最新刊期
期 8 ， 2015
- 摘要：By using Melnikov method,the necessary condition of the chaotic motion is established through the calculation of Melnikov function. Furthermore,the edge of chaos of the dynamics system is obtained. The results are verified by the other methods of analysis chaos,such as bifurcation diagram,phase diagram,time domain waveform,and maximum Lyapunov exponent. It is demonstrated that,by using the obtained results can provide a convenient means to design a nonlinear simple pendulum with periodic motion.
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发布时间：2022-10-20 - 摘要：The transmutation point location is achieved according to the enveloping worm pair mesh equation. The tooth parameter equations of enveloping worm pair transmutation point is established and the relationship between transmutation point and worm gear tooth surface when the transmission ratio and center distance changing separately and at the same time are respectively discussed. Then,the fitting curves of the transmutation point changing with the transmission ratio and center distance,the relationship of them is illustrated. The conclusion that the transmutation point is more and more far away from the worm gear tooth surface with the increasing of the transmission ratio and center distance is obtained. It has important practical significance of the processing and the structural analysis of worm gear tooth surface,worm pair manufacturing,assembly and parameter modification.
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发布时间：2022-10-20 - 摘要：Considering solid particle,the elastohydrodynamic lubrication model of spur gear under oscillation condition is set up. The influences of solid particle on elastohydrodynamic lubrication of spur gear under sine law oscillation condition are studied,taking time- variant effect into account. The influence of a single solid particle,solid particles distribution density and solid particles speeds on oil film pressure and film thickness are analyzed. The results show that,the oil film pressure and film thickness under oscillation condition are in the cases of a similar double hump shape distribution. Considering solid particles centre film pressure and the maximum film pressure vary little,but centre film thickness and the minimum film thickness decrease remarkably. The greater solid particle distribution density is,the larger centre film pressure and the maximum film pressure are. The greater solid particles distribution density is,the thinner centre film thickness and the minimum film thickness are. The solid particles make evident differences to the minimum film thickness,if speed of solid particles is high,the minimum film thickness diminishes dramatically.
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发布时间：2022-10-20 - 摘要：A translational- torsional coupling dynamics model of planetary gear transmission on the low speed shaft in 2. 5 MW wind turbine gearbox is built by using lumped- parameter method. Through comparing the inherent frequency of the three planetary gears under the conditions of the mesh stiffness are equal and taking the same average mesh stiffness with the conditions of the different mesh stiffness which are influenced by meshing phase difference,the conclusion that the influence of different combination of mesh stiffness under the influence of meshing phase difference on the low inherent frequency is less,but have much more influence on the high inherent frequency is obained. This analysis of inherent frequencies laid a foundation for dynamics analysis of the planetary gear transmission system in 2. 5MW wind turbine.
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发布时间：2022-10-20 - 摘要：A kind of parallel series robot is designed,the characteristic are as following: shoulder and elbow joints are transferred out by parallelogram linkages and driven by ballscrew,which makes it own larger rigidity and better dynamic performance. It keeps the good characteristics of larger workspace series robot. The kinematics analysis of this robot is carried out,the workspace is solved by means of an improved way of printing points,and then,the boundary analysis method is proposed to calculate the workspace. The results show that the computation of the boundary analysis method is smaller and the result is clear. The volume and performance index are calculated based on the solved workspace. And it proves that this kind of robot has better workspace property.
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发布时间：2022-10-20 - 摘要：Aiming at the severe fever,vibration and loud noise and so on are the outstanding problems of three- ring gear reducer,a finite element model of gear- rotor- bearing- housing system with thermo- elastic coupling is established. The temperature field of the three- ring gear reducer is obtained,the results show that the input shaft bearings is the main heat source. Based on the result,the thermal elements is converted to the structural elements in ANSYS,the node temperature of the model is load,then the natural frequency and vibration model is obtained. Then the internal gear dynamic incentive is applied to carry out the numerical simulation of dynamic response. The results show that,after taking thermo- elastic coupling into consideration,the natural frequency is reduced,the vibration displacement of housing and acceleration are increased. A certain theoretical basis for the parameter optimization and reasonable design of heat dissipating system of the three- ring gear reducer is provided.
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发布时间：2022-10-20 - 摘要：Aiming at the complexity of the dynamics characteristic of launch working condition and the vehicle itself,a robust adaptive fuzzy neural controller is designed for the slip- friction phase of launch performance of vehicle with dual clutch transmission（ DCT）. In the control system framework of dual clutch automatic transmission,the designed controller is middle layer controller. By tracking the target engine speed and the vehicle target launch velocity deduced by the target impact degree,the target torque of engine and the target transmit torque of clutch are obtained. The simulation result on the Matlab / Simulink platform shows that RAFNC for launch has a better tracking effect when compared with PID controller.
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发布时间：2022-10-20 - 摘要：For the problems of heavy type construction vehicle change greatly work condition and the poor driving characteristics in the process of driving,through the introduction of the engine throttle and brake torque control in the vehicle,the heavy type construction vehicle mathematical model is established,a comprehensive control strategy for complex road surface condition of heavy construction vehicle traction is put forward.
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发布时间：2022-10-20 - 摘要：To the problems of design and manufacture high- cost,poor universality of the heavy duty and large travel motion mechanism at present,a new motion mechanism adopting belt drive system is proposed as the main driving type,and according to the reliability design and optimization design theory,the transverse vibration and reliability of key components of the drive system of belt drive system are researched.
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发布时间：2022-10-20 - 摘要：In order to solve the traditional wind power equipment problem of energy recovery interval is narrow,state stability is poor when high wind speed condition,through the introduction of geometric type hydro- mechanical CVT in the traditional wind power generation system,a new type of high load transmission ratio variable type wind power generation system layout scheme is obtained. Finally,through numerical modeling method,the new transmission scheme of arrangement theoretical modeling is built,the law of variation of the main parameters before and after introduction of CVT of wind power generation system is researched.
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发布时间：2022-10-20 - 摘要：The module partition is the key step and foundation of module design. Firstly,the fuzzy similitude matrix between the parts is constructed according to the analysis of the functional correlation,geometric correlation,physics correlation among parts. Secondly,the partitioned modules are evaluated by high cohesion and low coupling. Finally,the products is classified by using the simulated annealing and genetic algorithm（ SAGA）,which is proved to be an efficient and rational way for module partition through the reducer instance.
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发布时间：2022-10-20 - 摘要：Based on the process requirement of a certain type packet machine,firstly,a new composite-mechanism based on gear- parallelogram mechanism is proposed,and the problem of singular point of structure is solved by composite- mechanism. Secondly,the problem of dynamic balance is solved by the structure designed. Then,the modal analysis and vibration test are carried out. The result of the time domain analysis and frequency domain analysis show that the vibration of new structure is more smaller than primary mechanism under the working condition of the 400 r / min. Under the working condition of 500 r / min,it has smooth movement,small vibration.
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发布时间：2022-10-20 - 摘要：The spiral bevel gear have the characteristics of design and processing parameters complexity.On the basis of a lot of high speed dry cutting technology parameters of the spiral bevel gear are collected and evaluated,based on the Microsoft SQL Server 2008 database development platform,the high speed dry cutting technology parameters database for spiral bevel gear is established and these parameters included machine tool,cutting tool,fixture,workpiece,and machining. The application program of database is developed based on Visual Basic 6. 0,and the basic functions of the database,such as query,add,modify,delete are realized.The spiral bevel gear processing required technical parameters can be rapidly obtained by this database system.It will play a significant role to improve the cutting efficiency and the machining quality,and reduce the processing cost.
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发布时间：2022-10-20 - 摘要：A novel 3- PUU parallel mechanism is proposed,the kinematics analysis of the parallel mechanism is carried out and the kinematics inverse solutions of the 3- PUU parallel mechanism are obtained. Based on the previous works,the constraints conditions on the mobile side and Hooke in the workspace are analyzed.By using the three- dimensional limit search method,the workspace is solved. The workspace of the parallel mechanism is analyzed and optimized,which laid the foundation for the design of the parallel manipulator mechanism and the further study. The results show that,the parallel mechanism has a good application prospect.
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发布时间：2022-10-20 - 摘要：The benchmark tooth profile of gear cutter is designed to a sine curve. The gear conjugate profile is solved by tooth profile normal method. The meshing line,curvature and relative sliding ratio are analyzed,and then the bending strength is analyzed through the finite element analysis software ANSYS. The results show that the meshing line is similar to a splay,and the value of curvature and relative sliding ratio is small compared to the involute spur gear pair,and the maximum bending stress occurs in the dedendum which is smaller than the involute gear maximum bending stress.
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发布时间：2022-10-20 - 摘要：The lower limb rehabilitation robot is an automated functional rehabilitation equipment,with a scientific and reasonable rehabilitation conditions,the patients can make their lower extremity motor function get good recovery. In order to improve the rehabilitation training work space of the lower limb rehabilitation robot,increases the bearing capacity,the statics analysis of rehabilitation robot is very important. A kind of lower limbs rehabilitative robot with 3- UPS parallel mechanism as the mechanism prototype is puts forward,the statics equations of the lower limb rehabilitation robot driving force and output force are established based on the virtual work principle,the static performance evaluation index is defined and the evaluation index distribution map is drawn. The relationship between the structure parameters and the statics performance evaluation indexes is analyzed,the influence of structure parameters on the statics performance is obtained. And the lower limb rehabilitation robot is designed based on the structure parameters. The analysis results lay a foundation for further analysis and research of the lower limbs rehabilitative robot.
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发布时间：2022-10-20 -
Simulation and Analysis of Motion Space of Spatial Series Mechanism of Two to Six Degrees of Freedom
摘要：Aiming at spatial series mechanism used in the theory of mechanism,a motion space equation for a six- DOF is built by using the D- H homogeneous coordinate transformation. The virtual prototyping models are built from the two to six- DOF with the mechanical dynamics analysis software ADAMS. Based on the virtual prototyping technology,the motion spaces of spatial series mechanism from two to six- DOF are simulated and analyzed. The conditions for non- blind area are also given.- 2
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发布时间：2022-10-20 - 摘要：Aiming at the optimal design of gear transmission of mooring winch with non- linear and multi- constraint and multi- factors,two- stage fuzzy optimization is put forward. Taking the mooring winch gear transmission mechanism of minimum volume as the design objective function and the design variables and performance constraints as the constraint conditions of fuzzy optimization,the fuzzy optimization design of gear transmission mechanism of mooring winch is carried out by using the optimization toolbox of Matlab. The result of optimization design show that,the more compact structure can be got,the material is saved and the weight of mooring winch is reduced.
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发布时间：2022-10-20 - 摘要：In view of the lunar module load limit and lunar complex terrain,the manned lunar mechanism must be light and simple,and has a smaller turning radius,so one type of steering mechanism is designed. The inner and outer wheel turning angles mathematical model is deduced. Based on Ackerman- geometry steering theory,the optimized mathematical model of the steering mechanism is established. By the model optimization and results analysis,the best steering mechanism parameters are obtained. The steering mechanism ADAMS simulation model is established to verify the rationality of the prior analysis,the stress condition of key bars of the steering mechanism is analyzed by using finite element analysis software.
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发布时间：2022-10-20 - 摘要：Based on the crank link mechanism and hydraulic drive,a hexapod walking mechanism is designed and developed. The walking leg mechanism is analyzed and its mechanics model is built. The kinematics and dynamics of this walking leg are analyzed,and the devices of the hydraulic system for walking mechanism are calculated and selected. The motion relationship between hexapod walking mechanism and walking leg is determined,a reference value for in- depth research and design of gait planning and control system in hexapod robot is provided.
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发布时间：2022-10-20 - 摘要：The structure and operational principle of the rammer device with crank- link mechanism and gear and rack is introduced. Its movement is simulated by using virtual prototype technology and taking the 122 mm shell transmission as example. The theoretic calculation and simulation analysis show that,the movement of the rammer device is reliable,and under the premise of the same enforcement ramming distance and the shot velocity at the end of enforcement ramming distance,compared with the ramming by constant force,the rammer device has the advantages of short feeding time,acceleration stable and small shock to the shot at the begin time of transport.
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发布时间：2022-10-20 - 摘要：To the problems of wet clutch designs of heavy type vehicle are more conservative,the high production cost and so on. Through the adaptive function transformation to determine initial temperature,combining with the success- failure method and the variable metric method,the traditional Metropolis algorithm is improved,and the improved method is applied to the optimization design of wet clutch of heavy type vehicle.Finally,the model after optimization are verified by the theoretical and experimental.
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发布时间：2022-10-20 - 摘要：The structure improvement design of the traditional fixed pedrail robot is carried out to make the guide wheel angle can be adjusted and the pedrail can be automatic tensioned after adjustment. The theoretical calculation analysis of the obstacle- navigation ability of the pedrail robot is carried out,the change trend of the center of mass is detected by using pro / E modeling,and the optimization of center of mass is carried out. The optimization result show that,through adjusting the angle of front guide wheel,the obstacle- navigation height,span,groove width and climbing angle of fixed robot are improved,the feasibility of the improved robot is verified. Compared with the traditional fixed tracked robot,the obstacle- navigation ability can improve and enhance,compared with four swing arms tracked robot,it has the advantages of traditional fixed tracked robot.
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发布时间：2022-10-20 - 摘要：Aiming at the problems of traditional disk brake in design process high artificially randomness and design results conservative,a disc brake is regarded as the research object,the uncertainty theory and response surface model is introduced into the design process,and the brake temperature change and the amount of braking brake distance change are also regarded as the main basis of design,the optimization calculation workload is simplified by using the preference aggregation method. Finally,the result of robust design analysis is verified by the analysis of braking distance and braking temperature. The results show that,through the calculation of the pareto solution set of braking distance and temperature and selecting a reasonable combination of μf,δf,the robust design model parameter can be obtained,the efficiency of design is greatly improved. Through the finite element analysis of the disc brake model of robust design,the strength and temperature of model are all meet the model using requirements.
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发布时间：2022-10-20 - 摘要：A mathematical model is established for the whole tooth surface generation of the Oerlikon cycloidal hypoid gear,which includes the work flank and the tooth base surfaces,based on it,the tooth 3D model is obtained. To avoid the complicated derivation of the surface curvatures and the relative curvatures which general used to calculate the boundaries and the major axes of the contact ellipses in the past,a modified tooth contact analysis（ TCA） model is proposed which based the equations of the two mated tooth surfaces and need not to make secondary approximation,so it can correctly simulating the characteristics of the instantaneous contact area. Finally,a surface generation and TCA program is developed for Oerlikon cycloidal hypoid gear. The feasibility of this method is verified through analyzing the results obtained from Klingelnberg KIMo S5 software and the rolling test experiment,and this may serve as the foundation for loaded TCA and stress analysis.
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发布时间：2022-10-20 - 摘要：The manifold learning algorithm is a method of nonlinear data dimensionality reduction and can get available low dimensional geometry,it is also better reflects the nature of things. In order to improve the classification ability of gearbox vibration signals,a new feature extraction method from fault signals of gearbox vibration based on the manifold learning method（ MLM） is proposed. The results show that the fault feature information of gearbox vibration can be MLM effectively extracted and the different types of fault feature information can be separated. The diagnostic accuracy of features extracted by MLM is higher than that of the time domain statistical method.
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发布时间：2022-10-20 - 摘要：The generating method is adopted for processing arc tooth face gear to ensure the meshing precision of arc tooth face gear pair. The tooth face contact model is established with assembly misalignment. By application of the elastic contact mechanics,finite element influence matrix method and mathematical programming method,the load tooth contact analysis for arc tooth face gear is carried out,the load distribution and contact stress of tooth surface pair are studied in different installation error. Compared to the spur tooth face gear pair,the arc tooth face gear pair has the big overlap ratio,the small contact stress,the stability of transmission,the high loading capacity,and the small sensitivity toward installation error. The method for the tooth face gear pair provides systematic theoretical direction such as the design,the experiment and the application.
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发布时间：2022-10-20 - 摘要：Based on finite element method,the aviation involute spline pair model is built,the numerical calculation of the tooth surface friction work of the spline pair tooth surface contact. The influence of the axis deviation on main parameters of involute spline pair is analyzed,the changes law of the maximum tooth friction work is obtained. The results show that,the friction work will increase with the value of axis deviation increasing,while increment slows down; the friction work will increase with friction coefficient increasing,while increment is comparatively constant. The increment of friction work is significant when pore diameter of external spline is especially large,the friction work goes to besteady when contact length is larger than 0. 45.
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发布时间：2022-10-20 - 摘要：The gearbox housing is the most complex structure in transmission,which suffered multi-source dynamic excitation. The damage of dynamic load is much greater than static load. The rigid- flexible coupling multi- body dynamics model of the gear transmission system is built,the dynamic force response of bearing seat and the dynamic force of the point of suspension under the random road excitation spectrum under the gear time- varying stiffness,damping,meshing error and the torque ripple of the ISG is solved. On this basis,the dynamic response analysis of housing is carried out by using a mode superposition method. The results show that,the overall design is more conservative relatively,but the middle of the plate- type parts have large deformation,smaller stiffness and need to focus on early in the design.
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发布时间：2022-10-20 - 摘要：Based on Hertz theory,the engagement rigidity model of the cycloid ball transmission is established,and the engagement rigidity is converted to the dimensionless form. The influence regularity of the structural parameters on the dimensionless engagement rigidity of cycloid ball engagement pairs is analyzed. The equivalent torsional rigidity formula of the planetary transmission section is deduced by using the engagement rigidity. On the basis of considering the the equivalent torsional rigidity of the input shaft,the output shaft and the planetary transmission section,the 4 freedoms torsional vibration model of the NN cycloid ball transmission is established,and the analysis of example is carried out.
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发布时间：2022-10-20 - 摘要：The filtering reducer structure principle and multi tooth elastic meshing effect are introduced,with the help of explicit dynamics software ANSYS / LS- DYNA,the three- dimensional nonlinear finite element contact analysis model is established,the dynamic meshing simulation of gear transmission mechanism under a certain speed and different load torque is carried out,the tooth surface contact stress,tooth root bending stress distribution and the rules of contact force changes under the condition of multi tooth contact with time are obtained,a theoretical basis for further filter reducer gear strength analysis and fatigue life calculation is provided by this method.
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发布时间：2022-10-20 - 摘要：A pair of undamaged gears and a pair of gears with crack on the root of tooth are simulated and analyzed by using the LS- DYNA,and the change of the acceleration signals and meshing force of any node on the gear can be got. Through the simulation calculation,the meshing force and node acceleration curve can be observed to understand the influence of the meshing impact force on gear body. The study shows that,the influence of the tooth root crack on gear transmission can accurately be simulated by using the LS- DYNA,and all these curves have strict periodicity. A new kind of thought and method for gear fault diagnosis will be provided.
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发布时间：2022-10-20 - 摘要：According to the special structural forms of AMT clutch,in order to get the temperature rise characteristics of clutch friction with different material parameters under Specific conditions. Firstly,the 3D model of pressure plate and friction plates are established,the heat transfer physical model of AMT clutch is analyzed,the thermal boundary conditions of clutch is determined. Then,by using the software of ANSYS,the transient temperature field of pressure plate and friction plates are simulate,and the temperature rising curve is got. Finally,the simulation result of finite element analysis is verified through the AMT clutch comprehensive performance test bench. The results have important significance for AMT clutch structural optimization design and material selection.
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发布时间：2022-10-20 - 摘要：The natural frequency and modal analysis of globoid indexing cam mechanism are studied.Through the establishment of equivalent mass dynamics model of the globoid indexing cam mechanism,the force condition is analyzed and the equation of six order modal natural frequency is deduced. Combining with the example,the modal analysis process and step of the globoid indexing cam mechanism are introduced,and the foundation for avoiding the resonance during the further design of globoid indexing cam mechanism is provided.
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发布时间：2022-10-20 - 摘要：In order to study the security and reliability of chain force transmission components of note-temperature steam flooding snubbing workover machine lifting operating system,the analysis is carried out by using the finite element software,the distribution of the chain static strength stress is accurately simulated,the result of chain the maximum equivalent stress is less than the yield limit of the material is obtained,and the contact portion of the pin and sleeve is easy to wear,when worn,the chain pitch increase,the service life will be reduced with the increasing of total length of the chain. On this basis,the computing and simulation analysis of the chain fatigue life are carried out,the results show that the structure of are fully satisfy the work requirements under the load conditions.
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发布时间：2022-10-20 - 摘要：The structural characteristics of a variety of new type of hydraulic torque converter damper system are analyzed,and the torsional vibration analysis models of the transmission system with different damper systems are built based on a vehicle drive train parameters. According to the models,the natural frequency of these systems are compared. And the forced vibration characteristics of the transmission with TD system,new TTD system and new Twin TD system are compared. The results show that,for this transmission system,the use of TTD style is better than TD system and the use of Twin TD type damper system can achieve even better damping effect. The study has a certain help to torque converter damper system design.
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发布时间：2022-10-20 - 摘要：The overall three- dimensional assembly models of harmonic gear drive with double- circular- arc tooth profile and elliptical wave generator is established,then,the finite element analysis of the assembly model is carried out. Some improvements of the flexspline structure including fillet radius on flexible gear tooth and cut on smooth cylindrical outer surface of the flexible wheel is carried out on the basic structure,on The stress distribution and stress concentration of the flexspline are compared and analyzed. And the variation condition of the flexspline stress with the size of gear tooth fillet radius and the cut into the depth of arc of e flexible wheel smooth cylindrical outer surface is analyzed.
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发布时间：2022-10-20 - 摘要：In order to improve the reliability of model design,a certain type of excavator driving axle housing is regarded as the research object,the reliability interference principle is used to establish a reliable model of drive axle housing,the axle housing model size parameters are regarded as random variables,the stress and strain change rule and parameters sensitivity variation of axle housing model are studied.
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发布时间：2022-10-20 - 摘要：A kind of rod drive mechanism with two degrees of freedom and integrating lifting and moving is introduced for logistics electric vehicles,which can be able to complete the lifting and translation action. When the goods and the top shelf are not in the same plane or exist a intermediate gap,need to adjust the top shelf to reach a suitable location to transport goods conveniently. The kinematics description of lifting and translation drive mechanism is carried out from two aspects of positive solutions and inverse solution,and the calculation and analysis of work space is carried out. By using the Solid Works,the three- dimensional model of the lifting and translation drive mechanism is established and the simulation and analysis of its top shelf motion trajectory is carried out by using Matlab. Through the simulation results,the correctness of the derivation formula is verified,a theoretical foundation for the further research of lifting and translational mechanism is provided.
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发布时间：2022-10-20 - 摘要：At present,there is little special research on transmission on- line test bench,the equipment also had a lot of problems,such as the volume is too large,the high noise,the demand for manual operation on type switching etc. To counter these problems,focusing on the test bench structure optimization,noise control,the choice of the clutch,automation implementation and spindle box docking precision are studied. A new type of transmission on- line test- bench with small volume,high degree of automation,stable operation is developed. Experimental results show that,this new type test- bench can meet the requirement of application.
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发布时间：2022-10-20 - 摘要：In order to compile the load spectrum for dynamic characteristic and fatigue life test of wind turbine gear transmission system,the external random wind load is obtained on the basis of simulating reality wind speed and aerodynamics theory,and by using the rain- flow counting method and mathematical statistics method,the statistic and analysis of the input random wind load data is carried out. The relationship between the magnitude and the occurrence frequency of load and the probability distribution are obtained based on the fluctuation center method,and the eight levels test load spectrum for wind turbine transmission system is compiled.The randomness of wind speed and the bench testing are combined to make the results more in line with the actual,and a test foundation for precisely evaluate the dynamic characteristic and fatigue reliability of gear transmission system of wind turbine is provided.
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发布时间：2022-10-20 - 摘要：The bending fatigue strength of gear is an important indicator for gear performance,and it is an effective method to obtain the bending strength according to the test procedure. The test of the single- tooth bending fatigue strength of 20 Cr Mo H carburized gear is discussed. The test method of pulse load in single-tooth and the group method is used in the experiment and the bending fatigue strength test of gear tooth at 5classes of constant stress levels is carried out on the electromagnetic resonance testing machine. By applying planar section method and broken- line section method,the root stress of gear teeth under different load levers is calculated. The macro morphology of fatigue fracture of gear test specimens is analyzed. The result shows that it is more actual to determine the risk position with broken- line section method. It provides a new approach for evaluating the gear bending fatigue strength.
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发布时间：2022-10-20 - 摘要：The vibration data from defective gearboxes generally exhibit non- stationary and nonlinear property. As a result,it seems hard to effectively monitor the running status of gearbox by using the conventional time domain statistical parameters method which is based on stationary and linear theory. In order to solve this problem,the method of time series statistical linguistic analysis is adopted to examine gearbox vibration data and a novel method for gearbox condition monitoring based on time series statistical linguistic analysis is proposed. Firstly,an original series is mapped into a word- occurrence- frequency series,afterwards,a correlation coefficient of two word- occurrence- frequency series for the initial condition and another condition is used as a characteristic parameter for detecting a change of gearbox conditions. Finally,the proposed method is applied to condition monitoring of a realistic gearbox. The results indicated that the proposed method can both effectively detect changes of gearbox conditions and unravel a natural evolutionary process of gearbox conditions.In addition,the proposed method has a clear advantage over the conventional time domain statistical parameters method in condition monitoring of gearbox.
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发布时间：2022-10-20 - 摘要：For the problem of the impact of the lubricant viscosity on the rear axle transmission efficiency,by using the adaptive neural- network fuzzy inference method,a five- dimensional transmission efficiency controller based on ANFIS structure is designed. By using the subtractive clustering method,a set of fuzzy rules with language property is generated adaptively. Through the training,the various parameters of the ANFIS controller are optimized. After the testing,the results show that the fuzzy controller can well predict the rear axle transmission efficiency of different types of lubricant at the different input speed and the input torque. According to the analysis of the surface map,when the rear axle load on the same condition,the lubricant which has the higher viscosity index has the greater contribution to the transmission efficiency. When the rear axle load is large,the effectiveness of the lubricant to the transmission efficiency is more apparent.
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发布时间：2022-10-20 - 摘要：When rolling element bearing occurred incipient fault,its vibration signal from bearing seat is usually very weak,and the hidden impulse components may be masked by machine noise or background noise,making it difficult to extract the fault features by frequency spectrum or envelope spectrum analysis. Through the method of minimum entropy deconvolution（ MED）,the signal to noise ratio can be improved,and the impulse components from fault signal can be highlighted. The MED method is applied to corresponding deconvolution filtering for three typical early fault signals from rolling element,outer race,and inner race. Then,through the amplitude spectrum and envelope demodulation analysis,the corresponding typical fault features of rolling element bearing are successfully extracted. The effectiveness and advantage of MED method in incipient fault diagnosis of rolling element bearing is verified by the application results.
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发布时间：2022-10-20 - 摘要：<正>二重集团（德阳）精衡传动设备有限公司（以下简称精衡公司）前身为二重齿轮分厂,目前为二重集团（德阳）重型装备股份有限公司下属的全资子公司,是中国二重专业从事机械传动设计与研发业务的主体,占地面积10万平方米,固定资产5.3亿元,拥有齿轮设计、制造人员600佘人。产品包括各种通用圆柱齿轮传动、锥齿轮传动、行星齿轮传动、蜗轮蜗杆传动以及风机齿轮箱、轧机大型主减速机、水泥磨主减速机、各种规格锁紧盘、SWC\SWZ\SWP型十字万向接轴、鼓形齿
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发布时间：2022-10-20
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