最新刊期
期 8 ， 2020
- 摘要：Combining the development of internal and overseas belt drives industry， the time sequence of the evolution of the driving belt is sorted out， it mainly includes flat belt drives， V-belt drives， V-ribbed belt drives， synchronous belt drives and composite type belt drives. The academic research and technical standardization work in the field of belt drives in China are comprehensively introduced， the development trend of belt drives industry is analyzed， and the development direction of the industry is given.关键词：Belt drive
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发布时间：2022-11-10 - 摘要：Based on the multi-body dynamics software RecurDyn, combined with the layout design parameters of a gasoline engine timing belt drive system, the multi-body dynamics simulation model of the timing belt drive system is established. Through theoretical and simulation calculation, the causes of static contact force error between pulley and timing belt are analyzed, the variation law of tension and transmission error of timing belt is studied, and the response characteristics of meshing frequency and excitation frequency are analyzed through frequency domain analysis. The results show that the multi-body dynamics simulation technology based on RecurDyn can provide an effective and reliable research method for the dynamic characteristics analysis and performance evaluation of timing belt drive system.关键词：Timing belt drive system
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发布时间：2022-11-10 - 摘要：In view of the problem of the GB/T 10414-2017 Synchronous belt drive car synchronous belt pulley standard does not provide the RU type and YU type pulley standard tool tooth profile parameter, the conjugate harmonic relationship between the pulley and tool tooth profile are studied. Firstly, the conjugate tool tooth surface of the pulley tooth profile is enveloped based on the meshing principle, and the discrete data of the envelope curve is mathematically fitted to determine the mathematical model of the cutter tooth profile. Secondly, through the second enveloping process of the cutter on the pulley, it is found that there is an undercut at the top of the tooth profile of the processed pulley tooth profile. Through the study of the mechanism of undercutting, the reason of singularity of cutter surface is revealed, and tooth profile model to eliminate the singular point of cutter tooth profile curve is proposed. The tooth profile error based on pulley is within the standard tolerance range, the cutter parameter is redesigned.关键词：RU type and YU type synchronous pulley
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发布时间：2022-11-10 - 摘要：Aiming at the influence of the tooth profile of the synchronous pulley on the bearing capacity of the pulley， a design method of a high-torque bionic tooth profile synchronous pulley is proposed. A simplified tangent curve is obtained from the bionic connection of the stretched triangle pattern of the trunk and the ground， which is used as the tooth profile of the bionic synchronous pulley， and a parameterized method for describing the tooth profile of the synchronous pulley is designed. The tangent curve is optimized by using the finite element embedded optimization module， and finally the parameters of the tangent curve with the minimum uniform stress of the teeth are obtained. The uniform stress distribution of the tooth roots of the bionic synchronous pulley and the conventional arc synchronous pulley is compared. The research shows that the proposed method can significantly reduce the uniform distribution stress of the synchronous pulley and reduce the root stress concentration. Compared with the arc toothed synchronous belt pulley， the bionic toothed profile belt has a more reasonable load distribution and higher bearing capacity.关键词：Synchronous pulley;Bionic tooth profile;Tooth profile optimization;Tooth root stress
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发布时间：2022-11-10 -
Influence of Tooth Profile of Double Helical Synchronous Belt on Drive Performance based on RecurDyn
摘要：Based on the multi-body dynamics software RecurDyn, a virtual prototype model of new type， RU type and ZA type double helical synchronous belt drive is established, and rigid-flexible coupling motion modeling and dynamic simulation are carried out. Under the same conditions, for the three tooth profiles double helical synchronous belts, the stress distribution cloud diagram of the belt strong layer and the tooth and the stress distribution law of the special point of the tooth root are studied in the fully meshed area, and the study of the stress variation law of special points in the belt movement cycle. In terms of belt drive performance, the law of lateral vibration and tension fluctuation of the belt and the law of angular velocity change of the driven pulley are studied. The results show that the tooth root stress of the double helical synchronous belt is smaller, the bearing capacity is the strongest, and the amplitude of the lateral vibration, tension fluctuation and driven pulley speed fluctuation of the belt is the lowest. It shows that the tooth profile of the double helical synchronous belt and the pulley has good meshing drive performance and smooth movement, and high drive accuracy.关键词：New type double helical synchronous belt- 5
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发布时间：2022-11-10 - 摘要：The drive noise of synchronous belt can be divided into meshing impact noise， transverse vibration noise， air flow noise and friction noise. In order to study the frequency distribution characteristics of automobile synchronous belt noise signal， firstly， the frequency domain distribution of various noises of synchronous belt drive is analyzed theoretically. Then， the variable speed and variable tension test is carried out for ZA type automobile synchronous belt. Finally， based on the analysis method of wavelet decomposition， the frequency distribution characteristics of the drive noise signal are obtained. The results show that with the increase of rotating speed， the meshing impact noise increases， and the proportion of meshing impact noise energy in the noise source of synchronous belt drive increases. The meshing impact noise is mainly concentrated in the low frequency band， and the transverse vibration noise is mainly concentrated in the high frequency band. It provides basis for vibration and noise reduction of automobile engine.关键词：ZA type automobile synchronous belt
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发布时间：2022-11-10 - 摘要：The vehicle group chain conveyor is new developed continuous conveying equipment for bulk materials. Compared with existing general belt conveyors, its load-bearing component-the conveyor belt has less tension when the entire machine is running. Based on elastic catenary theory, the tension change rule of the new type vehicle group chain conveyor belt is studied, a theoretical model of the belt tension change in the form of analysis is established, and deduces from it, the belt tension during the operation of the chain conveyor is obtained at last. The expression also proves the correctness of the catenary theory applied to this occasion.关键词：Vehicle group chain conveyor;General belt conveyor;Elastic catenary theory;Conveyor belt tension
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发布时间：2022-11-10 - 摘要：A new structure of chuck-type adjustable radius pulley continuously variable transmission (CVT) is proposed. The new CVT uses the belt drive mode of the combination of the chuck-type adjustable radius pulley and the multi-wedge belt in the drive, and the face contact friction drive between the pulley and the drive belt is realized. The calculation formula of the effective circumferential force of the chuck-type adjustable radius pulley drive is deduced, and the variation law of the maximum effective circumferential force of the chuck-type adjustable radius pulley is analyzed, which verifies the drive ability of the chuck-type adjustable radius pulley with large torque. In addition, the dynamics simulation based on Adams is carried out, and the experimental device of chuck-type adjustable diameter CVT is developed to test and verify. The results show that the drive speed of the new CVT is stable and meets the requirements of vehicle use.关键词：CVT
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发布时间：2022-11-10 - 摘要：Taking 6PK type V-ribbed belt as the research object. Firstly， the mechanism of V-ribbed belt drive noise is analyzed， based on the method of combination of vibration characteristic analysis and acoustic boundary element analysis， the simulation and prediction model of two pulleys V-ribbed belt drive noise is established. The noise distribution nephogram and amplitude-frequency characteristic curve of V-ribbed belt drive system are obtained. Then， based on the principle of sound array technology， a noise source identification device for V-ribbed belt drive is set up， and the experimentally study of influence of rotating speed on V-ribbed belt drive noise is carried out. The frequency domain curve and noise distribution nephogram of V-ribbed belt drive noise at different rotating speeds are obtained. Finally， the comparison between simulation results and experimental results shows that in the non-resonance zone， the noise amplitude increases with the increase of rotating speed. In the resonance zone， the amplitude of the noise will increase sharply， and the amplitude of the higher order resonance is larger. The experimental results are about 4% higher than that of simulation analysis. The correctness of theoretical analysis and simulation method is verified， which provides a basis for the prediction of noise of automobile V-ribbed belt drive.关键词：Automobile V-ribbed belt
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发布时间：2022-11-10 - 摘要：The differential equation of longitudinal vibration of the belt conveyor with stable conveying speed is established based on Kelvin-Voigt viscoelastic theory. The differential quadrature method is used to discrete the vibration equation and boundary conditions. The eigenvalue equation containing the conveying speed and quality variation function of the longitudinal vibration of the belt conveyor is obtained. The relationship between dimensionless complex frequency of longitudinal vibration and dimensionless conveying speed is analyzed. The results show that the second-third order flutter instability occurs in the case of uniform quality， but the first-second， third-fourth order flutter instability occur in the case of non-uniform quality. This conclusion provides a theoretical basis for the stable operation of belt conveyor.关键词：Belt conveyor
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发布时间：2022-11-10
Belt drive column
- 摘要：The dynamics mechanism of the first-order gearbox and its connected two-span rotor system under load excitation and broken tooth fault is studied. Because of the time-varying meshing stiffness of gears and the unbalance of the rotor system， the coupling mathematical model of the gear rotor system is established based on the rotor dynamics and Lagrange equation， and the simulation model is established in Matlab/Simulink. The fault signals are simulated by numerical simulation， and different load excitation is simulated by signal generator. The dynamics response of the system caused by different load excitation and fault is analyzed by observing its time-frequency diagram. Finally， the time domain diagram of the measured signal is obtained and the frequency spectrum is analyzed through the experiment of gear tooth breaking under different load excitation. Then the rationality of the gear rotor system model is verified， which can provide an important theoretical basis for the fault diagnosis of the gear rotor system.关键词：Modeling of gear rotor system
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发布时间：2022-11-10 - 摘要：Taking the spider cardan shaft-hypoid gear pair-tapered roller bearing-half shaft rear axle of the shaft system as the research object， based on the dynamics analysis software Adams， considering the influence of the intermediate support， the transmission shaft-rear axle system dynamics simulation model is established. The second-order （angular） acceleration amplitude curves of the intermediate support， the inputting position of the rear axle and the end of the half axle at different input speeds are obtained. The peak value position of the second-order （angular） acceleration curve is also determined. By using the bench test study based on order tracking， the experimental results show the natural frequency of the first order torsional vibration of the system is 57 Hz， which is consistent with the modal frequency of the system obtained by simulation analysis， and proves the correctness of the Adams simulation calculation result of the transmission shift-rear axle system. The problem of low accuracy of dynamics simulation in studying the coupling vibration characteristics of the flexible transmission system， especially in obtaining the modal parameters is solved.关键词：Transmission shaft-rear axle system
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发布时间：2022-11-10 - 摘要：In order to study the influence of assembly parallelism error caused by the axis tilt on the tooth root bending deformation， a set of gearbox test platform with adjustable gear axis and a complete strain acquisition and analysis system are designed and test verification is carried out. Based on the allowable deflection of the inner and outer rings of the spherical roller bearing， a finite element model of gear contact with different degrees of axis offset is established， and dynamic simulation analysis is performed to obtain the tooth root strain and stress distribution curve during the meshing process. Through the design of different adjustment methods of different axes， the actual and theoretical values of the angular deviation of the two axes before and after adjustment are compared to verify the feasibility of the adjustment device. Finally， the tooth root strain of different axis parallel error are tested through a strain acquisition system composed of a strain gauge acquisition card， the corresponding strain and stress distribution curve is obtained， and compared with the simulation strain and stress curve， the influence of the axis parallel error on the bending deformation at the dangerous root cross section is obtained.关键词：Axis parallelism error
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发布时间：2022-11-10 - 摘要：The FFT-DBN model based on fast Fourier transform and deep belief network， WT-CNN model based on wavelet transform and deep convolutional neural network and HHT-CNN model based on Hilbert Huang transform and deep convolutional neural network are established respectively. Through the integration of the three depth learning models， the comprehensive evaluation model of gear system fault diagnosis based on depth learning is further constructed. By setting up the vibration test bench of the power closed gear system， the test gear pairs with different failure modes are processed and their vibration acceleration signals are extracted as samples， the fault identification effect of the comprehensive evaluation model based on the depth learning is compared with other models， and the results show that the comprehensive evaluation model based on the depth learning can effectively identify a variety of gear faults. Comparing with other models， the fault recognition accuracy of the comprehensive evaluation model based on deep learning is higher.关键词：Fault diagnosis
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发布时间：2022-11-10 - 摘要：The wet clutch is a key power shift component of the armored vehicle. With the increase of the speed and power density of the integrated transmission system， the engagement characteristics are closely related to the failure problems such as excessive wear of the friction pair， partial burning， and warpage of the steel sheet. For the engagement process of the wet clutch， a multi-mode loading test rig is designed and built. The mechanical inertia， eddy current dynamometer and braking device are used as the load simulation device. The engagement characteristics test of wet clutch for different speeds and control oil pressure are carried out. The corresponding stable sliding friction torque with different sliding speed and control oil pressure is measured when the load end by braking device is fixed. The corresponding dynamic and static friction coefficients are derived， which will help to further obtain the transmission characteristics of the clutch and evaluate for its service performance.关键词：Wet clutch
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发布时间：2022-11-10
Theory·Reserach
- 摘要：The Public Industry platform is a product of the industrial internet platform deeply integrated with the new generation information and communication technology and modern industrial technology. It is an important carrier for the digitalization， networking and intelligence of the manufacturing industry. The industrial APP is the key to the development of the industrial internet platform. The definition and concept of industrial internet platform and industrial APP， the operation mode and development prospect of industrial APP platform are introduced. Based on the SYSWARE.IDE industrial internet platform， the development method and application scenarios of the gear transmission design APP are introduced. Taking the calculation of geometrical dimensions of involute cylindrical gear transmission as an example， the development ideas and processes of industrial APP are expounded. The operation and inspection of the gear APP shows that the developed gear APP can meet the requirements of accurate calculation， fast response and industrial Internet operation.关键词：Public industry
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发布时间：2022-11-10 - 摘要：Production line layout planning is closely related to robot structural parameter. For the intelligent production line of the headstock of a vertical machining center， in order to complete the work requirements of grabbing and flipping the workpiece， and reducing the operating space and structure size of the robot， a structural parameter optimization method for loading and unloading robots is proposed. The working space is a constraint condition， and the optimal section of the main section of the manipulator workspace is the objective function， and the structural parameter optimization model is established. Finally， the Monte Carlo method is used to verify the workspace. The results show that the size of the optimized robot workspace is significantly lower than other design schemes under the requirements of the loading and unloading workspace， which reduces the redundant waste of the workspace and further reduces the workload. The foundation of the design research of loading and unloading robot is laid.关键词：Production line;Structural parameter;Robot;Monte Carlo method
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发布时间：2022-11-10 - 摘要：Elastic coupling can isolate the vibration transmission between the main engine and propulsion shafting. Considering the compact equipment arrangement and limited installation space in underwater vehicle tail， a new rubber coupling is designed and investigated. The calculation model of this coupling is built by using the finite element software Abaqus， and the ultraflexible property of rubber material is represented by the Mooney-Rivlin model. The influence of the number of wedges and the structure of hole on the strength and static parameter of the coupling is analyzed. Comprehensive performance comparison is given between the new rubber coupling and the high quality product with the same torque. The result shows that the coupling meets the structural strength requirements and the performance is superior to the contrast product， meanwhile it has smaller installation space requirement. The result provides a reference basis for realize its engineering application.关键词：Rubber coupling
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发布时间：2022-11-10 - 摘要：In view of the market demand for high-power mine reducer, taking the innovative design of 2 000 kW mine reducer as the research object. The monitoring system and water cooling system of reducer are introduced. The model of the box is reconstructed with 3D design software UG. The strength analysis of its innovative structure is carried out by using finite element analysis software. A reference for the design of domestic high-power reducer in the future is provided.关键词：Mine reducer
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发布时间：2022-11-10 - 摘要：In order to improve the fuel economy of the power diffluence hybrid vehicle，a physical model of the hybrid system and a system control model are established. The PSO （Particle swarm optimization） with optimized initial value is used to optimize the hybrid power system efficiency. The optimal power diffluence control strategy is obtained by simulation and it is transplanted to a bus equipped with the hybrid power system and experimentally verified. The results show that the efficiency optimization algorithm can effectively improve the comprehensive system efficiency of the power system and reduce the fuel consumption of the vehicle.关键词：Hybrid power system
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发布时间：2022-11-10
Design· Calculation
- 摘要：The main failure mode in automobile steering system is the bending fatigue failure of the tooth root of nylon worm gear， based on Hertz contact theory and incremental finite element method based on corotational coordinate method， the worm and worm gear nonlinear transient dynamics model is built in multibody dynamics software RecurDyn， and according to the test requirements of loading conditions， the stress analysis and fatigue life analysis is carried out in the software， the nylon worm gear tooth root in each loading condition of transient stress value can be accurately got， then the nylon worm gear fatigue life in the corresponding time process is studied. Fatigue life analysis of the simulation analysis and experimental show that when the dynamics model and fatigue damage model meet certain accuracy requirements， the RecurDyn can be used to quickly and accurately obtain the fatigue life under dynamic loading， this fatigue performance research method provides a model and theoretical basis for the design and fatigue life analysis of worm and worm gear in the following automobile steering system.关键词：Nylon worm gear
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发布时间：2022-11-10 - 摘要：In order to achieve stable control, the Poincare-mapping function is built by using spatial operator algebra (SOA) and the swing phase and impact phase dynamics equation of the passive walking robot are deduced. At last, the numerical analysis method is used to solve the stable fixed point of the mapping function, and the local stability of the model is analyzed. The result shows that, by using the theory of SOA, the Poincare-mapping function can be established effectively and fast, and avoids the complicated calculation of solving partial derivative in the modeling process by Lagrangian mechanics. At the same time, the analysis of local stability shows that passive walking robot must has stable fixed point for cycle stable walking, otherwise, it will occur period bifurcation.关键词：Passive walking robot
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发布时间：2022-11-10 - 摘要：Based on multi-body dynamics method and Hertz contact theory， the Impact function is applied to define four-point contact of steel ball in slewing bearing and meshing contact action of straight teeth with internal teeth. And the multi-body contact dynamics model of four-point contact ball slewing bearing is established by the utilization of Adams simulation platform. The simulated and theoretical values of the angular velocity， transmission ratio and static load of the slewing bearing are compared and testified， and the influence on the rotational speed and load on the dynamic characteristics of the slewing bearing is analyzed. It follows that under the action of axial load alone， the higher the gear drive speed is， the larger the meshing force is， and the vibration get smaller， however， the four-point contact force between the steel ball and the raceway does not change much. When the rotation speed is constant， the axial load and the overturning moment act separately， the overturning moment has a greater impact on the stability of the slewing bearing.关键词：Multi-body dynamics
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发布时间：2022-11-10 - 摘要：The effect of polishing and grinding process on the vibration and noise of gear is investigated based on comparative experiments. The test objects are one pair of polishing grinding gear and one pair of conventional grinding gear. Before the test, the profile and roughness of the two gear pairs are detected to obtain the micro-profile characteristics of the tooth surface. After that, the gear running test is carried out with the two gear pairs. The vibration and noise data are collected at different speeds, and Matlab is used to process the test data to obtain the frequency spectrum and noise variation trend. Based on the surface morphology of the two gear pairs, the influence of polishing and grinding process on the vibration and noise of the gear is analyzed and discussed. From the frequency spectrum comparison, the vibration acceleration of polished grinding gear is obviously lower than that of conventional grinding gear. According to the comparison of noise results, the noise of polished grinding gear is slightly lower than that of conventional grinding gear at 300~600 r/min. The sound of both gear pairs increased slowly at 700~1 000 r/min. In the range of 1 100~1 400 r/min, the vibration noise of conventional grinding gear increases faster than that of polished grinding gear.关键词：Polish grinding
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发布时间：2022-11-10 - 摘要：To study the elastohydrodynamic lubrication（EHL） characteristic of the roller enveloping hourglass worm drive， the line contact isothermal mathematical model is established based on the research of meshing theory of the roller enveloping hourglass worm drive and the theory of EHL. The elastohydrodynamic lubrication of drive pair is solved by using direct iterative method， the curves of oil film pressure and thickness of this drive pair are obtained. At the same time， the elastohydrodynamic lubrication characteristic of dedendum circle， reference circle and addendum circle of drive pair are analyzed. The influence of orifice coefficient and roller radius to EHL characteristics on this worm drive are analyzed at last. The example analysis results indicated that this transmission has better EHL characteristics， the EHL performance of the drive can be improved by properly increasing orifice coefficient and roller radius.关键词：Roller enveloping;Hourglass worm;Elastohydrodynamic lubrication;Oil film thickness;Oil film pressure
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发布时间：2022-11-10 - 摘要：The principle of a six-legged upright walking robot with dual-motor driven and crank connecting rod mechanism as driving system is analyzed. Firstly， by using the vector analytical method， the corresponding motion mathematical model of the walking leg mechanism is established and analyzed. Secondly， the motion trajectory modeling and simulation analysis of unilateral walking leg mechanism is carried out by using the virtual prototype analysis software Adams. Finally， a physical prototype is built to verify the feasibility and the correctness of the working principle， scheme design and virtual simulation results. The results show that， walking leg mechanism can meet to working requirements of six-legged walking mechanism， design scheme is feasible. The theoretical basis for the next dynamics analysis and optimization design is provided.关键词：Adams
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发布时间：2022-11-10
Test·Analysis
- 摘要：According to the transmission principle and mathematical model of the roller envelope end face meshing worm drive， the conjugate relationship of the roller envelope end face meshing worm is analyzed， and the design scheme of the roller envelope end face meshing worm special processing equipment is proposed， and the special processing equipment is developed and carried out. The worm prototype is trial-produced， and bench test is carried out by using the trial-produced prototype. The results show that the single-stage worm and the worm gear mesh with 5 pairs of teeth， the noise of the end face meshing worm increases with the increase of rotating speed， the noise is between 70 and 93 dB， the transmission efficiency of the end face engagement worm increasing with the load increase and gradually becomes stable， the stable transmission efficiency under different loads is between 40% and 48%. It can provide theoretical basis for the proceeding research of this kind of worm.关键词：Roller envelope
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发布时间：2022-11-10 - 摘要：The torsional vibration frequency response test method of RV reducer under torque excitation is introduced. RV reducer is a closed two-stage drive system， the first stage involute gear drive （input shaft） and the second stage cycloid-pin gear drive （output shaft） are respectively applied with white noise and sweep frequency excitation method， and the excitation and response signals are picked up to obtain the torsional vibration frequency response of RV reducer. The two existing methods for testing the frequency response of torsional vibration are compared and analyzed， the difference in frequency response between the two methods is pointed out， and the difference in natural frequency， damping rate estimation and response distribution is verified by actual torsional vibration experiment of RV reducer. The correctness of the test method is confirmed by the results. The research has certain reference value to the testing technology of torsional vibration frequency response of RV reducer.关键词：Torsional vibration
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发布时间：2022-11-10 - 摘要：Carburizing and quenching heat treatment process is the key to improve the surface quality of mechanical parts. In order to improve the surface quality of the planetary gear made of 16Cr3NiWMoVNbE， after analysis， take the carburizing after high temperature tempering， quenching after cold treatment process， so that the surface hardness of the product reach above 60 HRC after carburizing quenching. In the process of uncontrollable layer depth of secondary superimposed carburizing， the process control method of slope rise and temperature drop is adopted in the temperature stage above Ac3， the depth of carburizing layer is controlled accurately. Finally， the process test is carried out to verify it. Thus， the superimposed carburizing heat treatment process with different carburizing layer depth between the tooth surface of planetary gear and the surface of inner hole is developed. The excellent comprehensive performance of 16Cr3NiWMoVNbE aviation gear material is obtained make full use of.关键词：Aviation gear material
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发布时间：2022-11-10 - 摘要：The processing of traditional small module spiral bevel gears is duplex spread-blade method， on the specialized gear milling machine. The gear and pinion are generated normally by the method of duplex， which has high processing efficiency， but the meshing quality on their surface is controlled in difficulty， which fundamentally limits the improvement of its transmission performance. For the bad contact zone of spiral bevel gears with duplex processing， the gear machining parameters are modified and optimized by using the TCA technology， thus the contact condition and meshing quality of the gear pair are improved. This can not only ensure the production efficiency of common modulus spiral bevel gear which is machined by duplex method， but also improve the meshing quality of the gear pair.关键词：Small module spiral bevel gear
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发布时间：2022-11-10
Development·Application
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