最新刊期
期 1 ， 2019
- 摘要：Based on the multi-body dynamics software RecurDyn,a virtual prototyping model of new arc tooth synchronous belt drive is established and simulated. The simulation stress cloud chart shows the synchronous belt bears the maximum load at the pinch-in and out areas of active and driven pulley. Analysis on dynamic virtual prototypes shows that the tooth surfaces are loaded in the pinch-in and pinch-out areas,and belt deflection are the main reasons for the increase of the band load. And the load on the top of the belt tooth can effectively reduce the root load. The polygon effect of the synchronous belt and the internal excitation of the system caused by the meshing impact are the main reasons for the angular velocity fluctuation of the driven wheel. The research of the output speed of the driven wheel shows that the speed fluctuation is a periodic harmonic function.关键词：New arc tooth synchronous belt;Drive accuracy;Drive error;Stress
- 4
- |
- 208
- |
- 6
发布时间：2022-10-20 - 摘要：In order to establish the effect regulation of surface topography characteristic parameters on gear dynamics performance,measurement of fractal dimension for gear surface and its efficiency and vibration are tested in the condition of different lubrication. Based on three sets of gearbox with the same tooth surface accuracy level,the tooth contour is measured in the cases of oil lubrication,grease lubrication and dry friction with the equal load and running time,and the corresponding fractal dimension is got by the methodology of structural function. The result shows that when it is oil lubrication,the fractal dimension is the largest and the variation ranges of fractal dimension is the smallest before and after the experiment,which indicates that the less tooth wear leads to more stable dynamic performance. Through the test of efficiency and vibration characteristics,it is found that the transmission efficiency is the highest and amplitude is lowest with oil lubrication,which is consistent with the analysis of fractal dimension. The research can provide theoretical basis and application prerequisite for the subsequent micro-topography design of tooth surface.关键词：Gear dynamics;Tooth surface topography;Fractal dimension
- 4
- |
- 200
- |
- 0
发布时间：2022-10-20 - 摘要：A method of temperature control variable surface magnetorheological transmission is put forward,the magnetorheological fluid is driven by means of a temperature-controlled shape memory alloy spring,so that the working space of the magnetorheological fluid from one to two,the torque that the device can deliver is increased. Based on the characteristics of disk magnetic fluid transmission,the torque transmitted separately before and after the variable face is derived,the influence of temperature on the transmission torque of magnetorheological fluid is explored,and the magnetic field analysis is carried out by ANSYS software. Results show that the magnetic induction intensity in the working space h1 increases with the increase of the radius. In the working space h2,the magnetic induction intensity decreases with the increase of radius and then increases with the increase of radius. In the working space h3,the magnetic induction intensity increases with the increase of the radius. The torque transferred by the device increases by 91. 06% compared with the torque transmitted before the device.关键词：Magnetorheological fluid;Shape memory alloy;Variable surface magnetic fluid transmission;Torque;Magnetic field analysis
- 3
- |
- 128
- |
- 4
发布时间：2022-10-20 - 摘要：At present,most robots need to consume a large amount of energy to overcome their own gravity during operation. In order to reduce energy consumption and improve robot performance,a gravity compensation mechanism（ GCM） for a rotating joint manipulator is proposed. A non-circular gear planetary gear and torsion spring are used in the device,the gravity compensation of arbitrarily reachable working space of the manipulator can be realized,the static balancing mechanical model of the manipulator is established,the non-circular gear planetary gear train is designed according to the static balance constraint condition,and the transmission ratio distribution of non-circular gear planetary gear train is discussed. The simplest gear train that satisfied the moment balance is obtained. The design and analysis of the 2R parallel four-bar mechanism manipulator is carried out and imported into ADAMS for verification. The simulation results show that the driving torque is effectively reduced.关键词：Manipulator;Gravity compensation;Non-circular gear;Static balancing
- 3
- |
- 180
- |
- 0
发布时间：2022-10-20 - 摘要：In order to improve the transmission accuracy of the multistage gear transmission system effectively and economically,the transmission accuracy model of the multistage gear drive system based on the theory of error coupling compensation is established. A numerical analysis method is used to calculate the transmission accuracy of the multistage gear transmission system,and the corresponding initial phase of eccentric error is analyzed when the system coupling transmission accuracy is aimed at the minimum transmission accuracy. Then,the system transmission accuracies are both calculated by the Monte Carlo method when it is under the random assembly of the components and it is improved machining accuracy of some parts. Finally,by comparing and analyzing the transmission accuracy under the three situations,the results show that the transmission accuracy of the multistage gear transmission system is improved with the numerical analysis method,which verifies that the method is feasible and valid.关键词：Multistage transmission;Gear system;Transmission accuracy;Coupling compensation;Numerical analysis
- 4
- |
- 196
- |
- 2
发布时间：2022-10-20 - 摘要：In order to get a more ideal cycloidal profile,a new cycloid profile modification method is proposed. Under the circumstance of keeping the short coefficient and the eccentricity constant,the contour line of the modified tooth profile is obtained by the elliptical crocheting of the standard theoretical contour line,and the expression of the equation is deduced. Compared with the commonly used method of tooth profile modification,the modified tooth profile curve is much closer to the complete conjugate tooth profile on the main meshing areas,and the meshing clearance between the cycloid wheel and the pin wheel can be made adjustment by controlling the shape parameters of the ellipse,which is simple and flexible. The normal tooth profile clearance,initial meshing clearance,contact stress and backlash are analyzed to verify the rationality of the modified method.关键词：Cycloid needle wheel;Tooth profile modification;Initial meshing clearance;Load distribution;Backlash analysis
- 4
- |
- 125
- |
- 4
发布时间：2022-10-20 - 摘要：Hypoid gear is one of the important parts of the main reducer,its degree of tooth profile distortion directly affects the tooth surface error and the quality and consistency of the gear contact area. In order to solve the problem of uncontrolled heat treatment of gears,the distortion mechanism of gear heat treatment is studied. The 45-point topology grid error is used to analyze the law of contact zone offset. Using the special bevel gear detection equipment Gleason GMM350 and 600 HTT roller inspection machine as the carrier,by comparing the variation of the tooth surface accuracy and the offset of the contact mark before and after the heat treatment of the gear,the correctness of the theoretical analysis result of the contact zone shift is verified. The correctness of the contact zone offset theory,and experiments show that the gear heat treatment contact zone moves from the large end slightly to the tooth tip position to the middle of the tooth face.关键词：Hypoid gear;Distortion mechanism;Contact deviation;Tooth surface accuracy
- 3
- |
- 73
- |
- 2
发布时间：2022-10-20 - 摘要：A conceptual design of a parallel kinematic machine（ PKM） whose topological arrangement is a 3-PRS parallel mechanism is proposed. Based on the screw theory,the degree of freedom（ DOF） of the proposed PKM is analyzed. The results show that the 3-PRS PKM possesses one translational and two rotational capabilities（ 1T2R）. After the DOF analysis,a kinematics model is established. By solving the closed-loop vector motion equation,the analytical expression for the inverse kinematics solution of the proposed 3-PRS PKM is given. Based on the inverse kinematics solution,by considering the geometrical constraints,the reachable workspace search process is constructed,and the reachable workspace mapping of 3-PRS PKM is given. Finally,a sensitivity analysis is carried out to reveal the influences of some major dimensional parameters on the reachable workspace of 3-PRS PKM. The research results manifest that these dimensional parameters have different influences on the reachable workspace of 3-PRS PKM. Among all these parameters,the radius of the moving platform should be paid more attentions during the dimension synthesis of PKM.关键词：Parallel kinematic machine;Degree of freedom;Kinematics;Workspace
- 3
- |
- 379
- |
- 5
发布时间：2022-10-20 - 摘要：A multi-functional intelligent wheelchair based on ergonomics is designed for the needs of special care people. Through market research and social investigation,the intelligent wheelchair has the walking function,docking function,lifting function and other auxiliary functions,and the corresponding executing agency is designed. Based on CATIA software,a three-dimensional model of wheelchair is established,and ADAMS software is used to analyze the motion of the docking function module of the intelligent wheelchair,and the feasibility of the mechanism is judged. Through ANSYS software,the statics analysis is carried out for key parts and docking function modules of intelligent wheelchair,which meets stiffness and strength conditions. The prototype test shows that all the functions of the wheelchair are realized,and the maximum driving speed,the forward speed,the slope angle and the bearing capacity are all in accordance with the national standards,and meet the ergonomics.关键词：Intelligent wheelchair;Structural design;Kinematic analysis;Statics analysis
- 9
- |
- 907
- |
- 9
发布时间：2022-10-20 - 摘要：The singularity and statics performance of a 6-DOF mobile redundant parallel mechanism and its real-time optimization design are studied. The statics Jacobian matrix of this parallel mechanism is established,and the singularity and statics performance are analyzed. The statics transfer performance of parallel mechanism is improved by adjusting the leg position of the parallel mechanism. The performance spectrum based on the Jacobian matrix is drawn,the transfer performance of the statics force and moment of the parallel mechanism in different positions is observed intuitively. By above analysis shows that the redundant parallel mechanism can eliminate the singularity,while adjusting the leg position also greatly improves the static transfer performance of parallel mechanism.关键词：Redundant parallel mechanism;Jacobian matrix;Singularity;Statics performance
- 4
- |
- 184
- |
- 6
发布时间：2022-10-20 - 摘要：Aiming at the problems such as the easy wear of the cam mechanism in the traditional cam manipulator,the lack of flexibility in the output action and the single trajectory of the movement,a new design scheme for the electronic cam picking manipulator is proposed. Meantime,the software and hardware platform of the electronic cam control system is built. Among them,taking the polynomial motion law of the output cam mechanism as an example,the relationship between the output pulse number of the servo system and the movement law of the follower is deduced. Using PMsoft software to program and output the electronic cam curve,the curve conforms to the expected polynomial motion law. According to different production requirements,the system can change the output motion curve by changing the parameters setting of the electronic cam. It provides a design method and an example for the flexibility of the manipulator output motion process and the diversification of the trajectory.关键词：Picking manipulator;Electronic cam;Control system;Electromechanical integration;Fexibility
- 4
- |
- 241
- |
- 2
发布时间：2022-10-20 - 摘要：The modification design based on parametric gear model can improve the meshing performance rapidly and effectively. Parametric tooth profile and tooth helix modification of the fully parametric spur gear are carried out in the UG. The finite element simulation is performed by using Hypermesh and Workbench to obtain the gear meshing characteristics under different conditions. The simulation results show that for the same working condition,choosing the proper method of modification and modification parameters can obviously improve the meshing effect. At the same time,through the gear bench test,comparing the gear vibration data before and after modification,it is found that the gear vibration performance of the modified gear are obviously better than that of the unmodified gear. By analyzing the results of simulation and experiments,the modification of tooth axial of drum shape has a better effect on the partial load of tooth flanks and the profile modification has a significant effect on the improvement of load distribution between teeth. The optimum modification method and the amount of modification can quickly obtained by the parametric modification of gear which short the R & D cycle and provide an important theoretical reference for practical engineering.关键词：Parametric modeling;Parametric modification;Tooth surface load distribution;Finite element simulation;Gear bench test
- 3
- |
- 125
- |
- 1
发布时间：2022-10-20 - 摘要：It is one of the important tasks of the remote operation to perform internal maintenance in the nuclear fusion reactor by the teleoperation manipulator. Because of the key joint of the manipulator will bear excessive load during maintenance,and the main reducer of the manipulator must have a self-locking function,and special functional requirements such as space for cable channels are reserved in the middle of the main reducer. The 2 K-H NN multi-planetary gear mechanism is used as a model to analyze the constraints and design conditions. The number of tooth combinations satisfying the conditions are selected through programming and the calculation of the load on dangerous gear and transmission efficiency is verified. A design Scheme of heavy-duty reducer with high-capacity,compact structure,self-locking function is obtained.关键词：Nuclear fusion facility;Heavy-duty manipulator;lanetary mechanism
- 2
- |
- 169
- |
- 0
发布时间：2022-10-20 - 摘要：In order to realize the integration,intelligent,and lightweight of the humanoid hand,by using the micro motor with the rope combination of turbine disk drive way,the model of finger is made by 3D printer and the hand size is 1: 1,total weight is 300 g. Worm gear combined with rope drive mode is adopted to realize the humanoid hand has larger output force and high safety under the small volume. By reverse winding of elastic rope and drive rope with worm gear plate,the resistance is reduced in the process of driving,the effective output force of finger is improved. Then,the adaptive grasping of humanoid hand is studied,and the results show that,the humanoid hand can effectively realize the size of the object and output the expected force,and realize stabilize grapping by using the joint control method of bending sensor and pressure sensor.关键词：Micro motor;Worm gear plate;Bend sensor;Pressure sensor;Adaptive grabbing
- 5
- |
- 203
- |
- 1
发布时间：2022-10-20 - 摘要：A snake like robot model based on new involute spherical gear is proposed. Firstly,the structure and working principle of snake like robot are introduced,the structural characteristics of 3D printing involute spherical meshing gears are analyzed. The design and analysis of a single bone joint with real time controllable yaw angle and position composed of yaw unit and driving unit are carried out. Then,the position coordinates of snake like robot with 5 bone nodes are analyzed. Finally,the movement of single bone and snake like robot is simulated and the motion simulation and experiment of single bone joint real object are carried out. The results show that the design is feasible and effective.关键词：Snake-like robot;Involute spherical gear;3D printing;Bone joint movement
- 3
- |
- 245
- |
- 1
发布时间：2022-10-20 - 摘要：The multi-constraint optimization design for the bevel gear-NGW planetary gear train-cylindrical gear transmission system of dispatch winch is conducted. The minimized overall volume of the transmission system is regarded as the objective function,and based on this,the multi-constraint condition is constructed,which comprehensively considers the teeth,modulus condition,transmission ratio,contact ratio,contact strength,bending strength,diameter of axle and structure conditions. The Fmincon function in MATLAB is used to solve the multi-constraint optimization. The optimization results of design variables and optimization parameters of all transmission subsystem are obtained,and it indicates that the volume of the transmission system decreased by 32. 59% after optimization. Based on this,the 3D model and finite element analysis model of the transmission system are established. According to the modal analysis of the optimized transmission system,it verifies that the optimization results can simultaneously satisfy the optimal volume and stability criteria. The results can provide reference for the optimal design of the transmission system of dispatch winch.关键词：Dispatch winch;Transmission system;Multi-constraint optimization;Volume optimization;Modal characteristic
- 4
- |
- 105
- |
- 2
发布时间：2022-10-20 - 摘要：Aiming at the problem that the tilting error caused by the clamping gear with expandable core shaft affects the accuracy test of the gear,the cause of the tilting error is analyzed based on positioning principle of gear clamping. By using the Small Displacement Torsor（ SDT） Method,the tooth surface model with error is constructed,the influence of clamping tilting error on gear deviation accuracy is analyzed. The nine deviation indexes of three clamping angles of gears are detected by gear detection center,playing table alignment method setting three clamping angle,the influence law of clamping tilting error on gear precision detection is obtained.The results show that,the great influence of clamping tilting error on gear detection accuracy is fHβ,Fβ and Fp,the less important influence is ffα,fHα and Fα,the influence is insensitive or subtle is ffβ,fpt and Fr,so that further improve the gear clamping process theory.关键词：Gear clamping;Tilting error;Gear accuracy;Gear testing
- 4
- |
- 103
- |
- 4
发布时间：2022-10-20 - 摘要：The Innovative Movable-teeth CVT（ iMCVT） is a new type of non-friction continuously variable transmission,in the process of transmission,there will be fluctuations in rotational speed and torque. In order to investigate the influence of the tension to the fluctuations of the rotational speed and torque,based on the structure and work principle of iMCVT,the causes of iMCVT fluctuations are analyzed. Based on ADAMS,the dynamics simulation model is built. The effect of tension force on the iMCVT transmission fluctuation is studied by changing the tensioning force of the tensioning device on the metal tooth chain. The simulation results show that when the transmission ratio is 1,increasing the tension force can reduce the fluctuation of the rotational speed,when the tension force reaches a certain value（ about 600 N）,the fluctuation of the rotational speed tends to be stable. On this basis,through the formula to calculate the transmission efficiency curve,and in a certain range,increase the tension can improve the transmission efficiency,too much tension can lead to the decline of transmission efficiency. The results of this study laid the foundation for the control of iMCVT tension.关键词：iMCVT;Transmission fluctuation;Tension;Adams simulation
- 4
- |
- 73
- |
- 0
发布时间：2022-10-20 - 摘要：The periodical variation of meshing stiffness of the gear pair is the main internal excitation of the vibration generated by the planetary gear transmission system. It is of great significance to deeply study the meshing stiffness of the gear system for the vibration characteristics of the gear system. The energetic method,the finite element method and the rectangular wave method are used to establish the meshing stiffness model of planetary gears respectively. These three models are used to solve the integrated meshing stiffness of the solar wheel,planetary gear and internal ring gear respectively. Then,the advantages and disadvantages of these three models for calculating mesh stiffness are compared. The results show that the vibration acceleration amplitudes of compound planet gear members under these three kinds of stiffness excitations have a small difference. The amplitude of vibration acceleration calculated by the finite element method is slightly larger than that calculated by the analytical method,and the amplitude of the acceleration calculated by the rectangular wave method is the smallest.关键词：Planetary gear;Meshing stiffness;Modeling method;Parameter optimization
- 8
- |
- 275
- |
- 3
发布时间：2022-10-20 - 摘要：For the fault diagnosis of the pitting,gear wear and tooth breakage in the gearbox of wind turbines,a fault diagnosis method based on EEMD and wavelet threshold denoising and cuckoo search to optimize BP neural network is proposed. The EEMD decomposition and wavelet threshold denoising method are used to preprocess the fault vibration signals and suppress the noise interference in the original vibration signals. The cuckoo search is used to optimize the BP neural network to diagnose the preprocessed signals. The wavelet threshold can better denoise the high frequency components in the EEMD decomposition,and the CS-BP neural network has accurate pattern recognition accuracy and excellent global optimization ability. The simulation shows that the diagnostic method has good accuracy,speed and success rate,and is of high use significance.关键词：Wind power gearbox;Fault diagnosis;EEMD decomposition;Wavelet threshold denoising;CS-BP
- 6
- |
- 517
- |
- 23
发布时间：2022-10-20 - 摘要：According to the requirements of a spacecraft,a double input planetary reducer is designed,and the most loaded gear is checked using traditional methods and finite element software. Due to the existence of a large axial force,the finite element strength check and axial stiffness check of the reducer box are completed. Bearing capacity test and axial stiffness test of the reducer is completed to verify the correctness of the check. The traditional gear root strength checked method is based on the beam theory of mechanics of materials.The gear teeth are treated as cantilevers with unidirectional tension or compression,but actually,each element is in three dimensional state of stress. The Von-Mises equivalent stress obtained by finite element method,which is based on the fourth strength theory,can better serve as a check criterion.关键词：Double input planetary reducer;Strength check;Finite element;Strength theory
- 3
- |
- 97
- |
- 0
发布时间：2022-10-20 - 摘要：To study the influence of different bearing clearance on the angular transmission error of RV reducer,the characteristics of the angular transmission error as the combination forms of different bearing clearances are obtained through applying dynamics simulation work on a simulation model of RV reducer,which containing cycloidal gear profile modification,bearing clearance and nonlinear contact of gears. By analysis of orthogonal test on the basis of above,the sensitivity and influence law of the different bearing clearance on the angular transmission error of RV reducer are analyzed. Furthermore,the bearing clearance can be designed targeted by dimension tolerance control,which provides a useful reference for the design and manufacture of RV reducer.关键词：RV reducer;Angular transmission error;Multi-body dynamics simulation;Orthogonal test
- 3
- |
- 308
- |
- 3
发布时间：2022-10-20 - 摘要：In order to analyze the influence of the tool installation error on the tooth profile surface of the face gear,the meshing coordinate system of the face gear machining with the tool installation error is established. The tooth profile surface equation of face gear is derived by using the enveloping principle. The model of the tooth profile surface with the tool offset and the crossed axes angle error is built by using the numerical simulation method,the influence of tool offset and crossed axes angle error on the face gear tooth profile surface is analyzed. The research result shows that the profile surface of the face gear is not sensitive to the installation error of the tool.关键词：Face gear;Machining error;Tooth profile
- 5
- |
- 77
- |
- 1
发布时间：2022-10-20 - 摘要：Aiming at the transient impact of the abrupt load on the ring chain under the fault of the scraper conveyor chain jammed,taking the Φ18 mm×64 mm C class mining ring chain as the research object,by using the ANSYS/LS-DYNA finite element software,the nonlinear chain contact dynamics analysis under the condition of the chain jammed is performed,the change law of the acceleration,velocity,energy and contact force of the ring chain and the main position of the ring chain damage are obtained. A theoretical basis for researching the damage mechanism of mining ring chain transmission under the condition of fault is provided.关键词：Mining ring chain;Chain jammed;Dynamics characteristic;Contact analysis
- 3
- |
- 98
- |
- 2
发布时间：2022-10-20 - 摘要：The singularity in the working space of harvesting robotic manipulator is analyzed. Firstly,the D-H parameters are used to establish the coordinate system of the harvesting robot manipulator,and then its positive equation of motion is obtained. Secondly,the Jacobian matrix is constructed by combining the positive equations of the manipulator,and then the Jacobian matrix is used to solve all the structures of the singular state of the manipulator,all singularities are obtained. Finally,by using the Robotics toolbox,the singularity of the manipulator is simulated and analyzed based on the flexibility index of maneuverability and the flexibility index of minimum singular value. The simulation results show that there are three kinds of internal singularities in the studied manipulator. At the same time,the correctness of the singularity of the manipulator is verified,which lays a foundation for the following research on the trajectory planning of the manipulator and the avoidance of the singularity point.关键词：Manipulator;Singularity;Jacobian matrix;Flexibility
- 5
- |
- 207
- |
- 4
发布时间：2022-10-20 - 摘要：According to the inhibitory effect of initial residual stress produced by cold rolling process on crack initiation and crack propagation,taking the cold rolling flexspline of harmonic reducer as the research object,the SWT method and fracture mechanics theory are used to carry out theoretical analysis of crack initiation life and crack propagation life of cold rolling flexspline respectively,and the verification of each other is carried out by using the simulation analysis of the fatigue analysis software nCode Design-Life. The results show that the fatigue life of cold rolling flexspline are better than the machining flexspline in various stages,and the working life of the harmonic reducer is prolonged. The research results verify the advantages of cold rolling process of flexspline,and have important reference value for improving the performance of flexspline.关键词：Cold rolling flexspline;Residual stress;Fatigue life;Simulation analysis
- 4
- |
- 251
- |
- 6
发布时间：2022-10-20 - 摘要：In order to judge the running status of rolling bearing effectively in the case of small sample,by using the local mean decomposition（ LMD）,the rolling bearing vibration signal is decomposed. The complex multi-component signal will be decomposed into multiple single component signals. For the characteristic that the distribution of decomposed single component signal is not uniform in the frequency range,by using the LMD energy entropy,the fault feature of rolling bearing vibration signal is extracted. The experimental results show that LMD energy entropy has a strong signal characterization capability,which can effectively extract the rolling bearing fault characteristic.关键词：Rolling bearing;Local mean decomposition;Energy entropy;Feature extraction
- 4
- |
- 338
- |
- 12
发布时间：2022-10-20 - 摘要：According to the requirement of anti-fatigue manufacture and characteristics of hypoid gear tooth profile,a special cold rotary forging scheme is put forward. By using the orthogonal numerical simulation,the influence law of process parameters on experiment index,the forming force and maximum springback of tooth surface,are studied through numerical simulation,and the optimal combination of process parameters within a certain range is got,and the regression analysis and correlation test of simulation results are performed.This research result can provide certain reference value for process design in actual production.关键词：Hypoid gear;Cold rotary forging;Process optimization;Orthogonal numerical simulation;Regression model
- 4
- |
- 82
- |
- 0
发布时间：2022-10-20 - 摘要：To handle the numerous and jumbled data from fault monitoring systems,considering information missing with the single channel signal and the complexity and non generality of traditional intelligent diagnostic manual extracting features,a method named full vector deep learning in intelligent fault diagnosis of rolling bearing is put forward. Firstly,full vector spectrum is used to fuze the binary channel signal,the main vibration vector data after full vector fusion is acquired,the disadvantage of incomplete single channel vibration signal is overcome. Then,a full-vector deep neural network is built on this basis,combining sparse coding and de-noising coding algorithm,the fault features can be extracted automatically. Finally,the back-propagation algorithm is used to fine-tune the whole network. Experimental results show that the presented method can extract more effective fault features automatically,the classification accuracy and stability of diagnosis are improved,and the complex process of traditional methods is improved.关键词：Intelligent diagnosis;Deep learning;Full vector spectrum;Sparse auto-encoder
- 3
- |
- 334
- |
- 8
发布时间：2022-10-20 - 摘要：Based on the wavelet neural network algorithm,the vibration signals of the automobile gearbox is analyzed from the time domain and the frequency domain,and the values with time domain and frequency domain characterization are extracted,and a method of BP neural network algorithm for the fault diagnosis of the automobile gearbox is designed. The fault of the gearbox is analyzed and extracted by empirical mode decomposition method in of the time-frequency domain. In addition,the method of BP neural network algorithm and the diagnosis models is erected. The JZQ-250 gearbox is used to train the algorithm of neural network algorithm to meet the needs of fault diagnose. The experimental results show that the BP neural network algorithm can reflect the correction of diagnosis under complicated fault of the automobile gearbox,which is of great practicality for fault diagnosis of the automobile gearbox. An idea and some experience for vehicle gearbox fault diagnosis in practice are provided.关键词：Vehicle gearbox;Time-frequency character;BP neural network;Fault diagnosis
- 5
- |
- 326
- |
- 15
发布时间：2022-10-20 - 摘要：In the process of on-pole rice noodles production,a new type of the tipping bucket mechanism is developed in order to meet the needs of continuous,fast,stable fetching and feeding. According to the function requirements of the tipping bucket mechanism,the corresponding design scheme is put forward. Through the comparison,the form of motion and transmission of tipping bucket mechanism is determined. Based on the motion mechanism of the tipping bucket mechanism,the motion model is established based on the movement of the mechanism,which is also called the double slider mechanism. On this basis,the kinematics analysis is carried out,and the change rules of the angle,angular velocity and angular acceleration with sliding block chain moved is derived. In the process of production,the motion equation of the tipping bucket is established to make the bucket rotate at a constant speed. The change rule of sliding block chain speed is obtained from the theory when the tipping bucket is used as the original moving part,and the kinematics parameters are provided for the intelligent control of the mechanism.关键词：Tipping bucket mechanism;Double slider mechanism;Kinematics analysis;Constant speed motion
- 4
- |
- 120
- |
- 0
发布时间：2022-10-20 - 摘要：High speed,high mobility and high adaptability become the inevitable developing trend of quadruped robot,bionic joints as an important basis of moving parts,plays an important role about the kinematics and dynamics research of quadruped robot. Specific from four aspects of flexible pneumatic bionic joints,hydraulic damping bionic joints,series-wound elastic drive bionic joints and flexible variable stiffness bionic joints,the research status of quadruped robot bionic joints is summarized,and the various types of bionic joint defects are accurately analyzed. Finally,the future develop trend of quadruped bionic robot joints is described.With the deepening of the research,the quadruped robot bionic joint will have widely application prospect in production services,human exploration,future war and other special fields inevitably.关键词：Quadruped robot;Bionic joint;Flexible pneumatic;Hydraulic damping;Elastic drive
- 8
- |
- 1100
- |
- 4
发布时间：2022-10-20 - 摘要：The magnetic gear has the advantages of no friction between the rotor,simple manufacturing and installation,low cost and so on,it is an excellent transmission mechanism. The development history of magnetic gears from time to time is briefly described,and the research status of magnetic gears at home and abroad is compared. The topological structure of several kinds of common magnetic gears are introduced,and the advantages and disadvantages of these kinds of magnetic gears are compared. Its future development direction and research questions are summarized.关键词：Magnetic gear;Development history;Topology structure;Research question
- 14
- |
- 419
- |
- 3
发布时间：2022-10-20 - 摘要：With the development of industry,harmonic gear drive technology has been more and more applied with its special advantages. The principle,characteristics and application of harmonic gear drive are briefly introduced,the domestic and foreign development situation of it is briefly summarized,a detailed analysis of the research focus and development trend,and general discussion are carried out.关键词：Harmonic gear drive;Drive principle;Development situation at present;Research focus
- 12
- |
- 822
- |
- 20
发布时间：2022-10-20
- Technical support is provided by Beijing Founder electronics co., LTD 豫ICP备05013835号-5
京公网安备11010802024621 - It is recommended to read the content of this site in Chrome&IE9+. Please switch to extreme mode in browser 360.
- Cookies We use cookies to help provide and enhance our service and tailor content. By continuing, you agree to the use of cookies.
0