最新刊期
期 3 ， 2015
- 摘要：The key points of structural innovation of a CNC milling machine tool YK2260 Xis introduced.The expressions of the movement of each axis by using modified-roll method for machining hypoid gear are deduced,the coordinates of the setting position,the initial as well as the terminal positions for machining are determined,and its programming procedures is introduced.A cutting experiment is performed on the YK2260 Xfor a kind of hypoid gear used in drive axle for automobile,the result indicates that with the software of modified-roll method installed,applying HFM method,the hypoid pinion would be machined by the 4-axis CNC milling machine tool.The contact area of the machining gear is favorable and satisfies the requirements of design.关键词：Hypoid gear;CNC milling machine tool;Structural innovation;Modified-roll method;Driver software
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发布时间：2022-10-20 - 摘要：The inversion algorithm of pinion machine-tool machining parameter for spiral bevel gear is investigated.The pinion tooth surface equation of spiral bevel gear generated by modified-roll method is deduced,the least squares optimization model of the tooth surface is established in order to obtain predesigned target surface,and it is solved by using the levenberg-marquardt method with trust region strategy,and the generalized inverse matrix method and truncated singular value decomposition method are also used to identify the machine-tool machining parameter separately.A numerical example shows the effects of tooth surface approximation,according to the three algorithms,the sum of squared errors between the identified surface and target surface is followed by 1.472 3×10-3 mm2,8.296 9×10-4 mm2 and 1.499 3×10-5 mm2,the result reveals that the levenberg-marquardt algorithm can greatly improve the accuracy of the tooth surface approximation with respect to the first two methods.This iterative algorithm can be used for tooth surface deviation correction and active modification design of spiral bevel gear.关键词：Spiral bevel gear;Machine-tool adjustment parameter;Tooth surface approximation;Levenberg-Marquardt algorithm
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发布时间：2022-10-20 - 摘要：The residual stress of spiral bevel gear on the tooth surface is produce by the comprehensive effect of various factors of grinding conditions.The mathematical model of the grinding basic parameters of the effects on grinding residual stress,grinding heat and grinding force.Based on the finite element 3D model of single tooth,the finite element simulation and analysis of residual stress of spiral bevel gear grinding,and the test shows this method is feasible.The results show the residual stress present in the spiral bevel gear tooth surface,while the residual tensile stress in the tooth,the grinding residual stress is connected with grinding depth,wheel speed,extended speed and grinding fluid.The reducing of grinding residual stress can effectively prevent grinding cracks.关键词：Spiral bevel gear;Grinding;Residual stress;Finite element analysis;Grinding crack
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发布时间：2022-10-20 - 摘要：According to the loading speed requirements of the 50 tons skip loading by quantitative conveyor,to improve the operation reliability of the transmission chain under overload and at the velocity of 1.2m/s,the combination and optimization of sprocket tooth z,chain pitch pand allowable speed v optimization are solved.A method to predict the chain allowable speed is presented,according to the existing small-pitch chain parameters from GB/T 5269-1985,the theoretical formula and the relationship curves between p&vare determined by MATLAB data fitting model,the large pitch chain allowable speed is solved.The calculation shows that p=200 &z=12meet the requirements of the loading speed and nearly consistent with TSUBAKI’s sample.The results provide a theoretical basis for design and ordering of prototype,also can provide a reference for parameter selection of large chain.关键词：Quantitative conveyor;Chain drive;Allowable velocity;Data prediction
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发布时间：2022-10-20 - 摘要：The cylindrical gear with arcuate tooth trace has advantages of high bearing capacity,high contact strength and steady transmission,etc.But there are also failure modes such as the wear of tooth surface,pitting and scuffing when it drives,it is mainly because of the bad lubricating condition.So ensuring that it is always in good lubricity would be critical.After analyzing the meshing contact process of cylindrical gears with arcuate tooth trace,the contact model of gears is simplified.Based on the elastohydrodynamic lubrication theory,the physical and mathematical model of isothermal elastohydrodynamic lubrication for the cylindrical gear with arcuate tooth trace are established.Through the direct iterative method and Fortran procedure,the numerical solution of the model is solved and the characteristic curves of oil film are got.The influences that entrainment velocity,load and viscidity bring to lubrication characters of the cylindrical gear with arcuate tooth trace are analyzed and compared.The results show the entrainment velocity is the most important cause for the oil film thickness,the viscidity has important influences both on the oil film pressure and thickness,and the load influences less relative to other two factors.Besides,using the oil film thickness ratio,the lubrication state of gears could be estimated,which helps keeping gears approach the elastohydrodynamic lubrication state when designing.关键词：Cylindrical gear with arcuate tooth trace;Line contact;Elastohydrodynamic lubrication;Oil film pressure;Oil film thickness
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发布时间：2022-10-20 - 摘要：The meshing impact caused by backlash has great effect on the stability and reliability of gear transmission.To acquire the impact component from the fault signals of gear system,a feature extraction method based on Gammatone filters is proposed.By using signal processing function of human basilar membrane in the complex speech recognition process for reference,the Gammatone filters is used for time-frequency analysis of fault signals according to their similarity in impulse response and amplitude-frequency,and further to extract the impact feature.Research results show the time-frequency analysis ability of Gammatone filters to the non-stationary transient vibration signals of the gear system and the effective feature extraction ability of the proposed method.
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发布时间：2022-10-20 - 摘要：The multi-mass elastic torsional system has the feature of large speed fluctuation and long vibration time.The system state space model is built based on the system analysis,and the parameters of this model are estimated by using Simulink Parameter Estimation Toolbox.The system speed is controlled by using dynamic matrix control（DMC）algorithm.The DMC controller is converted into embedded C code which is executable for PLC by using Simulink Coder toolbox in Matlab.After being compiled by Automation Studio,it will be downloaded to X20 PLC to control the real system.Both the simulation and practical system test shows that the model is accurate and DMC algorithm is better than cascade PID algorithm in dynamic performance.关键词：Multi-mass elastic torsional system;Dynamic matrix control;MPC toolbox;Simulink-Coder
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发布时间：2022-10-20 - 摘要：According to the recurrence plot analysis to the gear vibration signal,it is found that there are obvious difference between the gear condition and the driver system characteristics represented by recurrence plots.If the recurrence plots are regarded as a binary image,the parameters calculation by recurrence qualification analysis,such as recurrence rate,determinism,laminarity and recurrence time etc can be used to describe the feature of the image.The characteristics of recurrence plots that correspond to dynamical system and image respectively are analyzed.In order to depict the local feature of recurrence plot,the sliding recurrence analysis is proposed.The proposed approach combined with Gaussian mixture model and Bayesian maximum likelihood classifier are used to classify the gear vibration signals which are acquired from gear fault experiment facility.The classification results show that the higher discrimination rate can be achieved by the proposed method.关键词：Recurrence plot;Recurrence quantification analysis;Binary image;Gaussian mixture model;Fault recognition
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发布时间：2022-10-20 - 摘要：The elastohydrodynamic lubrication numerical analysis of water-lubricated Tenmat bearing is carried out by using the Reynolds equation with thermal effect.The effects of load,speed and shaft diameter on the pressure and film thickness of Tenmat bearing water lubrication film are discussed by the numerical simulation.The results show that thermal effect has little effect on the pressure,but the film thickness decrease under the thermal condition.The pressure peak is increased greatly with the increase of load,but the film thickness is decreased.The pressure peak is decreased with the increase of speed,but the film thickness is increased.The influence of shaft diameter on the pressure is not obvious,but the film thickness is decreased with the increase of shaft diameter.关键词：Water lubrication;Tenmat bearing;Thermal elastohydrodynamic lubrication
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发布时间：2022-10-20 - 摘要：In order to solve the current problem of the transmission manipulator design of high manufacturing costs and general easy occasions limitations,a new manipulator based on roller chain drive system is presented,and aiming at the roller chain drive system,through the use of multi-body dynamics theory and Lagrangian methods,the transverse vibration modal characteristics and stability of manipulator system roller chain drive is analyzed and got.The results show that,by comparing the operation characteristics of the large stroke with roller chain drive and non-roller chain drive manipulator system,the proposed model has lower manufacturing costs,and the new manipulator system solutions can better solve the limitations of using traditional manipulator problems are generally easy to use the occasion.The manipulator with roller chain drive and non-roller chain drive in the ideal trajectory operating characteristics of small differences,it is meet the general requirements for operation of the manipulator with using less precision.The chain drive transverse vibration natural frequency increase with the decreasing chain length,the drive speed has less affected on transverse vibration,the chain tension on the chain drive transverse vibration shows that the linear relationship between the natural frequency increases as the tension gradually increases.关键词：Large stroke manipulator;Roller chain;Drive characteristic
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发布时间：2022-10-20 - 摘要：Traditional constant safety factor method and novel slip-control method are extreme different methods of clamping force control strategy for continuously variable transmission（CVT）.To integrate advantages of both methods,clamping force control strategy base on dynamic safety factor is presented.Analysis of the theoretical clamping force relevant parameters and engine torque wave characteristics is carried out.The safety factor is determined according to engine torque variation trend and range.The calculating process of dynamic safety factor method is described.The simulation and experiment results show that,by adopting dynamic safety factor method,the transmission reliability is ensured.The performances of clamping-force and fuel efficiency are improved.Especially,the clamping force reduced about 20%,the economical efficiency increased about 3%.关键词：Continuously variable transmission;Clamping force;Safety factor;Control
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发布时间：2022-10-20 - 摘要：For the problem of generating Pascal curve gear tooth profile,the tooth profile of Pascal curve gear is designed via the conversion method of tooth profile and the non-cricular gear meshing principle,and its three dimensional modal is got by using Pro/E.The problem of dedendum transition curve generation is discussed and the transmission characteristic of a pair of Pascal curve gear are researched.It would be help to further study wire cutting of the Pascal gear on the basis of the involute profile which got by the conversion method of tooth profile.关键词：Non-cricular gear;Conversion method of tooth profile;Pascal curve
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发布时间：2022-10-20 - 摘要：By using the three-dimensional CAD software Pro/E,the three-dimensional geometric model of a certain type of cycloidal gear pumps is established,then the mesh generation of them is carried out by using Hypermesh,and it is simplified and imported into ANSYS software,the finite element model is built.Using the ANSYS software,the modal analysis of cycloidal gear pump is carried out,the modes,natural frequency and mode shapes participation factor of cycloid gear pump are acquired to ensure in the design of cycloid gear pump can avoid resonance model.The results show that the cycloid gear pump design is reasonable,and the results of modal analysis can be provide an important frame of reference for the optimum structural design and the development of new products.关键词：Cycloid gear pump;Pro/E;Hypermesh;ANSYS;Modal analysis
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发布时间：2022-10-20 - 摘要：The tooth surface of worm gear of ZA-type worm gear and worm transmission is spatial conjugate surface of complex worm cylindrical spiral surface,the mathematical equations describing of the worm gear tooth surface is complex,parametric accurate modeling is difficult.According to the principle of worm hob enveloping machining worm tooth surface,collaborative using the PDG,GSD,ASD,DMU SPA,DMU KIN 5functional modules and knowledge tools of CATIAV5 platform,the method of control the affine parameter family of curves to create a leading multi-section composite configuration 3Ddigital modeling used for precise parametric digital modeling of the ZA worm gear is proposed,a controllable parameter modeling processes with the negative feedback control of the contact analysis of the static and dynamic area is constructed,a foundation of accurate parametric 3Ddigital modeling for worm gear and worm transmission CAE advanced analysis is laid.关键词：CATIA;3D;Worm gear and worm;ZA;Accurate;Parameter
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发布时间：2022-10-20 - 摘要：The parametric modeling of spiral bevel gear is of great significance to its further research on tooth contact analysis in its digitized design.From the precision of spiral bevel gear tooth with spherical involute tooth profile,the principle of forming the spherical involute is used to solve the parametric equations of all parts of tooth profile curve.Combining the unique advantages of Frenet frame in the SWEEP surface modeling,a modeling method of tooth surface of spiral bevel gear with the spherical involute is presented based on the SWEEP.Finally,the model is created by using the transverse tooth profiles through the SWEEP method.The numerical example verified that this method can finish fast and accurate parametric modeling process of the spiral bevel gear tooth surface,a new access to design of the spiral bevel gear is provided.关键词：Spherical involute;Frenet;SWEEP;Spiral bevel gear;Modeling
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发布时间：2022-10-20 - 摘要：Focus on the realization of two kinds of function of stabilization and tracking of lowDOF parallel mechanism,by using the screw theory,a 2-SUP（U）parallel mechanism is designed,and the DOF of this mechanism is analyzed.According to the motion characteristic of this parallel mechanism,using vector algorithms with Rodrigues parameters,the kinematics analysis is carried out,and the calculation method of position inverse and velocity inverse is deduced respectively.Moreover,the simulation is carried out with the Matlab,the position,velocity and other characteristics curve are obtained.The theory foundation for the control of position and velocity of this mechanism is provided.关键词：Parallel mechanism;Screw theory;Kinematics analysis
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发布时间：2022-10-20 - 摘要：Aiming at the problems of the current CVT actuated by hydraulic control system,such as high energy consumption,complicated control systems,speed ratio and transmission ability being limited by metal belt axial deflection,a new designed cam pressurized CVT hydraulic system is proposed,which is composed of cam automatic pressurized device and closed hydraulic system.The cam pressurized device automatically provides most of the clamping force,the closed hydraulic control system provides the auxiliary clamping force and changes the speed ratio.The new designed hydraulic control system with simple-structure can leave out expensive reversing values and reduce overflow loss,therefore it has advantages of less component parts,energy conservation,environmental protection and low cost.The structure design and working principle of the CVT system are introduced,and the simulation analysis is carried out by using the Matlab/Simulink software.The simulation results show that the cam pressurized CVT hydraulic control system has the significant advantages of fast dynamic response,stable performance and so on.关键词：CVT;Cam pressurized;Simulation analysis;Dynamic characteristic
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发布时间：2022-10-20 - 摘要：In order to solve the problems of the design and performance analysis interoperability,adjustability,the BWD mode and ASP dynamic web publishing technology integration are carried out,taking the multiple layered belt drive as the study object,using MATLAB secondary development,the multiple layered belt drive design and performance analysis systems is built,this system has a parameter matching,performance calculation and analysis module.The results show that intelligent design and analysis system design methodology based on WEB technology has certainly feasibility,the method can simplify the belt drive design process and performance characteristics research,improve the design efficiency.关键词：Belt drive;WEB theory;Design;Analysis
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发布时间：2022-10-20 - 摘要：According to the principle of space meshing,the equation derivation process of the tooth line on the cones of spiral bevel gear is introduced,and the tooth line equation of the expression with different cone angles is achieved.By using the Pro/E parametric modeling software,the 3Dsolid model models of a pair of spiral bevel gear in a certain type of vehicle transmission system is built,and the assembly,interfere check in the process of the dynamic mesh are carried out.Through the analysis of interference zone,the method of adjusting the gear tangential modification coefficient is proposed,and the assembly model of spiral bevel gear meshing pair is obtained,the advantageous condition for the finite element analysis of further is provided.关键词：Spiral bevel gears;Pro/E;Modeling;Simulation
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发布时间：2022-10-20 - 摘要：Firstly,comparative study for the spiral bevel gear dynamic character is carried out by taking pressure angle,blade tip radius and ratio of gear tooth thickness these parameters into consideration and based on the modeling of mult-body and mult-DOF dynamics equation and theory of mixed elastohydrodynamic lubrication（EHL）time-vary friction.Considering the influence of non-linear parameters,such as time-vary friction force,dynamic mesh force and transmission error and backlash,at the same time take into account in practical application,the gear meshing in a mixed elastohydrodynamic lubrication（EHL）consisted of asperity contact and full film lubrication.The dynamic response of system is solved,the result shows that it has better performance of dynamic response and dynamic transmission error after the optimization of design parameters.Last,through the bench test,the accuracy of the research result is verified.
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发布时间：2022-10-20 - 摘要：According to the demand of clamping the medicine box proposed by the medicine factory,a new design scheme of underactuated manipulator is presented.The pneumatic drive is used in this design scheme of the manipulator,and using the theory of variable degree of freedom and dead center of mechanism,the actions of reliable clamping and lifting to medicine box are realized by using single power source.On this basis,through the structure analysis and calculation of its force,the function of manipulator is analyzed and the theoretical results are actually verified by entity model.The analysis of the manipulator shows that stability performance,large force clamping and the convenience of operation reached the the design requirements.关键词：Manipulator;Underactuated;Dead center of mechanism;Principle of virtual work
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发布时间：2022-10-20 - 摘要：A new type of automatic stair climbing wheelchair can helps the disabled walking up and down the stairs and the ground is designed.By adopting the leg structure and using the mechanical foot and wheel bearing alternately in the up and down the stairs equipment,the process of up and down the stairs is simulated.The fine-tune mechanism which can be used to adjust seat angle,keep the seats level all the time is set.The change of the gravity center in the process of up and down the stairs is analyzed,the results show that the design of wheelchair is reasonable,a disabled people can use it up and down the stairs instead of walking.关键词：Stair climbing wheelchair;Electric;Shift;Gravity center analysis;Planar linkage mechanism
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发布时间：2022-10-20 - 摘要：Focusing on the fault and the maintain of the tower structure in the high voltage transmission lines,the high voltage tower climbing robot is designed,the robot carries many sensors and two cameras in the front and the end,thus,the robot could achieve to grab different types of angle iron in multi-angle.The model is established by using Solidworks,and the kinematics analysis and simulation of the tower climbing robot is established in the Solidworks.Because of the climbing and grab structure of the robot is important,the statics analysis of the key position are carried out in the ANSYS Workbench.关键词：Robots;Climbing robots;High voltage transmission line towers inspection
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发布时间：2022-10-20 - 摘要：In order to reduce the pulsation of output angler velocity of the non-coaxial style of two-output impulse generating mechanism,by using rigid body dynamics software ADAMS for parametric modeling,and combining the MATLAB for data analysis,the variation law of the double output rod angular speed and acceleration and the institutional average,pulsation coefficient and abrupt change of angular acceleration with crank length change are obtained.Through the simulation analysis of example,the consistency of output motion and the crank speed adjustability are verified,and the variation law of the mechanism pulsation will be decrease with the increase of crank length.Finally,the impact of long-rod OE and EF change on the double output motion law of mechanism is analyzed,it is shows that,after increasing the length of the rod OE and EF,the mechanism pulsation decreased,a theoretical basis of the dimension synthesis and optimization of the impulse generating mechanism is provided.
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发布时间：2022-10-20 - 摘要：The dynamics equation of the four gears parallel drive system of shield machine cutter is established.The 3D model of the four gears parallel drive system is established by using the UG software.The dynamic process of the four gears parallel drive system is simulated by using the ADAMS software.Then the influence of meshing damping,meshing stiffness,backlash and distribution of driving gear on the load sharing are also analyzed.The research shows that the larger the difference between meshing stiffness and meshing damping is,the more uneven the load sharing is,when the driving load changes,backlash has a larger effect on the load balance,the different distributions of driving gear have rather a great impact on the stability of driven system.The results can provide theoretical basis for the design and manufacture of the four gears parallel drive system.关键词：Shield machine;Multiple gears parallel drive;Load sharing;Ggear dynamics
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发布时间：2022-10-20 - 摘要：Aiming at the high speed requirement of industrial flat sewing machine,The kinematics and dynamics models of the thread take-up and needle bar mechanisms are established by using the closed-loop vector method and the simultaneous constraint method,and its kinematics and dynamics equations are deduced.Applying the Simulink module built in the Matlab,the simulink model of the mechanism is built and executed.By analyzing the inertia force and the force in kinematic pair on the mechanism,the conclusion that there is a periodic force which liked an impact force acting on each kinematic pair is obtained.And the periodic forces would cause the rack vibration as well as the abrasion of the kinematic pairs.The analysis for the thread take-up and needle bar mechanism based on the dynamic static analysis method lays a foundation for the further improvement of sewing machine.关键词：Flat sewing machine;Thread take-up and needle bar mechanism;Dynamics analysis;Matlab/simulink
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发布时间：2022-10-20 - 摘要：Aiming at the characteristic of hybrid vehicle powertrain system,a new control strategy of regenerative braking is put forward based on the classification of braking intensity,in developing the simulation model,many vital factors,such as the initial temperature of battery system,the transfer efficiency of motor and the driving torque of engine are taken into consideration,and the experimental data of this specific car are put into MATLAB.The simulation result shows that what proposed control strategy can achieve high performance of energy recycle with the limitation of ECE rules,when a soft or moderate braking intensity is needed.关键词：Hybrid vehicle powertrain system;Energy recycle;Regenerative braking
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发布时间：2022-10-20 - 摘要：Through the experiment of the vibration modal of gearbox shell,the gearbox shell vibration state is analyzed and the stability of its operation is evaluated.By using DASP（Data Acquisition& Signal Processing）software,the vibration modal of the HW25505 TCL type aluminum alloy gearbox shell is tested.By the contrast between ERA method and PloyLSCF method,the reliable 14order of frequency and damping are obtained,and thus the vibration mode analysis is carried out.By using modal correlation matrix of modal to test and verify,through the comparison with calculating modal,the validity and reliability are proved.Applied DASP to vibration modal test of gearbox shell,not only the gearbox shell high order frequency,damping,vibration mode,and vibration condition can be acquired,but also the vibration problem of similar shell gearbox in operation can be solved,The theoritical basis for the improvement of the gearbox shell structure characteristics and the fault diagnosis of gearbox shell are provided,and had better promotion value in engineering practice.关键词：Gearbox shell;Modal experiment;DASP software;Modal analysis
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发布时间：2022-10-20 - 摘要：To the problems of strong nonlinear,time delay and lower control accuracy of wet clutch actuator,an automobile automatic transmission with wet clutch actuator is studied,according to the characteristics of the wet clutch and control strategy requirement,a wet clutch electro-hydraulic actuator control model is established,the simulation is carried out with Matlab/Simulink software.The results show that the charge phase,the displacement of electric hydraulic valve plunger and clutch,the clutch flow to achieve maximum positive displacement first,and gradually decreases stabilized.In the discharge phase,the displacement of electric hydraulic valve plunger and clutch,the clutch flow to achieve maximum negative displacement first,and gradually increased to stabilize,and the overall trend is consistent with the input current.In different times have different average delay time,and the delay time will reduce the control precision control of systems.The different control accuracy generate in different controllers and predictive control policies.关键词：Wet clutch;Actuator;Electro-hydraulic control;Simulation
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发布时间：2022-10-20 - 摘要：The driving roller in dredger grab machine has the characteristic of limited installation space and complicated load condition,is an effective supporting connector which ensures the machine works safely.According to the virtual prototype of dredger built on simplified model of mooring system,the virtual experiment model of driving roller is constructed between pedestals and workbench of grab machine.And according to the restriction of adding contact of the forces applied on the roller during the motion process of the grab machine,the statics analysis and dynamics analysis are carried out based on ADAMS software.The force curve of driving roller is fitted into subsection function and the finite element model is constructed in ANSYS,so that the stress distribution and the displacement deformation can be analyzed in time domain.The analysis results show that virtual experiment of driving roller in dredger grab machine effectively finds out the failure condition of roller during the working process of grab machine,and a reliable simulation model to its structure optimization as well as mechanical structure analysis on the offshore work platform is provided.关键词：Roller;Virtual experiment;Dynamics analysis;Finite element analysis
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发布时间：2022-10-20 - 摘要：The water-cooled gearbox is the key component of bell-less blast furnace top.Its function is to drive and control the rotation and tilt of the material distribution chute to meet the requirements of different material distribution.BY using the virtual prototype technology,taking the water-cooled gearbox of blast furnace as research object and the research of its dynamics simulation is carried out.The simulation results show,either in high or low speed rotation,the meshing force of the outer ring gear is comparatively small.Contrarily,when in tilt,the meshing force of the outer ring gear is comparatively large,the maximum meshing force is nearly 2times of the former,it is show that the distributing device is not very stable when the chute tilting.关键词：Blast furnace;Water-cooled gearbox;Virtual prototype;Mechanics simulation
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发布时间：2022-10-20 - 摘要：In order to study the torsional vibration of gear transmission system under slippage in high-speed train.A parametric vibration model of the gear transmission system is developed when the time-varying stiffness and the transmission error are considered.The nonlinear characteristic of selfexcited torsional vibration caused by wheel-rail creepage is analyzed.Numerical simulation results show that the time-varying mesh stiffness of meshing teeth pairs is the main cause of harmonic vibration of gear transmission system,when the wheel-rail creepage is over the best value,the self-excited vibration occurred and gear transmission system have the phenomenon of limited cycle in the same time,the self-excited vibration has no effect on the change of main frequency of the gear transmission system,but the harmonic response become more obvious,cause a strong vibration on the gear transmission system.关键词：Gear transmission system;Parametric vibration;Self-excited vibration;Creepage
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发布时间：2022-10-20 - 摘要：Aiming at the study the vibration response frequency and its displacement of small-caliber vehicular gun tube,the simplified model of elevating mechanism including gear backlash is established and the method of parameter identification of contact-impact mechanical model is given.Through the dynamics simulation by applying sinusoidal signal in ADAMS,the vibration response frequency of tube with backlash are compared with no backlash,and its displacement and velocity are obtained.The results show that the continuous multi-frequency phenomenon occurred with large range,which has a bad effect on projectile initial conditions and reduces firing accuracy.Based on this,the theoretical guidance in structure optimization of gun control and firing accuracy improvement is provided.关键词：Gear backlash;Small-caliber vehicular gun;Tube;Vibration response;Contact impact
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发布时间：2022-10-20 - 摘要：Aiming at the problems of the process of driving heavy duty truck fuel consumption,higher manufacturing costs and so on,according to the finite element theory,the heavy duty truck driven axle housing lightweight design is carried out,and the light weight calculation results are imported into the finite element model to study the deformation of the axle housing before and after optimization at maximum load optimization uneven roads conditions of stress,life and safety coefficient changes.The results show that after the axle housing thickness lightweight size optimization,wheel area,leaf springs to the axle core area and axle core,the trend of the overall thickness of the axle housing is downward,there is no change to the wheel area to leaf spring transition area thickness.After the axle housing thickness lightweight size optimization,the trend of the total volume is a downward,the volume of the initial value is from 0.043m3 dropped to 0.0343m3,after lightweight size optimization,the axle housing stress and deformation,life and safety factors are little difference with before optimization,it is indicating that meet the requirements of lightweight of axle housing.关键词：Driven axle housing;Finite element;Lightweight;Reliability
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发布时间：2022-10-20 - 摘要：Because of the drives reliably and has a simple structure of chain transmission,it is applied widely in agricultural machinery.For example,the chain bucket filter is applied in recirculating system in aquaculture.The key part of chain bucket filter is sprocket which often works in harsh conditions,complex load or other situation.This circumstance can make the tooth worn and failed to work.To increase the life and reduce the stress concentration of sprocket,by using the platform of Pro/Engineer,a three-dimensional model of the sprocket is built,and the dynamics analysis and structure optimization are carried out by using Pro/E Mechanica,and at the same time to reduce the weight of sprocket,the force of sprocket is distributed well and the concentration of stress and deformation is reduced.The global sensitive analysis of sprocket shows that the increase of the radius of addendum has weakened,the growth of the maximal stress and the maximal stress has decreased with the increase of flange diameter.Finally,an optimal design for two important parameters is carried out based on the minimum quality of sprocket and find optimization within reasonable limitations:When the tooth top arc diameter and flange diameters is 14 mm and 54.953 2mm respectively,the minimum quality of the model is 3.437 6kg and the quality of the model has decreased by 4.48%.关键词：Pro/E Mechanica;Dynamic analysis;Sensitivity analysis;Optimization design
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发布时间：2022-10-20 - 摘要：In order to further the engagement characteristics of marine wet multi-plate clutch for accurate analysis and lay the foundation for the subsequent optimal design of marine clutch.Taking the marine wet clutch as the research object,based on the isothermal design,through the engagement process to determine the optimal pressure and improve the traditional pressure distribution model.Finally,a method for calculating the marine wet multi-plate clutch engagement characteristics is obtained.The results indicate that,based on the optimal pressure conditions required time for wet multi-plate clutch driving,driven disk angular velocity reached the speed is significantly less than the linear pressure,and friction work generated in the period is significantly less than the friction work generated by the linear pressure conditions.The wet type clutch-operating force change obtained by using pressure distribution has differences,and the engagement force of the operation after the correction is less than the conventional model,the engagement with the engagement pressure of the operating force is linear.There was no direct link between the actual and the effective radius of the wet clutch engagement pressure,but find that the new pressure is greater than the traditional model of distribution model in the calculation process.关键词：Wet multi-plate;Marine clutch;Improvement;Engagement characteristic
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- 134
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- 1
发布时间：2022-10-20 - 摘要：Without taking into account of redundant constraints,common constraints and isolated degree of freedom（DOF）,the traditional DOF calculation formulas are inefficient in calculating the DOF of planar mechanism in certain complicated cases.In addition,recalculating is needed when the configuration of mechanisms is changed.To solve these problems,a novel universal formula of DOF for planar mechanisms is presented based on the effectiveness impact of the components on the relation of input and output motion of mechanism.The algebraic relationship between redundant constraints,common constraints,partial DOF and the DOF of mechanism is studied respectively.The valid components,valid loops and higher pairs are defined as formula variables.The new formula does not need to calculate compound hinges and lower pairs and overcomes the invalidity of traditional formulas,which can be used directly for all kinds of planar mechanisms.In addition,by defining valid loops of mechanisms,the new formula emphasizes the impact of components,the basic unit of mechanisms,on the DOF of mechanism,which can avoid recalculating when the configuration of mechanisms is slightly changed.Contrast examples are presented to show the simplicity and validity of the new formula,which can be applied to ad-hoc planar mechanisms that couldn’t be solved by traditional formulas.关键词：DOF calculation;Planar mechanism;Redundant constraint;Common constraint;Partial DOF
- 10
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- 296
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- 1
发布时间：2022-10-20 - 摘要：The NC machining simulation and virtual measurement of spiral bevel gear is carried out based on the VERICUT.Firstly,the coordinate transformation principle of traditional machine and NC machining principle are introduced.Then the tooth cutting simulations of the large gear of spiral bevel gear are carried out by using VERICUT.Secondly,the three-dimensional model is reversely built by means of UG software and the generated coordinates of tooth surface points.Finally,the simulation tooth cutting model is measured and contrasted with UG design model to verify the feasibility of NC processing method.Meanwhile,it also offers shortcuts to the actual NC machining of the gear,and greatly shortens the cycle from design to production,thus improving the production efficiency of spiral bevel gear.关键词：Spiral bevel gear;VERICUT;NC machining simulation;Virtual measurement
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- 270
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- 7
发布时间：2022-10-20 - 摘要：For the problems of measuring methods,based on the measurement status and processing status consistent detection principle,the enveloping worm precision measuring principle is designed.According to the automatic calibration procedure and the high-precision time grating turntable,so that the three-dimensional measurement coordinate system is created automatically by the system,and the probe radius of gyration is measured by using the coordinate rotation method.By using servo control method to measure the enveloping worm tooth surface coordinate values of each measurement point in the coordinate system,and the enveloping worm accuracy is obtained.The pyramidstyle structure is used to makes the system more stable,reliable.The experiments show that the feasibility of the program,and the measured accuracy of enveloping worm helix reached±4μm.Repeating the same precision experiments of system,the range of system reached 0.9μm,the variance analysis shows that the error value of each measurement point is no significant difference.关键词：Helix;Three coordinates;Rotary table of time grating
- 5
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- 89
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- 0
发布时间：2022-10-20 - 摘要：By using epicyclic train to close differential gear train,it makes this kind of gear train with high efficiency,large transmission power,wide transmission and compact structure,etc.The form of gear transmission is adopted in the epicyclic train.A Gear/Chain mixed transmission planetary gear reducer is designed by using gear/chain instead of parts of gear to realize the function of epicyclic train.On the basis of the theoretical calculation method of epicyclic train transmission ratio,the calculation formula of gear train transmission ratio is derived.According to the method of graphic to draw the power flow diagram of gear/chain mixed transmission for planetary gear reducer.The power flow analysis of the transmission system is carried out through these diagrams,and the calculation of the transmission efficiency is carried out.关键词：Epicyclic train;Transmission ratio;Efficiency calculation;Gear/chain
- 4
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- 165
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- 2
发布时间：2022-10-20 - 摘要：Chain drive relying on the sprocket teeth meshing with the chain link to transmit motion and power,it is one of the most important transmission mode in the modern machinery manufacturing industry,and the application of roller chain is most.As the chain drive is a disturbing movement,its assembly relationships and movement characteristic are complex.By using Creo 2.0software and taking single row roller chain as example,the a single chain link modeling,assembly are carried out.Through the guide curve,all the chain links are imported for assembly,and its motion simulation is carried out,a reference for the design of modern mechanical chain drive parametric modeling and motion simulation is provided.关键词：Creo 2.0 Chain drive;Parametric modeling;Motion simulation
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- 291
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- 2
发布时间：2022-10-20 - 摘要：Aiming at the problem of the failure of the first stage mesh gears of the combination reducer of spiral bevel gear and helical cylindrical gear,the test of the torque and vibration signal,and the finite element analysis of parts are carried out.Combining the real example of the gear stripping and breakage,the failure reason and some relevant action are expound.关键词：Spiral bevel gear;Test;Analysis;Action
- 4
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- 69
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- 1
发布时间：2022-10-20 - 摘要：The deeply analysis of the flexible pin shaft component structure of wind power gearbox planet wheel and assembly relationship are carried out,and the variable of the influence factor on the planet flexible pin assembly is confirmed.Through the experiment,the variable data is extracted,the relation curve and the function relationship between the size and temperature rise of the planet wheel pin shaft hole are obtained,the law between the flexible pin shaft sleeve and the three variables of the clearance after normal temperature,preset clearance,combination of instantaneous clearance of locating ring is found.Finally,through the simulation experiment and final assembly results,the assembly technology research scheme of planetary wheel flexible pin component is verified.关键词：Wind power gearbox;Flexible pin;Gear transmission;Shaft of planet wheel
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- 140
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- 3
发布时间：2022-10-20 - 摘要：The rational allocation of gearbox bearing not only affects the internal structure and the service life,but also determines the service life of the bearing itself.Combining with the Xiangtan Iron and steel wire 12 Vgearbox bearing,the site analysis is performed,the improved optimization scheme and implement are proposed,agood effect is obtained.关键词：Bearing arrangement;Failure;Axial force
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- 112
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- 1
发布时间：2022-10-20 - 摘要：The characteristics and performance requirements of electric cylinder are described,and some of the electric cylinder application are listed.The research status of electric cylinder at home and abroad are introduced,and the common structure of electric cylinder at present is expound.Finally,the development trend of electric cylinder is discussed.关键词：Mechanical transmission;Electric cylinder;Structure;Intelligent
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- 1599
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发布时间：2022-10-20
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