Then,the model data is imported into the ANSYS software,the finite element analysis of gear teeth is carried out,and the distributions and trend of variation of the tooth stress under alignment and limit misalignment conditions are obtained,the basis for the design of the large marine crown coupling is provided.  
        关键词：Large marine;Crown gear coupling;Stress analysis;ANSYS   
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        发布时间：2022-10-20
      • Tian Guangjun,Gu Lina,Lü Panjie
        Vol. 41, Issue 5, Pages: 67-71(2017) DOI: 10.16578/j.issn.1004.2539.2017.05.014
        摘要：A rotary joint actuating device of robot is designed combining the screw transmission mechanism with the crank-slide mechanism. Firstly,with the software Solid Works,the three-dimensional model of the rotary joint is built. Based on the motion analysis,the mathematical model of the rotary joint is established,the rotational range of the end-effector is got. Then,the theoretical output torque of the end-effector is taken as object function,the relationship between the output torque and the rotation angle is analyzed to further verify the rationality of the parameters design. At last,the experimental prototype is made,and the angle measurement scheme is presented for the rotary joint. An electrical test platform of the rotary joint is set up. The test results show that the motion range of the rotary joint is larger and the effect of its mechanical transmission is good.Also,the rotary joint is easy to control and its structure is simple.  
        关键词：Rotary joint;Screw transmission mechanism;Crank-slider mechanism;Angle sensor;Electrical drive   
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        发布时间：2022-10-20
      • Gao Aiyun,Tian Songwen
        Vol. 41, Issue 5, Pages: 72-76(2017) DOI: 10.16578/j.issn.1004.2539.2017.05.015
        摘要：Based on the power system parameters of a certain type Hybrid Electric Vehicle（ HEV）,a planetary gear type power coupling device is designed for power transmission structure which can meet the requirement of power. Then,the main parameters of the planetary gear set and the transmission ratio are determined. The planetary gear type power coupling device modeling,assembly and movement simulation are carried out by using the UG NX8. 0. Through analyzing the results of movement simulation and theoretical calculation,it is validated that the design of planetary gear type power coupling device is reasonable,and lay a foundation for the subsequent finite element analysis and structure optimization.  
          
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        发布时间：2022-10-20
      • Lai Lingyun,Zhang Ruochen,Liu Yongzhi
        Vol. 41, Issue 5, Pages: 77-80(2017) DOI: 10.16578/j.issn.1004.2539.2017.05.016
        摘要：The torsional vibration dynamics analytical model of rotor power transmission system is built,the shimmy collectivity mode of vibration and frequency of rotor blade are obtained,it is indicated that the propulsion/transmission system will influence shimmy mode obviously, the frequency of blade shimmy will be changed. Through the torsional vibration frequency test of helicopter rotor power transmission system,method and result correctness are verified.  
        关键词：Torsional vibration;Rotor power transmission;Shimmy   
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        发布时间：2022-10-20
      • Wang Liangwen,Song Kangkang,Shi Changmin,Wang Caidong,Du Wenliao
        Vol. 41, Issue 5, Pages: 81-85(2017) DOI: 10.16578/j.issn.1004.2539.2017.05.017
        摘要：In order to realize ankle recovery,a kind of auxiliary device for ankle rehabilitation based on a ball pair is developed. The device adopts the center ball pair as the support,and 3S’PS’ branch chain as drive system,the three-dimensional motion of the working platform can be formed,and the dorsal flexion/plantar flexion movement,varus/valgus movement and adduction/abduction movement can be realized for ankle. Based on introducing the structure of the rehabilitation device,an inverse kinematic modeling and analysis for the device are performed. Arming at the multiple kind of movement patterns of system,an inverse kinematic modeling and analysis are completed respectively. The related calculation formulas are deduced and relation charts of motion angle between working platform and motor are plotted by using the Matlab. The research process provides a reference for the mechanism analysis of similar structure.  
        关键词：Ankle;Bionic;Auxiliary rehabilitation device;Inverse kinematic modeling   
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      • Yao Fangfang,Ma Haiying
        Vol. 41, Issue 5, Pages: 86-92(2017) DOI: 10.16578/j.issn.1004.2539.2017.05.018
        摘要：The gear pump is an important component of the hydrodynamic automatic transmission,which provides oil for the automatic shift system and lubrication and cooling system. Based on hydraulic automatic transmission design,according to the structural characteristics of the radial outer engaging in parallel multi-tooth gear pump,an internal study for trapped oil phenomena encountered in the process of their work,the causes and solutions are analyzed. Through gear pump structure optimization,the bias unloading groove design is proposed,and analysis of its size and location is carried out. Based on CFD,the three different forms of gear pump structure work flow field are analyzed and compared,and test bench is built for experimental study of the gear pump performance after the optimization design to verify the accuracy of the analysis. The results show that,when the bias unloading opening slot design appropriate parameters can effectively improve the phenomenon of trapped oil,gear pump and volumetric efficiency is improved. By comparing experimental test of volumetric efficiency shows accuracy and reliability of the structural optimization design and built mathematical model,a reference for such transmission gear pump design is provided.  
          
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        发布时间：2022-10-20
      • Wu Liguang,Wang Le,Jing Lixin,Liu Zhonghai
        Vol. 41, Issue 5, Pages: 93-96(2017) DOI: 10.16578/j.issn.1004.2539.2017.05.019
        摘要：The effect of universal joint position on the output shaft speed curve phase is analyzed in single universal joint transmission. Then,the fluctuation superposition principle of double universal joint transmission is studied and expanded to multi universal joint transmission. For transmission structure with reduction gears,the delivery of speed at bevel gears and fluctuation superposition of multiple universal joint are analyzed. Finally,by finding the optimum value of the phase angle of each universal joint,the speed fluctuation of the output shaft of a specific vehicle steering mechanism is reduced to a minimum.  
        关键词：Steering transmission;Universal joint;Speed fluctuation;Reduction gear   
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        发布时间：2022-10-20
      • Dai Haolin,Fu Jinqi,Zhao Hao,Du Jun,Zhu Changjin
        Vol. 41, Issue 5, Pages: 97-100(2017) DOI: 10.16578/j.issn.1004.2539.2017.05.020
        摘要：The influence of different mounting distance of driving device of side-arm charger（ SAC） on the engaging force of driving gear and rack and moving stability of SAC is analyzed. By using the theoretical calculation and ADAMS software,the analysis and study of the dynamic behavior of driving gear and rack of SAC in the process of movement are carried out. The results has provide a reference for SAC driving device design.  
        关键词：Side-arm charger;Muti-gear and rack;Adams   
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      • Qiao Jinwei,Wu Zhifei,Wang Tie,Zhang Ruiliang,Wang Daoyong
        Vol. 41, Issue 5, Pages: 101-105(2017) DOI: 10.16578/j.issn.1004.2539.2017.05.021
        摘要：The vibratory finishing process is applied to spur gear processing of surface finishing,and the surface roughness is reduced. The vibration performance contrast experiment of test gear is carried out in the closed power flow test bench,the results indicate that vibration and noise are reduced under three kinds of conditions,thus the vibratory finishing has an obvious effect of vibration reduction,and it has a certain value of reference and application.  
        关键词：Vibratory finishing;Spur gear;Vibration characteristic;Experiment study   
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      • Wang Huiliang,Fang Yi,Ren Xiaozhong
        Vol. 41, Issue 5, Pages: 106-110(2017) DOI: 10.16578/j.issn.1004.2539.2017.05.022
        摘要：In order to study the vibration characteristic of vertical column of cycloid gear grinder,the three-dimensional solid model is established based on the vertical column component of cycloid gear grinder,and the pre-stress modal analysis is carried out based on the finite elements software ANSYS simulation. The natural frequency and corresponding vibration mode of the component are obtained. To study the real vibration characteristic of the vertical column,the vibration test platform is set up. Then the time-frequency characteristic of the collected data are analyzed,and the vibration mechanism of the vertical column is explored. The experimental results show that the vertical column is better in the low order frequency characteristic,and compared with the free working conditions under the same direction,the maximum vibration amplitude of the corresponding peak at the same frequency is not more than 4. 7%. Finally,the rationalization proposal for design and optimization of the vertical column are put forward from the vibration.  
        关键词：Cycloid gear grinding machine;Natural frequency;Vibration characteristic;Modal analysis   
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      • Zhang Duo,Huang Qingxue,Chu Zhibing,Wei Dong
        Vol. 41, Issue 5, Pages: 111-118(2017) DOI: 10.16578/j.issn.1004.2539.2017.05.023
        摘要：A new rolling shear mechanism which is driven by one horizontally positioned hydraulic cylinder is put forward through analyzing the present shear mechanism at home and abroad. In order to achieve pure rolling and shearing,the simplify model of PR-11RⅢ-level composite rod linkage mechanism is obtained.Besides,by using the method of assur-group decomposition modeling,the dynamics model of every assur-group and corresponding simulation model are established,and the simulation module of the corresponding function is compiled. Finally,depending on the development project on extensive popularization of 2 000 mm rolling shear mechanism driven by one hydraulic cylinder of a machinery company,the dynamics simulation is conducted by using the Matlab/Simulink. The important basis for mechanism design of the rolling shear and control principle analysis and actual use is provided by the dynamics curve and parameter of key hinge joint botained from the simulation result,the correctness of the dynamic analysis is verified.  
        关键词：Composite rod linkage mechanism;Rolling shear mechanism;Dynamics;Simulation module   
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      • Li Zhanguo,Li Shuiqing,Shi Yaochen
        Vol. 41, Issue 5, Pages: 119-122(2017) DOI: 10.16578/j.issn.1004.2539.2017.05.024
        摘要：Taking the ZA automotive synchronous belts that the belt width is 19 mm and 25 mm as research object,the influence of the belt width on the vibration and noise of the automotive synchronous belt is analyzed in theory. A finite element analysis model of the ZA automotive synchronous belt drive system is established,the natural frequency characteristic of the automobile synchronous belt transverse vibration and its harmonic response under the action of meshing impact excitation are analyzed,and taking the surface vibration displacement of the synchronous belt obtained by harmonic response analysis as boundary condition,the acoustic boundary element analysis model of the automobile synchronous belt is established by the direct boundary element method that its sound field is closed,the radiated noise of automotive synchronous belt is simulated and analyzed,the sound pressure cloud picture and the frequency response curve of radiation pressure of two synchronous belt with different bandwidth are obtained,and the influence law of the belt width on the vibration and noise of the synchronous belt is studied.  
        关键词：Automotive synchronous belt;Belt width;Vibration;Radiated noise   
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      • Wang Junyuan,Li Weiwei,Ma Weijin,Zhang Jiping
        Vol. 41, Issue 5, Pages: 123-126(2017) DOI: 10.16578/j.issn.1004.2539.2017.05.025
        摘要：The modal of engine,gearbox and frame are tested by the method of hammer excitation,and the modal parameters are obtained. Through interception the vibration signals when the empty light truck on washboard road and obstacles road,the modal test analysis of the vibration signal is carried out,the modal parameters of different stages of the light truck in the working environment are obtained. Finally,the test results are summarized and analyzed,several sensitive modal frequencies are found. Those found would provide theory and technical support for further study on dynamic analysis to estimate the basic reason of the damaging of the engine,gearbox and the frame.  
        关键词：Operating modal;Experimental modal;Modal shape   
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        发布时间：2022-10-20
      • Wang Yu,Wei Xiuye
        Vol. 41, Issue 5, Pages: 127-131(2017) DOI: 10.16578/j.issn.1004.2539.2017.05.026
        摘要：Based on the background of rolling bearing fault diagnosis,taking the JZQ250 type transfer-box as test object,the shuffled frog leaping algorithm（ SFLA） is combined with back propagation（ BP） neural network,by using the efficient computing performance and the excellent ability of global optimization of shuffled frog leaping algorithm,the network structure of BP neural network is optimized. Through comparison,it is found that the BP neural network model optimized by shuffled frog leaping algorithm can avoid making it fall into local optimum,reduce the training time and improve the training accuracy during the training of the network,and have several advantages,such as relatively higher convergence rate and ability to accurately diagnose.Through a series of training and testing,the results show that this approach can improve the accuracy and reliability of fault diagnosis.  
        关键词：Rolling bearing;Shuffled frog leaping algorithm;BP neural network;Fault diagnosis   
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      • Fang Te,Liu Shaojun
        Vol. 41, Issue 5, Pages: 132-137(2017) DOI: 10.16578/j.issn.1004.2539.2017.05.027
        摘要：Aiming at the real meshing state of high speed spur gear,the calculation mathematical model of line contact elastohydrodynamic lubrication is established,the model including Reynolds,elasticity and load balance equations etc. By using the numerical method,the friction factor of different meshing positions on the high speed spur gear under the elastohydrodynamic lubrication condition is solved. The thermal boundary conditions on different surfaces of gear teeth are obtained by using the friction and heat transfer theories. The single tooth network model of the high speed spur gear is established by using the combination thermal analysis method based on the Patran and Sinda software,and the steady-state temperature field distribution of the gear tooth is obtained. The steady-state temperature distribution of gear under the experimental condition is obtained by temperature measuring experiment on the gear experiment bench,and the simulation results are compared with the experiment result,and the feasibility of the simulation method is proved.  
        关键词：High speed spur gear;Elastohydrodynamic lubrication;Friction factor;Thermal network method;Steady-state temperature   
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      • Zheng Gang,Zhao Zhengyang,Zhang Yubao
        Vol. 41, Issue 5, Pages: 138-142(2017) DOI: 10.16578/j.issn.1004.2539.2017.05.028
        摘要：In order to solve the problem of gear and bearing high temperature burns of the bevel gear commutator of the stretch reducing mill,the heat balance of the bevel gear commutator is analyzed. The thermal network model is established according to the thermal network. The model for calculating heat source power,thermal resistance and heat transfer coefficients are given. Based on principle of thermal network,the heat transfer network calculation model is established by AMESim,and the static temperature field distribution of bevel gear transmission system of commutator is calculated. The no-load test bench is set up to verify the correctness of the model. The results proved the reliability of commutator under the limit working condition,and some advice for assembling according to the distribution of temperature field is given. It is show that test result are basically agreement with the numerical result.  
        关键词：Stretch reducing mill;Commutator;Heat balance;Thermal network method   
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      • Qin Bo,Wang Zuda,Guo Huili,Sun Guodong,Chen Shuai,Wang Jianguo
        Vol. 41, Issue 5, Pages: 143-147(2017) DOI: 10.16578/j.issn.1004.2539.2017.05.029
        摘要：Aiming at the problem of rolling bearing early fault vibration signals non-stationary and high noise,failure frequency is difficult to extract. A fault diagnosis method of rolling bearings based on the Variational Mode Decomposition（ VMD） and symmetric difference energy operator is proposed. First of all,the rolling bearing vibration signals are decomposed by VMD algorithm,a number of modal components are got. Secondly,according to the maximum kurtosis criterion,the modal component demodulated by symmetric difference energy operator is selected. Finally,a demodulated signal amplitude and frequency information are obtained and the envelope spectrum is calculated. The experimental results show that compared with the traditional energy operator,the proposed method can effectively extract the fault feature,and can restrain the false interference frequency and highlight the fault characteristic frequency,more conducive to roller bearing fault diagnosis.  
        关键词：Variational mode decomposition;Symmetric difference energy operator;Kurtosis;Rolling bearing;Fault diagnosis   
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      • Zhai Cong,Yang Shuncheng,Xiao Xin
        Vol. 41, Issue 5, Pages: 148-152(2017) DOI: 10.16578/j.issn.1004.2539.2017.05.030
        摘要：The structure of the new-type of the planetary reducer with few teeth difference,which is proposed by Xiao Nanping and received the patent for this invention are introduced. The finite element model of this reducer box is established by using the software ANSYS Workbench. The statics analysis is carried out,the changing curve for each actual loading conditions of the reducer box,and the changing curve of the maximum stress and the deformation are obtained,this analysis results can provide the data support for the subsequent structure improvement and weight reduction. The natural frequency and vibration type are obtained by completing the modal analysis of this box,and whether the resonance phenomenon happens can be determined by comparing the natural frequency of this reducer with the meshing frequency and the rotational frequency. It also offers a theoretic reference for the structure optimization design and following research of vibration problems for reducers.  
        关键词：Reducer box;Few teeth difference;ANSYS Workbench;Statics analysis;Modal analysis   
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      • Li Haiqing
        Vol. 41, Issue 5, Pages: 153-160(2017) DOI: 10.16578/j.issn.1004.2539.2017.05.031
        摘要：Taking the reverse gear of DF9S1600 gearbox as study object,by using the advanced computer simulation technology,through the method of the combination of finite element and boundary element,the systematic study of reverse gear is carried out. Based on multi-body dynamics theory,by using SolidWorks software,a solid model gear transmission is built and by using ANSYS software meshing,gear transmission model achieves flexible,the modal analysis is completed. The meshing modal analysis for reverse gear,two shaft reverse gear,reverse gear and the intermediate shaft are carried out by using ANSYS software,the maximum stress is 0. 164 9 MPa,and the equivalent elastic strain is 8. 265 × 10-7mm for two gears meshing. The maximum stress is 0. 481 9 MPa,the maximum equivalent elastic strain is 3. 071 5 × 10-6mm for the intermediate reverse gear shaft. It is full-compliance with the requirements. And according to the test,the effects of reverse gear noise is analyzed respectively from the speed,load and gear manufacturing errors,the structure is improved to achieve the purpose of the reverse gear damping noise reduction.  
        关键词：Automotive transmission;Reverse gear;Noise and vibration;SolidWorks;ANSYS Modal analysis   
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      • Huang Guoqing,Chen Cong,Yu Yapeng
        Vol. 41, Issue 5, Pages: 161-164(2017) DOI: 10.16578/j.issn.1004.2539.2017.05.032
        摘要：In view of the current sanitation vehicle will cause a lot of power loss in operation,according to the actual situations and needs of sanitation vehicles,a two-stage hydro-mechanical continuously variable transmission（ HMCVT） is proposed,and the analysis of speed regulation characteristic and power characteristic is carried out. The results show that it can combine the advantages of input-split transmission and output-split transmission. By using the AMESim software,the physical model of complex HMCVT is built. The simulation analysis of speed regulation characteristic,load characteristic,start characteristic in transmission system and speed regulation characteristics in driving are completed. The simulation results show that the transmission can withstand the impact of shock loads,when changing speed in the start and driving,the displacement ratio adjustment handle should be adjusted slowly to make the stable adjustment come true. It is important to improve the work efficiency of sanitation vehicle.  
        关键词：HMCVT;Sanitation vehicle;AMESim;Simulation   
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      • Li Hongliang,Zhang Xinbin,Chu Jiangwei
        Vol. 41, Issue 5, Pages: 165-169(2017) DOI: 10.16578/j.issn.1004.2539.2017.05.033
        摘要：According to the research situation of electric vehicle braking energy recovery,a new hybrid scheme of flywheel energy storage device coupling to vehicular powertrain is proposed. Three operation modes consist of brake energy recovery mode,storage energy output mode,recovery energy hold mode of flywheel energy storage device during vehicle operation process are presented. The vehicular flywheel energy storage device regenerative braking test rig and experimental system are designed,and the energy recovery rate is regarded as evaluation index to analyze and evaluate the energy recovery effect of flywheel energy storage device. The energy recovery tests under multiple vehicle speed are carried out by taking the rotational kinetic energy of flywheel to simulate the vehicle kinetic energy during braking under different speeds. The experimental results show that energy storage flywheel has energy balance in view of transmission ratio restriction during energy recovery storage process,and the average energy recovery rate is 25. 28%. The developed test rig is able to satisfy the control demand of regenerative braking system from the architecture to the control scheme.  
        关键词：Electric vehicle;Flywheel energy storage;Regenerative brake;Test rig   
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      • Wang Jianguo,Chen Shuai,Zhang Chao
        Vol. 41, Issue 5, Pages: 170-175(2017) DOI: 10.16578/j.issn.1004.2539.2017.05.034
        摘要：In order to extract fault features of rolling bearing precisely and steadily,a method of bearing fault diagnosis,which is based on optimal noise parameters ensemble local mean decomposition（ ELMD） and spectral kurtosis（ SK） is proposed. Firstly,the relative root-mean-square error is introduced to determine the amplitude of the optimal noise. Then,the fault signal is decomposed into a series of narrow band product functions（ PFs） by using optimal noise parameters ELMD method,and the product functions are obtained with having the highest correlation with the original vibration signal as the reconstructed signal. Finally,the method based on spectral kurtosis and envelope analysis is used to deal with the reconstructed signal. The experimental results indicate that the mode mixing can be restrained effectively by the optimal noise parameter ELMD method and fault features of rolling bearing can be extracted accurately by the approach based on optimal noise parameters ELMD and spectral kurtosis.  
        关键词：Optimal noise parameter;ELMD;Spectral Kurtosis;Relative root-mean-square error;Mode mixing   
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      • Liu Kai,Li Yumin,Yang Zhijun,Yin Wenqing
        Vol. 41, Issue 5, Pages: 176-181(2017) DOI: 10.16578/j.issn.1004.2539.2017.05.035
        摘要：Aiming at the research of pure electric power transmission,the single low-power motor has the problems of low power,small speed range which can cause motor damage and the single high-power motor has the problem of large own load,large energy loss and other issues. A differential type parallel coupled input single output power transmission test bench is designed,the relationship between input and output speed and power loss when the load changed under different working modes is studied. The results of simulation test and the test bench test run shows,when the motor reaches steady state operation,the rated power is 0. 49 k W,the average output power is about 0. 482 k W,power loss is less than 10 W,speed range increases 29. 17%,transmission efficiency is greater than 81. 7%,output power is enhanced effectively and also has fine repeatability. The experimental research platform is provided for the further research on the dynamic optimization of the coupling transmission system.  
        关键词：Differential type coupling transmission;Stepless speed regulation;Dynamics simulation platform;Simulation X   
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      • Tan Wei,Xu Ran,Mi Lin,Chen Sheng
        Vol. 41, Issue 5, Pages: 182-187(2017) DOI: 10.16578/j.issn.1004.2539.2017.05.036
        摘要：During the development process of heavy transmission,a cyclic loading fatigue life test is required to carry out in a certain load to verify the reliability of the internal gear,shaft,bearing,box,and the overall system. In order to adapt the needs of high power and big torque fatigue life test of heavy transmission,an electric-closed fatigue life test system based on energy recovery technology of common DC bus is designed.The test system takes industrial control computer and PLC as the centralized control core unit and uses the SIEMENS S120 multi drive variable frequency speed control system to carry on the drive and load to the test transmission. The advanced technologies is integrated into the testing and control system,such as test process management,test automatic process control,multi thread signal monitoring,testing process data automatic storage,etc. The automation level and reliability of the testing work is improved. The test results show that the fatigue life test system is stable,reliable,convenient operation and at high control precision.  
        关键词：Heavy transmission;Fatigue life;Test system;Electric-closed;Testing and control system   
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      • Tan Jun,Gao Defang,Yang Chao
        Vol. 41, Issue 5, Pages: 188-192(2017) DOI: 10.16578/j.issn.1004.2539.2017.05.037
        摘要：To solving the problem that it is difficult to build an accurate solid model of meshing helical gears in ANSYS,a new parameterized approach to building an accurate solid model of meshing helical gear based on APDL is presented. The solid model of helical gear pair is built at the reference position based on the equations of the tooth profile curve equation. Taking the meshing position that helical gear pair has the minimum total length of contact lines as the initial meshing position,the rotational phase from the reference position to the initial meshing position of helical gear pair is determined,the initial solid model of meshing helical gears is built by rotating the helical gear pair based on the rotational phase. The equation of phase change in one contact lines distribution change cycle of meshing helical gears is established,then,the every meshing position of meshing helical gears in one contact lines distribution change cycle can be caught by the control of the meshing phase factor in the equation. The results of numerical experiment show that the meshing solid model of helical gear generated by the presented method has a good geometric precision,which can guarantee that the simulation results is credible.  
        关键词：APDL;Helical gear;Minimum total length of contact line;Meshing phase   
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      • Gui Jiaqing,Wang Guoqing,Chen Weizhen,Zhai Jiaxing,He Cao
        Vol. 41, Issue 5, Pages: 193-197(2017) DOI: 10.16578/j.issn.1004.2539.2017.05.038
        摘要：Aiming at the urgent need of portable,miniaturized recon equipment fits for all kinds of terrain,a four-leg recon robot is designed based on the perspective of bionics. At first,the structures of robot,such as legs,support,shell and other parts are completed after choosing the whole symmetric structure of outside elbow and inside knee. Then,the design and description of its leg support,transmission,shock absorption and joint-driving functions are carried out. At last,the kinematics analysis of the movement of leg joints,robot body and the tip of the leg and the dynamics analysis of jogging gait are carried out through dynamics simulation software,it is proved that this robot could meet the requirement of stability of motion and velocity of recon equipment.  
        关键词：Four-leg robot;Bionic;Recon robot;Gait   
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      • Yang Fan,Wu Heli,Luo Chenhui
        Vol. 41, Issue 5, Pages: 198-203(2017) DOI: 10.16578/j.issn.1004.2539.2017.05.039
        摘要：Aiming at the wheel-legged type obstacle robot,a novel metamorphic wheel for wheel-legged obstacle climbing robot（ WOCR） is designed to make the robot to switch between wheels and legs. Firstly,the working principle of the metamorphic wheel is introduced and the three dimension model is established in Pro/E. Secondly,the deploy angle range of the wheel is analyzed in theory. The kinematic simulation for the deploy progress is carried out in ADAMS to verify the theoretical analysis result. The simulation result is similar to the theoretical result,which indicates the wheel structure is viability. At last,the obstacle climbing performance of the wheel is analyzed and the result shows the height of obstacle climbing after deploying the wheel is 2. 2 times than that before deploying and succeed in climbing a 200 mm high step. These indicate that the wheel possessed high capacity of obstacle climbing and can be applied in WOCR.  
        关键词：Wheel-legged type robot;Obstacle climbing;Metamorphic;Kinematic simulation   
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      • Shi Yanhui,Feng Guangjun,Zhao Kai,Yu Dingyue,Wang Mingcheng
        Vol. 41, Issue 5, Pages: 204-208(2017) DOI: 10.16578/j.issn.1004.2539.2017.05.040
        摘要：The failure of friction plate and steel disc in the brake of an automatic transmission is analyzed profoundly. The wave shape deformation of steel disc is caused by the thermal load distributing in its inner radius area. With checking the design,assemble,manufacture,heat-treatment and part quality,the main causes of failure is concerned with little thickness of steel disc,unreasonable design of supporting structure and large difference in characteristics of wave spring. The lifetime of the brake is markedly improved by optimizing the thickness of steel disc with the software ANSYS,filtering and using wave spring in groups. For finishing the durability test of an automatic transmission on the bench,the fault for the brake is effectively solved.  
        关键词：Brake;Shape deformation of steel disc;Finite element analysis;Structure improvement   
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