最新刊期
期 6 ， 2017
- 摘要：A nonlinear transverse-torsional coupled dynamics model for planetary gear sets is established with considering time-varying meshing stiffness and gear backlash,and the changes of dynamic load sharing characteristics are analyzed when errors and error phase angles exist on individual or multiple components. The results show that the installation,eccentricity error of central components and eccentricity error of planetary gear make load sharing coefficient change periodically,while the installation error on planetary gear will make a sustained partial load for meshing pairs and the uneven load phenomenon is the most serious when error phase angle is in tangential direction. The error of planetary gear has the biggest effect on load sharing coefficient,and it is suggested to avoid error distribution on planetary gear. The load sharing performance is better when errors are distributed on adjacent planets than on non-adjacent planets or on one single planet. The effects on load sharing coefficient can be greatly Reduced when errors with the same amplitude and phase angle exist on all the planetary gears.关键词：Planetary gear set;Installation error;Eccentricity error;Error phase angle;Load sharing characteristic
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发布时间：2022-10-20 - 摘要：Using topological structure synthesis method Based on the POC set,the type synthesis of 1-translational and 2-rotation parallel mechanism is carried out. The general steps and concrete operation methods of topological structure design of a 1-translational and 2-rotation parallel manipulator is given. Many kinds of mechanisms are obtained based on this approach,including some previously designed mechanisms and some new mechanisms,and these mechanisms are analyzed and classified.关键词：Parallel mechanism;Type synthesis;1-translational and 2-rotation;POC set
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发布时间：2022-10-20 - 摘要：A new type of shaper is proposed,a parallel 2-DOF diamond mechanism is adopted in the new mechanism to convert the input of two servomotors into the single high-power output of the ram,the uniform cutting operation is realized,the processing quality is improved and has industrial valve. The kinematics of the shaper is analyzed and the design space of the main motion mechanism is established. Based on the above,the atlas for ram stroke,velocity,payload capability,stiffness and acceleration are plotted and the relationship between the performance and the link lengths of the mechanism is established. The atlases are very useful for performance evaluation and optimum design for the shaper.关键词：Shaper;Parallel mechanism;Design space;Performance atlas
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发布时间：2022-10-20 - 摘要：In order to explicitly solve the tooth surface model of forming face gear,and exactly solve the minimum inner radius of face gear with top-cut. The orthogonal face gear envelope coordinate system is established and the tooth surface equation of generating gear is given. The face gear working tooth surface equation,transition surface equation and top-cut surface equation are derived. According to the tooth surface equation,the simulation analysis of face gear tooth surface is carried out by using the MATLAB 7. 5 and CATIA V5. According to the simulation comparison of tooth surface and the analysis of top-cut boundary line,the top-cut minimum inner radius key point is got,the key point is the intersection of the face gear tip surface and top-cut boundary line. Through the explicit solving the key points,the minimum inner radius of the face gear without top-cut can be got. Comparing with the existing literature results of the implicitly solving inner radius,and the difference on numerical is small between the two. Finally,through the simulation cutting tooth way,it shows the accuracy of this method is superior to the method of literature.关键词：Face gear;Tooth surface equation;Top-cut;Inside radius
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发布时间：2022-10-20 - 摘要：In order to conduct dynamic health assessment for the roller bearing and describe the dynamic process of its performance degradation accurately,by using the method of combining the Self-organizing map（ SOM） and restricted Boltzmann machine（ RBM） to implement the health assessment of rolling bearing. With the consideration of degradation induced changes for response features,unsupervised learning scheme based on SOM,with the help of multi-domain feature sets consist of features in time domain,frequency domain and time-frequency domain,the optimal feature domain is constructed by sorting the diverse features adopting the sequential forward selection（ SFS） regulation,the mapping relationship between the selected feature vectors and bearing health status is obtained. To avoid the problems of being easy to be run into local optimum,parameter adjustment difficulties and a long training process,when conducting the learning process using traditional neural network algorithms,the model for health assessment is constructed by using the RBM as an alternative.Experimental results demonstrate that the proposed method can identify the health status of rolling bearing during the dynamic process of performance degradation with a good engineering applicability.关键词：Sequential forward algorithm;Self-organizing map;Restricted Boltzmann machine;Health assessment;Rolling bearing
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发布时间：2022-10-20 - 摘要：In order to obtain the end face engagement worm gear（ hereinafter called as EWG）,which has the features of small volume,rational structure and large bearing capacity,by using the finite element and elasticity theory,the three-dimensional finite element model of EWG is set up. Based on the theory of dynamics and modal analysis,the modal parameters for natural frequency and main vibration mode of EWG are obtained.At last,based on the response surface method of WORKBENCH,taking the first natural frequency and volume as optimization objective,the rational compact structure and large bear capacity of EWG is obtained by multidimensional optimization design. The analysis results show that the volume of the worm reduced by 15. 5%,which guarantee the dynamic property. The results provide basis for modal test,transient analysis and process and manufacturing.关键词：End face engagement;Worm gearing;Finite element modeling;Modal analysis;Structural optimization
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发布时间：2022-10-20 - 摘要：The dynamic load simulation is a key technology of indoor bench test and an important assessment of automatic transmission performances. In order to achieve EM-CVT dynamic load simulation,the dynamic load simulation method is researched by using MATLAB/Simulink to establish the mathematical model of automatic transmission dynamic load simulation system and combining with the speed tracking control algorithm.The virtual test is carried out,which refers to a section of the NEDC city cycle,the EPA performance index is introduced to evaluate the system performance. The results show that the motors can response to speed and torque instruction of model rapidly,the system can run smoothly,the maximum relative errors of rotational speed and torque are 1% and 8%,the standard errors of estimate（ SE） and the coefficients of determination（ r2） of speed and torque are 4. 3 r/min,17. 7 N·m and 0. 99,0. 91,it has a better performance than EPA performance index.关键词：Dynamic load simulation;Virtual test;EM-CVT;Automatic transmission;System simulation
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发布时间：2022-10-20 - 摘要：In order to improve the braking performance and service life of wet brake,taking the wet brake of the dump truck as research object,based on the fractal theory,considering the influence of variable effect of moving heat source and friction heat flow,the mathematic model of wet brake temperature field is established,the 3D solid model of friction pair is established in the CATIA and the emergency braking is simulated by using the finite element analysis software ANSYS,the wet brake temperature field and stress field distribution are studied. The results show that the temperature and stress of wet brakes concentration in the radial edge position under emergency braking situations,this position is the most prone to thermal wear and thermal failure,it is consistent with the friction pair damage position in the process of actual use,which provides a reliable theoretical basis for the design and selection of wet brake.关键词：Wet brake;Fractal theory;Temperature field;Emergency brake
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发布时间：2022-10-20 - 摘要：The gear stiffness calculation has important significance for the study of noise and vibration of power transmission system. Based on the finite element calculation of the software Abaqus,the torsional mesh stiffness of spur gear with involute profile is studied. In the study,the relationship between teeth is processed by using the contact model,the meshing torsional stiffness result of single tooth model under multiple states in the entire engagement cycle is obtained. The Ishikawa formula for gear stiffness calculation is analyzed and the calculation result is compared with the gear stiffness calculated by the finite element method,and the accuracy and error sources are analyzed. The meshing stiffness of the full gear model is calculated by using the finite element contact model,the variation of spur gears meshing stiffness is obtained. Based on the FEM results of the spur gear,a fast calculation method for meshing torsional stiffness of helical gear is given.关键词：Spur gear meshing;Finite element calculation;Single tooth stiffness;Torsional mesh stiffness
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发布时间：2022-10-20 - 摘要：Based on the analysis of transmission mechanism of rod-gear type Pulse Continuously Variable Transmission（ P-CVT）,the closed vector equations of equivalent plane six-bar mechanism are built. The kinematic mathematical model of angular displacement,angular velocity and angular acceleration of connecting rod,rocker and meshing point to input shaft axis of single phase transmission mechanism is constructed by the matrix method. At last,the kinematics simulation of three key components of connecting rod,rocker and output shaft plate is carried out by using MATLAB program. The results show that the rod-gear type CVT has the advantages of large variable speed range and low pulse rate,it also has the disadvantages of large inertia force of rod,rocker and large impact of output shaft disc etc.关键词：Rod-gear type;P-CVT;Kinematical analysis
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发布时间：2022-10-20 - 摘要：Aiming at a kind of 3T2R parallel mechanism used in the industrial application,the method of parallel mechanism type synthesis based on GFset configuration theory is proposed,the specific steps of the 3T2R parallel mechanism type synthesis are given. Combining with the specific parameter,the final selection of 3T2R parallel mechanism with determined motion features is filtered. The 3-PPPR1 R2 is selected as the research object,the kinematics and dynamics analysis of the mechanism is carried out by using ADAMS,and the correctness of the 3T2R parallel mechanism based on the theory of GFset configuration in parallel mechanism is verified.关键词：Parallel mechanism;Structure synthesis;GF set theory
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发布时间：2022-10-20 - 摘要：In order to realize the outer generator swinging rod teeth drive steadily transmit with high transmission ratio and heavy load,the cycloid curve with a continuous derivative curve till third order and the character of no rigid or no flexible impact is adopted as the tooth profile of outer generator cam. The plural-rectangular coordinate system is established,the outer generator cam teeth profile is designed with the method of plural vector,then the theory and the actual teeth profile equations of center gear are derived based on speed conversion principle and envelop theory. Through analyzing the curvature radius of center gear,the design conditions of avoiding interference of teeth profile is determined. The change law of transmission pressure angle is analyzed.关键词：Cycloid cam;Outer generator cam swinging rod teeth drive;Radius of curvature;Pressure angle
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发布时间：2022-10-20 - 摘要：In order to study the influence of the roller shape on the dynamics performance of the Mecanum wheel,the design method of the Mecanum wheel roller contour is firstly proposed,and then the parametric model of the Mecanum wheel is established. The motion processing of the Mecnaum wheel is simulated based on ADAMS. The movement characteristics of the Mecanum wheel with the designed roller are obtained,and the influence of different roller shapes on the dynamics performance of Mecanum wheel is compared and analyzed in detail. The results provide the subsequent vehicle motion control and trajectory planning with original data,and have certain guiding significance for improving the motion stability of the omni-directional mobile vehicle.关键词：Mecanum wheel;Roller shape;Vibration characteristic;Dynamics simulation
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发布时间：2022-10-20 - 摘要：Aiming at the structure of transmission case housing used in electric vehicle,the topology optimization analysis of transmission case housing used in electric vehicle,including the external and internal reinforcing plates and outside profile is conducted by using the method of topology optimization analysis from the forward design. In the optimization,the minimum weighted compliance is set as the optimization objective and volume fraction,displacement,stress,modal frequency and machining technology as constrains. Based on the topology optimization result,the optimization design of transmission case housing is carried out with considering the requirements of assembly,lubrication and cooling. Furthermore,the stresses state and modal frequency of the transmission case housing is also calculated in order to verify its structural strength and vibration performance. The analysis results show that the structural strength and modal frequency of the optimized transmission are higher than the design index,the optimization design of the complicated transmission case housing structure is realized.关键词：Electric vehicle;Transmission case housing;Topology optimization;Finite element analysis
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发布时间：2022-10-20 - 摘要：The modeling of the flexibility matrix of the fully compliant mechanism is the basis for its analysis. Taking the 3-RRR fully compliant parallel mechanism as an example,and the establishing processing of the flexibility matrix model of compliant mechanism is derived based on the coordinate transformation method.The finite element analysis of the fully compliant mechanism is carried out,the correctness of the flexibility matrix is verified. This method is helpful to the calculation and analysis of compliance of the flexible mechanism,it provides convenience for the kinematics and dynamics analysis of compliant mechanism.关键词：Parallel micromanipulator;Flexible joint;Flexibility matrix;Finite element
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发布时间：2022-10-20 - 摘要：Aiming at the actual situation of coal mines unmanned area,a four wheels drives small space detecting robot system for collecting information and samples of the underground environment is designed and developed. The robot is composed of a robot mechanism,travel mechanism,the controller and manipulator mechanism. The robot system components are described,the dynamics and static analysis of the 5 degrees of freedom manipulator is conducted to verify the rationality of its structural design and bearing performance in practical work. The results show that the change of each robot joint torques stable and did not exceed the limits value of the motor to provide. The maximum deformation of forearm is 0. 012 397 mm,the maximum stress on the system configuration 15. 802 9 MPa is little affected,it shows that 5 DOF manipulator type selection is accurate,structure design is reasonable,the practical needs of the coal mine is met.关键词：Detection robot;Manipulator;Dynamics analysis;Statics analysis
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发布时间：2022-10-20 -
Dynamic Optimum Design for the Gear Transmission System of the Lifting Mechanism of Mining Excavator
摘要：Taking the two stage gear transmission system of the lifting mechanism of a 300 kW mining excavator as study object,based on the gear dynamics theory,the multi objective dynamic optimization design is carried out on the basis of the simplified dynamics gear vibration model analysis,which aims at reducing the vibration and reducing the volume of the transmission system. By comparing and analyzing the dynamic characteristics of the system,the results obtained from the optimization design can meet the requirements of the system own strength,and at the same time,the quality and volume of the system are reduced.关键词：Mining excavator;Gear transmission system;Dynamic optimum design- 3
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发布时间：2022-10-20 - 摘要：A new analytical framework for the surface-mounted permanent magnet axial flux eddy current coupler is established and the characteristic analysis is carried out. By combining three-dimensional magnetic equivalent circuit approaches,Faraday’s law and Ampere’s law,a electromagnetic analysis model of the axial-flux eddy current coupler is established. In addition to account for the three dimensional parameters,the proposed analytical approach can effectively deal with the complex geometric shape of the model. The discussions of the influence of the material and the thickness of the conductor layer on the applicability of the multi-layer analytical model,the influence of the number of layer are carried out based on the analytical model. The results of three-dimensional finite-element simulation show that the established multi-layer analytical model is precise within a certain range.关键词：Multi-layer analytical model;Axial magnetic flux;Permanent-magnet eddy-current coupler;3-D finite element simulation
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发布时间：2022-10-20 - 摘要：As for the floating planetary gear reducer in hub motor,a dynamics equation of dual floating planetary transmission system is established,and then the calculation formula of load sharing coefficient is deduced. The simulation of dynamic meshing force between teeth is conducted to evaluate the effect of different types of floating structure of planetary gear meshing both inside and outside on the system load with regard to the angular velocity and contact forces. The simulation results show that the planetary gear angular speed of the double floating type planetary gear system tends to be more consistent,less fluctuation and mutation during the operation process. The planetary gear force distribution is more uniform. It has the minimum load coefficient and the load sharing performance is significantly better than that of free floating and single floating planetary gear structure. This results provide supports for the selection and load sharing design of the planetary gear reducer for the hub motor.关键词：Planet gear;Load sharing performance;Dynamics model
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发布时间：2022-10-20 - 摘要：Aiming at the problems of complex process and the unclear geometric meaning in solving the inverse kinematics of 6-DOF serial robot,a solving method based on combined geometric method and screw theory method is proposed. The kinematics model of the robot is established based on screw theory,and Paden-Kahan sub-problem method is often used to solve the inverse kinematics problem. However,for the robot whose first three axes are not intersecting at one point,it is difficult to apply the existing sub-problem to solve.Therefore,a geometric method is used to solve the value of the first three joint angles,and for the robot with the last three joint axes intersecting at one point,by using the Paden-Kahan sub-problem method,a closed-form solution of the inverse kinematics of the robot is derived. The effectiveness of the algorithm is verified by ABB1410 robot.
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发布时间：2022-10-20 - 摘要：According to the structure and layout of less DOF 2-RPU/UPU parallel mechanism,it is overconstraint. The 3-dimensional model of the mechanism is established in Pro/E. By using the screw theory,the DOF analysis of freedom of this mechanism is carried out. The inverse position solution is obtained by mechanism space coordinate transformation. Finally,the workspace of this parallel mechanism is solved by using Simmechanics toolbox in MATLAB.关键词：Parallel mechanism;Inverse position;Workspace
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发布时间：2022-10-20 - 摘要：On the basis of taking 2K-H type helical differential gear train as the basic prototype,by analyzing the transmission efficiency of its transformation part and piecewise integration in meshing range,the result of the meshing efficiency of the internal and external contacted helical gears from the actual helical gears meshing is got. At the same time,the concept of the ideal machine is introduced,with the consideration of the axial overlap of the helical gear and the gear on the frictional engagement of the power loss,the formula of the helical gear differential gear train transmission efficiency is deduced. By using the given example numerical,theoretical value of the gear train efficiency is calculated,and this result is consist with the simulation result obtained by MATLAB and ADAMS software co-simulation calculation. The method can be used for calculating the efficiency of the other type helical differential gear train.关键词：Helical gear;Differential gear train;Efficiency;Simulation model
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发布时间：2022-10-20 - 摘要：In order to analyze the dynamic characteristics of gear transmission system in the controlled starting transmission（ CST）,taking the heavy scraper conveyor under varying load working condition as example,a virtual prototype of the system is established and dynamics simulation is carried out,the dynamic meshing force of gears,vibration response of planetary gear and dynamic loads of each bear point are obtained. The simulation results demonstrate that dynamic changes of gear meshing forces can match up with actual gear transmission,the dynamic response of planetary gear reflect the vibration situation of system,the dynamic loads of bear point are affected by the meshing force,the dynamic changes are same. The experiment of CST under varying load working condition is carried out,the test data of meshing frequency is close to the results of simulation which is validated the accuracy of the virtual prototype,besides,the results provide the theory basis for the dynamic performance optimization of CST gear transmission.关键词：Controlled starting transmission（CST）;Gear transmission system;Dynamics analysis;Dynamic characteristic
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发布时间：2022-10-20 - 摘要：With the development of powder metallurgy technology in recent years,the applications of powder metallurgy gear becoming more and more widely. But the porosity structure of material may results in larger gear tooth bending deformation of powder metallurgy gear compared with the traditional material gear. The larger gear tooth bending deformation will influence on the transmission efficiency of powder metallurgy gear and even dynamics. By using gear tooth contact conditions of traditional material gears as reference,the influence of the porosity structure of powder metallurgy material on gear contact conditions is studied. At the meantime,the contact fatigue life of surface densified powder metallurgy gear is analyzed. The reference for further research of powder metallurgical gear is provided.关键词：Gear;Powder Metallurgy;Contact condition;Porosity structure
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发布时间：2022-10-20 - 摘要：Taking the homemade high precision RV reducer as study object,According to the characteristics of the transmission principle and structure,by using the sensitivity index analysis,the parameter optimization design of the RV reducer is carried out,the theoretical value of geometry backlash of theory reducer is obtained,the effectiveness of the proposed method is verified by experiment. The study results show that,the calculated value of theoretical geometric backlash is 0. 397’ 0. 859’,and the backlash of experiment test is0. 93’. The test results are verified through the experiment and theory calculation results contrast analysis,the homemade RV reducer can meet the using requirement of the reducer. A theoretical basis for the research and development of RV reducer is provided by this study.关键词：RV reducer;Backlash;Sensitivity index;Experimental test
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发布时间：2022-10-20 - 摘要：It is a common movement type in industrial production for the end-effector of industrial manipulator executing tasks according to desired track. The high nonlinearity and coupling are shown from the dynamics characteristic of industrial manipulator because of the constrained relationship brought by desired task.Therefore,it is difficult to establish dynamical equation with traditional Lagrange equation. Aiming at the dynamics modeling of industrial manipulator subject to constraint,the additional torque and dynamical equation of industrial manipulator subject to some desired trajectory is acquired based on the famous Udwadia-Kalaba equation in analytical mechanics field. The disadvantage of obtaining dynamical equation from traditional Lagrange equation by Lagrange multiplier is overcome by the new approach. The stimulation results of the varying law of the joint angles and the motion path of the end-effector prove that the dynamical equation established by this method conforms to the matter of fact.关键词：Constraint;Industrial manipulator;Dynamics modeling;Udwadia-Kalaba equation
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发布时间：2022-10-20 - 摘要：According to the problem that a certain type of automotive transmission case in the sale is easy to crack,the finite element modal analysis and operational modal tests of automotive transmission are carried out and the modal parameters of transmission are obtained. Then,the reliability of the results is verified by the modal correlation matrix. On this basis,through comparing the results between simulation and experiment,the correctness and reliability of the simulation analysis are proved. The mode shapes which prone to fatigue cracking are analyzed. Finally,from the perspective of the frequency shift,the installation type of the powertrain is optimized,the overall stiffness of the transmission is improved,the test results provide method and theoretical basis for avoiding the transmission case cracking.关键词：Transmission;Crack;Modal analysis;Dynamics optimization
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发布时间：2022-10-20 - 摘要：Aiming at the influence of surface roughness and screw pitch deviation on the performance of ball screw,through orthogonal experiment method,the influence factors of grinding wheel speed,trimming feed rate,screw rotation speed and grinding depth on roughness and pitch deviation are explored,the primary and secondary order influencing on the performance of ball screw is determined. The research finding,in the process of grinding,the best combination of various processing parameters for roughness is that the grinding wheel speed takes 1 144 r/min,trimming feed rate takes 208 mm/min,screw rotation speed takes 16 mm/min,grinding depth takes 2 μm. The rank of each parameter variation from its maximum to minimum value is grinding wheel speed,trimming feed rate,screw rotation speed and grinding depth. The best combination of various processing parameters for pitch deviation is that the grinding wheel speed takes 1 144 r/min,trimming feed rate takes 208 mm/min,screw rotation speed takes 16 mm/min,grinding depth takes 1 μm. The rank of importance of each parameter variation from its maximum to minimum value is screw rotation speed,grinding depth,trimming feed rate,grinding wheel speed.关键词：Ball screw;Grinding;Roughness;Screw pitch deviation;Orthogonal experiment
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发布时间：2022-10-20 - 摘要：As the current research about the dynamics of roller overrunning clutch in the transmission system of loader is insufficient,on the basis of virtual prototype technology,the simulation analysis of the working process of loader roller overrunning clutch is carried out. The typical operating conditions of overrunning and wedging of the roller overrunning clutch used by loader are chosen to be analyzed by using the multi-body dynamic stimulation analysis software ADAMS,and consequently several important parameters,such as the response characteristic of spring in overrunning,the engagement time and impact load in wedging etc.,are obtained,which provides reference for a better understanding of the working process of overrunning clutch.关键词：Multi-body dynamics analysis;Overrunning clutch;Contact characteristic
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发布时间：2022-10-20 - 摘要：Taking a CPC30 type forklift gearbox as the research object,first of all,the model is established by using the three dimensional modeling software SolidWorks. The dynamics simulation analysis under the condition of forward gearbox first gear is carried out in the ADAMS,the time domain and frequency domain diagrams of gear meshing force under the largest working condition of the engine are obtained. Through comparative analysis,the simulation values agreed with the theoretical value,the correctness of the dynamic model is verified. By using STEP function to simulate the engine for forklift gearbox drive,and using different loading times,the dynamic load of the engine under each loaded mode is got. The results of the research have certain guiding significance for the checking and optimization,vibration characteristics and stability of the forklift gearbox transmission system.关键词：Forklift gearbox;Gear meshing;Dynamics simulation;Adams
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发布时间：2022-10-20 - 摘要：The tooth surface modeling,cutting simulation and finite element analysis of hypoid gears cut by the completed method is studied,which the wheel gear is cut by the format method while the gear is generated by the duplex helical method. The pinion tooth surface equation can be derived based on the coordinates transformation and spatial meshing theory. According to machine-tool settings of Gleason’s summary,the high-precision solid model of gear pairs can be established by the cutting simulation of the generated motion between cutter and blank in CATIA software package. By using the finite element software Abaqus to conduct the contact analysis of gears drive,and the tooth root bending stress and the tooth surface contact stress can be calculated and extracted in the entire meshing process,the research results can provide a reference for the strength design of hypoid gear.关键词：Hypoid gear;Completed method;Solid modeling;Finite element analysis
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发布时间：2022-10-20 - 摘要：For the most of the leg-supporter mechanism of leisure chairs,it can’t run smoothly during the movement and hard to keep working condition etc. Aiming at these problems,a new six-bar leg-supporter mechanism is designed based on the theory of ergonomics,the mathematical model is established. Then the multi-objective optimization of mechanism is carried out by using Insight after the parametric design in ADAMS. According to the optimization results,the model is modified and simulated again,then comparing the data before and after optimization. The results show that after optimization,the new six-bar leg-supporter mechanism can run smoothly and meet the design requirement.关键词：Six-bar leg-supporter mechanism;Mathematical model;Link optimization;ADAMS/Insight
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发布时间：2022-10-20 - 摘要：The simulation analysis of a new inlet hole of a novel permanent magnet magnetic coupling wing cooling device is carried out. Firstly,the computational fluid dynamics software Fluent is used to simulate thermal field and flow field flow of three inlet opening holes of same area and same location,the optimum solution could be obtained through analyzing its maximum temperature rise and resistance. Secondly,the selected air intake scheme is tilt open holes,optimum tilt angle could be found by analyzing the relationship between different tilt angles from the maximum temperature rise and resistance. Finally,optimum aperture opening number could be selected by arranging the different number to analysis. Comparative results show that reasonable opened tilt inlet hole,the maximum temperature rise of the permanent magnetic coupling and the overall maximum temperature rise inside the permanent magnet could be effectively reduced,the temperature distribution in permanent is changed,the central hot zone temperature of outer rotor is reduced. It has some practical value.关键词：Permanent magnet magnetic coupling;Inlet hole;Fluent;Tilt opening hole
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发布时间：2022-10-20 - 摘要：In view of lacking precision measuring device for bevel gear and the cumbersome process of measuring process,a new integrated measuring device based on laser displacement sensor is developed. The composition and measurement principle of the measuring device are introduced,through the coordinate transformation of sampled data,the mathematical model of bevel gear tooth profile is obtained. The deviation between the actual tooth parameters and the theoretical value is calculated by the coordinate method,the pitch tolerance and the radial run-out of tooth ring are obtained. The measuring process can be simplified and the efficiency and precision can be improved by this method,the method can also be applied to the precision measurement of other cylindrical gear.关键词：Bevel gear;Pitch tolerance;Tooth ring radial run-out;Coordinate method
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发布时间：2022-10-20 - 摘要：The robot arm DH parameter calibration method based on calibration board is proposed,the 7points of calibration board can be sampled by using the end effector in sequence,among which the first 3 points are used to construct the relationship between world and robot coordination system while the other 4 points are applied to establish objective function and error equation. The DH parameter after calibration can be obtained by optimization solution of error equation. At last,the effectiveness of this method is verified through repeated positioning accuracy,the repeated positioning accuracy can be improved from 4. 68 mm to 0. 87 mm. This method has the advantages of simple equipment and easy operation.关键词：Robot arm;DH parameter calibration;Calibration board;Repeated positioning accuracy
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发布时间：2022-10-20 - 摘要：A novel self-stabilizing speed transmission used for wind power generation is proposed. It can keep the constant speed of synchronous generator amature under the time-varying speed of wind rotor. The self-stabilizing speed transmission consist of differential gear train,differential mechanism and constant speed motor. The time-varying speed of wind rotor and constant speed of motor are superimposed by the left wheel and right wheel of differential mechanism. The shell of differential mechanical can automatically adjust the output speed of differential gear train to stable. The kinematics analysis for the self-stabilizing speed wind turbine is carried out,and the mass-spring-damper model of the transmission is established for three shafts system with double inputs and single output. The simulation is executed in SIMULINK software with turbulent wind input.The influences on output shaft speed and torque under different inertia,stiffness,damping are discussed. The frequency of the output shaft speed is compared with natural frequency in order to evaluate the possibility of the system resonance.关键词：Self-stabilizing speed;Differential gear train;Differential mechanism;Wind turbine;Simulation
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发布时间：2022-10-20 - 摘要：The disassembly of the planetary carrier of a roller press planetary reducer is easy to cause damage to the hollow output shaft. Aiming at the repair of the damaged planetary carrier,a bilateral board planetary carrier is brought up. The repair scheme is proposed,the 3D modeling of the damaged planetary carrier is carried out by using Solid Works and using the simulation part of the software,the stress and displacement of the carrier are analyzed. The results show that,the maximum stress of the repaired planetary carrier is 306. 7 MPa,the relative displacement of the pin hole of planet wheel is 0. 09 mm. This result is able to satisfy the request of the strength and stiffness of planetary carrier. On conclusion,this repair scheme can meet the use requirement in practice.关键词：Bilateral board planetary carrier;Repairment;Finite element analysis;Stress;Displacement
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发布时间：2022-10-20 - 摘要：When point-line meshing gear is used in an automobile gearbox,it has the effect of reducing transmission series,increasing transmission ratio,enhancing strength,reducing noise,reducing volume and weight reduction etc. The parameter choosing transmission ratio distribution,calculating example and improved tooth number distribution of point-line meshing gears in an automobile gearbox are described. Several gearboxes are produced,and the noise is lower than involute gearbox,after using more than twenty months,the gearboxes run well and without tooth breaking and pitting.关键词：Point-line meshing gear;Automobile gearbox;Application
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发布时间：2022-10-20
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