最新刊期
期 5 ， 2015
- 摘要：Based on the theory of multi-body system and the principle of gear meshing,according to six-axis five linkage gear CNC machine structure and the actual conditions of grinding,the grinding tooth surface equation of face gear with error of six-axis five linkage CNC machine is established.Through the simulation,the influence of the grinding wheel spindle kinematic pair on different error sensitive direction is analyzed,the results show that the feed axis B5 relative to machine tool bed B1 moving has larger effect on the tooth profile machining of face gear.A prejudge theory for CNC grinding to improve the machining precision and modified tooth surface error is provided.
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发布时间：2022-10-20 - 摘要：In order to analyze the influence on absolute positioning accuracy of kinematics parameter errors of the delta parallel robot,apose error model is established and solved.Taking the transmission branch chain as serial mechanism,the kinematics model is solved by establishing D-H transformation matrix.By bringing the micro displacement of the slave arm into the D-H transformation matrix,on the basis of the uniqueness of the pose error of the mobile platform,the error model is established in the form of linear equations.In the end,taking a type of delta parallel robot as example,this model is validated by analyzing the pose error that caused by angle error of the gearbox mounting end face.This pose error model can serve as an analysis tool for the further research of precision analysis and error compensation.
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发布时间：2022-10-20 - 摘要：At present,there are not unified formula for static strength to calculating the gear load and contact capacity of micro-segment gear,and also no specific research and analysis for gear load and contact capacity.By using the non-contact strain measurement system ARAMIS,the contact stress of the micro-segment gear under the condition of static loading is measured,and under the same experiment condition,the strain analysis of the location near the gear mesh point and tooth root of micro-segment gear and involute gear are respectively carried out,the principal strain figure of the gear end face is obtained.The force analysis of location selection on the same point of the two kinds of gear tooth profile are carried out,and the force condition of the two kinds of gear tooth profile are compared.
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发布时间：2022-10-20 - 摘要：On the basis of the dynamics analysis of range-extended hybrid electric vehicle,under the particular condition,taking the most efficient of system as optimization object,the rule of mode shifting of range-extended hybrid electric vehicle is built.Based upon with the MATLAB/Simulink simulation platform,the simulation model is established,the simulation results show that the vehicle economy fuel and dynamics are both boosted by this energy management strategy.The test rig of hybrid system based upon the Matlab/Simulink Simulation platform and dSPACE hardware-in-the-loop is set up.And the data acquisition and control system is developed.The energy management control strategy of RE-HEV at particular drive cycle is validated by experiments.
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发布时间：2022-10-20 - 摘要：The dynamics model of the cylindrical gear transmission system is built in consideration of the time-varying mesh stiffness and gear errors.The dynamic load of the bearing is taken as the excitation,the vibration and noise radiation of the gear reducer is researched by using FEM/BEM,then the time history of node vibration displacement and noise spectrum of the gearbox are obtained,and the effect of the excitation of frequency doubling of mesh frequency on the gearbox vibration and noise radiation are illustrated.The effect of bearing stiffness and helix angle on vibration and noise radiation are researched,then the rule of dynamic load with bearing stiffness,the rule of noise radiation with bearing stiffness and helix angle are obtained.The study provides useful theoretical guideline to the design of the gearbox.
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发布时间：2022-10-20 - 摘要：Based on the coordinate transformation and meshing theory,the tooth surface equation of face gear is deduced.The finite element model of the different parameters（pressure angle,modulus）of face gear transmission is built,the influence of tooth face parameters on tooth root bending stresses,contact area and the distribution rule of bending stresses along the direction of tooth height and width are analyzed.Based on modified local stress-strain method,the fatigue crack initiation life in different roughness of grinding and milling tooth face is calculated.And the fatigue crack propagation life is predicted with damage tolerant design method.The results prove that the pressure angle has a great influence on the tooth face bending fatigue life,especially for the crack initiation life.A larger pressure angle is helpful to improve the tooth face bending fatigue comprehensive life.In addition,grinding method is more conducive to improve the tooth face bending fatigue life than milling method.This study provides a basis for the anti-fatigue design of face gear.
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发布时间：2022-10-20 - 摘要：The isogeometric analysis method（IGA）is expanded to frictionless contact problem.The contact constraint is introduced into the system potential energy function by using the penalty function method.The modeling and contact analysis of the involute gear are carried out by using the type of the multi-patch NURBS curved surface piece stitch.The result from IGA model is compared with that calculated by finite element model,and which shows that proposed method has advantages including high precision of calculation and smooth stress field,and an effective method for solving contact problem is provided.
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发布时间：2022-10-20 - 摘要：Based on the hypothesis of stretch small distortion and distortion congruity,the model and algorithm of meshing force analysis under theoretical conditions are given.According to the Hertz theory and geometric relation of meshing pair,the meshing rigidity models of the meshing pair are established,and the calculation formulas of the meshing rigidity and the principal curvature of the contact point are deduced.The presented methods is illustrated through an example,and the distributing characteristic of meshing forces,sum of principal curvature and meshing rigidity of this type of transmission device is acquired.The acquired result can be adopted as the analytical base for structure design,vibration analysis.
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发布时间：2022-10-20 - 摘要：In comparison to the industrial countries,our design principle and approach of wormgear hobs are not completed.There are no clear and accurate equations of worm-gear hob design,so do equations of machine settings of hob after re-sharpening.The basic principles of worm-gear hob design is presented,equations of hob size increase and machine settings of hob after re-sharpening based on the equations used in America gear industry are introduced,and finally,the error distribution between theoretical and hobbed tooth surfaces of worm-gears are analyzed.All provide the advanced technology of worm-gear hob design and manufacturing worm-gears for our gear industry.
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发布时间：2022-10-20 - 摘要：The feature extraction is crucial for fault diagnosis,although the existing feature extraction methods in time domain,frequency domain and time-frequency domain are effective,it is also necessary to find new methods in other domain.On the basis of the characteristic of snow images generated by analyzing SDP（Symmetrized Dot Pattern）method,a feature extraction method based on image processing are put forward.Firstly,the original vibration signals are transformed into snow images in polar coordinate by SDP method.Then,the shape features of the snow images in different fault pattern of rolling bearing are extracted by using image processing technology,and the characteristic parameters are analyzed.Finally,BP network are created to realize fault pattern recognition.The experimental results show that this method is effective.
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发布时间：2022-10-20 - 摘要：The coordinate systems for the processing and driving of the profile-shifted spur pinion with double-crowned and the profile-shifted face gear are established,the tooth surface equations of the profile-shifted pinion and the profile-shifted face gear are deduced,while the tooth surface is simulated for visualization.The modified tooth surface is precisely represented by a sum of two vector functions that determine the theoretical tooth surface and deviation surface.The tooth contact analysis is conducted for the alignment errors of the driving system,and the tooth contact path and the transmission error are computed.The results show that it enables the transmission error to form second order parabolic function with opening down through this method,the sensitivity of contact patch for the alignment errors is reduced,and the meshing performance of profile-shifted face gear drive is improved.
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发布时间：2022-10-20 - 摘要：To the problems of flexible bearing has an important effect on the carrying capacity,transmission accuracy and life of the harmonic gear drive,a flexible bearing is regarded as the research object,the dynamic and contact characteristics of flexible bearing are analyzed based on ANSYS/LSDYNA nonlinear contact analysis method for comprehensive consideration of the factors such as bearing rotating speed,load and deformation and so on.The results show that the dynamic characteristics of flexible bearing outer ring in different positions are basically the same,the moved distance of rolling in long axis different distance is basic same,the velocity wave troughs alternating changes and the velocity decreases with increasing distance.The outer ring,rolling body stress concentrated near the long axis,stress wave troughs alternating changes,the stress value decreases away from the long axis;the rolling element and contact force on inner and outer is volatile,and basically the same with external load,and the keep contact force size is less volatile.
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发布时间：2022-10-20 - 摘要：For the problems of high energy consumption,low utilization in ship sailing process,a new type of ship-loading energy circulatory system is presented,the system with the process of the flow field around the sports field of the ships as a power source kinetic energy is transformed into electrical energy.In the model,according to the changing of the sailing process state,the DMC-PID mixed prediction control algorithm is introduced to adjust the transmission ratio of belt drive in the system.Finally,the variable law of the belt drive parameters characteristic and performance indicators of the ship-loading energy circulatory system under the condition of transmission ratio under control are studied.The results show that the designed novel ship-loading energy circulatory system is feasible through analysis of performance indicators,since the introduction of variable transmission ratio belt drive system and DMC-PID control system in the energy circulatory system,the performance of the system is improved.
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发布时间：2022-10-20 - 摘要：A newly developed plug-in hybrid electric vehicle is taken as research object and the vehicle simulation model is built by using CRUISE on the basis of completing the match of transmission parameters and control strategy design.An optimization model of plug-in HEV parameters is set up,applying optimization software Isight to integrate with CRUISE model.The constraints of the model are the designed power performance and the objective function is the fuel consumption and emission performance.The particle swarm optimization is applied to optimize the transmission system parameters and the control strategy parameter simultaneously.Compared the simulation results demonstrate that fuel consumption per hundred kilometer of PHEV is reduced by 12.5%and equivalent fuel consumption is reduced by 10.7% under UDDS driving cycle after optimization.
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发布时间：2022-10-20 - 摘要：For improving the stability and security when the plate quantitative conveyor start-up and the accelerating operation,the calculation problem of driving force of chain drive system is studied.The maximum static tension of the chain drive system on stable operating conditions is calculated by point by point calculation method.The multi-axis electric drive system conversion method is proposed and the acceleration load is calculated by converted the inertial resistance of linear moving parts and rotating parts to drive shaft.The maximum driving force is sum of maximum static tension and the acceleration load.The results show that,the acceleration load account for the driving force about 35%,the drive power and breaking force calculation is necessary to consider the impact of the acceleration load in addition to the maximum static tension.
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发布时间：2022-10-20 - 摘要：According to the design pattern,two analysis models of elastic torsion shafting and split torque transmission system with elastic torsion shafting are established with Romax.A study on characteristic of force transmission and load sharing of elastic torsion shafting is carried out.The modal analysis is also carried out for split torque transmission system with elastic torsion shafting.The study results show that the main flexible shaft is subjected to torque but not influenced by bending moment.The elastic torsion shafting has better characteristic of load sharing than common duplicate gear shaft.The running condition of system with elastic torsion shafting is out of resonance region.The study results are a theoretical guide for engineering design and dynamic analysis of this split-torque transmission system.
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发布时间：2022-10-20 - 摘要：A new method for solving planar parallel robot workspace boundary is described.These position kinematics equations are derived from the analysis of planar parallel robot.The boundary points along with the workspace boundary is searched depending on the existence of inverse solutions for these position kinematics equations.All the boundary points can be simulated based on Matlab,the simulation is the same graphic with geometric mapping.More accurate,clear workspace boundary can be obtained by this method.
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发布时间：2022-10-20 - 摘要：With the help of Auto CAD,the transposition linkage mechanism of wheelchair-hand control system used for the elderly and disabled is designed by using graphical method.The mathematic model of the mechanism is built,the correctness of the design result is verified by using the analytical method.The mathematic model of the mechanism is built in ADAMS,and the kinematics simulation is carried out,the various positions of the requirement of the transposition linkage mechanism of wheelchair-hand control system are obtained.It is shows that the mechanism meet the challenge of motion continuity and without malposition and re-ordering problem,the useful reference for verifying the feasibility and rationality of design scheme is provided.
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发布时间：2022-10-20 - 摘要：In order to overcome the defects of traditional serial hip joint testing machine on high speed,complex motion simulation and large dynamic loading,aparallel hip joint testing machine with a3SPS+1PS spatial parallel manipulator as the core module is developed.The complicated forward position solution and the singularity are significant difficulties of its application.An analytical model of forward position analysis is built with the coordinates of hinge points on the moving platform and a univariate polynomial equation of higher degree is obtained,proving that there exist 8forward solution for a single input at most.The singular status of the testing machine under required motions is investigated according to the Jacobian matrix.The two singular points are proved to be the forward singularities caused by the overlaps of the forward position solution.Then the corresponding avoidance strategy is given.
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发布时间：2022-10-20 - 摘要：Taking the 7shafts transmission of an engineering machinery as the research object,the multi-objective optimization research of the transmission is carried out.According to the structure and parameter characteristics of the transmission,the transmission gears are grouped and the mathematical model of optimization is established,which is based on reducing weight,improving the stability and reducing the maximum center distance of shafts.Then the transmission is optimized by using the MATLAB optimization toolbox and optimization results are achieved and verified.The results show that the transmission size and weight are reduced and the stability of the transmission is improved.
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发布时间：2022-10-20 - 摘要：The hybrid electrical city bus has two power sources to drive vehicle,so the control of vehicle driving mode transformation is become the core of the vehicle control strategy.It not only influences the vehicle fuel economy and emissions,but also influences the driving comfort of the vehicle.An HEV simulation model is built for performance analysis by interlinking of advanced software AVL CRUISE and Matlab/Simulink.By adjusting threshold of the driving mode transformation,the mode can be transformed smoothly.For achieving minimum equivalent fuel consumption,the genetic algorithm（GA）optimization method is applied to get the optima of control parameters which affect the vehicle driving mode transformation in different city bus cycles including Europe and China.The vehicle fuel economy is further improved.
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发布时间：2022-10-20 - 摘要：The deficiency of mixed discrete variables for the current optimal design is analyzed.A variable transformation method for mixed discrete variables is proposed,that is nominal variables are set,and software or algorithm of continuous variables could be called for mathematical model.The variables transformation program is written according to their relationship with real variables.Then,the nominal variables are put into the objective function and constraint condition,and the optimal solution is got.The variables of the optimal solution and real variables have the same type,so,it needn’t to be rounded and ensured the accuracy of the optimization.The variable transformation method is applied into optimization design of spur gear transmission,and compared with the existent ordinary optimization methods.The obtained results show that the variable transformation method is simple and feasible and the optimum solution of the variable transformation method is superior to solutions of other algorithm.
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发布时间：2022-10-20 - 摘要：Because of the cartoning machine has different box size,feeding cam size,stroke and other parameters are changed,the feeding cam need to be replaced frequently.The traditional CAD/CAM software is both time-consuming and difficult to design the cam.On the basis of secondary development tools of UG,the software system of cam parameter is developed combined with VC++6.0.Through running show that the system has a good human-computer interaction,users only need to input the key parameters to modify can get the new three-dimensional model,the design time is reduced and a cam parametric design is achieved.And a reference for cam CNC machining,simulation design and manufacturing and parametric design is provided.
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发布时间：2022-10-20 -
Kinematics Analysis of the Leg-wheel Walking System of Engineering Machinery with Variable Structure
摘要：The kinematics model of walking system with variable structure of engineering machinery is established.The forward kinematics analysis and inverse kinematics analysis of right front leg is conducted,the explicit formulation of the position,velocity and acceleration at the end of right front leg is obtained.With the inverse kinematics analysis,the revolute angle of each joint in the right front leg is got with given end location of right front leg.Based on the kinematics analysis,the working space of the right front leg is solved through Monte Carlo algorithm by Matlab.- 4
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发布时间：2022-10-20 - 摘要：For the issues of braking efficiency of the brake drum of engineering vehicle decline during use,taking the bi-directional-servo brake as research subjects,the calculation formula of brake braking efficiency is deduced.On this basis and combining with the actual object of key parameters and considering the interference of each parameter and manufacturing tolerances factors,the design of the model is optimized through robust optimization theory.Finally,the optimization model is validated through the finite element calculation.
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发布时间：2022-10-20 - 摘要：On the basis of the study of contact mechanics and kinematics of precision steel ball transmission,the minimum film thickness formula of precision steel ball transmission meshing vice is derived by applying Hamrock-Dowson formula.The influence rule of the basic parameters such as the short amplitude coefficient of cycloidal tooth profile,rolling circle radius and steel ball radius on the meshing pair minimum film thickness is studied by applying numerical calculation method.The lubrication condition of meshing pair is analyzed and discriminated,the calculation method of the parameter selection of meshing pair in a state of complete elastohydrodynamic lubrication is proposed with calculating the range of the basic parameters.The theory basis of design and application for precision steel ball transmission is provided.
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发布时间：2022-10-20 - 摘要：The self-excitation of the spring clutch is realized through the pre-compression between the excitation coils at either end of the spring and housing to generate frictional torque to energize the spring.The pre-compression amount of excitation coils at either end of the spring has a great impact on the binding property and lifetime of spring clutch.The spring clutch dynamics model is established by using the finite element analysis method.On ABAQUS platform,the speed synchronization of high speed spring clutch output shell and the input shell,the Mises stress and radial displacement of spring under different pre-compression are solved,and then the pre-compression amount condition of the self-exciting meshing of the spring clutch is obtained,and it is compared with the critical amount of pre-compression of clutch obtained by the analytic solution.Besides,the finite element analysis results show that the steady state stress distribution of spring exhibits M shape,that is,the transition coils have peak stress while the middle coils have uniform stress distribution.The basis for optimal design of spring clutch can be provided.
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发布时间：2022-10-20 - 摘要：There inevitably existed multi-correlated failure modes in the mechanism motion process,and these modes are expressed as functions of random variables.Firstly,a reliability calculation model for the mechanism motion under multi-failure mode is built and solved.Secondly,taking the rotating guide-bar mechanism as example,the calculation solution of the motion accuracy reliability under multi-correlated failure mode is carried out based on the method of Monte Carlo.Lastly,the guide-bar mechanism reliability curves under different times are got,and the theory foundation for mechanism dynamic optimum design is provided.This method with high accuracy,has some theory meaning and application value.
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发布时间：2022-10-20 - 摘要：In order to realize the functions of remote control cutting coal and rock,and intelligent remember shaping,it is necessary to study the kinematic characteristics of cutting tooth of EBH300 A roadheader during operation.According to the engineering design of EBH300 Aroadheader prototype,the 3Dsolid model and virtual prototype are built with Pro/E software.The mechanical system dynamic analysis software is used to simulate the displacement,movement based on the parameters of the EBH300 Aroadheader,in which,the motion displacement,velocity and acceleration of cutting tooth on the cutting head are provided.
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发布时间：2022-10-20 - 摘要：Due to the complexity of light truck powertrain vibration shape,the structure weak parts is easy to motivate and cause resonance phenomenon.In order to obtain the powertrain dynamic characteristics,by using the finite element method and PolyMAX method,simulation and experiment modal analysis for light truck powertrain are respectively carried out.By analyzing and comparing the results of both,the dynamic characteristic of the light truck powertrain is effectively reflected,the reliability and rationality are proved.The theory basis for the fault diagnosis and dynamic optimization design of the light truck powertrain are provided.
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发布时间：2022-10-20 - 摘要：The magnetorheological effect of magnetorheological fluid reduce under a high temperature condition,which causes so many problems like the uncontrollability of the variation of shearing stress,and even failure of the transmission device.Based on the rheological property of magnetorheological fluid and the temperature characteristics of shape memory alloy,a composite transmission device of magnetorheological fluid and shape memory alloy is designed,which rely on magnetorheological fluid to transfer torque under a lower temperatures condition,shape memory alloy spring assisted power transmission when the magnetorheological performance reduce under a high temperature condition.The performance of drive force transmission device is analyzed,and the formula of power transmission of transmission device is derived.The study results show that the composite transmission device can work at the external magnetic field and the temperature control,the torque can maintain continuous,controllable under a high temperature condition,the stability and efficiency of transmission device are improved.
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发布时间：2022-10-20 - 摘要：A CFD model of a variable displacement external gear pump is established.The quantitative analysis method is applied to analyze characteristics of the pump inner flow field.The accuracy of the established model is verified by comparing the flux simulated and corresponding tested data.The tooth width formula of gear meshing is obtained.Through oil pressure analysis in the trapped oil area,an optimization scheme with a wedge-shape unloading groove added at the upper piston of the driven gear is proposed,which effectively reduces the pressure fluctuation of trapped oil area.The study results show that,under the condition of the same pump flux,the optimized unloading groove can reduce the pressure fluctuations in the suction and discharge chambers by 12.3% and 8%,respectively.The work is helpful for design and development of the variable displacement external gear pump.
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发布时间：2022-10-20 - 摘要：The alternating transient temperature field will be caused during the braking of disc brake.The emergency braking condition under different speed of an FASE racing car is analyzed by using direct thermo-elastic coupling function of the ANSYS 14.0,the coupling effect between temperature field and stress field can be more actually reflected.Through the simulation analysis,the temperature distribution of brake disc and friction plate at different moments and the time course curve of the temperature on different nodes are gained.
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发布时间：2022-10-20 - 摘要：According to the theories of differential geometry and gear meshing,the basic equations for involute helicoids,meshinglines and meshing boundary lines are deduced.Then using MATLAB program,the contact lines and meshing boundary are drawn.The results show that,under the condition of given the parameters of gear workpiece,the distribution of contact lines and meshing boundary lines are influenced by stagger angle and center distance,the actual contact lines are influenced by work half-angle.On the premise of meeting the strength requirements,giving the center distance called modified gear drive and choosing the reasonable stagger angle and half-angle,the honing full gear without axial feed and the well-distributed and uncrossed contact lines can be realized.The problem is solved that in order to realize full gear honing,the axial feed must be adopted with small helical angle and larger center distance must be adopted with large helical angle.
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发布时间：2022-10-20 - 摘要：As the national policy encourage to reduce the fuel consumption and oil prices rising gradually,to reduce fuel consumption of the vehicle is widely concerned.The fuel consumption is closely related to the transmission efficiency,and the rear axle plays an important role in auto transmission system and different lubricant has a great influence on the transmission efficiency of rear axle,the viscosity of the lubricant,the losses of gear meshing and churning losses are analyzed,a lot of experiments are conducted to investigate the influence of viscosity of lubricant on transmission efficiency of rear axle.It is found that relatively low viscosity lubricant contributes to improving the transmission efficiency of rear axle and makes an important significance on reducing vehicle fuel consumption.
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发布时间：2022-10-20 - 摘要：In order to solve the problems of traditional automobile axle housing design and analysis of wide object space distribution,difficult collaborative design and poor interaction performance,a multiple analytic encoded method based on discrete wavelet transform algorithm to the compress axle housing data is used,and then a shared network drive collaborative hybrid system architecture to share and protect the axle housing analyze compressed data is created,a finite element analysis system of network drive cooperative automobile axle housing is combined with JSP.Servlet technology with secondary development of finite element and the numerical computing systems is built.Taking the Dongfeng hercules series axle dump truck as the research object,the model strength,deformation and life characteristics are studied.The results show that the finite element method and technical route based on network collaborative design theory has certain feasibility,which can overcome wide distribution,difficult collaborative design and interaction and poor performance,and the product into production efficiency can be improved and the production cost can be reduced.
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发布时间：2022-10-20 -
Dynamics Analysis of the Asynchronous Starting of Converter Tilting Mechanism Reducer based on ADAMS
摘要：In the process of production of a steel plant of 210 tconverter tilting mechanism,there is a fracture failure of the high speed shafts of reducer.Through the test finding that one of the motors start 0.2slater than others.Aiming at this out-sync phenomenon,the geometry entity model of the reducer which is set up in Pro/E is imported into the software ADAMS.In ADAMS,the dynamics analysis of the model is carried out in the case that the four motors are not starting out of step.The results,a conclusion can be drawn that there is a huge impact between the large gear and a gear shaft of reducer,and uneven loads between four gear shafts.- 3
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发布时间：2022-10-20 - 摘要：In order to improve the service life of the silent chain,a new silent chain assembly method is proposed.The chain plate of clearance fit at the ends of pin and pad of interference fit are changed to outer chain plate of interference fit where the joint is locked with the circlip to improve the chain ability to withstand lateral impact.The extrusion force test is conducted on outer chain plate of interference fit and pad of interference fit,the test result shows that extrusion force of outer chain plate is 4.52 times that of pad.The shear force failure test is conducted on joint lock piece and the test result shows that the failed shear force of the s circlip is 3.87 times that of the 2×12cotter pin.The qualitative test of ten thousand kilometers of off-road vehicle shows that the silent chain installed with traditional method has to be repaired or replaced for every seven hundred kilometers while the silent chain with new assembly method does not fail due to falling off of the chain plate or extrusion of the joint.These two experimental results both prove the reasonableness of new assembly method for silent chain and effectiveness to withstand lateral impact.
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发布时间：2022-10-20 - 摘要：The characteristics,design principles and matters need attention in the design of the high-speed gearbox used in the integral type single cantilever centrifugal compressor are mainly introduced,and this design method is successfully applied to the new product.A good effect of the gearbox reliability and improving design efficiency is obtained.
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发布时间：2022-10-20 - 摘要：For the nonlinear vibration signals caused by vehicle gearbox,a state recognition method combined of multi-fractal and support vector machine is proposed.The vibration signal characteristics are described by using the singular spectrum and generalized dimension which as the input into characteristics of SVM.The intelligent optimization selected of penalty function c and radial basis functionσis realized are through introducing the improved chaotic particle swarm optimization algorithm into support vector machine parameter optimization.The results show that the different operational status of the vehicle gearbox can be classified by using SVM classification model established by this method,and the accuracy is increased.
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发布时间：2022-10-20 - 摘要：Aiming at the major difficulties of OMA method based on vibration signals such as low noise-robust ability,high subjective experience and poor accuracy in identifying parameters and more complex recognition method,a new method of OMA on the basis of QICA is studied.Through the LMS modal experimental data algorithm analysis,the QICA modal parameter identification technology operates simply,and can effectively eliminate noise interference.Finally,regards taking of gearbox modal frequency of the five kinds of working condition recognized by the QICA as characteristic parameter of fault diagnosis,the changes of any kind of model frequency on gearbox fault working condition are compared and analyzed,and the goal of the fault identification is achieved.
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发布时间：2022-10-20 - 摘要：The milling chatter is a form of self-excited,unstable vibration in the process of machining,which may result in low machining quality,poor accuracy and surface finish,as well as accelerated tool wear,aside from damaging the cutting spindle and machined part.A semi-discretization method for predicting the stability of milling process with multiple time delays to study cutting chatter is presented.Taking the unequal pitch milling as example,the comparison between this method and the existing zero order analysis method is carried out,through the theoretical verification,the proposed method with variable pitch cutter in the spindle between 8 000 to 9 000r/min will obtain greater stability prediction limit,while in other revolution range,two predictive results are in good congruency.
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发布时间：2022-10-20 - 摘要：The performance indexes of parameter matching are formulated and the concept of degree of hybridization is put forward based on a kind of driving system of hybrid electric vehicle,the effect of vehicle mass on vehicle performance is obtained by the calculation and analysis of the total power of power source and performance indexes.On this basis,the upper limit and lower limit of the degree of hybridization are calculated,on the basis of ADVISOR simulation platform,the simulation model based on NEDC cycle is built up,the simulation and analysis of the effect between different degree hybridization on the dynamic performance and fuel economy performance of the vehicle are accomplished.The results show that the fuel economy gets better and better along with the degree of hybridization increasing,but the dynamic performance of the vehicle gets worse gradually.According to the relationship between the fuel consumption of the vehicle and the degree of hybridization,the optimum degree of hybridization is confirmed by using twice linear fitting method,besides,the relevant parameter matching of the transmission is accomplished.
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发布时间：2022-10-20 - 摘要：The analysis of advantages and disadvantages of the design and structure of foreign E3 KFC gear reducer is carried out,the improvements design from the box body structure,input bevel gear shaft and bevel gear structure at both ends of the bearing strength other aspects are carried out.
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发布时间：2022-10-20 - 摘要：<正>杭州娃哈哈科技有限公司继承了二十多年来娃哈哈在饮料机械装备开发、技术改造、系统集成应用方面的深厚经验,进入智能装备研发制造领域,在研究机器人系统集成应用的同时,从事工业机器人,特别是专用机器人本体的研究和制造。科技公司致力于高端机电装备的开发与产业拓展,重点开发与制造高端节能电机、伺服驱动器、工业机器人等产品,提供完整的系统集成应用方
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发布时间：2022-10-20 - 摘要：<正>浙江浦江齿轮有限公司是浙江齿轮厂改制组建的。经过了近四十余年的持续发展,形成了较为完善的产品开发、生产、经营、质量管理体系,拥有先进的齿形加工、热处理、锻造等工艺装备及完备的齿形检测手段,专业加工生产5级精度以下、12个模数以内的各类齿轮,年加工生产能力600万件。
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发布时间：2022-10-20 - 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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发布时间：2022-10-20 - 摘要：<正>荆州市巨鲸传动机械有限公司,位于历史名城荆州,是国家最早定点的专业减速机生产厂家之一,至今已有半个多世纪的减速机制造经历。公司现有员工700多人,其中工程技术人员200余人,厂区面积20万平方米,建筑面积7万平方米,拥有立式加工中心、数控铣镗床等各种高、精、尖设备500台（套）,其中精加工全部由数控设备完成。有配备齐全的热处理设备。公司主要生产渐开线行星齿轮减速机,尤善针对用户的需求提供个性化齿轮传动方案。"巨鲸"牌减速机多次获得
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发布时间：2022-10-20 - 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。公司主要产品为风电齿轮箱、轨道齿轮箱和各种非标工业齿轮箱。非标工业齿轮箱主要应用于
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发布时间：2022-10-20 - 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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发布时间：2022-10-20 - 摘要：<正>国内专业的减速器检验机构2010年由江苏省质量技术监督局批准成立的第三方检验机构,具备法定检验资质。资质范围涵盖齿轮减速器、行星齿轮减速器、蜗轮蜗杆减速器、摆线针轮减速机器、谐波减速器以及其他类型减速器的整机综合性能、齿轮精度、金属材质等诸多项目。
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发布时间：2022-10-20 - 摘要：<正>郑州机械研究所开发的系列齿轮CAD软件产品是齿轮设计者必备的设计工具,这些软件具有实用性强、可靠性高、操作简单、使用方便的特点,可用于齿轮新产品设计、系列产品设计、老产品改进设计及测绘仿造设计、项目投标设计等,目前该集成系统已在机械、冶金、石化、煤矿、汽车、风电核电火电、大型装备等行业600多家企业中使用,同时还销往台湾地区。
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发布时间：2022-10-20 - 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七〇三研究所控股子公司,黑龙江省高新技术企业,公司以七〇三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,研发模式已由传统的经验模式转变为更加严谨的理论一试验相结合模式,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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发布时间：2022-10-20 - 摘要：<正>白鸽磨料磨具有限公司隶属于中国机械工业集团有限公司,始建于1956年,是国家"一五"期间156个重点建设项目之一。公司自创建以来,不断创新,把握国际先进水平,"白鸽"牌产品不仅畅销全国,并远销世界70多个国家和地区。公司主要产品为固结磨具、涂附磨具、金刚石滚轮及超硬材料制品等。金刚石修整滚轮是用于精密成型磨削的专用机床加工用砂轮的修整工具,具有修整精度高,几何尺寸不易变化,高效率、高寿命、低成本的优势。其工作原理是:通
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发布时间：2022-10-20 - 摘要：<正>南车戚墅堰机车车辆工艺研究所有限公司（以下简称"中国南车戚墅堰所"）始建于1959年,是中国南车旗下全资子公司,是我国轨道交通装备材料及制造工艺的专业研究机构,江苏省高新技术企业。中国南车戚墅堰所占地近80万平方米,配备各型先进设备2000余台套,目前已形成了轨道交通装备关键零部件、齿轮传动系统、工程机械、汽车零部
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发布时间：2022-10-20 - 摘要：<正>塞特精密江阴塞特精密工具有限公司,系江阴市工具厂转型企业,专业从事精密、复杂刀具的设计与制造。公司拥有40多年的历史,持续致力于人才培养、产品研发技术发展与设备更新,已稳步成长为国内精密刀具行业综台实力最强的企业之一,是国内外众多大型企业指定刀具合伙伴。塞特精密秉承40
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发布时间：2022-10-20 - 摘要：<正>太原理工大学齿轮研究所始建于1960年,是国内最早、持续最久的齿轮专业研究所,参与了多项国家标准的制定以及齿轮手册的编写工作。全国齿轮标准化技术委员会委员单位全国减速器标准化技术委员会委员单位山西省机械工程学会机械传动委员会理事长单位利用现代分析和仿真技术对工业齿轮和车辆齿轮开展理论与应用研究,在渐开线齿轮、渐开线细高齿、圆弧圆柱齿轮、双圆弧弧齿锥齿轮、行星齿轮等减速器、变速器、风电增速器传动形式与动力学特性方面的研究具有深厚的基础。
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发布时间：2022-10-20 - 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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发布时间：2022-10-20 - 摘要：<正>实验室简介:精密驱动与传动福建省高校重点实验室依托厦门理工学院机械与汽车工程学院,于2014年5月经福建省教育厅批准建立。实验室学术委员会主任委员为教育部长江学者特聘教授、北京工业大学石照耀教授,实验室主任为厦门理工学院罗善明教授。实验室以精密驱动与传动领域的新理论、新技术及新装置为研究重点,着力解决工程装备及车辆驱动与传动系统的关键科技问题。实验室现有研究人员35人,其中教授7人,具有博士学位的
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发布时间：2022-10-20 - 摘要：<正>机械传动国家重点实验室于1988年由原国家计委批准建设,1991年通过国家验收并正式对外开放,是机械传动领域唯一一个国家重点实验室,也是国家最早建立的重点实验室之一。实验室针对机械传动及其相关领域的科学前沿、国民经济建设、社会发展和国家安全的重大需求,开展高水平的科学研究、高层次的人才培养和广泛深入的国际合作与交
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发布时间：2022-10-20 - 摘要：<正>西北工业大学"陕西省机电传动与控制工程实验室"于2012年6月经陕西省发改委批准建设。实验室主任由西北工业大学刘更教授担任,学术委员会主任由中国工程院院士,中国商用发动机公司总设计师尹泽勇教授担任。实验室以机电传动设计与控制技术为核心,以先进传动技术、机电液系统集成设计与控制技术和创新设计理论与仿真技术三个方面为主要研究方向,以构建复杂机电传
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发布时间：2022-10-20 - 摘要：<正>制造装备机构设计与控制重庆市重点实验室概况:重庆工商大学"制造装备机构设计与控制重庆市重点实验室"（以下简称重点实验室）是从事制造装备机构设计与控制领域的基础研究和应用基础研究的科研机构。实验室隶属于重庆市科委,依托重庆工商大学建设和运行。现有实验室面积2400平方米,实验仪器设备累计投入1200余万元,拥有ADAMS、ANSYS、UG8.0、CATIA、PRO-E等大型正版商用分析和设计软件（总值163万）,拥有研究人员33人,其中高级职称以上科
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发布时间：2022-10-20
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