最新刊期
      期 2 ， 2015
      • Tian Hao,Yu Yueqing
        Vol. 39, Issue 2, Pages: 1-4(2015) DOI: 10.16578/j.issn.1004.2539.2015.02.042
        摘要：The research on motion planning of the parallel robot with compliant joints is carried out.According to the characteristics of compliant joint,the system analysis model is built.The dynamics equation is obtained based on Lagrange method.To guarantee the smooth running of the system and suppress the rate of speed of inertia force,the trapezoidal and S-curve velocity planning method are used for motion planning.The motion planning algorithms of linear and circular trajectories are given.The simulation results show that the motion planning method is effective.  
        关键词：Compliant joint;Parallel robot;Dynamics;Motion planning   
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        发布时间：2022-10-20
      • Wang Kai,He Lidong,Xing Jian,Hu Hangling
        Vol. 39, Issue 2, Pages: 5-7(2015) DOI: 10.16578/j.issn.1004.2539.2015.02.006
        摘要：In order to solve the problem that gearbox vibration and noise are too large,aparallel shafts system bench with gears is established to simulate the gearbox.One self-designed magnetorheological damper is installed at each shaft.Different working conditions are set to study the influences at different operating current of dampers.The acceleration sensor is used to measure the gearbox vibration in experiments,the influence of magneto-rheological damper on gear transmission shafting vibration is studied from the gearbox body vibration.The results show that the damper can reduce the vibration of the gearbox body,and the decreasing amplitude is rising with the damper working current increases.The decline of the vertical vibration is up to 30%,and the decline of the horizontal vibration is up to 40%.Through the analysis of time and frequency domain waveform,it is found that the04 000 Hz frequency component of vibration can be reduced by using magneto-rheological damper,especially the vibration amplitude of lower 1000 Hz component can be reduced by 60%,the vibration amplitude of around 3000 Hz component can be reduced by 80%.Application of magneto-rheological damper can change current to adapt to different conditions by monitoring the gear box vibration damper,which can keep the vibration of the gearbox low.  
        关键词：Magneto-rheological damper;Gear;Damping vibration attenuation;Parallel shafting   
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      • Wang Chunhua,Fan Changda,Cheng Jiangtao,Tang Lisong
        Vol. 39, Issue 2, Pages: 8-11(2015) DOI: 10.16578/j.issn.1004.2539.2015.02.022
        摘要：The finite element model of belt conveyor drum is established.And the stress and deformation of with and without reinforcement ring and different structures of reinforcing ring are analyzed by using finite element analysis software ANSYS.The corresponding relation between the different structures of reinforcing ring and the maximum deformation of drive drum is obtained after modeling and calculation.And the function relation between different structures of reinforcing ring and maximum displacement is fitted by using MATLAB,and the structure of reinforcing ring with minimum displacement can be selected according to the function.The theoretical basis and thought are provided for the standardized design of reinforcing ring of belt conveyor drive drum.  
        关键词：ANSYS;Belt conveyor;Drive drum;Reinforcing ring;Matlab   
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        发布时间：2022-10-20
      • Qiu Huansong,Yuan Jiehong,Li Yuan
        Vol. 39, Issue 2, Pages: 12-15(2015) DOI: 10.16578/j.issn.1004.2539.2015.02.008
        摘要：Considering of time-varying meshing damping and time-varying meshing stiffness and static transfer errors,the torsional dynamics model of spiral bevel gear pair with backlash is established.The Runge-Kutta numerical integral method is then used to solve the model.The dynamic response of gear system is acquired under the influence of time-varying mesh damping and gear backlash.The results show that the non-linear vibration characteristics of gear system are affected obviously by time-varying mesh damping and gear backlash.With the change of meshing frequency and backlash,the system amplitude could produce evident fluctuation in a certain range and the non-linear characteristics are observed,such as periodic motion,quasi periodic motion and chaotic motion as well as bifurcation and jumping phenomenon etc.  
        关键词：Spiral bevel gear;Time-varying meshing damping;Time-varying meshing stiffness;Gear backlash;Dynamic response   
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        发布时间：2022-10-20
      • Duan Mingde,Wei Baolei,You Yanwei
        Vol. 39, Issue 2, Pages: 16-18(2015) DOI: 10.16578/j.issn.1004.2539.2015.02.009
        摘要：For the difficulty of predicting the life of gear,an unbiased Grey GM（1,1）model is established based on the original data,and it is modified by using residual error model.The development trend of gear life is analyzed,the predicting accuracy is improved by introducing Markov optimization based on unbiased Grey GM（1,1）modification model.Comparing with the predicted value and the actual value,the predicting accuracy of gear life is improved from 87.06%to 90.09%.The result shows that the combined model has a better predicting precision and practicality within a period in the case of few data and poor information,it provides an available method for predicting the life of gear.  
        关键词：Markov optimization;Residual error;Gear;Life prediction   
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        发布时间：2022-10-20
      • Su Xunwen,Wang Shaoping
        Vol. 39, Issue 2, Pages: 19-24(2015) DOI: 10.16578/j.issn.1004.2539.2015.02.010
        摘要：Because there are backlash friction and time-varying stiffness exist in gear transmission,the characteristics of gear pair has strong nonlinearity.When a gear has faults such as pitting,spalling and tooth breakage,there are often some nonlinear characteristics as super-harmonics or sub-harmonics along with vibration signal.These characteristics will bring some difficulty for fault diagnosis,so it is necessary to study the mechanism of nonlinear vibration under different gear fault degree.The Fourier expression is used to describe time-varying stiffness,and the problem of piecewise function stiffness mutation is avoided to some extent.The gear fault degree factor is used to depict gear fault degree,a nonlinear dynamics model for gear fault degree is established.And the experimental platform of the gear fault evolution is built.The simulation results and experimental results show that,with certain friction coefficient and rotating speed,the nonlinear vibration has direct relationship with rotating speed and gear friction coefficient and has no direct relationship with fault degree.  
        关键词：Gear;Nonlinearity;Dynamics;Fault evolution;Fault diagnosis   
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        发布时间：2022-10-20
      • Li Hanwu
        Vol. 39, Issue 2, Pages: 25-30(2015) DOI: 10.16578/j.issn.1004.2539.2015.02.016
        摘要：The performance index to improve the transmission efficiency is discussed,the application prospect of the a new design in mechanical transmission field-ball worm pair with the rolling balls as meshing tooth is analyzed and compared on the technical.The transmission principle of the mechanism is analyzed,and the basic formula of the mechanism design calculation is proposed,and it is showed through the design example for this kind of ball worm pair.  
        关键词：Ball worm pair;Transmission efficiency;Meshing;Envelope line   
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        发布时间：2022-10-20
      • Song Limin
        Vol. 39, Issue 2, Pages: 31-34(2015) DOI: 10.16578/j.issn.1004.2539.2015.02.038
        摘要：For the long process of automobile engine braking capacity and speed brake assist stability poor problems,by introducing multi pieces metal belt drive into vehicle transmission system,the numerical model of a new type multi pieces metal belt vehicle transmission system is established,under the long downhill course conditions,the multi pieces metal belt drive engine brake control strategy,its feasibility and the influence law on braking characteristic are studied.  
        关键词：Multi pieces metal belt;Engine;Brake;Control strategy   
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        发布时间：2022-10-20
      • Chen Feng
        Vol. 39, Issue 2, Pages: 35-39(2015) DOI: 10.16578/j.issn.1004.2539.2015.02.040
        摘要：To further study the property of heavy-duty construction machinery operation,the flexible work surface and the front and rear axle torque distribution are introduced,the construction machinery mathematical model of four-wheel drive heavy duty is established,a heavy-duty construction machinery traction integrated control strategy based on flexible work surface and the front and rear axle torque distribution control is got.The results show that by reducing the accelerator position can significantly eliminate the driving wheel excessive slip phenomenon in the motion process of the heavy duty machinery on the flexible work surface,the wheel speed is maintained near the target speed.After the introduction of traction control system,the wheel speed variation can be well suppressed within the range of fluctuation in the target drive wheel speed and the excessive slip phenomenon within the speed control range.After the introduction of the traction control system to eliminate obvious differences between the front and rear axle drive wheel speed,the front and rear axle drive force distribution is more reasonable.  
        关键词：Heavy duty;Construction machinery;Drive force;Control   
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        发布时间：2022-10-20
      • Li Haiping,Zhao Jianmin,Wu Qingtian,Liu Yang
        Vol. 39, Issue 2, Pages: 40-43(2015) DOI: 10.16578/j.issn.1004.2539.2015.02.023
        摘要：Gears are the most essential parts in rotating machinery,its health status is a significant index to indicate whether machines can run continually or not.So,an automatical and accuracy way for gear early stage fault diagnosis is very important in engineering practice.A novel gear fault diagnosis method based on Euclidean distance technique（EDT）is proposed.The energies of frequency bands are used as the fault feature paramdter in this method.Then,the euclidean distance between the test sample and each health status are calculated through the matrix which consist of the energy values.The class which is the test sample belongs is decided by the minimum distance value.The effectiveness of this methodology is demonstrated using an experiment conducted on a real gearbox.The results show that EDT can diagnose the gear crack fault with a higher accuracy rate than other similar method.As the same time,band energy is a sensitive feature parameter in gear crack fault diagnosis and can be used later.  
        关键词：Gear;Frequency band energy;Feature extraction;Fault diagnosis;Euclidean distance technique   
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        发布时间：2022-10-20
      • An Ziming,Zhu Dachang
        Vol. 39, Issue 2, Pages: 44-46(2015) DOI: 10.16578/j.issn.1004.2539.2015.02.011
        摘要：A planar 3-PRP type parallel manipulator with three symmetrical limbs structure in the plane is proposed,and each limb consists of a prismatic joint is connected to a basement,one prismatic joint is connected with the moving platform,and two prismatic joints connected through a revolute joint.By using vector analysis method,the inverse and forward kinematics solution of planar 3-PRP type parallel manipulator are solved,and the Jacobian matrix is analyzed with the velocity and singular isotropic configuration.The results show that the planar 3-PRP type parallel manipulator without singularity in the work area,and through the modify motion parameters can improve the motion accuracy.  
        关键词：Planar 3-PRP type parallel manipulator;Inverse/forward solution of position;Kinematics analysis;Singularity position   
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        发布时间：2022-10-20
      • Zhuang Sen,Ouyang Kai,Cui Chao,Feng Zhipeng
        Vol. 39, Issue 2, Pages: 47-50(2015) DOI: 10.16578/j.issn.1004.2539.2015.02.017
        摘要：The deformation compatibility equation is built on the basis of the flexible treatment of the forcing pair,and the static binding force of forcing pairs of three pair bars space RCCR mechanism is solved under the condition of close to rigid body.The result is more concise and closing to the ideal state compared with that on the basis of the flexible treatment of the forcing bars.  
        关键词：Flexibility;Rigid body;RCCR Mechanism;Static binding force   
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        发布时间：2022-10-20
      • Zhang Qing,Li Ran,Zhang Xiaojie,Zhao Qianying,Qin Xianrong,Sun Yuantao
        Vol. 39, Issue 2, Pages: 51-54(2015) DOI: 10.16578/j.issn.1004.2539.2015.02.007
        摘要：The lifting gearbox which is used on self-elevating offshore platform is selected as optimized object,its features and workings are introduced,and its reliability and mass are selected as optimization objectives,and the mathematical model is established for the optimization.A kind of coordinate its reliability and economy is proposed.By giving different values to the weighing factors to obtain different optimal solutions and fit a curve of them,the reliability and economy of the gearbox can be determined and coordinated.It is verified to be an effective method to acquire a higher cost-performance ratio of the gearbox,which may provide guidance for other similar engineering problems.  
        关键词：Lifting gearbox;Optimal design;Reliability;Gear transmission   
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        发布时间：2022-10-20
      • Zhou Bin,Zeng Yishan,Zi Bin
        Vol. 39, Issue 2, Pages: 55-58(2015) DOI: 10.16578/j.issn.1004.2539.2015.02.001
        摘要：Focusing on the current limited vertical adjustment technique of large-scale drillings,a 6-DOF parallel adjustment equipment with 12 inputs is designed for the working condition of vertical drilling.The equipment mechanism consists of 6branched chains with redundancy which are symmetrical in structure.Each of the chains is composed by a compound of rotate joint and a compound of spherical joint,while the two pairs are connected by two prismatic pairs.The modal analysis is carried out on the body which is based on ANSYS software,first six order frequency distribution and modal vibration mode,and along the X、Y、Zdirection of the displacement frequency response about the moving platform are got.The analysis consequence shows that the most sensitive of external forces to the moving platform is 46 Hz frequency.Otherwise,the working space of the 6-DOF platform is obtained by using the 3-D searching algorithm.The results have significant meanings in the further research on the correlation between the parameters and the whole mechanism,as well as the optimization of the parameter.  
        关键词：Parallel adjustment equipment;Mechanism design;Modal analysis;Working space   
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        发布时间：2022-10-20
      • Yang Changhui,Xu Taojin,Xu Hongbin,Wang Zhiqiang,Liang Juke,Li Bingqian
        Vol. 39, Issue 2, Pages: 59-62(2015) DOI: 10.16578/j.issn.1004.2539.2015.02.024
        摘要：Based on the Weber energy method,the numerical integral calculation formula of timevarying meshing stiffness for spur gear is derived.The meshing points are obtained by using the method of variable increment and infinite approximation method.By using this method,the meshing points location of the gear after tooth profile modification can be easily obtained.It is convenient for the study of the tooth profile modification.And by changing the value of the increment,the accuracy errors of the position of the meshing points can be controlled within 10-4 mm.And some MATLAB programs are written to calculate the time-varying meshing stiffness of the first stage planetary spur gear of a high-power wind turbine gearbox,thus it will lay the foundation for the subsequent dynamics analysis of wind turbine gearbox.  
        关键词：Weber energy method;Time-varying meshing stiffness;Spur gear;Numerical calculation   
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      • Gao Dongqiang,Yang Lei,Sun Qian,Zhang Xifeng
        Vol. 39, Issue 2, Pages: 63-66(2015) DOI: 10.16578/j.issn.1004.2539.2015.02.003
        摘要：Headstock is the key components of the high speed vertical machining center,its static stiffness,dynamic characteristics has great effect on machining precision and stability of machining center.Taking DVG850 high speed vertical machining center spindle box as the research object,the design scheme of geometrical model of four kinds of different structure of spindle box is established,by using the finite element simulation software,the simulating calculation of the statics,modal and harmonic response of the spindle box are carried out,the resonance region of spindle box under static stiffness,natural frequency,vibration mode and the excitation frequency are got.Through the comparison analysis of finite element simulation of cloud and data,known that scheme two rib structure is the best layout,it is indicated that the research method can be to improve the spindle box structure natural frequency and increase the structure stiffness.provides the basis for avoiding resonance,for other machine tool spindle box the theory basis for optimization of structural design and improvement is provided,the design cycle can be shorten.  
        关键词：High speed vertical machining center;Spindle box;Static stiffness;Modal analysis;Harmonic response   
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      • Liu Jie,Li Hui,Li Qiang
        Vol. 39, Issue 2, Pages: 67-69(2015) DOI: 10.16578/j.issn.1004.2539.2015.02.037
        摘要：On the basis of analysis of the future development direction of naval gun system and the study of existing domestic and international shell-feeding system,learn from the desirability of them,an effective and feasible scheme model is established,the overall structure is determined.Through comparing and analyzing the advantages and disadvantages of different transmission mechanism,the gear transmission mechanism connecting by rotary supporting is adopted for the cannon drum.The rotary inertia of cannon drum rotating part is calculated and according to the design of motion law,the input torque of transmission gear when the cannon drum full load operation is calculated.At the same time,the dynamics simulation analysis for cannon drum full load model is carried out.The transmission gear input moment of force and the power time course curve are obtained.The important reference of type selection for the cannon drum driving device motor and reducer is provided.  
        关键词：Shell-feeding system;Transmission mechanism;Rotational inertia;Driving torque   
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      • Wang Yuqi,Liu Shoufa,Cao Jujiang
        Vol. 39, Issue 2, Pages: 70-71(2015) DOI: 10.16578/j.issn.1004.2539.2015.02.018
        摘要：The crank-group driving mechanism is a kind of new transmission mechanism,it is mainly used in some special light industrial machinery.Based on the Newton- Raphson method,the kinematics characteristics of the crank-group driving mechanism’s structural unit is validated and calculated by using an example of MATLAB,the 3D modeling and dynamic simulation of the new mechanism is completed through SolidWorks and ANSYS,a reference for the further research and development of the mechanism is provided.  
        关键词：Multicrank mechanism;Structural unit;Matlab;Newton-Raphson method;SolidWorks;ANSYS;Kinematics analysis;Dynamic simulation   
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      • Zhao Desheng,Wu Rongjun,Zhang Xue
        Vol. 39, Issue 2, Pages: 72-76(2015) DOI: 10.16578/j.issn.1004.2539.2015.02.012
        摘要：The 6-UPS mechanism posture matrix is described by using quaternion,and both the rotation matrix and the coordinates of the vectors are expanded to 4dimensions,and the kinematical equations is obtained.Through derivation,the new type of Jacobi matrix JAand JBof mechanism motion are obtained,and JAis described by using quaternion and do not contain beyond variables.According to the nature of the quaternion,the JAis translated into 8dimensions square matrix,and make it applicable to the analysis of singular position and posture singular.The expansion of a determinant JAand JB is respectively carried out,the trajectory equation of first kind of singularity and the second kind of singularity are obtained,and their three-dimensional trajectory surfaces are obtained by using MATLAB when the location of the mechanism is given.The advantages of solving convenient of using the matrix obtained by this method is proved.  
        关键词：Quaternion;Singularity posture;Parallel mechanism;Jacobian matrix   
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      • XiaTian,Chen Shaobo,Wang Jian,Ding Bingkun
        Vol. 39, Issue 2, Pages: 77-79(2015) DOI: 10.16578/j.issn.1004.2539.2015.02.013
        摘要：Through the analysis of the cylindrical indexing cam working surface equations and parameters,combined the macro procedure of the CATIA secondary development,macro procedure of cam surface equations is written.The point coordinate of indexing period and rest period cam surface can be generated accurately and quickly by operating the macro.The cam curve and contour surface is generated through using the cloud shape and scanning function,thus the cam solid model can be generated.The motion simulation analysis of cam mechanism motion is carried out in CATIA.The evaluation of the established cam curve and contour surface is carried out,the precision cam curve and contour surface are obtained.  
        关键词：CATIA;Secondary development;Macro procedure;Cylinder indexing cam   
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        发布时间：2022-10-20
      • Qi Xuemei
        Vol. 39, Issue 2, Pages: 80-83(2015) DOI: 10.16578/j.issn.1004.2539.2015.02.019
        摘要：For the problem of planetary transmission system that the complex system structure in the course of using,high manufacture precision and limitations strong during long-distance power transmission process.According to the traditional characteristics of the planetary transmission system,a new planetary transmission system includes belt drive is established,and its kinematics and dynamics modeling are carried out.Finally,the impact law of the main parameters of the system of ratio,structure size on the system operating characteristics are studied.Research shows that,a certain guiding significance for the design of belt drive in planetary transmission system is provided.  
        关键词：Belt drive;Planetary transmission system;Dynamics   
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      • Feng Qiyin,Zhang Jun,Du Yuhong
        Vol. 39, Issue 2, Pages: 84-87(2015) DOI: 10.16578/j.issn.1004.2539.2015.02.025
        摘要：Gear drive is used widely,and the probability of failure is very high.So it is very necessary to analyze the characteristic of the gear pair meshing.A method of using ANSYS APDL language node control technique to create the finite element model of helical gear is described,and an analysis example of using this modeling method is carried on.The distribution law of the stress and strain of the meshing process is clarified by analyzing.At the same time,the analysis of the influence of root fillet radius on the meshing character is carried out.The results show that the bending stress is decreased with the tooth root radius increases.  
        关键词：Helical gear;Meshing characteristic;Finite element;ANSYS APDL   
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      • Guo Xiancheng,Su Yi,Wang Honglin,Yuan Bo
        Vol. 39, Issue 2, Pages: 88-90(2015) DOI: 10.16578/j.issn.1004.2539.2015.02.026
        摘要：The the switch mechanism of roller overrunning clutch is introduced,with wave power generation device transmission system as example.A computational model based on elasticity mechanics is established and the physical properties are analyzed in the engagement process.The torsion stiffness expression of each component are deduced and torsion stiffness as a whole in series form is obtained finally.The calculation shows that overrunning clutch torsion stiffness is small compared to the other components.The results provide a theoretical basis for dynamics analysis,parameter optimize design and reliability study of overrunning clutch in wave power generation device transmission system.  
        关键词：Wave power generation;Roller overrunning clutch;Torsion stiffness;Normal stiffness   
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      • Wang Shuangzhen
        Vol. 39, Issue 2, Pages: 91-94(2015) DOI: 10.16578/j.issn.1004.2539.2015.02.027
        摘要：The optimization design of a tri-polar parallel gear pump is carried out by taking the minimum volume of the pump body as the objective function.In the mathematical model,the gear parameters such as modulus,tooth numbers,and thickness are taken as design variables,and the constraint condition is that the tri-polar parallel gear pump can meet the prescribed performance requirements.In the objective function,the volume of pump is replaced by the total volume of 4 mounting holes of addendum circles,which accurately reflects the volume of pump.In the process of solving optimization mathematical model,a new three-dimensional step-by-step search algorithm is proposed according to the characteristic that the formula of the objective function is very complex and the modulus,tooth numbers of gears are discrete variables.Thus an optimization algorithm for the tri-polar parallel gear pump designing is provided,and through an example,the feasibility and effectiveness of the algorithm are verified.  
        关键词：Tri-polar parallel gear pump;Objective function;Constraint condition;Three-dimensional step-by-step search algorithm   
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      • Zhao Han,Wu Guanhong,Huang Kang,Wu Zhanyu
        Vol. 39, Issue 2, Pages: 95-98(2015) DOI: 10.16578/j.issn.1004.2539.2015.02.036
        摘要：Aiming at the a UAV experience complicated dynamics environment under different conditions,firstly,the modal analysis of stress stiffening effect on the UAV main reducer is carried out,the natural frequency and mode shapes are obtained in different conditions.Then frequency response analysis of main reducer is carried out based on certain incentives implementing on the reducer.The research results show that the vibration modes of UAV are mainly torsion and modal natural frequency of UAV main reducer is increased with speed increasing.Through the frequency response analysis,the weak links of the main reducer structure design is predicted,some design references for the main reducer structural optimization are provided.  
        关键词：Modal;Main reducer;Frequency response analysis;Stress stiffening effect   
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        发布时间：2022-10-20
      • Huang Xiujin,He Lidong,Xia Xueran,Liu Ming
        Vol. 39, Issue 2, Pages: 99-103(2015) DOI: 10.16578/j.issn.1004.2539.2015.02.005
        摘要：According to the complex character of gearbox vibration and noise,a kind of viscous damper for controlling vibration of gear shafting system is proposed.A gearbox bench with viscous damper is built to experimentally verify the damping characteristics of the viscous dampers mounted on gear shafting.The experimental results show that the viscous damper can effectively suppress each frequency component vibration caused by the gear meshing force and the vibration at various speeds,achieving vibration amplitude reduction up to 50% with a rather wide vibration reduction frequency band.And it can get good damping effect in both radial and axial vibration.By contrasting the damping effects of the viscous damper mounted on different position,the overall damping effect is a little better for the damper installed on the shaft inside the gearbox than it installed on extended end of the shaft outside the gearbox.  
        关键词：Viscous damper;Gear shafting;Vibration control;Broadband vibration reduction   
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        发布时间：2022-10-20
      • Xiang Ling,Chen Tao,Hu Silei
        Vol. 39, Issue 2, Pages: 104-106(2015) DOI: 10.16578/j.issn.1004.2539.2015.02.014
        摘要：In order to obtain the changing pattern of contact force of fault planetary gear system,a dynamics model of fault planetary gear system is established and the computation method for contact force of gear meshing based on Hertz theory is also introduced,with the dynamics model,the fault planetary gear system is simulated.The results show that compared with the normal contact force of planetary gear system,the contact force of snaggletooth of planetary gear system contains obvious cyclical impact in time domain.In the frequency domain,not only the failure frequency is found,but also fault characteristic that failure frequency stands for side band in meshing frequency and the frequency doubling is appeared.Through the research of dynamics of fault planetary gear system,the reference and basis are provided for planetary gear system fault diagnosis.  
        关键词：Virtual prototype;Fault planetary gear system;Contact force;Simulation   
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      • Zhao Lijuan,Qiao Meina,Lan Jinbao
        Vol. 39, Issue 2, Pages: 107-110(2015) DOI: 10.16578/j.issn.1004.2539.2015.02.002
        摘要：Taking the planetary gear train in a new type of thin seam shearer cutting part as the research object,based on multi-body dynamics theory,the rigid-flexible coupled model of the shearer cutting part is established,and the dynamic simulation analysis is carried on,the stress and deformation of the planetary gear train parts are obtained.The structure improvement of the sun wheel and planet carrier is carried out,the maximum mesh stress on sun wheel tooth surface is decreased by423.26 MPa after improvement,the stress concentration phenomenon on planet carrier is basically eliminated,the fatigue life is improved to 8.302 2×107 times.The research methods provides a quantitative basis for the design of planetary gear train,reduces the development cost in the process of production,improves the benefit of enterprise.  
        关键词：Planetary gear train;Gear meshing;Reliability;Fatigue life   
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      • Wang Lei,Cui Yanping,Wang Yangang,Yang Yalei
        Vol. 39, Issue 2, Pages: 111-114(2015) DOI: 10.16578/j.issn.1004.2539.2015.02.015
        摘要：In view of the problem of the difficulty in precise diagnosis of tooth surface fault of gear transmission system under the complicated working conduction,a fault diagnosis method based on transmission error in gear transmission system is proposed.Different gear tooth faults would make the instantaneous transmission ratio change,which affects the transmission errors of the system.The gear fault diagnosis method based on transmission error can diagnose two types of gear tooth failure including convex and concave fault through the measurement and analysis of gear transmission error signal.The experimental results show that the method is sensitive to gear tooth fault and can effectively diagnose the presence of gear faults with convex and concave in gear transmission system.  
        关键词：Transmission error;Gear fault;Instantaneous transmission ratio   
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      • Xu Wei,Sun Jianjun
        Vol. 39, Issue 2, Pages: 115-118(2015) DOI: 10.16578/j.issn.1004.2539.2015.02.028
        摘要：As a new adjustable speed and energy conservation equipment,permanent magnetic governor is installed between motor and loads,using the magnetic circuit coupling principle,the speed control is realized through adjust air coupling area.Firstly,combined with the correlation theory of electromagnetic,the mathematical model of transient eddy current field is built.Then the static analysis of permanent magnetic governor is carried out,the static copper rotor flux distribution and magnetic induction intensity are obtained.Finally,through the finite element simulation of motion eddy current,the eddy current field formation mechanism and some factors affecting on eddy current field are analyzed,a theoretical basis for the bearing capacity of the permanent magnetic governor is provided.  
        关键词：Permanent magnetic governor;Coupling area;Current field;Finite element   
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      • Yang Songshan,Zhou Hao,Zhao Haiyang,Wang Jindong
        Vol. 39, Issue 2, Pages: 119-123(2015) DOI: 10.16578/j.issn.1004.2539.2015.02.029
        摘要：Aiming at the non-stationary and nonlinearity characteristics of reciprocating compressor vibration signal,a fault diagnosis method for bearing fault of reciprocating compressor based on LMD multiscale entropy and SVM is proposed.To improve the envelope approximation accuracy of local mean and envelope estimation,cubic Hermite interpolation method is used to construct envelope curves between extreme points according to the excellent characteristic of shape preservation.The vibration signals in each state are decomposed into a series of PF components with the improved LMD method,and the PF components which contain the main information of fault state are chosen according to the relative coefficient.By using the multiscale entropy,the quantitative description of the PF components is carried out,and the optimized scale factor is selected based on the maximum of average distances between different states,so the eigenvectors which have the best divisibility are extracted.The SVM is taken as pattern classifier,the type of bearing clearance fault is diagnosed,and the superiority of this method is verified by comparing the eigenvectors extracted by LMD and sample entropy and LMD and approximate entropy method.  
        关键词：Reciprocating compressor;LMD;Multiscale entropy;Bearing;Fault diagnosis   
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      • Yang Shuai,Zhao Dengfeng,Zeng Guoying,Chen Xulong
        Vol. 39, Issue 2, Pages: 124-127(2015) DOI: 10.16578/j.issn.1004.2539.2015.02.020
        摘要：The coupling principle of the ball through assembled camshaft is briefly explained,contrast to the shortages of the traditional one-piece camshaft and the emerging assembled camshaft with advantages of high material utilization,reliable connection and meeting the energy requirements of lightweight,etc is explained.Taking a certain type one-piece camshaft as prototype,the information as part position stress distribution cloud of the assembled camshaft during the ball through process,contact state between shaft tube and cam,wall thickness reduction amount of the shaft tube,cam deformation,friction influence are gained and analyzed through reasonable modeling and simulation.Finally,the experimental verification shows that the ball through assembled camshaft can meet the demand of the engine actual conditions.A certain theoretical reference basis for the design and machining of the ball through assembled camshaft is provided.  
        关键词：Assembled camshaft;Stress analysis;Deformation analysis;Contact state;Wall thickness reduction;Friction force   
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      • Liu Xin,Jia Yunxian,Zhou Jie,Yao Jinfang
        Vol. 39, Issue 2, Pages: 128-131(2015) DOI: 10.16578/j.issn.1004.2539.2015.02.030
        摘要：For the degradation characteristic of the gear performance parameter,a method of fault pattern recognition and analysis,which combines the Delayed Correlation-Envelope（DCE）with the Hidden Markov Model（HMM）is proposed.The DCE is used to extract features from vibration signals.The HMM is trained respectively by using the data under normal condition,gear root crack condition and gear root breaking condition.Moreover,the trained HMMs are used to pattern recognition and assessment model.Finally,by comparing with standard HMM,the experimental results show that the proposed methodology is feasible and effective.  
        关键词：DCE;HMM;Baum-Welch arithmetic;Multiple-observations sequence   
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      • Li Sha,Pan Hongxia,Zhang Jundong,Zhao Weiwei
        Vol. 39, Issue 2, Pages: 132-136(2015) DOI: 10.16578/j.issn.1004.2539.2015.02.021
        摘要：Aiming at the non-stationary and nonlinear of gearbox vibration signals,a fault diagnosis method based on the multi-fractal and particle swarm optimization support vector machine（PSO-SVM）is put forward.Firstly,the fractal filter with short-time fractal dimension as fuzzy control parameters is used to filtering noise reduction the gearbox vibration signals with bigger background noises.Secondly,the multi-fractal spectrum algorithm is applied to analyze the signal after filtering,the results show that the characteristic parameters:Δa（q）、f（a（q））maxand box dimensions Dbcan give a good presentation for gearbox working condition.Finally,the particle swarm optimization（PSO）is applied to optimize the parameters of support vector machine（SVM）.Taking the multi-fractal characteristic vectors as input parameters of PSO-SVM and SVM to recognize the fault types of the gearbox.The results show that SVM based on particle swarm optimization can improve the classification accuracy.Meanwhile,the validity of gearbox fault diagnosis based on muti-fractal and PSO-SVM is proved.  
        关键词：Gearbox;Fractal theory;Multi-fractal;PSO-SVM;Fault diagnosis   
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      • Bai Guicai,Shentu Liufang
        Vol. 39, Issue 2, Pages: 137-141(2015) DOI: 10.16578/j.issn.1004.2539.2015.02.031
        摘要：A multi-body dynamic contact finite element model of a deep groove ball bearings that be used in planetary gear is established in LS-DYNA,based on explicit dynamics finite element method,considering effect of rotational speed of bearing outer ring,radial load and rotational speed of carrier,the simulation analysis of dynamic contact characteristic（displacement,velocity,stress and contact force）under different working conditions are carried out,the dynamic contact response of the bearing is obtained.The study shows that the rolling exist revolution and rotation movement during operation,the maximum and the minimum line speed occurred at the contact point with the outer ring and the inner ring.The maximum stress occurred when the rolling contact with outer ring or inner ring,and the influence of the rotational speed to the maximum stress is little.It is proved reliable based on the simulation results compared with Hertz solution.The contacting force fluctuation between the rolling and cage is bigger than that and the inner or outer ring,but the value is the minimum,the contacting force value between the rolling and the outer ring or inner is almost same with the radial load.  
        关键词：Ball bearing;Planetary gear;LS-DYNA;Dynamic contact;Finite element analysis   
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      • Wei Liangbao,Yang Shasha,Zhao Guangyang,Zhao Xiaomin,Gong Guiliang
        Vol. 39, Issue 2, Pages: 142-145(2015) DOI: 10.16578/j.issn.1004.2539.2015.02.032
        摘要：First of all,the 3Dmodeling of spiral bevel gear is conducted by using SolidWorks software.Then,based on Hertz contact theory,a virtual prototype model of spiral bevel gear for forklift main reducer is established by using ADAMS,through simulation experiment,and the change curve of gear meshing force amplitude fluctuations with the center distance change is got.Finally,through the inserting point method taking three typical installation,the further analysis of the dynamic meshing characteristic is carried out.By contrast,the control range of center distance of transmission stability more reasonable installation error is got and the optimal installation center distance is got,it can reduce vibration and improve the quality of gear meshing,the reference for the optimization design of installation center distance of the spiral bevel gear is provided.  
        关键词：Forklift main reducer;Spiral bevel gear;Installation center distance error   
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      • Yan Shuaiyin,Bo Ruifeng,Li Ruiqin,Yin Shuyu,Shen Xingquan,Pan Hongjun
        Vol. 39, Issue 2, Pages: 146-149(2015) DOI: 10.16578/j.issn.1004.2539.2015.02.039
        摘要：Aiming at the defects of weak local search ability and the low solution accuracy of penalty function when solve the nonlinear programming problem,the nonlinear programming algorithm is introduced to the genetic algorithm and a nonlinear programming genetic algorithm is proposed based on dynamic penalty function.Combining the capable of global optimization of the genetic algorithm and the capable of local optimization and introducing dynamic penalty function,according to the value of penalty term is modified adaptively based on the distance of infeasible points to feasible solution space and feasibility degree,the global optimal solution is quickly to calculate.The design of dynamic penalty function and the key technology and process of improved genetic algorithms are introduced.Finally,the reasonability of algorithm is verified based on the example of the optimum design of a certain automobile gearbox.Compared with the traditional genetic algorithm,the solution quality and converged speed of improved genetic algorithms are improved obviously.As a result,a new way of thoughts is provided for genetic algorithm improvement.  
        关键词：Dynamic penalty function;Nonlinear programming genetic algorithm;Local optimal solution;Global optimal solution   
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      • Lu Xiaojian
        Vol. 39, Issue 2, Pages: 150-152(2015) DOI: 10.16578/j.issn.1004.2539.2015.02.041
        摘要：The remodeling of timing chain system in Enventive is carried out based on original design in CAD system,then the tolerance analysis for timing phase error of cam shaft is analyzed in Enventive.By analyzing sensitivities and contributions of each element in dimension chain,the tolerances of significant dimension is adjusted to achieve the purpose of optimization design.  
        关键词：Enventive;Tolerance analysis;Timing chain system;Timing error   
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      • Zhu Lei,Fu Yanming,Zhou Xuanyan,Fu Haoyun
        Vol. 39, Issue 2, Pages: 153-157(2015) DOI: 10.16578/j.issn.1004.2539.2015.02.033
        摘要：The data preprocessing method of the cam profile and data error compensation theory of the cam profile in the reverse design cam mechanism are introduced.According to the introduction of cam,the data of discrete points of the actual cam profile line is mapping,the possible’noise point’is removed,and the cam theoretical profile equation is deduced.Then according to the cam design theory,the angular displacement and angular quasi-acceleration of the cam follower is solved by using numerical computation method.Through comparing the value between angular quasi-acceleration and expected angular quasi-acceleration,the error of the angular quasi-acceleration is obtained,then the angular displacement error is solved.Through removing the angular displacement error,the cam theoretical profile compensation is carried out,and the data of discrete points more closer to the original design of cam profile line is acquired.Thus the scientific method for the reverse design of this kind of cam mechanism is provided.  
        关键词：Cam mechanism;Reverse design;Data preprocessing;Error compensation   
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      • Ye Naiwei,Lv Xiaobing,Deng Zhongxiang,Li Quanwei,Song Huijun,Wang Xuewu
        Vol. 39, Issue 2, Pages: 158-161(2015) DOI: 10.16578/j.issn.1004.2539.2015.02.004
        摘要：The gearbox equipment failure analysis of a twenty-high cold rolling mill coiling machine is carried out.The stress analysis of gear is conducted,and the domestic design calculation and manufacture of gear is carried out,it is better meet the normal production of enterprise.  
        关键词：Coiling machine;Double helical gear;Failure   
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      • Deng Xiaozhong,Zhang Yanzhen,Li Tianxing,Zhao Bo
        Vol. 39, Issue 2, Pages: 162-165(2015) DOI: 10.16578/j.issn.1004.2539.2015.02.034
        摘要：On the basis of a large number of reference,the research trends on modification of cycloidal gear,the accuracy control of cycloidal gear transmission and the dynamics of RV reducer is introduced,and the analysis and discussion on the key technology of the modification,manufacturing and manufacturing equipment development need to be solved of the cyclonical-pinwheel transmission is carried out.  
        关键词：Cycloidal gear;Modification;Accuracy;RV reducer   
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      • Zhao Wei,Xu Wanli,Xu Ximeng,Su Bin
        Vol. 39, Issue 2, Pages: 166-170(2015) DOI: 10.16578/j.issn.1004.2539.2015.02.035
        摘要：The lubricating oil plays an important role on the performance of transmission synchronizer,and the related compatibility evaluation can provide the technical support for reasonable selection oil.The domestic and overseas research progress of compatibility evaluation technology is summarized from test rigs,experimental parts and evaluation standards of experimental results.The similarity and difference between the experimental parts and simulative condition used in existing evaluation technology and the structure and actual condition used in domestic transmission synchronizer are discussed.Meanwhile,the research progress of lubricant performance evaluation used for manual transmission synchronizer is introduced.Finally,some challenging problems and developing trend of the related evaluation technology are pointed out.  
        关键词：Lubricating oil;Transmission synchronizer;Evaluation technology   
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      • Vol. 39, Issue 2, Pages: 5(2015)
        摘要：<正>重庆机床（集团）有限责任公司（以下简称重庆机床集团）成立于1940年,先后试制成功中国第一台滚齿机、剃齿机、插齿机、蜗轮母机等制齿机床,是中国制齿设备诞生的摇篮。目前,重庆机床集团拥有加工直径φ10mm-3200mm,数控轴一轴至九轴9个系列90余种制齿机床,广泛应用于汽车、工程机械、船舶、能源矿山、航空航天等行业,国内市场占有率长期保持在60%以上,并远销美国、日本、韩国、法国等80个国家和  
          
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      • Vol. 39, Issue 2, Pages: 6(2015)
        摘要：<正>本研究中心专业从事齿轮工程技术研发;有一支由长江学者、教授、海归博士、博士后、工程师等构成的近50人的技术团队;拥有30年的齿轮技术研发历史,承担了包括国家重大科技专项、863、支撑计划在内的一系列齿轮研发项目和课题,在齿轮领域取得了一系列达到国际水平填补国内空白的研究成果,获得国家科技进步奖1项、授权发明专利26项;拥有一批世  
          
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      • Vol. 39, Issue 2, Pages: 7(2015)
        摘要：<正>滑油金属屑末在线监测设备公司简介浙江中欣动力测控技术有限公司是一家从事动力设备在线健康检测技术研发的高科技企业,主要从事军品相关项目的技术研发、生产和配套加工。公司研发的基于电磁、电容及光纤等传感技术的检测系统为航空发动机、汽轮机、燃气轮机、风力发电机以及船舶动力等设备的安全运行提供保障。  
          
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      • Vol. 39, Issue 2, Pages: 8(2015)
        摘要：<正>浙江中益机械有限公司,创建于1954年,于2003年12月由原嵊州市机械链轮厂改制为浙江中益机械有限公司,注册资本8900万元,总资产6.1亿元。是中国第一家链轮制造企业,也是目前全球最大的标准链轮生产企业。公司占地面积42万平方米,生产车间达14万平方米,现有员工800多人。公司拥有加工中心、数控等各类机床800多台（套）,并配备了三坐标仪  
          
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      • Vol. 39, Issue 2, Pages: 11(2015)
        摘要：<正>广西玉林玉柴机器配件制造有限公司（简称"玉柴配司"）成立于2000年1月,由广西玉柴机器股份有限公司和广西玉柴机器集团有限公司共同出资组建,具有独立法人资格的有限责任公司,是玉柴机器、南京依维柯、道依茨大柴、江铃福特等国内知名发动机企业零部件核心供应商。公司主要利用QT800-6、QT600-10两大技术平台,发挥铁型覆砂铸造技术优  
          
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      • Vol. 39, Issue 2, Pages: 13(2015)
        摘要：<正>公司简介:哈尔滨广瀚动力传动有限公司是中国船舶重工集团公司第七○三研究所控股子公司,黑龙江省高新技术企业,公司以七○三所舰船动力传动专业为技术依托,拥有强大的设计、研发能力。公司通过长期的技术积累,掌握了高速、重载等核心动力传动技术,形成了一支高水平的研发技术团队,涵盖机、电、液等专业方向,实践经验丰富,研发模式己由传统的经验模式转变为更加严谨的理论-试验相结合模式,精通动力学分析、静力学分析、应力应变分析、流体仿真分析、  
          
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      • Vol. 39, Issue 2, Pages: 16(2015)
        摘要：<正>江苏新瑞戴维布朗齿轮系统有限公司为新誉集团下属的中英合资企业,注册资本4592万美元。并于2010年9月收购常州减速机总厂有限公司。公司占地面积165000平方米,建筑面积90000平方米,现有职工332人,公司成立了江苏省齿轮传动与控制工程技术研究中心,并与华中科技大学联合成立了企业院士工作站。  
          
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