最新刊期
      期 4 ， 2020
      本期电子书

        Theory·Reserach

      • Yu Lianqing,Zeng Xiangkuo,Li Hongjun,Wu Zijun,Meng Yunhong
        Vol. 44, Issue 4, Pages: 1-7(2020) DOI: 10.16578/j.issn.1004.2539.2020.04.001
        摘要：In order to reduce the energy consumption of a robot of the closed five-bow-shaped-bar linkage rolling along a straight line，the effect of the maximum rolling acceleration under the constant potential energy rolling strategy and the variable potential energy rolling strategy on the total energy consumption of the system is studied.A modified trapezoidal curve with adjustable maximum rolling acceleration is adopted as the rolling angle acceleration law of the system，and the joint trajectories is obtained by using the rolling strategies of constant potential energy and variable potential energy respectively.On this basis，considering the viscous friction in the joints，the Lagrange equation with dissipation function is used to solve inverse dynamics solution，and the total energy consumption of the system is calculated by the energy consumption equation.The calculation shows that the total energy consumption of the system decreases first and then increases with the increase of the maximum rolling acceleration，and using the constant potential energy rolling strategy is beneficial to reducing the total energy consumption of the system.Finally，the correctness of theoretical analysis is verified by Adams simulation.  
        关键词：Closed five-bow-shaped-bar   
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        发布时间：2022-10-20
      • Ma Dengqiu,Ye Zhenhuan,An Yu,Wu Tingqiang,Chen Fangzhou
        Vol. 44, Issue 4, Pages: 8-16(2020) DOI: 10.16578/j.issn.1004.2539.2020.04.002
        摘要：In order to study the transmission error of the cylindrical gear with arcuate tooth trace，a torsional vibration model of the cylindrical gear with arcuate tooth trace transmission system is proposed，and a dynamics model is established based on 3D model.The influence of tooth width，tooth line radius，load and rotation speed on the transmission error is analyzed.The results show that，the transmission error fluctuates periodically around 0 when the structure parameters and working conditions are different； the transmission error amplitude decreases first and then increases with the increase of the tooth width； the transmission error amplitude changes in shape of “W” with the increase of the tooth line radius，that is，it first decreases and then increases with the increase of the tooth line radius，and then first decreases and then increases with the increase of the tooth line radius； the transmission error amplitude increases with the increase of load and rotating speed.The results provide the theoretical basis for the noise reduction and lubrication，fault diagnosis and gear tooth geometric modification of the cylindrical gear with arcuate tooth trace.  
        关键词：Cylindrical gear with arcuate tooth trace   
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        发布时间：2022-10-20
      • Zhang Chunyan,Liu Xiangyu,Ni Cong,Lu Chenhui
        Vol. 44, Issue 4, Pages: 17-25(2020) DOI: 10.16578/j.issn.1004.2539.2020.04.003
        摘要：Aiming at the functional requirements of mobile mechanisms with multiple modes，a design scheme based on single-loop kinematic chains is proposed.Firstly，according to the single-loop freedom formula，the conditions satisfying the single-loop and can be active are determined，and the combination relationships among the order of the constrained screw system，the number of bars，the number of kinematic pairs and the degree of freedom of the single-loop kinematic chains are obtained.Secondly，based on the screw theory，the geometric conditions of the axis of kinematic pairs under different constrained screw orders are obtained by using the virtual work principle.Taking the R and P pairs as the design units，all the possible combinations of the single-loop kinematic chains under different degrees of freedom are enumerated，and then the constructed single-loop kinematic chains are used as the body or branch to construct a kind of mobile mechanisms with multiple modes.Finally，the steps of type synthesis of mobile mechanisms with multiple modes and some design cases are given，which verifies the feasibility and practicability of the proposed design theory and design method.  
        关键词：Single-loop kinematic chains;Screw theory;Mobile mechanism with multiple modes;Type synthesis;Degree of freedom   
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        发布时间：2022-10-20
      • Hu Li,Tang Senquan,Yang Qiliang,Wang Bo
        Vol. 44, Issue 4, Pages: 26-31(2020) DOI: 10.16578/j.issn.1004.2539.2020.04.004
        摘要：In order to achieve a heavy commercial vehicle gearbox lightweight，the gray cast iron shell is replaced by aluminum alloy shell.Firstly，the finite element model is verified by modal test.Then the dynamic loads of the five bearings of the shell are obtained by the method of multi-body dynamics，and the strain energy of the shell is obtained based on the static analysis.Then，the mathematical model of four influencing factors on the mass of plate and shell is established to determine the order of the influence of each influencing factor on the mass of plate and shell.The results show that the strength and stiffness of the lightweight shell meet the requirements.  
        关键词：Gearbox   
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        发布时间：2022-10-20
      • Chen Xinwen,Zhu Min,Wang Qiliang
        Vol. 44, Issue 4, Pages: 32-37(2020) DOI: 10.16578/j.issn.1004.2539.2020.04.005
        摘要：RV reducer plays a dominant role in the field of robots because of its advantages of high accuracy，high efficiency and small size.Cycloid wheel，as the key component of RV reducer，directly affects the performance of the transmission system of RV reducer.In order to improve the meshing performance of cycloidal pin wheel，the radius of needle teeth is constructed as an exponential function of the rotation angle for modification，and the profile equation after modification is established.The tooth profile curve and curvature radius of cycloidal wheel before and after modification are compared with examples.The contact pressure and transmission error between cycloid wheel and pin teeth are calculated when the crank rotates from 0°~360°.The exponential function modification maintains the theoretical tooth profile curve in the working section of cycloidal gear，overcomes the problem of large modification amount in traditional modification method，ensures the meshing stability，and improves the strength and transmission accuracy of cycloidal wheel.  
        关键词：RV reducer   
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        发布时间：2022-10-20
      • Shi Yafei,Zhang Li,Liu Zixuan,Lü Yiping
        Vol. 44, Issue 4, Pages: 38-44(2020) DOI: 10.16578/j.issn.1004.2539.2020.04.006
        摘要：In order to improve the safety and accuracy of the manipulator in dynamic obstacle avoidance，an artificial potential field collision avoidance algorithm based on velocity field is proposed.Firstly，the attracted velocity field is established to obtain the trajectory of the manipulator tracking the moving target.Then，the repulsive velocity field is constructed by combining the danger field method，so that the manipulator can realize dynamic obstacle avoidance and safety assessment in the multi-obstacle environment.Finally，aiming at the problem that the artificial potential field method is easy to fall into the local minimum，the method of adding additional velocity in the normal direction of sum velocity is proposed to escape the local minimum value.The algorithm is validated by using Matlab Robotics Tool.The results show that the artificial potential field method based on velocity field can realize dynamic target tracking，move obstacle avoidance and safety evaluation of the manipulator.  
        关键词：Dynamic obstacle avoidance   
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        发布时间：2022-10-20
      • Song Wei,Xu Yong,Liu Yong,Lü Yeping,Liang Zheng
        Vol. 44, Issue 4, Pages: 45-53(2020) DOI: 10.16578/j.issn.1004.2539.2020.04.007
        摘要：A new bifurcated single-loop closed-chain configuration URRC is proposed.This single-loop closed-chain has two degrees of freedom modes.A bifurcated parallel mechanism is obtained by combining series branch PRRP with bifurcated single-loop closed chain to form a hybrid branch chain and connecting the moving platform and fixed platform with three parallel branches.Through the combination of different modes of single-loop closed-chain，the parallel mechanisms of 3T3R，3T，2R1TⅠ，2R1TⅡ and 1R2T with five DOF modes are obtained.The correctness of the five DOF modes of the bifurcated parallel mechanism and the rationality of driving selection are proved by screw theory analysis.  
        关键词：Bifurcation   
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        发布时间：2022-10-20

        Design· Calculation

      • Wang Quan,Zeng Lilei,Qin Zhengzheng
        Vol. 44, Issue 4, Pages: 54-60(2020) DOI: 10.16578/j.issn.1004.2539.2020.04.008
        摘要：In view of the fact that the influence of cycloid gear profile modification on contact force is not taken into account in the structural design of RV reducer，a multi-objective optimization design method for the structure of RV reducer considering cycloid gear profile modification is proposed.Combining the theory of tooth profile modification with the calculation of contact stress of cycloidal gear，considering the factors of volume，efficiency and contact stress，an optimization mathematical model with small volume，high efficiency and low contact stress of cycloidal gear as multi-objective function is established.The solution is carried out by using NSGA-II algorithm，and compared with single-objective optimization method.The results show that compared with the original design，the volume of RV reducer decreases by 21.24%，the efficiency increases by 2.03%，and the contact stress of cycloid wheel decreases by 20.26%.Meanwhile，the multi-objective optimization method has higher comprehensive performance than the single-objective optimization method.  
        关键词：RV reducer   
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        发布时间：2022-10-20
      • Sun Wei,Li Anming,Kong Jianyi,Zuo Huiyan,Wei Sijia
        Vol. 44, Issue 4, Pages: 61-66(2020) DOI: 10.16578/j.issn.1004.2539.2020.04.009
        摘要：The isomorphism identification is one of the indispensable processes in structure synthesis of planetary gear train.It is of great significance for the creation of novel planetary gear train with excellent transmission characteristics.A new method for identifying isomorphism of planetary gear train based on improved Hamming number is proposed.Firstly，a new method for describing the topological diagram of planetary gear train by improved link adjacency matrix is proposed.This matrix contains all the information of the topological structure of planetary gear train and has the uniqueness of description.Then，the basic feature of planetary gear train is represented by the feature code，which is the necessary condition for isomorphism.Then，the principle of improved Hamming number is defined，and the Hamming code is obtained.By distinguishing whether the structural constants of the feature code and the Hamming code are equal，the isomorphism of the planetary gear train is identified.Finally，the validity and reliability of the method are verified by examples.  
        关键词：Planetary gear train   
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        发布时间：2022-10-20
      • Li Zhipeng,Luo Yufeng,Shi Zhixin,Xie Dongfu,Li Chengwu
        Vol. 44, Issue 4, Pages: 67-73(2020) DOI: 10.16578/j.issn.1004.2539.2020.04.010
        摘要：As for the problem that the efficiency of picking of naval orange is low，a kind of picking actuator with surrounding and swallowing is designed，whose structure of implement is mainly consisted of multiplex slider rocker mechanism.Firstly，structure sketch of that installation is completed by referring to the operating principle of actuator designed，and the analysis of kinematics and dynamics is carried out.Then，the mathematical model of objective function is established based on the least consuming time，the optimized size of related structure are got by utilizing the Matlab software.Finally，based on the obtained dimension，the 3D model of end-effector is achieved，kinematics simulation is carried out by applying Adams software，the rationality and feasibility of design of actuator for naval orange harvesting is verified，and the theoretical support for the practical picking experiment is provided.  
        关键词：Naval orange   
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        发布时间：2022-10-20
      • Jia Liangfei,Ma Chaofeng,Liu Kai
        Vol. 44, Issue 4, Pages: 74-79(2020) DOI: 10.16578/j.issn.1004.2539.2020.04.011
        摘要：Aiming at the current rock burst problems encountered in hard rock excavation construction，a set of six-degree-of-freedom automatic excavation equipment which can replace the current artificial slag and can work well in a narrow working space is designed.The specific design is on the basis of the traditional excavating machine，two telescopic arm structures and a swing arm structure are added，and each rod length and each joint variable are set by kinematically modeling the mechanical arm.The design overcomes the problem of the small amount of operable space and the protection of the supporting I-beam for the pre-supported tunnel，and expands the working space of the conventional excavation equipment in a narrow space.The overall structure of the excavation equipment and the kinematics modeling process are expounded.By using the characteristics of Monte Carlo method in random number application，the workspace of this device is simulated.At the same time，the joint parameters are reversed and verified.The results are in line with the expected joint operating range.The slag cleaning device can improve the working efficiency of cleaning the gravel caused by rock burst，and can reduce the construction cost of the hard rock tunneling.  
        关键词：Rock burst   
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        发布时间：2022-10-20
      • Wang Zhiqin,Wang Xiaosun,Wang Shiru,Wu Shijing
        Vol. 44, Issue 4, Pages: 80-84(2020) DOI: 10.16578/j.issn.1004.2539.2020.04.012
        摘要：In order to explore the influence of gear modification on the meshing stiffness，two different methods are used to calculate the gear meshing stiffness.First，the gear is parametrically modeled by Pro/E secondary development，and the gear model is imported into Abaqus software for finite element simulation calculation.The time-varying mesh stiffness curve is obtained through data processing.Second is based on the energy method of the analytical method to calculate the time-varying mesh stiffness curve.The results show that within a certain range，the coincidence degree of gear meshing decreases with the increase of gear displacement coefficient and the average meshing stiffness of the gear decreases as the gear displacement coefficient increases.  
        关键词：Gear modification   
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        发布时间：2022-10-20
      • Zhang Kai,Han Yingge,Li Baokun,Zhang Jie
        Vol. 44, Issue 4, Pages: 85-89(2020) DOI: 10.16578/j.issn.1004.2539.2020.04.013
        摘要：A design method of compliant gripper based on pseudo rigid body model is presented.A compliant clamping mechanism with constant force characteristics is constructed based on the additional spring double-slide four-bar mechanism.The mechanism position analysis model is established and the kinematic statics equation is constructed by using the principle of virtual work.The influence of spring stiffness on the output characteristics of the mechanism is analyzed，and a compliant clamping mechanism design method with constant force characteristics is obtained.Based on the pseudo rigid body model，the additional spring is replaced by a flexible module to obtain a new type of compliant constant force mechanism.The feasibility of establishing compliant constant force mechanism is verified by finite element analysis software.Finally，a new type of compliant constant force gripper with a symmetrical structure is constructed.The design method of the compliant constant force gripper can also be applied to the non-linear stiffness characteristic compliant mechanism design included other types of additional spring mechanisms.  
        关键词：Compliant mechanism   
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        发布时间：2022-10-20
      • Guo Ruiqin,Chen Song,Huang Junbo
        Vol. 44, Issue 4, Pages: 90-94(2020) DOI: 10.16578/j.issn.1004.2539.2020.04.014
        摘要：The lamp lens is an important concentrator in the lamp assembly.The disadvantages of the traditional loading and unloading process of the hot forming process of lamp lens are analyzed.A lightweight and large-stroke loading and unloading manipulator is put forward based on the kinematic analysis of the glass rod.Introduced KaDang mechanism to realize the large stroke motion of the manipulator； added slider-crank mechanism to effectively reduce the space size of manipulator.The mutual movements among the components of KaDang mechanism is used to drive the combined mechanism，which can effectively reduce the number of drives and improve the dynamics performance of manipulator.At last，by using the virtual prototype，the kinematic simulation is carried out and the moving trail of manipulator is got，the correctness and superiority of the scheme are verified.  
        关键词：Manipulator;Combined mechanism;KaDang mechanism;Simulation analysis   
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        发布时间：2022-10-20

        Test·Analysis

      • Huang Hongxin,Zhao Xingfu,Wang Zengqiang,Yu Guangbin
        Vol. 44, Issue 4, Pages: 95-100(2020) DOI: 10.16578/j.issn.1004.2539.2020.04.015
        摘要：Aiming at the problems that clearance is difficult to modify and operation stability is poor of pinion and rack used in the large machine tool carrier feeding device，the beveloid pinion and rack which can modify clearance axially is proposed.The finite element analysis of the changes of variables such as static transmission error，uniform degree of contact stress，contact force are carried out when considering axial clearance changes.The results show that the influences of axial clearance changes to variables depend on torques directly，the influences when torque is 50 N∙m or 100 N∙m from large to small are in the order of uniform degree of contact stress，static transmission error，contact force.The influences when torque is 200 N∙m or 400 N∙m from large to small are in the order of static transmission error，uniform degree of contact stress，contact force.  
        关键词：Beveloid pinion and rack   
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        发布时间：2022-10-20
      • Shi Enbing,Su Jianxin,Zhang Lifang,Deng Xiaozhong,Ren Xiaozhong,Cheng Chen
        Vol. 44, Issue 4, Pages: 101-106(2020) DOI: 10.16578/j.issn.1004.2539.2020.04.016
        摘要：The cycloid gear multi-tooth form grinding is a gear finishing process，which can finish the processing of three tooth grooves at same time.In the process of high-speed grinding，high temperature will arise on the gear surface instantaneously，which may cause tooth surface burn.The temperature gradient formed by grinding temperature field will cause residual stress on the tooth surface，and the metallographic structure of cycloid gear tooth surface will change，affecting the grinding accuracy of the gear.The finite element method is used to simulate the temperature field of cycloid gear multi-tooth form grinding，and then the thermo-mechanical coupling analysis method is used to obtain the numerical simulation nephogram of the temperature field and thermal stress of cycloid gear form grinding.Through the analysis of the main stress of the grinding area，it can be seen that the stress is mainly concentrated at the grinding center near the root of the tooth，and the grinding area presents hot-pressing stress.In the ground area，the hot-pressing stress is converted into thermal tensile stress and gradually forms residual tensile stress，and the node stress also changes correspondingly with the change of grinding process parameters.The conclusion has certain research significance for predicting the distribution of temperature and thermal stress field during multi-tooth form grinding and reasonably selecting grinding process parameters.  
        关键词：Cycloid gear   
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      • Wang Xiaopeng,Liu Shijun
        Vol. 44, Issue 4, Pages: 107-112(2020) DOI: 10.16578/j.issn.1004.2539.2020.04.017
        摘要：The simulation model of the diaphragm disc sun-gear shaft of high-speed planetary gearbox is established.Based on the design principle of the floating structure of sun-gear shaft in planetary gearbox，three conditions including free-free，simple support-axial and simple support-fixed support are drawn up.The natural frequency and traveling wave vibration of sun-gear shaft were investigated，and the corresponding diagrams of mode of vibration and Campbell figure are drawn later.A gearbox test bench is built for experimental analysis.The result shows that when the main mode of sun-gear shaft with deformation of gear teeth resonates with one-fold frequency，the excitation force has largest amplitude，the two and three times followed.The vibration forms of teeth are torsional vibration，traveling wave vibration and bending vibration.A wide range of resonance points is produced between diaphragm or barrel shaft and multiple frequency of shaft.The resonance response is smaller by the greater multiple frequency of shaft.The experimental shows that during the process of increasing the speed from zero to working speed，the vibration value fluctuates significantly and then decreases to stable quickly，which indicates that the vibration of system is not expanded by exciting force and the influence on system stability is smaller.The geometric design of sun-gear shaft has a certain rationality and applicability.  
        关键词：Sun-gear shaft   
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        发布时间：2022-10-20
      • Liu Lei,Zhu Xinglong,Yin Junyao
        Vol. 44, Issue 4, Pages: 113-119(2020) DOI: 10.16578/j.issn.1004.2539.2020.04.018
        摘要：In the research of robotic manipulator，trajectory planning and dynamics analysis are very important.In view of the structural characteristics of the four-DOF manipulator for electro test and installation of ground wire，the dynamics model is established by Lagrange method and the dynamics analysis is carried out.On the basis of fourth order polynomial，the non-impact trajectory planning is proposed.The Simulink module in Matlab is used to get the curve of the moment and force of each joint changing with time.Using Adams software to carry out dynamics simulation，the moment and force curve of each joint are got，and compare with the curve calculated by Simulink，the correctness of dynamic analysis are confirmed，the foundation for the next structural design and system control is laid.  
        关键词：Four-DOF manipulator   
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        发布时间：2022-10-20
      • Fan Naize,Li Bowen,Xu Dawei,Li Liangyu,Liu Jie
        Vol. 44, Issue 4, Pages: 120-124(2020) DOI: 10.16578/j.issn.1004.2539.2020.04.019
        摘要：In order to optimize the design method of the gear transmission system for urban rail transit trains in China，the mechanical strength check of the gear transmission system for urban rail trains in actual operation is performed.The loading scheme is formulated according to the design input.The gear transmission system model is created by using the 3D modeling software SolidWorks，and it is imported into the finite element analysis software Abaqus for finite element calculation.The calculation results show that the mechanical strength of the gearbox meets the requirements of train operation，and the type test results prove the credibility of the finite element calculation method.The research work has important reference value for the application of the finite element analysis method in the development and design of urban rail train gearbox.  
        关键词：Urban rail train   
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        发布时间：2022-10-20
      • He Zhiwei,Duan Jianzhong,Li Youzhi
        Vol. 44, Issue 4, Pages: 125-131(2020) DOI: 10.16578/j.issn.1004.2539.2020.04.020
        摘要：The feasibility of machining double circular arc profile spiral bevel gear by numerical control forming grinding method is verified by VERICUT machining simulation.The tool path of the bevel gear and the tooth surface equation of the circular arc profile spiral bevel gear are studied，the axial cutting shape of the forming grinding wheel is obtained by the contact condition formula of the grinding surface and the tooth surface of the grinding wheel.Then，the selection criteria of the number of axes of the CNC forming gear grinding machine are proposed，and the models of the machine tool，forming grinding wheel and blank are established in VERICUT.Finally，the machining simulation of the double circular arc profile spiral bevel gear proves that the CNC forming grinding method can be used to process such gears，technical support for the application of CNC forming grinding on bevel gears.  
          
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        发布时间：2022-10-20
      • Shi Chongshi,Yan Chenxi,Huang Mingyu,Ni Hongjun
        Vol. 44, Issue 4, Pages: 132-138(2020) DOI: 10.16578/j.issn.1004.2539.2020.04.021
        摘要：The oil pump equipped with E-CVT has the function of providing cooling lubrication flow and brake flow.In order to study the use characteristics of cycloidal pump as the power source of E-CVT hydraulic system，the mathematical model is established based on theoretical analysis，and the multi-domain simulation model including signal domain，hydraulic domain and mechanical domain is built by AMESim platform.The model is verified by experimental data.Based on the simulation model，the effects of oil temperature，rotation speed and load pressure on volumetric efficiency and flow characteristics are dynamically studied.At the same time，the low oil temperature start failure of the oil pump in the E-CVT is predicted by the model connection filter，oil sump and pipeline，which provides a reference for the subsequent fuel pump motor related strategy design.  
        关键词：Cycloidal pump   
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        发布时间：2022-10-20

        Development·Application

      • Zhong Qi,Han Lixi,LI Junwen,Zhong Peipei
        Vol. 44, Issue 4, Pages: 139-146(2020) DOI: 10.16578/j.issn.1004.2539.2020.04.022
        摘要：Gears are important parts in mechanical transmission and are widely used.When the gear design is completed，the gear detection parameters need to be determined according to accuracy grade and usage requirements.In general，the look-up table method is used，but according to the latest standards，some parameters need to be calculated.So，it can be seen that the query and calculation of gear parameters are very cumbersome，which brings inconvenience to the design work.Using the Delphi platform to develop a system for quickly querying different types of gear detection parameters，the system provides parameter query for two major types of gears，including cylindrical gears and bevel gears.Through inputting the basic design parameters，the parameters can be automatically and quickly completed.The result can be displayed in the system interface or formed in Excel file to designers.It can greatly improve the accuracy and design efficiency of the gear detection parameter query.Through many engineering design practices，the system is reliable and efficient，and is of great significance to the system design of other related complex computational problems in mechanical design and manufacturing.  
        关键词：Gear   
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        发布时间：2022-10-20
      • Liu Yinchuan,Ding Hua,Li Ning
        Vol. 44, Issue 4, Pages: 147-151(2020) DOI: 10.16578/j.issn.1004.2539.2020.04.023
        摘要：Due to the problems of complicated process，low accuracy and efficiency of the existing wear measurement method of scraper conveyor sprocket tooth，a sprocket tooth sequence images acquisition device is designed based on shape from focus.By controlling the movement module of the device，the axial and circumferential alignment between an industrial camera and a sprocket tooth is realized，then control the sprocket tooth radial stepping motor every step，collect a image，repeat the cycle 100 times.And the sequence images acquisition of the sprocket tooth is completed.Test results show that sequence images acquisition device can quickly acquire clear sequence images of the sprocket tooth and provide hardware support and image data samples for the sprocket wear measurement of the scraper conveyor.  
        关键词：Sprocket tooth   
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        发布时间：2022-10-20
      • Zhang Ning,Wei Xiuye,Xu Jinhong
        Vol. 44, Issue 4, Pages: 152-157(2020) DOI: 10.16578/j.issn.1004.2539.2020.04.024
        摘要：In order to solve the difficult problem of early fault feature extraction of planetary gearbox and consider that the planetary gearbox vibration signal is coupling and nonlinear，and the signal has multiple transmission paths，a planetary gearbox fault diagnosis method based on Local Mean Decomposition（LMD） and Sample Entropy and Extreme Learning Machine（ELM） is proposed.Firstly，the vibration signal is adaptively decomposed into a plurality of PF components by LMD，and the first four PF components including the main fault information are selected in combination with the correlation coefficient and the variance contribution rate.Secondly，the Sample Entropy of the signal is calculated to form a feature vector.Finally，the feature vector is input into ELM for fault classification.Experiments are carried out on the planetary gearbox test bench，compared with the probabilistic neural network classification algorithm，and compared with the feature vector based on Singular Value Decomposition （SVD）.The results verify the effectiveness of the proposed method.  
        关键词：Planetary gearbox   
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        发布时间：2022-10-20
      • Bie Fengfeng,Gu Sheng,Pang Mingjun,Guo Yue,Yang Gang
        Vol. 44, Issue 4, Pages: 158-164(2020) DOI: 10.16578/j.issn.1004.2539.2020.04.025
        摘要：Aiming at the feature extraction for the rolling bearing，a fault diagnosis method based on CEEMDAN adaptive denoising combining with DRT （demodulated resonance technology） is presented.Firstly，the original vibration signal is decomposed into several components with CEEMDAN adaptively，and the reconstruction is performed on regarding the correlation coefficient method to realize the purpose of eliminating noise.Then，the reconstructed signal is analyzed by spectral kurtosisto to achieve the frequency band of the impact component.Based on this，a bandpass filter is designed for the reconstructed signal.Finally，the filtered signals are analyzed by energy Hilbert envelope spectrum.With reference on the characteristic frequency of the rolling bearing failure modes，the pattern of the bearing is recognized.The effectiveness of the method is demonstrated by dynamics simulation and rolling bearing experiments.The result shows that the method can be used to identify the fault information of the rolling bearings effectively.  
        关键词：Rolling bearing   
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      • Zhao Xiaotao,Sun Huer,Yao Wei
        Vol. 44, Issue 4, Pages: 165-169(2020) DOI: 10.16578/j.issn.1004.2539.2020.04.026
        摘要：To solve the problem that it is difficult to extract the weak fault features of rolling bearing effectively under the interference of strong background noise，a method of extracting the weak fault features based on the combination of maximum second-order cyclostationary blind deconvolution （CYCBD） and envelope spectrum is proposed.Firstly，a reasonable cycle frequency set is set by the fault characteristic frequency，and CYCBD is used to reduce the noise of weak fault impulse signal with strong noise，so as to enhance the periodic impulse component in the signal.Then，the noise reduction signal is analyzed by Hilbert envelope spectrum to identify the fault characteristic frequency.The simulation and experimental results show that the method can effectively extract the weak fault features submerged by strong noise.  
        关键词：Rolling bearing;Maximum second-order cyclostationarity blind deconvolution;Weak fault;Feature extraction   
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        发布时间：2022-10-20

        Review

      • Zhang Yanjun,Xu Yong,Ma Xiaoyan,Li Wenbo,Zhang Jianfeng,Song Aiping
        Vol. 44, Issue 4, Pages: 170-176(2020) DOI: 10.16578/j.issn.1004.2539.2020.04.027
        摘要：Worm drive has a large transmission ratio，compact structure and stable transmission，thus，it has been widely used in the field of mechanical manufacturing.Bronze is the most common and widespread worm gear material in the worm drive.In order to solve the problems of poor wear resistance，low fatigue strength and scuffing of bronze worm gear，the research of replacement materials bronze worm gear has attracted increasing attention.The common metal materials of bronze worm gear and the research progress concerning alternative materials of bronze worm gear are reviewed.Steel worm gear，cast iron worm gear，zinc aluminum alloy worm gear，and plastic worm gear in domestic and overseas published literatures are mainly discussed.Finally，expectations about materials，surface engineering technology and coating preparation are proposed in respect of current research.  
        关键词：Worm drive   
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