最新刊期
期 1 ， 2016
- 摘要：The mathematical model of face gear grinding disc wheel is established according to the gear tooth surface formation mechanism analysis of surface roughness and morphology analysis of the disc wheel surface. Then,according to the grinding mechanism of face gear in the CNC gear grinding machine,the in- depth analysis of grinding movement relation between disc wheel and face gear is carried out,and the locus equation of grinding wheel abrasive cutting blade coordinate system is established,and then the M file is compiled to calculate the influence of different parameters on surface roughness value. By comparing calculation values with measured values,the maximum error in 11. 7%,the results show that the roughness model calculation values and measured values are basically identical.关键词：Face gear;Disc wheel;Grinding;Surface roughness
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发布时间：2022-10-20 - 摘要：Taking the 2K- H planetary gear train as object,the load balancing problem caused by manufacturing and assembly errors of 2K- H planetary gear train is studied by using the analytical method. The spring series parallel mechanical model of load transfer is given,based on the geometric equivalent relationship,the relations between load balancing of planetary gears and mesh clearance,meshing stiffness are derived. The vector method is also used to deduce the calculation formula of the meshing clearance of mutually meshing tooth on the meshing line which is a result of the deviation of circle center caused by the manufacturing error and assembly error. On the basis of the meshing clearance calculation formula,the floating piece balance load is analyzed,the multivariate equations of load floating computing is obtained,to solve the equations,the following conclusion is given:（1） When the number of planet gears n < 3,the gear train partial load of the basic member can be compensated by the error of the planet wheels.（2）When the number of planet gears n≥4,the errors of the planet wheels cannot be compensated by the basic components floating,only can be compensated through the floating planetary gear. At the same time,the method of theoretical calculation of the floating amount is given. And the finite element simulation is carried out,the results and the theoretical calculation results are highly consistent.关键词：Planetary transmission;Meshing clearance;Load sharing;Select of the floating piece
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发布时间：2022-10-20 - 摘要：According to the structural characteristic of 3- UPU parallel mechanism,by using a new numerical algorithm,the kinematics inverse solution of the mechanism is obtained. Through the compound derivation for the mechanism kinematics inverse solution,the Jacobi matrix of the mechanism kinematics is fast obtained. And the singularity analysis of mechanism is carried out,the three cases of singular configuration are obtained. At last,by using the limit search method combined with MATLAB software,the workspace of mechanism is obtained. A theoretical foundation for the study on the parallel mechanism parameters optimization is provided.关键词：Parallel mechanism;Inverse solution;Singularity;Workspace
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发布时间：2022-10-20 - 摘要：Aiming at the key issues of the clutch wear serious,the vehicle has great impact caused by clutch inaccurate control in the starting control of automatic mechanical transmission（ AMT）,taking the AMT clutch as the study object and reducing the impact degree and friction work as goal,a new kind of clutch engagement controlling strategy based on fuzzy control and self- adaptive control method is proposed. First,some uncertain parameters of clutch control are analyzed by using fuzzy control method,and then with the input parameters as the object,the fuzzy control rules is modified by the adaptive control theory. Through comparing different control effects between fuzzy controller and fuzzy adaptive controller,the validity of this controlling strategy is verified. The results show that,the fuzzy adaptive control is more accurate and effective than fuzzy control during start process by simulation and experiment,the impact intensity,friction work and friction plate wear of clutch can be reduced some extent,And the driving performance is significantly improved.关键词：Automatic mechanical transmission;Clutch;Control effect;Fuzzy adaptive control
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发布时间：2022-10-20 - 摘要：In order to give full play of the advantages of error accumulated small and fast running speed of the high speed Delta robot,the research of bar optimization for the Delta robot is need. Based on establishing the kinematics and dynamics of rigid body model of the system,the global dexterity and the shock vibration function of driving arm are defined,according to the actual work requirements of the Delta robot,the work trajectory is planned. By using MATLAB genetic algorithm toolbox,respectively with dexterity and shock and vibration function as fitness function,the optimal solution of global is got. Then,taking the obtained optimal solution as the upper and lower bounds,by using the weight factor transformation method,the multi- objective optimization of dexterity and shock vibration function is transformed into a single objective optimization,then according to the above method,a set of meet the scale parameter optimization objectives are synthesized,a reference for the Delta robot structure optimization design is provided.关键词：Delta robot;Dexterity;Shock and vibration;Genetic algorithm;Weight factor transformation method
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发布时间：2022-10-20 - 摘要：The friction plate gap as a key parameter which affects the towing torque is got by analyzing friction state of the hydro- viscous clutch and building mathematical model of the towing torque which combines with the specific parameter of the hydro- viscous clutch. The accuracy of the towing torque calculation model is verified by analyzing friction characteristic of hydro- viscous clutch and experimental study. The test of impact output torque is carried out which including towing torque,temperature and difference speed between two friction materials. It can be found through the test the towing torque of copper- based friction plate is about 2 times of the carbon- based friction plate with the same structure and the temperature of copper- based friction plate is higher than the carbon- based friction plate under the same experimental conditions and the change of friction coefficient with the difference speed is large. The relationship between the friction coefficient and the difference speed is fitted.关键词：Hydro-viscous clutch;Friction plate;Friction coefficient;Experimental test
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发布时间：2022-10-20 - 摘要：By using the finite element software ABAQUS,the finite element model of large diaphragm-rubber coupling is established,and the simulation and analysis of its static stiffness is carried out,the static torsional stiffness,radial and axial stiffness of the diaphragm- rubber coupling are calculated. Finally,through the establishment of the coupling stiffness calculation model,the calculation method of the contribution amount of couplings rubber block coupling components and the diaphragm components to radial and axial stiffness is proposed,the guidance for further study of the coupling design is provided.关键词：Diaphragm-rubber coupling;Static stiffness;Stiffness contribution amount
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发布时间：2022-10-20 - 摘要：Taking the 3- TPT parallel mechanism as study object,the dynamics of the 3- TPT parallel mechanism is studied. A formulation based on Kane equation is educed for the dynamics of the Stewart platform manipulator from the kinematics analysis of the model. The relation between velocity and acceleration of platform and driving bar are analyzed. Then the dynamics equations of the 3- TPT parallel mechanism is derived with the help of Kane equation. Finally,the simulation analysis of relationship between the driving force and time is carried outs by MATLAB software. The result show that,the driving force of 3- TPT parallel mechanism is changed periodically,and mutation in the acceleration and deceleration phases.关键词：Kane equation;Parallel mechanism;Dynamics
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发布时间：2022-10-20 - 摘要：In order to solve the problem of the dynamic low control accuracy and poor carrying capacity of vehicle traditional transmission ratio in the driving process,under the premise of ensuring the CVT use requirements,in order to improve the carrying capacity of the transmission system,the double conical CVT is introduced into vehicle transmission system,an adaptive fuzzy PID speed ratio control system of a new type of double conical CVT is proposed,finally the vehicle simulation platform is established,and the new double conical CVT adaptive fuzzy PID control system feasibility is researched. The results show that the new double conical CVT compared with traditional metal belt CVT has better carrying capacity,the adaptive fuzzy PID control model with double conical CVT vehicle compared to traditional PID control,the actual vehicle transmission ratio,speed are high consist with target transmission ratio,speed,which can effectively improve the control efficiency of a new type of double conical CVT.关键词：Double conical continuously variable transmission;Adaptive;Fuzzy PID control
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发布时间：2022-10-20 - 摘要：With the heated development of range- extended electric vehicle,a new kind of transmission with biaxial transmission is proposed,the study of parameter matching is carried out based on the national standard stipulation of dynamic and economic performance,and the parameter result is imported into MATLAB software to simulate. The simulation results show that proposed kind of transmission perfectly satisfy the national stipulation,and has a significant improvement of performance by comparing with the original vehicle transmission.关键词：Range-extended electric vehicle;New type of biaxial transmission system;Parameter matching;Dynamic performance;Economic performance
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发布时间：2022-10-20 - 摘要：A 8-DOF exoskeleton walking aid robot is designed,which can complete the walking motion in the sagittal plane. And the center of gravity can transfer in the frontal plane during walking through the transfer module of the foot center of gravity. The analysis of kinematics modeling is carried on to solve the relationship between the joint angle and the center of gravity of trajectory. Based on the theory of focus projection method,a gait planning method is proposed for the statically stable walking of the robot based on the gravity center track. The joint trajectory is solved and stability margin is verified through MATLAB simulation. The simulation results show the exoskeleton robot can walk with static stability.关键词：Exoskeleton robot;Configuration design;Gait planning;Static stability
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发布时间：2022-10-20 - 摘要：It is proposed that a fault diagnosis method for rolling bearing based on empirical mode decomposition（ EMD） and multivariate statistical process control（ MSPC）,the Hilbert- Huang transformation and principal component analysis（ PCA） are combined effectively in this method. It makes an effective classification for common bearing failure. The main contents are as follows: Firstly,the bearing signal is decomposed into intrinsic mode function under different frequency scale with EMD. Then,the PCA model of normal bearing with the IMFs is established and the control limits of Hotelling T2 of principal component model is calculated.Finally,take IMFs of signal to be detected into principal component model and the Hotelling T2 value is obtained. The fault detection with T2 value is realized and principal component model. On the base of correlation between IMF functions and various faults,the classification is realized. This study gives an effective method and theoretical support for fault diagnosis and classification.关键词：Rolling bearing;Fault diagnosis;Empirical mode decomposition;Principle component analysis
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发布时间：2022-10-20 -
Optimization Analysis of Structure Parameter of Angular- contact Ball Bearings based on Fatigue Life
摘要：According to calculated method of bearing fatigue life based on micro- area contact,a optimization model of structure parameters of angular- contact ball bearings is established. Taking an angular- contact ball bearing used in certain gas- turbine engine as the example,the influence rule of structure parameter on maximum contact stress,fatigue life and cage sliding ratio is analyzed. And the optimization scheme is further proposed based on the purpose of lifetime extension of bearings. The analysis results could provide reference for structure design of angular- contact ball bearing.关键词：Angular-contact ball bearing;Structure optimization;Fatigue life;Cage sliding ratio- 3
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发布时间：2022-10-20 - 摘要：Taking the large- scale wind power generator yaw bearing as studying object,the finite element model of the yaw bearing is established on the ANSYS platform. Considering the axial load and overturning moment coupling action on it,the static contact stress of rollers and raceways are analyzed,and the Hertz theory solution is given. Using the result of static analysis as the initial conditions of transient dynamics analysis,the operation process for horizontal- axis wind turbine yaw bearings is simulated,the dynamic response of the rolling elements,stress change on the rolling elements and the Mises stress dynamics changes of raceway during operation process are obtained. The results can provide a reference for the design and selection of bearing dynamic yaw.关键词：Yaw bearing;Dynamic response;Mises stress;Transient dynamics
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发布时间：2022-10-20 - 摘要：With the visual program design features of Visual Basic of being object- based and event-driven that contains integrated development environment,a motional simulation of the continuously variable transmission（ CVT） pulsing mechanism is carried out,the mechanical performance of the impulse CVT is studied from the motion simulation. A quadrilateral efficient pulsing mechanism is discussed.关键词：Visual Basic;Continuously variable transmission（CVT）;Quadrilateral;Pulsing mechanism
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发布时间：2022-10-20 - 摘要：A general searching method is presented for the optimum generative design of a cam curve.This method involves the use of Non Uniform Rational B- Splines（ NURBS） outputs for representing the follower motions,namely as displacement,velocity and acceleration. Using a numerical iterative approach optimized in a constraint and objective function set,the optimum design is obtained by simultaneously adjusting the multiple control points and weights of the NURBS parameters. The results yield to a generative motion that satisfy the prescribed terminal conditions that include performance criteria related to kinematic,geometry,pressure angle as well as undercutting property of the system. Particularly,this method can control not only the level but also the local shape of the motion curves to better performance property. The effectiveness of the approach is illustrated by comparing the results between the present method and the conventional curves for a disk cam- follower mechanism specified in Dwell- Rise- Dwell（ DRD） follower motion type. Example shows that the obtained cam profile provide a good solution for the strong coupling constraints in the cam optimization design.关键词：NURBS cam motion curve;Cam motion curve generative;Cam optimization design
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发布时间：2022-10-20 - 摘要：For improving the reliability and efficiency of the kineto- static analysis for hybrid driving linkage mechanism,the corresponding vector bond graph method is proposed. Based on the kinematic constraint condition of planar translational joint,the more concise vector bond graph model of planar translational joint is built. According to the adjacency relationship of the components of hybrid driving five bar linkage mechanism,the vector bond graph model of hybrid driving five bar linkage is established by assembling the vector bond graph model of planar moving rigid body,revolute joint and translational joint. For the algebraic difficulties brought by differential causality and nonlinear junction structure in automatic modeling and dynamics analysis of this kind mechanism,the effective bond graph augment method is proposed. Based on this,the unified equations of system driving moment and constraint force at joints are derived,which are more concise and practical.As a result,the computer aided kineto- static analysis of hybrid driving five bar linkage system is realized. By a practical example system,the reliability and validity of the proposed method is illustrated.关键词：Hybrid driving linkage mechanism;Translational joint;Kineto-static analysis;Vector bond graph;Bond graph augment;Causality
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发布时间：2022-10-20 - 摘要：A new robot is designed which has three degrees of freedom movement in the round plane and can passively cross the vertical barriers up to 2. 5 times radius of the wheel. The six drive wheels control are used in this robot,four Mecanum wheels with a rectangular arrangement are used in its body to make it have a omni- directional motion function in plane ground. The front and rear wheels of the robot uses omni- directional wheels,so that it can keep rolling state with the ground when cornering and lateral movement. The six wheels are mounted on an elevated body such as climbing linkage mechanism,climb mechanism,stable mechanism,,so it has a good stair climbing and obstacle functions. The general kinematics model of the omni- directional motion system is given,and the necessary condition for the realization of the omni- directional motion is the inverse of the Jacobi matrix with full rank. The structure and layout of the wheels for the omni- directional motion system is optimized and selected. The functions of the robot system including straight movement,lateral movement,zero turning radius and climbing the stairs are simulated based on the virtual prototype technology.关键词：Building environment;Omni-directional moving;Obstacle function;Movement mechanism;New robot
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发布时间：2022-10-20 - 摘要：In order to solve the design problem of variable ratio tooth profile of gear for the recirculating ball variable ratio steering,a digital design method is put forward,the Boolean reduction operation macro program is established based on variable ratio movement rule and the envelope surface generation machining processes of variable ratio tooth profile of gear is simulated in CATIA software,and the three dimensional model of variable ratio gear is generated. The tooth surface is repaired and the virtual assembly of variable ratio gear is completed,then the kinematics simulation analysis of variable- ratio rack and pinion meshing pair is carried out by using ADAMS software,the curve of simulation is analyzed and compared with the curve of designing,the effectiveness of the method is validated.关键词：Variable ratio gear;Recirculating ball variable ratio steering;Envelope principle;Generation simulation method
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发布时间：2022-10-20 - 摘要：The multifractal detrended fluctuation analysis（ MFDFA） is developed only for processing one- dimension time series. Consequently,when applied to analyze complex vibration data from a defective gearbox,the MFDFA frequently produces poor results due to disturbance from noise and other factors. As a result,high- dimension data analysis seems effective in solving this problem. To this end,multifractal detrended cross- correlation analysis（ MF- DCCA） is introduced to examine gearbox vibration data and then a novel method for fault diagnosis of gearboxes is proposed based on MF- DCCA. In the proposed method,a cross- correlation function of two- dimension signals is firstly estimated and then the multifractal feature hidden in the cross- correlation function are analyzed. Application to probing realist gearbox vibration data suggested that the proposed method can clearly distinguish between similar and close fault patterns of gearboxes and performs better than the method based on MFDFA in fault diagnosis of gearbox.关键词：Multifractal;Detrended cross-correlation analysis;Gearbox;Fault diagnosis
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发布时间：2022-10-20 - 摘要：The corner- filleted flexural hinge,the elliptical- rectangle flexural hinge,the parabola- rectangle flexural hinge and the hyperbolic- rectangle flexural hinge are used in the structure of the flexible T-typed coupling joint. In order to explore their load- bearing,the finite element model is set up based on the solid element SOLID92,and the corresponding boundary conditions are used. The results showed that,the load- bearing of the flexible T- typed coupling joint that made of the elliptical- rectangle flexural hinge is the strongest; the maximum bending stress,torsion stress and tensile stress is mainly depends on the minimum thickness,and all the stress decreases with the increase of the width and the minimum thickness,which keep the same with the results of the influence of the structural parameters of the elliptical- rectangle flexural hinge on its maximum bending stress,maximum torsion stress and the maximum tensile stress.关键词：Flexural hinge;Flexible T-typed coupling joint;Finite element method
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发布时间：2022-10-20 - 摘要：The kinematic characteristics of the ordinary geneva wheel mechanism are determined by the numbers of sheave groove. The drive crank of geneva wheel is the cycloid production mechanism which equals to the mechanism with a variable length,variable speed and along the cycloid moving crank and makes the kinematic characteristic of the geneva mechanism changed. The forming condition of the outside geneva mechanism with uniform movement are analyzed,then on this basis the design method and the mechanism parameters are proposed. The change rule of the uniform movement interval and the influence of movement coefficient on the width of approximate uniform movement interval and the fluctuation quantity of angular velocity in approximate uniform movement interval are analyzed,the calculation method of the width and the fluctuation quantity of angular velocity of the uniform movement interval are given.关键词：Geneva mechanism;Combined mechanism;Cycloid crank;Uniform movement
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发布时间：2022-10-20 - 摘要：In order to improve the efficiency and accuracy of the reducer design,a technology of parametric variant design based on case based reasoning which put case based reasoning technology and the parameter technology of object oriented into the reducer variant design is put forward. A reducer 3D design system is developed by taking Solid Works as a development platform and VB as the development tool,combining the key technology of three dimensional modeling method that combine the feature modeling and parametric design,the nearest neighbor algorithm for computing similarity,and the parametric variant design based on layout sketch.The automatic retrieval,design calculation,model- driven and plot for the reducer is realized,it provides an effective way for the fast intelligent design of the reducer.关键词：Case based reasoning Parameter;Variant design;Reducer Layout sketch
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发布时间：2022-10-20 - 摘要：The RV reducer is the key component of industrial robots,and the dynamic characteristic is the core problem of its structure design. As the characteristics of the complicated structure of RV reducer and the difficulty in theory modeling,based on virtual prototype technology,the dynamics model of RV reducer is established by using Pro / E parametric modeling and ADAMS software. With the pin gear and cycloidal gear meshing force as the goal,the influence rule of the design parameters on meshing force is analyzed. The results show that with the number of cycloidal gear tooth,the short amplitude coefficient and the pin gear center distribution circle radius increase,the meshing force decreases. The relationship between meshing force and pin gear radius is nonlinear. And the number of cycloidal gear tooth,the short amplitude coefficient and the pin gear center distribution circle radius are the main factor affecting the meshing force,the effect of pin gear radius is relatively small. The influence of each parameters on RV transmission is also analyzed. The result is important to the design of RV reducer.关键词：RV reducer;Pro/E;Adams;Meshing force;Dynamics analysis
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发布时间：2022-10-20 - 摘要：The Locati method is used to explore the influence of modification parameters on the fatigue property of gears. The corresponding bending stress of meshing gear with staggering tooth is obtained by using the Romax software,then the bending fatigue strength for gears with different modification parameters are obtained according to experimental data by using Matlab. The results show that the appropriate addendum modification can improve the bending fatigue life of gear with the given conditions,which provides the basic reference data for modification in the application of gear.关键词：Gear;Modification;Bending fatigue
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发布时间：2022-10-20 - 摘要：By taking the AMT transmission shifting- gear case as a studying object and taking the influence of the engine and road vibration into account,the vibration load spectra of AMT are collected in Xiangyang Proving Ground through reasonably installed the sensors. Besides,the pretreatment and repeatability checking of load spectra is carried out. Through the comparison of different load spectrum stress,it is found that several measuring points are dangerous point,so that should focus on these place when designing. Combining with the fatigue damage theory,the fatigue life of target point is calculated and analyzed,and it has an important significance to improve the reliability of product.关键词：Shifting-gear case;Sampling;Load spectra;Fatigue life
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发布时间：2022-10-20 - 摘要：For analyzing the influence of related factors on gear thermo- elastic coupling deformation,based on the response surface method and the sample- point test method,the function relation between the gear thermo- elastic coupling deformation and related factor is constructed,gained by analyzing,the influence factors of tooth width,rotational speed,torque,boundary temperature on gear maximum thermo- elastic coupling deformation are- 0. 207,0. 273,0. 321 and 0. 199. According to the size and the positive and negative of these influence factors,the boundary temperature,tooth width,speed and torque have larger and larger influence on maximum deformation. The maximum deformation increased with the rotational speed,torque and boundary temperature,and decreased with the tooth width.关键词：Response surface method;Gear;Thermo-elastic coupling deformation;Influence factor
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发布时间：2022-10-20 - 摘要：The elastohydrodynamic lubrication geometric model of surface texture bearing is set up. The numerical simulation of elastohydrodynamic lubrication property of water- lubricated tenmat bearing with circular dimple,rectangular dimple and triangular- rectangular dimple is carried out. The results show that,considering the bearing surface texture makes pressure and film thickness oscillating,the pressure peak and the minimum film thickness decreased. The minimum film thickness is decreased with the increase of slip,the minimum film thickness of circular dimple texture is larger than the rectangular dimple,far larger than the triangular-rectangular dimple. With the increase of the dimple depth,the oscillating of pressure is not obvious,the oscillating of film thickness increased,the minimum film thickness decreased. The bearing with triangular- rectangular is detrimental for lubrication.关键词：Lubrication of tenmat bearing;Water lubrication;Surface texture;Thermal EHL
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发布时间：2022-10-20 - 摘要：In order to study the change law for Stribeck curve of the sliding bearings under different loads,the pin disc friction test rig is established,the thickness of oil film and friction coefficient are collected by changing the load and speed. The curve of friction coefficient and pressure,speed,viscosity,namely Stribeck curve are plotted by using the MATLAB. The experimental results show that,with the increase of the speed,the friction coefficient decreased at first and then increased. The smaller the load,the sooner enter into the bottom of Stribeck curve,the easier to achieve fluid lubrication,the bearing lubrication state can be improved effectively by changing the load of bearing.关键词：Slider bearing;Load;Stribeck curve;Friction coefficient
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发布时间：2022-10-20 - 摘要：In order to find the cause of an elevator reducer output shaft fracture,the chemical property,mechanical property and material property are obtained through the experimental method,the theoretical calculation of stress,fatigue strength and fatigue life are carried out. The fatigue analysis of keyway with different curvature radius carried out by using the finite element method（ FEM）,and comparing with the theoretical result,it is concluded that the reason of fracture is higher notch effect of low curvature radius on the keyway. The results show that high stress on axes keyway corner decrease with the increase of curvature radius,as the fatigue life become longer.关键词：Fatigue analysis;Drive shaft;Failure;FEM
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发布时间：2022-10-20 - 摘要：A certain type of two- input planetary gear of spacecraft steering gear system is described. By considering the influence of tooth thickness deviation,central distance deviation and bearing radial clearance on the backlash,the quantitative analysis of the two- input planetary gear return difference is carried out,the calculation expression of its return difference is given. According to the return difference analysis,by using the method with matching center distance to control return difference precision of prototype,through the test of prototype return difference,the experimental results are consistent with expectation.关键词：Two-input planetary gear reducer;Idle stroke return difference;Prototype test
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发布时间：2022-10-20 - 摘要：Aiming at the globoidal cam indexing mechanism,considering the influence of elastic deformation,bending and twisting factor,combining the knowledge of rigid- flexible coupling dynamics system,a rigid- flexible coupling model of indexing cam mechanism is established by using the Pro / E,ADAMS,ANSYS,and the model is analyzed,a detailed description of the effects of speed,load on the dynamic performance of mechanism is carried out.关键词：Globoid indexing cam mechanism;Rigid-flexible coupling;Dynamics analysis;Adams
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发布时间：2022-10-20 - 摘要：In order to improve the efficiency and reliability of the scraper conveyor chain drive system parametric design,the finite element mathematical model is built and the parametric analysis and calculation is carried out by using the software interface of optimizing design for scraper conveyor developed on the basis of VB by calling database information and using com pieces interface technology of Matlab. The example analysis shows,the professional parametric analysis software,not only can conduce to users who are unfamiliar with the Matlab software,but also make it more convenient for researchers to further Matlab secondary development. And the analysis of scraper conveyor is simplified,the efficiency of the analysis and designand the reliability of the scraper conveyor are improved. The designing of the software can analysis the two conditions of the scraper conveyer,which are load and failure load. Moreover,the scraper conveyor chain jammed failure load tension variation distribution and velocity variation distribution are analyzed,which provides some reference value for the research of super heavy high- power scraper conveyor chain drive system.关键词：Scraper conveyor;VB;Matlab;Chain drive system;Chain jammed
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发布时间：2022-10-20 - 摘要：In view of the U- type slide constrained chain conveyor,the impact of the load gravity under the extreme position is analyzed. The position which the chain carries a different number of load and the chain moves to different positions may make different results. By using the method of moment and with the help of MATLAB,the change of pin shaft bearing is calculated. Then the limiting cases of the chain pin shaft under the gravity load are got. According to the analysis of the pin shaft stress and the driving moment features,the location where the maximum driving moment appears and the size of the reaction are got. It provides a basis for the type of driving and device selection. At the same time,it provides data base for related structural strength design of conveying equipment.关键词：U-type slide;Constrained type chain;Chain dynamics;Matlab
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发布时间：2022-10-20 - 摘要：Based on the basic principles of heat transfer and thermal elastic- plastic theory,by using finite element method,the heat treatment analytical model of spiral bevel gear is established. The influence of carburizing quenching process on tooth residual stress distribution and deformation is simulated by DEFORM software. The variation law of microstructure,residual stress and tooth deformation with time in the carburizing quenching process are obtained. The influence of different quenching temperature on tooth residual stress,deformation and performance is researched. The simulation results show that the compressive stress on tooth surface and the tensile stress on core portion are formed after heat treatment. The tooth surface residual compressive stress is increased with the quenching temperature. This can improve the fatigue property and performance of spiral bevel gear. The analysis of tooth surface deformation can provide certain theoretical guidance for the subsequent spiral bevel gear grinding process parameter.关键词：DEFORM;Spiral bevel gear;Carburizing quenching;Residual stress;Deformation
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发布时间：2022-10-20 - 摘要：Based on the dynamics research of wet friction clutch,the engagement heat flux of friction clutch is calculated by friction power method,and the heat convection of wet friction clutch is discussed. The model of friction plate is established by using the finite element method,and the temperature field and the stress field of its are analyzed. The results of thermo- mechanical coupling field show the radial temperature of friction plate increase with the increase of radius,the thickness direction temperature is close to the surface region of friction plate. The circumferential tensile stress appears in the region close to the outer edge,while the circumferential pressure stress appears in the region close to the inner edge. The radial pressure stress is in the friction surface,and the radial tensile stress is in inner region of friction plate. The result provides the theoretical foundation for the thermal failure analysis of friction clutch.关键词：Friction clutch;Friction plate;Finite element;Thermo-mechanical coupling analysis
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发布时间：2022-10-20 - 摘要：The principle of crank and connecting rod mechanism for the flying shear gear box is analyzed,and a general model of maximum shear torque is deduced for this mechanism. The power flow of the transmission unit is also distributed according to the work- energy transformation principle in a full shear cycle. On this basis,the FEM force calculation and improvement of the flying shear gear box are carried out. The case study indicates that shear gearbox with single flywheel has the asymmetric characteristic,and the improved gearbox has better rigidity distribution and reliability.关键词：Flying shear gearbox;Single flywheel;Four bar mechanism;FEM calculation
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发布时间：2022-10-20 - 摘要：As to the fault diagnosis difficulty caused by the fact that fault feature is possible not obvious in mechanical transmission system,a method based on variational mode decomposition and FCM is proposed for gearbox condition monitoring. Firstly,the state data of the gearbox is decomposed into different modes,and the singular value of each mode is used as the feature value,and the state is identified by fuzzy clustering. The results show that the fault identification rate is above 86% for the gearbox fault of artificial unable to identify,and the condition monitoring based on the method can provide reference for the gear fault warning and severity.关键词：Variational mode decomposition;FCM;Gear;Mechanical transmission;Condition monitoring
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发布时间：2022-10-20 - 摘要：From the analysis of design on modification coefficient and helix angle of gear of tube mill,the new design concept of small displacement,low slip ratio difference and the small helix angle is elaborated. The allocation method and precautions of helix angle selection on total modification coefficient for gearare described.Through the analysis calculation and comparison with practice,it concluded that the value of optimizing of distribution on total variation coefficient can be obtained based on the calculation by computer program. Not only the slip rate differential Δη is very low and the sliding wear is reduced,but also has a higher degree of coincidence and the contact stress is low which can satisfy 0 < x < 1,thus the manufacturing cost can be reduced. At the same time,the small helix angle（ 2° 4°） for gears of tube mill can be contribute to improve carrying capacity of gear and not produce excessive large axial force.关键词：Tube mill;Gear;Modification coefficient;Helix angle;Coincidence degree;Slip ratio difference
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发布时间：2022-10-20 - 摘要：In order to solve the problem of fault diagnosis of marine gear,a method of comparing 2- D slice of tri- coherency coefficients figure under different frequency of vibration is proposed. Through the sampling data of vibration of marine gear,the tri- coherency function deal with is carried out after preprocessing.The 2- D slice of tri- coherency coefficients figures of data of working vibration of marine gear system are compared under different frequencies,and the result is different obviously. Experiments show that the analysis and diagnosis of 2- D slice of tri- coherency coefficient spectrum are applied to the fault characteristics,which can improve the correct rate of the identification and diagnosis of different fault in some special conditions.关键词：Marine gear;2-D slice of tri-coherency coefficient;Frequency;Fault diagnosis
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发布时间：2022-10-20 - 摘要：The main reason for the transmission performance degradation of harmonic reducer is the wear of flexible wheel,and the research of failure mechanisms of flexible wheel provides a reference for design and manufacture of harmonic reducer. By research progress introduction of space lubrication and failure mechanisms of harmonic drive reducer at home and abroad,comparing the research results of different lubrication method,then the existing problems of wear failure mechanism of flexible wheel and its future research direction of friction and wear mechanism are proposed.关键词：Harmonic reducer;Flexible wheel;Wear;Space lubrication;Failure mechanism
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发布时间：2022-10-20 - 摘要：<正>根据近年来国内外汽车和通用机械无级变速器（CVT）的创新和发展,为交流学术技术成果,促进各种CVT的研究、开发和应用,拟召开全国第十二届机械系统变速器（CVT）及在汽车变速技术中应用学术信息年会会议。一、会议内容1、国内外汽车和通用机械无级变速器CVT的发展及应用;2、创新型汽车CVT的研发及应用;3、创新型通用机械无级变速器CVT的研发及
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发布时间：2022-10-20 - 摘要：<正>CHMTI重庆机床重庆机床（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
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发布时间：2022-10-20
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