摘要:The orthogonal experiment analysis of the surface roughness of grinding toothof face gear is carried out. The regression model of grinding wheel speed,feed rate and grinding depth is established by using multivariate nonlinear regression analysis method. The effect status of grinding wheel speed,feed speed and grinding depth on the face gear roughness are analyzed. The mathematical model of roughness about grinding wheel speed,feed speed and grinding depth is established. At last,according to the mathematical model of the single factor experimental data to carry on the comparison between measured and predicted,it is showed that the maximum error of the predicted value and the actual measured value is 11. 13%.The result shows that the relative error is not big,the accuracy of the model is improved.
摘要:Aiming at the selection of parameter of the cycloid bevel gear cutter,the influence of radial correction of cutter on the tooth surface contact is studied. The mathematical model of cycloid bevel gears is established based on the cutter head and the formation principles of production gears. The contact analysis of different curvature tooth surface is carried out. Through example analysis,the impact of the correction of cutter radius on the relative principal curvature on meshing reference point is researched. The TCA program is written,and the teeth surface contact patterns of the different corrections of the tangential radius of the cutter head is got. Through the three-dimensional software,the three-dimensional model of big and small gear is established and the virtual assembly is carried out. The instantaneous contact oval is obtained by the determinate interference on the reference point. The rule that length of contact area is shorter with the increase of cutter radius correction is obtained by contrastive and quantitative analysis. The reference for the design and calculation of the parameter of the cycloid bevel gear cutter is provided.
关键词:Cycloid bevel gear;Cutter radial;Correction;Normal curvature;Contact area
摘要:RV reducer is used in robot as a high precision speed reducer and its allowable transmission rotation angle error is less than 1’,so,in the process of manufacturing and assembling,there are many factors which influence the transmission accuracy of RV reducer seriously. The cycloid gear,crankshaft,output mechanism are important transmission components in the second reduction part,their original errors result in the inaccuracy of the whole machine. Through establishing a transmission four bar mechanism model,the relationship between the three components is expressed,and the direct relationship between input angle and output angle of the second reduction part is established. Through analyzing the four bar model,the effect rules of error on the transmission accuracy is got,the design standard of deviation is established and then error control method is explored,the whole work can play a guiding role in manufacturing and assembling process.
摘要:The structure and working principle of a new type of non-circular planetary gear hydraulic motor are introduced. The pitch curve and tooth profile of each gear within non-circular planetary gear system are programmed. A torsional vibration model is built from the dynamic performance of non-circular planetary gear system. In the model,the time-varying meshing stiffness,meshing phase and backlash of the meshing gear pairs are considered. The dynamics differential equations are solved by using Runge-Kutta method. Taking the 6 8 elliptical planetary gear system as example,the time domain response of gear system is obtained and the influence of the backlash on the dynamic characteristic of the system is analyzed,a theoretical basis for vibration analysis of non-circular gear motor is provided.
摘要:To study the oil film bearing capacity of wet clutch friction disk at initial separation state,the bearing capacity model at fixed friction gap is built. Using finite element method,the oil film pressure distribution in a friction pair is calculated,and comparative analysis with the oil film bearing capacity of radial groove friction components and non-groove ones is performed. Through simulation calculation of the oil bearing capacity of different friction disk structural parameters,the effect of groove depth,number and proportion on oil film bearing capacity is studied. The reasonable structural parameters are obtained to improve the bearing capacity of oil film as theoretical basis for the structure design of friction disk.
摘要:A six degree of freedom 4-PRP+3-UPS&PU redundant hybrid machine tool is proposed,and the statics and static stiffness of the machine tool is studied. Firstly,based on the force Jacobi matrix,the static equilibrium equation is presented,and the mapping matrix between the external load and the driving force and the binding force of the branch is solved. Secondly,the binding screw provided by each drive branch and constraint branch is analyzed,the elastic deformation of each rod under the action of the constraint screw is calculated. Finally,the stiffness model of the mechanism is established,and the elastic deformation of each branch is superposed,and then the overall flexibility and stiffness matrix of the mechanism are obtained. Combined with numerical examples,the MATLAB software is used to calculate the curves of the elastic deformation of each driving and moving platform with the length of the drive rod.
摘要:In order to realize chamfering tooth crest for spiral bevel gear efficiently,the feasibility of chamfering method with spherical cutter and machining center is researched. The solid models of gear and cutter are established,the initial values of cutting parameters are obtained by collision analysis between gear and cutter. A quantitative measuring method for shape error is proposed in order to satisfy shape accuracy requirement of tooth crest. The cutting parameters of chamfering are optimized aiming to minimize shape error. Cutting models of machining centers are established and cutting processes simulation are preformed,the results show that chamfering tooth crest for spiral bevel gear on 3-axis machining center is feasible. Cutting positions on spherical cutter can be controlled by redundant degree of freedom of movement if 4-axis or 5-axis machining center is available. When the segment of cutter which do not contact with the gear is removed,spherical cutter can be simplified to disk-shaped cutter which has longer circumference and slower wear speed.
摘要:During the meshing process of line gear,the normal side gap affects the transition from the positive to the reverse. Based on the space curve meshing theory,the spiral surface gears which can suit the positive and reverse transmission is researched. Taking the spiral line as the center line,the curved surface equation is studied,the driving surface is constructed. The positive and negative switching contact lines on the driven surface are analyzed. According to the positive and negative transfer line,the rectangular section is constructed,which can include the circular cross section of the driving surface. The curved surface equation is studied for constructing the driven surface. The kinematic performance of this kind of gear is studied. The results show that the gear pairs constructed by this method can fully transition without the large normal side gap,and meet the needs of the transmission.
关键词:Line gear;Space curve meshing theory;Normal gap
摘要:In order to reveal the nonlinear dynamics behavior of the three stage planetary transmission system of the shield driven cutter head,a pure torsional coupled nonlinear dynamics model is established for the number of planets,the gap between the teeth and the dynamic loads. The relative displacement between the various parts of the meshing point is derived,the system differential equation is established,the coordinate transformation of differential equations,and the non dimensional treatment is carried out. Then based on the dimensionless differential equations of four orders variable step Runge Kutta method. The transmission mechanism of the phase diagram,Poincare diagram are got,by changing the amplitude of excitation and the meshing stiffness,the influence of parameter variation on the nonlinear characteristics of the system is analyzed. The results show that with the increase of the amplitude of excitation,the system enters the two periodic state of the system by the steady state of the single cycle,and then enters the chaotic motion through the multi period motion. With the increase of the meshing stiffness,the system is in a state of multi periodic motion,and the system is stable in a single period. With increasing the meshing stiffness of ks3,reducing the excitation amplitude,the stability of the system can be improved.
摘要:Taking the dual clutch transmission as analysis object,a three-state dynamics model is built.The theoretical expressions of the shifting jerk of each states during the shifting process also are deduced. Considering the circulating power and the order of the operations of two clutches,the effects of above two factors on the shift jerk during the shifting process is analyzed detailedly. A control strategy of clutches basing on the speed adjustment of engine for dual clutch transmission is proposed. After that,a simulation model is built based on Matlab/Simulink platform. The result of the simulation shows that the control strategy coming from the theory can reduce the shift jerk effectively.
摘要:Taking the roller-type overrunning clutch as study object,based on the contact theory of Hertz,the contact stress between the key driving parts of the roller overrunning clutch is analyzed and studied.First,by analyzing the two common mechanical models of the overrunning clutch,the positive pressure P between the corresponding contact pair is obtained and then the Hertz stress value is calculated. Then,the application conditions of two mechanical methods are put forward through combining the contact optimization theory of Hertz. Besides,several parameters,such as contact stress,sliding distance that can reflect the contact characteristics of contact pair are obtained with the application of the finite element analysis software ANSYS,which actually verifies the adaptive conditions of two mechanical methods. The research results indicate that mechanical analysis method,which takes the coefficient of friction into consideration,is much more appropriate to the theoretical calculation,and the idealized line contact analysis model is suitable for the actual working condition,which provides a solid theoretical foundation for further understanding of the overrunning clutch operating characteristics and follow-up optimization design.
摘要:In order to study the influence of different structural forms of counterweight crank on the dynamic balance of crank-group mechanism,the dynamic balance conditions is proposed based on the mass moment substitution method and moment of momentum substitution method and the considering the application of this mechanism in tobacco packaging machine,the three virtual prototyping simulation model of six crank-group mechanism with different structural forms of crank are established. The simulation results show that fan-shaped crank,which has better dynamic balance effect than rectangular crank and triangle crank,is the best suited as the counterweight crank structure. It has important reference value and guiding significance for the design and optimization of physical prototype of crank-group mechanism in the future.
关键词:Dynamic balance condition;Six crank-group driving mechanism;Structure of crank;Adams;Dynamics simulation
摘要:The elastic plastic deformation of the tooth contact deformation area is an important factor which influences the concave error of shaving teeth. The application of Hertz theory to establish the shaving process contact deformation area in local coordinate system,the elastic plastic stress analysis model is constructed,the contact deformation region of the elastic and plastic stress of shaving is analyzed,the calculation formula and the plastic deformation stress calculation formula of the residual stress in contact area degeneration the elastic is put forward,the elastic limit yield stress value of shaving process contact deformation region is got,and this value as a criterion,as distinguished by the deformation area of contact gear elastic deformation and plastic deformation theory of boundary value,a method for quantitative analysis by the property of deformation of elastic-plastic deformation area of contact shaving gear is provided.
关键词:Mid-concave error of gear shaving;Contact deformation;Plastic stress;Elastic stress;Stress calculation
摘要:Based on the strength and modal analysis,the lightweight design of gearbox housing is carried out by using the topological optimization method. Under the condition of meet the reliability of the gearbox,the housing weight is reduced about 15% after structural optimization. The rationality of housing improvement is verified through the contrast analysis on the reducer housing performance before and after optimization.
摘要:In order to realize ankle joint auxiliary rehabilitation,a kind of auxiliary device for ankle joint rehabilitation based on center ball pair is developed. The device adopts the center ball pair as the support,and 3S’PS’ branch chain as drive system. The rehabilitation device can form the three-dimensional motions of the working platform,which can realize auxiliary rehabilitation for ankle joint. The configuration of the device is introduced in detail,and movement process for the working platform to realize any posture is analyzed for the device. The calculation formulas of displacement,velocity and acceleration are deduced. On the basis of this,the concrete examples of motion analysis for device satisfying the motion constraint condition are given respectively,the basis for the design of the device control system is provided. The research process provide a reference for the motion analysis of similar structures.
摘要:The kinematical equation of man-machine exoskeletons is established based on differential geometry homogeneous coordinates equation,according to the lower limb motion parameters,the boundary conditions are got,and then the motion trajectory of ankle is drawn by using the Matlab. In the face of the human lower limb exoskeleton and lower limb movement in the presence of interference problems,the equations of shortest distance of noncoplanar lines are established,and the equations are solved according to the condition that the shortest distance between lower limb exoskeleton thigh and human thigh is greater than the human thigh muscle,the relation of the distance of rotary axial between human lower limbs and lower limb exoskeleton is obtained. Based on the theory above,the design of multi-joint and low-resistance lower limb exoskeletons is finished.
摘要:In order to solve the problem of single function,poor human-machine interaction of the most wheelchair products on the market. A kind of multi-function wheelchair is designed according to ergonomics principle and interaction design method. The wheelchair could meet the needs of special human with the functions of obstacles crossing,automatic obstacle avoidance,standing deformation,auxiliary rehabilitation treatment. The test results show that the human-machine interaction of the wheelchair is strong compared to the similar products. It can improve the quality of life of the disabled patients.
摘要:The kinematics simulation analysis and improvement design of transplanting mechanism are conducted based on virtual prototyping technology. Through using Pro/E,the 3D model of the transplanting mechanism with elliptic gear is established,and then transferred into MSC. ADAMS software for kinematics simulation analysis. The simulation result shows that there are several obvious fluctuations in the speed curves of seedling claw point in the post-processing. This indicated that there is sudden change about the velocity,which could weaken the accuracy of the transplanting position and reduce the work stability of the transplanting mechanism. Through analysis,the cam design is not reasonable in the compensation mechanism. The cam of compensation mechanism is improved,and then the simulation analysis is reconducted. Through the improvement of transplanting mechanism,the fluctuations in the speed curves of seedling claw point are less than before,which could increase the accuracy of planting and the work stability of the transplanting mechanism,as well as prolong the service life of the gears.
摘要:The initial crack along the circumferential extension model of spinning pulley is established by using workbench based on the theory of linear elastic fracture mechanics,and the stress intensity factors of the crack front are calculated. The conclusion is drawn that the type of cracked in spinning pulleys is opening crack. Then,the different crack growth models of spinning pulley are established,the stress intensity factors of crack front and the amplitude ΔK of stress intensity factor are calculated. According to Paris formula and the curve of ΔK-a,the residual life of fatigue crack growth in the spinning pulley is calculated. The method provides a new way of calculating residual life of fatigue crack growth,with positive reference value for the safety design in the spinning pulley.
关键词:Spinning pulley;Stress intensity factor;Residual life of fatigue crack growth
摘要:A self-locking clamping device is designed,and the Solid Works software is used to carry out the 3D modeling of this gripper. The mathematical model of the offset slider rocker mechanism is established.Then,by using the software of MATLAB,the structure of the gripper is optimized,so that its stroke of the slider is minimum,while the maximum open angle is reasonable and its structure without interference. Finally,by using the ADAMS software,the dynamics simulation is carried out,and the result of calculation and verification meets the requirements.
摘要:The Positive-continous-engagement( PCE) overrunning clutch is the key component in helicopter transmission system. With wearing happened both in the high-speed differential speed and gripping process that lead to the change of the working condition of PCE overrunning clutch. The sprag flip and the sprag pop-in and out caused by wearing is the main failure mode of the clutch. The grip friction angle condition is derived,by establishing the dynamic model of the clutch,the reason of the sprag pop-in and out phenomenon and its influences on the clutch is analyzed. Based on the result,both the excess of initial engage angle and the increase of the engage angle caused by clutch wear will lead to the sprag Pop-in and out. The result could be used in the fault diagnosis of helicopter transmission system.
关键词:Overrunning clutch;Engage angle;Sprag flip;Sprag pop-in and out
摘要:The inlet gearbox spiral bevel gear of aircraft turbofan engine may result in insufficient of gear vibration margin because of the limitation of structure integration. The numerical analysis and test research of the dynamic stress of spiral bevel gear are carried out. The simulation analysis of bevel gear includes modal and frequency response analysis,the vibration rules of bevel gear is studied. The dynamic stress of bevel gear under working condition is got by using the method of strain gauge in test. The result show that theoretical analysis fits well with experimental results. The methods of dynamic stress calculation and experimental test are feasible.
摘要:Aiming at the required characteristic such as long-stroke and low-velocity of the existing pumping unit,on the basis of analyzing the advantages and disadvantages of the traditional pumping units,the planetary gear train of non-circular gear are applied on the pumping unit reversing device. The structure of two kinds of reversing devices are analyzed and compared,and ADAMS simulation software is used to analyze the kinematics simulation. The angular,angular velocity and angular acceleration of two kinds of mechanism are obtained respectively. Through the comparative analysis,the conclusion that the two pairs of circular gears and two pairs of non-circular gear combination structure has more advantages than four pairs of non-circular gear structure are obtained.
摘要:Based on dynamics simulation software,the dynamics analysis of the slider-crank mechanism with clearance joint is carried out and the effect of joint with different clearance size under dry contact and non-friction conditions on dynamic response of slider-crank mechanism is researched. A slider-crank mechanism test rig is built,through experimental,the effect of joint with different clearance size under dry contact and fully lubricated conditions on dynamic response of slider-crank mechanism is researched. The studies show that joint with clearance lubricated or not,clearance size and speed have an impact on the dynamic response of slider-crack mechanism.
摘要:Aiming at the weak abnormal sound of the new transmission products in the specific speed range of gear,the nonlinear of the dynamic parameter sample entropy is used to extract the operating characteristics of the transmission under different gears. The influence of different parameters on the sample entropy extraction is researched. The appropriate parameters are selected to calculate the sample entropy. In this parameter,the sample entropy and approximate entropy of the normal gear and fault gear are analyzed. The results show that with the input shaft rotational speed increasing,the sample entropy of the normal gear changes little,but the sample entropy of the fault gear decreases. And sample entropy compared to approximate entropy can be more effective extraction of transmission gear characteristics. And the order envelope analysis is carried out for the failure of the fourth gear of a transmission with abnormal sample entropy,and the fault diagnosis of transmission gear is realized.
摘要:For cable drive with different rope number,the transmission error prediction method is explored based on BP neural network. A prediction model for transmission error is developed by a double hidden layer BP neural network. The input parameters of the model are preload,load and rotation angle respectively. The output parameter is the transmission error. The transmission errors under different conditions are tested firstly.And then the results are divided to training samples and prediction samples,which are used to train the network and verify the performance of the trained network. The experiment results show that the transmission error increases with the increase of rotation angle at the range of 0 to 180. And the biggest value is 5. 6 mrad,the prediction error is less than 0. 294 mrad. In conclusion,the double hidden layer BP neural network is effective to predict transmission error.
摘要:Taking the double arc groove hydro-viscous drive which uses fiction plate as the research object,the Fluent fluid analysis software is used to calculate the fluid cavitation effect of friction pair,the influence of rotation speed and fluid viscosity on cavitation zone is analyzed,as well as before and after oil film bearing capacity changes,the results show that the shape of cavitation zone is like vertical long strip,the cavitation starts from the outside radius direction,and becomes more significant along the radius increasing direction. Decreasing rotation speed or viscosity can slow down cavitation speed effectively. The deeper and more grooves,the smaller the gas bearing ratio,when the groove depth is more than 0. 3 mm and the groove number is more than 45 are determined as the best. The cavitation effect influences the performance of friction pairs,and decreases the oil bearing capacity,the effect of cavitation on the oil film bearing capacity will be more significant with the increase of groove depth and decrease of groove numbers.
关键词:Hydro-viscous drive;Fluent;Cavitation effect;Oil film bearing capacity
摘要:The transmission efficiency of manual transmission and its effect factors are studied by using experimental method. A test bench of transmission efficiency is built,a testing sample is manufactured,and the transmission efficiency experiment is carried out. The test results show that when load torque remain constant,the transmission efficiency increases with the increasing of input speed,eventually reaches the maximum,then decreases gradually. Given the same input speed and load torque,the transmission efficiency is highest when its gearshift is switched to the fourth gear. When the input speed remain constant,the transmission efficiency increases with the increasing of load torque. When the viscosity-temperature characteristics of gear lubricant is improved by adopting multistage gear oil or synthetic gear oil,the comprehensive efficiency can be increased by 0. 62% and 0. 96% respectively. When open-type bearings are adopted to reduce the friction loss,the comprehensive efficiency can be increased by 0. 52%.
摘要:Concerning the fatigue failure of the gear reducer for the large scale recreation facilities-large pendulum,the fatigue life of the non-uniformly distributed planetary gear of the large pendulum under cases of non-destructive and crack is studied. Some digitized models of planetary gear train with different cracks are built. Based on the theory of fracture mechanics,the relationship between the intensity factors of crack stress and the fatigue life of the gear is analyzed. By the combined using of ANSYS Workbench and nCode DesignLife,the stress variation and fatigue life of gear is obtained,and thus to verify whether the design could meet the mechanical design requirements and acquire the influence of the crack gear on the fatigue life of reducer.The results can be applied to structure optimization of reducer gear,manufacture and detection under operation.
摘要:As the research object,the finite element model of a certain type of RV reducer is established in a finite software,considering the meshing stiffness of planetary gears and cycloid gears,elasticity of components and the bearing stiffness. Based on the isometric and shift modification to the cycloid gears,the torsional stiffness of the RV reducer with deformation caused by the meshing force is calculated. At the same time,compare with the data obtained from experiments of torsional stiffness,it is concluded that the maximum torsional stiffness is 278. 8 N·m/( ’),and the minimum torsional stiffness is 247. 1 N·m/( ’),but the average value of torsional stiffness is larger than the experimental value by 10. 85%,the hysteresis is smaller than that by8. 9%. It shows that the finite element method is can be used for reference to simulate and analyze the torsional stiffness and the hysteresis.
关键词:RV reducer;Torsional stiffness;Finite element method;APDL language
摘要:Taking a type of transmission as the research object,the axis gear system dynamics model is set up,and the dynamic time history and load spectrum of the transmission shell under the working condition are obtained. Based on dynamic load incentive,the finite element simulation model of the boundary element is established,the vibration acceleration and near sound field radiated noise of the shell surface are calculated. The gearbox shell vibration and radiated noise test platform is built,the shell surface vibration acceleration value and the acoustic noise spectrum of nearly one meter position under the same condition are test,and compared with the simulation results,the validity of the finite element model and the boundary element model is verified. Finally,the different local gearbox shell is optimized,through the simulation calculation,the results show that the optimized gearbox shell vibration amplitude and radiated noise is better inhibition.
摘要:Due to the manufacturing process and technical conditions limit in engineering,there has never been very good solution to the problem of gear rattle. Based on analyzing the structure and working principle of the novel compound power-split device,combined with the gear rattle mechanism,a control method for weakened against the gear rattle of the system is proposed. Firstly,the two driven wheel gear tapping torque area corresponding to the certain state of engine is obtained by calibration,controlling the two motors to avoid driven wheel running in the area through the kinematics relationship of system on the basis of does not affect the driving intention and fuel consumption. The simulation model of the vehicle and control is established,the simulation shows that the strategy can achieve the desired effect and only has very small influence on the vehicle after increase the strategy. The real vehicle experiment results which use the speech intelligibility evaluation show that the control strategy can weaken the gear rattle and improve the vehicle ride comfort greatly.
摘要:The radial deformation is one of the important parameters that affect meshing characteristic and the life of flexspline in harmonic reducer. Based on envelope meshing theory of harmonic drive,the influence of radial deformation on meshing characteristic of harmonic drive is analyzed. The finite element method is used to obtain the stress distribution of the flexspline. The results show that the radial deformation has significant influence on the meshing track,the radial deformation of the flexspline,the tangential deformation,the rotation angle in normal direction,the bending stress and the tangential stress of the flexspline. The result of the flexspline stress distribution from theoretical calculation has good consistent with the result from finite element analysis.This can provide some reference for the choosing of reasonable radial deformation to improve meshing performance and life of flexspline.
摘要:In order to improve spiral bevel gear machining efficiency and reduce installing times,the method of machining spiral bevel gear by double-spindle cutter head is proposed. Firstly,the double-spindle cutter head machine model is established,and the NC machining motion is analyzed. Secondly,the machine motion axis coordinate is calculated based on motion equivalent relation. On basis of these works,in order to ensure tooth flank machining precision,the process of tooth flank errors modification for double-spindle cutter head machining is studied. Finally,the machining and measuring experiments are conducted on a pair of 17/28 gears,and the results verifies that the machining method by double-spindle cutter head is effective.
摘要:To effectively identify the bearing fault position and the degree of damage,a model of adaptive cuckoo search algorithm combined with BP neural network( ACSBP) is proposed. In the ACS algorithm,the Levy flight strategy is eliminated to reduce the randomness of the search process. Simultaneously,in order to reflect the universality for different optimization problems,the updating of step size is implemented by the fitness function value,which did not need to be initialized. Furthermore,the dynamic adjustment method of discovery probability is adopted to improve the optimization accuracy and convergence rate. Based on these approaches,the model of bearing fault diagnosis is established. The diagnostic results show that the ACSBP algorithm has stronger fault tolerance compared with CSBP and PSOBP models,and can effectively improve the accuracy of bearing fault diagnosis.
摘要:Aiming at the problem that the incipient fault feature of rolling bearing is easily submerged in the environmental noise and is difficult to extract,an incipient fault diagnosis method combined minimum entropy deconvolution( MED) denoise with variational mode decomposition( VMD) is proposed. Firstly,the bearing vibration signal is denoised by using MED with kurtosis as maximization criteria. Then,the processed signal is decomposed into several components through VMD which is a new high precision multi-component decomposition method. At last,the bearing fault is diagnosed by analyzing fault frequency in the envelope spectrum of the maximal kurtosis component. The experimental signal analysis results show the validity of the proposed method.
摘要:Aiming at diagnosing the fault of roller bearing accurately,a method based on Local Characteristic-scale Decomposition( LCD) and Base-scale Entropy( BE) is proposed. Firstly,the rationality of using the BE to extract the fault information of the bearing vibration signal is analyzed,according to the parameter selection problem of BE,a method based on phase space reconstruction theory is proposed,and the delay time and embedding dimension are selected. Secondly,in order to extract the fault feature fully,a kind of adaptive multi-scale BE based on LCD is proposed. Finally,the denoising signal and the useful components of LCD are selected to compute the BEs as the feature vector of support vector machine( SVM) to fault diagnosis. The analysis of the bearing fault data shows that the method can identify the normal,inner ring fault,outer ring fault and rolling fault effectively.
关键词:Local characteristic-scale decomposition;Base-scale entropy;Phase space reconstruction;Multi-scale;Support vector machine
摘要:Aiming at the disadvantage that conventional structuring element for the mathematical morphological can’t adjust its height adaptively,the quantum theory is employed to propose compound quantum-inspired structuring element for erosion( CQSEE),which is used for extracting fault information in vibration signal from mechanical transmission system. Since CQSEE utilizes quantum theory to depict noise and fault information,it maturely considers different characteristics of noise and fault information during computational process,which realizes the goal of adjusting height of structuring element dynamically. Then CQSEE is applied to analyze the fault signal of rolling element bearing. The result reveals that CQSSE improves the morphological ability of erosion operator.
关键词:Quantum theory;Mathematical morphology;Fault diagnosis;Signal processing;Structuring element
摘要:According to the problem of difficult to identify rolling bearing fault,the diagnosis method which based on Improved CEEMDAN and Teager energy operator is put forward. First of all,the fault vibration signal measured by sensor is decomposed by using the method of Improved CEEMDAN and a number of intrinsic mode function( IMF) is got,and the interference of noise components is weakened and the fault feature is enhanced by this method. Then,the Teager energy operator of the correlation modal signal is calculated and the envelope spectrum analysis is carried out. At last,the fault diagnosis is realized by the frequency components.The experimental results show that the diagnosis method based on the Improved CEEMDAN and Teager energy operator can effectively extract the weak characteristic information of the bearing fault signal. The method has certain practical value.