最新刊期
期 10 ， 2015
- 摘要：The crank- group driving mechanism is a kind of underactuated mechanism with redundant characteristics. Based on the topological theory,taking the typical structures of the crank- group driving mechanism（ the single driven crank driving mechanism and the double driven crank driving mechanism） as examples,a preliminary study and exploration of its topological structure is conducted by using kinematic chain and the matrix. To solve the mechanism problems through the topological structure theory,the organic integration of topology and mechanism is achieved. And there’s no doubt that it’s of great importance for the study and the development of interdisciplinary.
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发布时间：2022-10-20 - 摘要：Aiming at the problem of the vibration noise in the braking process of wet multi- disc brake,the damping and stiffness between the brake disc friction plate and the steel disk are introduced based on the consideration of the small relative displacement of the brake disc and the friction lining due to time delay,otherwise,the contact friction relations of braking component and their effect also take into consideration. By using the nonlinear contact kinematics,the analysis model of the wet brake noise is proposed and the accuracy of this model is verified by using the complex modal finite element simulation analysis. The results show that this kind of model can predict the brake noise more accurately during braking,and the research has vital importance to practical engineering.
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发布时间：2022-10-20 - 摘要：A translational- rotational- coupling dynamics model for a NGW double helical planetary gear train（ DHPGT） is developed to investigate the free vibration characteristics. Based on the established model,the differential equations of motion of the system are derived. Through the solution of the system eigenvalue problem,the natural frequency and vibration mode are acquired corresponding. According to the characteristics of transmission system,the vibration modes of a DHPGT can be classified into three categories,i. e.,the central components axial torsional vibration mode,the central components translational mode and the planet wheel vibration mode. Based on the loci veering / crossing principle,the influences of loci veering and loci crossing on the transmission characteristic are analyzed from the perspective of modal strain energy and vibration modes.The simulation results demonstrate that vibration modes and modal energy exchange abruptly when a loci crossing occurs,while vibration modes and modal energy change step- by- step but do not exchange when a loci veering occurs. The conclusions are then verified by numerical simulation of an example system. The present research can accurately forecast natural frequency and the point of modal and modal energy mutation,a fundamental theoretical basis for the parameter optimization,noise reduction and vibration suppression for the DHPGT is provided.
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发布时间：2022-10-20 - 摘要：Taking the varying- coefficient- shift- modification gear transmission system as study object,the dynamic characteristics are studied. The dynamics simulation model of varying- coefficient- shift- modification gear transmission system is established based on the software of Matlab,Pro / E and ADAMS. The curves of changing contact force and vibration characteristic are obtained. The simulation results show that,the varying- coefficient- shift- modification gear has the characteristic transmission steady,contact force of gears and angular acceleration change regular. The vibration caused by the backlash of eccentric- involutes gears is effectively reduced,it has a strong application value in the practical engineering.
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发布时间：2022-10-20 - 摘要：Aiming at the problems that the flexspline of harmonic type gear pump could easily lead to tooth interference during the process of gear meshing,according to envelope theory,the mathematical model of tooth profile of flexible gear is established when conjugate involute profile of rigid gear is given. The numerical solution of tooth profile of flexible gear is got by using MATLAB,and the motion simulation of harmonic gear pump is simulated. The results show that a problem of interference is solved by adjusting clearance of radial and tooth.
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发布时间：2022-10-20 - 摘要：For the problem that the finite element simulation analysis of temperature field of large rubber coupling of ships is difficult to convergence because of the large load,the large deformation of rubber piece parts and the nonlinear characteristics of rubber materials,by using the decoupling method,combined with the node equivalence method,the finite element mathematical mode of the rubber material thermal analysis is established theoretically. With some kind of diaphragm rubber couplings as an example,the thermal of its rubber element is analyzed,the steady temperature distribution and transient temperature field curve are got. Studying of the results by using least square method,finds that the relationship of the maximum temperature rise with load torque is a parabola,and the relationship of the maximum temperature rise with load with load frequency is a linear. The simulation results and the experimental results that obtained through torsion test have a good consistency. The feasibility of this approach is proved,and it has the guiding significance for the actual work.
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发布时间：2022-10-20 - 摘要：In order to study the effect of joint clearance on the dynamic characteristic of the articulated mechanism,an improved nonlinear contact collision model is established. By modifying the contact collision parameters,the contact state of collision is accurately described. Then the model is incorporated into ADAMS for dynamics simulation. The effects of loading frequency,loading acceleration and clearance size on the dynamic response of an articulated mechanism are studied. Through the contrasts of simulation and experimental results,the reliability of the model is verified. Thus,a certain reference for the research of the dynamic characteristic of the articulated mechanism with joint clearance is provided.
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发布时间：2022-10-20 - 摘要：In order to solve the problem of belt drive system energy loss during belt critical gross slip state,the V belt system is regarded as research subjects,the calculation formula of mechanical property in pulley wrap angle region is deduced,when critical gross slip state,combined with the V belts basis of structural parameters,finally,the belt total pressure and total friction formulas during the critical gross slip state are got by theoretical value derivation. The results show that with the ratio of slip occurs state angle / wrap angle increases,the total pressure between the belt and pulley show a trend of first increase then decrease; when the friction coefficient is small,with the ratio of slip occurs state angle / wrap angle increases,the total friction of the belt as a whole show a downward trend,when the friction coefficient is large,the total friction belts in the overall show a trend of first increase then decrease; through the study of the mechanical property of belt drive system during critical gross slip state,which can provide important significance for the subsequent control of the belt drive slippage and improve transmission efficiency.
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发布时间：2022-10-20 - 摘要：The cycloidal gear has many drawbacks such as difficulty processing,higher cost,a special requirement on the center distance between engagement pair. Though the beveloid gear RV reducer,all above drawbacks are overcome,the aspect of large backlash and low transmission efficiency remained to be improved.Therefore,improving the structure of existing beveloid gear RV reducer is put forward,the involute gear pair of high- speed stage in existing RV reducer is replaced of beveloid gear pair to adjust the backlash into optimum state. Then,by taking effect factors of meshing efficiency such as meshing angle,cone angle and modification coefficient as the design variables,also with the goal of improving transmission efficiency,an optimization and analysis of the beveloid gear RV reducer is carried out. At last,comparing the transmission performance of the new beveloid gear RV reducer designed with the ordinary beveloid gear RV reducer,which illustrated the efficiency of the new RV reducer is superior to others.
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发布时间：2022-10-20 - 摘要：For the issues of heavy duty engineering vehicle wet brake poor stability during braking,the system stability degradation algorithm is introduced into the heavy wet brake stability evaluation system,the degradation data integration of the product components manufacturers and users are got by themselves,and the parameters of the leading role of the wet brake stability is determined based on sensitivity analysis. The stability evaluation accurate conclusion on design scheme in the initial design stage of wet brake is proposed and compared with the prototype test data. The results show that as the design of sensitive parameters information initial stability deviation and degradation information would take into consider,a heavy wet brake stability evaluation method is proposed based on the system stability degradation theory. Through this method,the efficiency of product design is greatly improved,the blindness of design is reduced,and play an important role in improving the production efficiency of the enterprise.
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发布时间：2022-10-20 - 摘要：The power shift mode of best performance,fuel economy and the comprehensive shift mode which considering both performance and fuel economy of the two- speed AMT are built. A double shift mode based on the parameters of average acceleration and the acceleration square root is designed by using fuzzy control theory. On the basis of Matlab / simulink platform,the carload,AMT and shift modes are established. By simulating the battery electric bus FDG6601 EVG,a comprehensive comparison analysis of the four shift modes are carried out,the result shows that the comprehensive shift mode and double shift mode can give consideration to the performance of power and economy while the double shift mode is much better in comprehensive performance,compared to the comprehensive shift mode,the energy consumption reduced by 11. 1%,0 50 km / h acceleration time reduced by 2. 48%.
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发布时间：2022-10-20 - 摘要：A quick calculation method of gear tooth deformation based on mechanics of materials,and calculation formulas for each deformation are analyzed and demonstrated. A modified gear tooth basic deformation Weber- Banaschck formula is proposed. The result coinciding with ISO is achieved. The characteristic and rule of gear tooth contact,bending,shear,compress and basic deformation and so on are analyzed with a gear tooth form factor without unit. A method to approximate gear deformation curve with parabolic which defined by minimum deformation δ0,deformation at right and left side δRand δL. It has a high accuracy and a basic for analyzing of gear transmission error changing and simple calculating of gear tooth modification curve is provided.
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发布时间：2022-10-20 - 摘要：In order to obtain the effects of size parameters on meshing performance of the main reduction gear in a car,the response parameters of gear meshing are obtained by using the explicit finite element method.The response surface model of meshing response parameters of thegear size parameters are established based on the Kriging model. The main reducing gear parameter optimization are carried out by using the NSGA- Ⅱ multi- objective optimization genetic algorithm in which the tooth root bending stress,tooth surface contact stress and volume of the gears are defined as objective function,the solution set of the gears parameters are obtained. The meshing stress level of main reduction gears decreased significantly after the optimization.
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发布时间：2022-10-20 - 摘要：According to the problem of the loading capacity is limited and the accidental injury is easy happened,a self- lock pole- climbing robot is designed based on self- lock principle. The structure scheme and working principle of the robot are introduced. The self- locking conditions and motion stability are analyzed. The carrying capacity of robot is calculated. The control method for the robot climbing on variable diameter pole is analyzed. The results show that the robot can climb variable diameter pole stably,which meets the requirements for telegraph pole aerial work.
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发布时间：2022-10-20 - 摘要：Taking the coupling dynamics modeling of spur gear pairs as the research object,considering the time- varying meshing stiffness of teeth and the friction between teeth,two models of different mesh stiffness of fault and intact gear are established. The two models time- varying meshing stiffness are calculated by the finite element method,the results show that the crack will reduce the meshing stiffness of gear,the greater the crack,the smaller the meshing stiffness. By using the Matlab,the dynamics differential equations of the model are solved,the angular velocity and angular acceleration simulation curve of the two kinds of fault and intact gear are got,the result is that the gear turning crack,angular velocity and angular acceleration of the driven produced obvious fluctuations,the calculation results are consistent with theoretical analysis.
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发布时间：2022-10-20 - 摘要：For the solution of the robotic workspace,on the basis of existing research methods,a new solution method which combines the advantage of Monte- Carlo method with Matlab simulation modeling capability is proposed. Based on Staubli TX60 L six axis serial robot,the workspace is respectively generated by using numerical method,the geometric mapping method and the proposed method,and comparison analysis is carried out,the results prove that this method need not to consider complex kinematics equation,and the accuracy high and computing speed fast.
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发布时间：2022-10-20 - 摘要：In order to investigate the influence of the straight bevel gear train on a robot joint,several methods of straight bevel gear modeling are compared in accuracy grade and operating convenience. And then the principle of the formation of spherical involute is chosen to build a straight bevel gear train geometry model accurately and parametrically with the use of Pro / E. Based on this model,its dynamics simulation and finite element analysis are carried out in ADAMS,Hyper Mesh and ABAQUS separately. The results show that the model is in conformity with theory and the accuracy of modeling and the feasibility of simulation are verified,a foundation for further study on the robot joint and other similar institutions is provided.
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发布时间：2022-10-20 - 摘要：The hydraulic flat torque converter is designed for the purpose of study on how the flatness ratio effect on the hydraulic performance. The flat torus new design method based on the ellipse is used. Four kinds of different flatness ratio hydraulic torque converter are designed. The internal flow field of the torque converter is simulated by CFD,and the distribution of the velocity and pressure of internal flow field is analyzed,and compared with the standard hydraulic torque converter,the influence of the flatness ratio of hydraulic torque converter on hydrodynamic performance is found out. With the flatness ratio decreased,the hydraulic performance of the hydraulic torque converter is getting downtrend.
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发布时间：2022-10-20 - 摘要：The main bearing of RV reducer is studied. Firstly,the contact stress and elastic deformation of bearing with different curvature radius coefficient are calculated by using the MATLAB. Secondly,the dynamics analysis of the contact force of ball and bearing inner and outer ring is carried out by using the impact function in ADAMS software. By using the method of analysis and comparison the ball bearing which has different radius curvature coefficient,among transient impact force,steady contact force and the distribution of contact force of the forward radius force. Through the comparison and analysis,the better radius curvature coefficient is selected for the RV reducer main bearing.
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发布时间：2022-10-20 - 摘要：By using the 3- Dimension tolerance analysis software CETOL 6σ,taking the gear backlash in the gear system as closed- loop,considering the actual assembly sequence and the standard normal distribution of the processing size of each part,the 3D dimension chain analysis is carried out,the size of the backlash is obtained,and comparing with the result of existing calculation method. Combining the result of contribution degree analysis,optimizing the tolerance and the backlash is taken as the input substitutes into the established one- dimensional dynamics model of gear to analyzing its dynamic response.
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发布时间：2022-10-20 - 摘要：For improving interchangeability of bearing product,the method of rolling bearing serializing design is researched under the environment of CREO. The parametric CAD model template of deep groove ball bearing 6208 is designed,and then the structural parameters edited of different specifications bearing and its model reconstruction are achieved on this basis. The data exchange and operation mode of the rolling bearing is established with DLL technology which used C + + language as development tool,and the interactive interface of the rolling bearing serialization design based on the CREO platform is successfully developed. Because of that,not only effectively enhance the flexibility of bearing product development,but also provides a technical basis for similar product serialization design and market transformation.
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发布时间：2022-10-20 - 摘要：The synchronous belt transmission noise mechanism is complicated,especially the air borne noise. Taking the double helical synchronous belt and straight tooth synchronous belt with identical end tooth profile as research object,the straight tooth pulley includes the flange and non- flange structure. The relationship between transmission noise and initial tension and rotational speed are derived. The frequency spectrum analysis demonstrates that the noise differentiation arisen by air borne noise. The result shows that the air borne noise is strengthened with dipole and quadrupole noise source due to the flange,the air borne noise is weaken by the sound pressure leakage of air piston. The relationship of air borne noise and relative parameters is quantified.
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发布时间：2022-10-20 - 摘要：Aiming at the problem of rolling bearing fault severity recognition,a fault severity recognition method of rolling bearing based on compensation distance evaluation technique（ CDET） and grey relational analysis（ GRA） is proposed. By utilizing the compensation distance evaluation technique to choose features sensitive to fault severity from the high dimensional feature set,and weights such sensitive features according to their sensitive degree. Then,by using the sensitive feature subset,a standard degradation pattern matrix is built,and the grey relational analysis is applied for fault severity recognition in accordance with correlation degree index. The results show that the proposed method can effectively recognize different rolling bearing fault severity,and at the same time,the calculation complexity is reduced.
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发布时间：2022-10-20 - 摘要：The chain used in embedded type stereo carport sustain the main weight during the process of lifting stereo carport. The chain plate is the main part of the chain,and lifting the carport repeatedly leads to fatigue failure. The traction mode of 28 A and 20 A,two types of the single and double row of chain are chosen,the chain plate model is established by using the ANSYS software,the force analysis is carried out and the fatigue analysis is carried out through the finite element software Workbench. By comparing the two kinds of force distribution regularity of the chain plate,the optimal chain mode is selected. And the more about life and fatigue failure about the chain can be known,which is convenient for maintenance and replacement of chain in timely.
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发布时间：2022-10-20 - 摘要：According to the problem of noise interference in the mechanical equipment fault signal acquisition,a novel mechanical equipment fault diagnosis method of wavelet shrinkage threshold based on Bayesian estimation combined with EMD is proposed. The fault signal denoising characteristics of different scales are considered in proposed method. The new threshold is suitable for the situation of noise distribution. The noise reduction can be gotten by improving the threshold function. The signal components decomposed and denoised by EMD is extracted with cross- correlation and kurtosis criterion to highlight the high- frequency resonance components,the blindness of IMF component selection is avoided. The results of analysis applied to simulated signal and the measured signal show that the equipment fault can be detected accurately.
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发布时间：2022-10-20 - 摘要：Aiming at the problem of system threshold of high- frequency oscillation often appear on gear system starting in the light load gear dynamic analysis simulation system,an method of eliminating the system oscillation caused by initial loading based on the dynamic relaxation is presented. Firstly,the gear system preloading dynamic relaxation process is analyzed. Furthermore,the key technology of dynamic relaxation method in the gear system dynamic simulation based on LS- DYNA platform is put forward. Finally,the effectiveness and better convergence of method for using in the in gear system dynamic simulation analysis are verified by comparing with the simulation results of traditional way of loading.
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发布时间：2022-10-20 -
Analysis of the Electromechanical Coupling Vibration of Belt Drive Mechanism when the Motor Starting
摘要：Taking the differential equation of the electromechanical coupling and bending and torsion nonlinear vibration of the belt drive mechanism which establishing according to the Lagrange- Maxwell equation as research object,by using the Runge Kutta method,the nonlinear characteristic of the electromechanical coupling system and the vibration characteristic in the state of the motor starting are analyzed,the phase diagram,time response,frequency spectrum and the axis trajectory are obtained. When the motor starting,the axis trajectory has apparent change,it shows that the motor is not stable. By phase diagram shows that the influence of motor on the torsional vibration is not very obvious.- 6
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发布时间：2022-10-20 - 摘要：The multiaxial helical gear transmission is widely used in helicopter for parallel operation. The dynamics model of the helical gear transmission is established for system inherent characteristic analysis,and the dynamic response is obtained. The influence of asymmetrical loads on helical gear dynamics characteristic is analyzed. The analysis shows that the inherent characteristic of the helical gear has good property because of the structural symmetry. When the input loads are symmetry,the motions of the two input gears are identical and certain modal responses are suppressed. The output gear only has rotational and axial vibrations. When the input loads are asymmetric,those suppressed vibrations will show up again and will be more remarkable as the degree of asymmetry gets greater.
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发布时间：2022-10-20 - 摘要：For safe physical human- robot interaction,a method of statics analysis on safe manipulator based on torque limiter is proposed. It is very important to analyze the maximum isotropic force and the maximum achievable force. After a series of derivation,the relationship and operation steps among the joint limit torque and the maximum isotropic force and the maximum achievable force are obtained. And the ratio of the maximum isotropic force and the maximum achievable force is proposed as a safety performance index applied in redundant manipulator kinematics to perform tasks effectively. Finally,through the MATLAB algorithm programming,the simplicity and effectiveness of the method steps are verified by numerical examples,which provide a control theoretical basis for manipulator architecture and configuration to calibrate torque limiter.
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发布时间：2022-10-20 - 摘要：In order to keeping the furthest symmetry of the blade upper and lower moving while the reciprocating cutter of double blade running continuously,the transmission mechanism motion mode of the double blade reciprocating cutter is researched analyzed. Firstly,the principle of realizing the reciprocating cutting of the transmission mechanism is analyzed,the space- filling model of the transmission mechanism is simplified to plane double four- bar linkage mechanism model. Secondly,through analyzing the plane double four- bar linkage simplified model of transmission mechanism and calculating with the mechanical principle knowledge of the four bar linkage,the operation conditions of the furthest symmetry are obtained and the operation conditions of the furthest symmetry are proved to be reasonable and proper by the Maple program operation and the motion simulation of ADAMS. Finally,the component size determination method are obtained by analyzing the effect of component size on the movement performance based on symmetry conditions when the movement performance is optimal.
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发布时间：2022-10-20 - 摘要：As to mode mixing problem of empirical mode decomposition（ EMD） and local mean decomposition（ LMD） when they are applied to field data decomposition,a new wind turbine fault diagnosis method based on variational mode decomposition（ VMD） is put forward,and then it is applied to the wind power drivetrain system for imbalance fault diagnosis. The result shows that VMD can effectively avoid the mode mixing phenomenon caused by noise and impulse. It has a good effect on the diagnosis of unbalanced fault.
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发布时间：2022-10-20 - 摘要：To improve the efficiency of harvester reel and improve the shortcomings of existing eccentric reel,a new device of gear- cam modular reel is presented. By a combination of gear and cam,through changing the reel speed in the rotation process and tine head vertically into the ear to improve reel efficiency. The main features of the device,the key parts of the design,including the cam profile design,mechanical analysis of the spindle and so on are described. By using MATLAB and Solid Works,a cam profile is designed,and by using ANSYS,the spindle statics analysis of the structure and vibration mode and natural frequency under dynamic load are got. By the design and analysis,the presented new reel is practicable.
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发布时间：2022-10-20 - 摘要：According to the working conditions of mine transport machinery,a reducer of bevel- cylindrical gear named JS75- 25 is developed. The key points for optimal design and the matters needing attention are given. According to the inspection specification of mining reducer,the type test of the prototype is carried out,the corresponding experimental data is gained. The data analysis of the heat balance under non- load,full load and the transmission efficiency of the gear reducer are carried out. The analytical results indicate that they have a high fitting precision in the heat balance and transmission efficiency perfectly matching exponential distribution curve,and so it can be used in a forecast of the correlative experimental data. According to the presented key points of design and experimental method,a basis for improving this kind of reducer is provided.
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发布时间：2022-10-20 - 摘要：In order to improve the work quality of rice transplanter,a planetary gear transplanting mechanism which gear pitch curve composed of circle and ellipse arc is designed. According to the mechanism kinematics model,the assistant analysis software is written. By the software analysis,the transplanting mechanism seedling claw trajectory is obtained and the trajectory is almond shaped,it is to the benefit for seedlings orthostatic. The mechanism meet the planting requirement.
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发布时间：2022-10-20 -
Application Status and Development Trend of Lightweight Technology of Crane Gear Transmission Device
摘要：In recent years,with the increase of new type gantry crane market application volume,the application of new type of transmission device of gantry crane is more and more attention to the main production enterprises,the situation and trend of new type of transmission device technology used in the crane is briefly introduced.- 4
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发布时间：2022-10-20 - 摘要：The frequency response analysis of gearbox housing of large- sized bridge crane is carried out under the excitation frequency,and the displacement response curves of every bearing bore on the housing and the greatest response position of the housing are obtained. The results show that when the meshing frequencies under the rated speed,the natural frequency of the housing can be avoided and it should not cause the resonance.
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发布时间：2022-10-20 - 摘要：Because of the complex structure of gear production,poor working conditions,high reliability requirements,and so on,the structure performance requirements for precision forging gear blanks become more stringent. Therefore,the metal flow line distribution state is gradually become an important indicator of car gear blanks performance test. The technological parameter and die structure have greatly effect on the direction of metal flow. The influence law of structure of the die and punch on metal flow line distribution state of car gear blanks is deeply analyzed by means of finite element simulation software DEFORM- 3D. The optimal technological parameter and mold structure size are determined. The actual production shows that the actual metal flow lines and product requirements are basically consistent. The method of pre- control optimization can effectively reduce the number of tests,reduce the production costs and increase the production efficiency. The important technical support for improvement of structure performance and mechanical behavior in mass precision forging of car gear blanks is provided.
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发布时间：2022-10-20 - 摘要：Taking a tractor gearbox transmission system as the research object,the deformation of transmission shaft and the dislocation of gear are analyzed based on ROMAX software. The transmission error curve and the meshing characteristic of modification gear are studied,and the optimal modification quantity is determined,and the mechanism and influencing factors of the gear vibration and noise are analyzed. After the bench test of modifying helical gear is carried out,the vibration characteristic of modification gear and unmodified gear are analyzed,and the correctness of gear modification effects is verified.
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发布时间：2022-10-20 - 摘要：The 3D finite element model of planet carrier of wind turbine speed- increase gearbox is built to calculate the stress- strain of planet carrier under unit static load. The fitting method of S- N curves of the planet carrier of wind turbine speed- increase gearbox parts is given based on the Germanischer Lloyd specifications（ GL2010）. The fatigue life analysis of the planet carrier of wind turbine speed- increase gearbox is carried out by using the rain flow circulation count method and Miner linear cumulative damage theory,and the fatigue life of the planet carrier is obtained. The structure is optimized based on the fatigue analysis. The reference for the fatigue life analysis of the planet carrier and designing of large power wind turbine speed- increase gearbox is provided.
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发布时间：2022-10-20 - 摘要：Recently,the polar coordinate method is successfully used to measure involute profile on gear measuring center and gear form grinding machine again. The measuring accuracy,efficiency,and convenience can be guaranteed and improved with the help of using some technology means,such as the calibrating the 3D（ or 2. 5D） probe accurately by means of ball gauge,using probe scanning technology to control measuring movement,using probe pre- offset to compensate the probe ball center offset and the method of specialized data gathering etc.
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发布时间：2022-10-20 - 摘要：The carburizing technology is widely used in gear heat treatment to improve the comprehensive performance of gear surface wear resistance,contact figure strength and bending fatigue strength,etc. The carburizing case quality must be strictly controlled to obtain the best comprehensive performance of gear. The evaluation requirements of the indexes of effective hardening depth,carbide and residual austenite in the carburizing case are introduced. Meanwhile,combining with the current situation of quality controlling specification and relevant standards of the carburizing layer at home and abroad,some suggestions are put forward for the carburizing case quality evaluation specification.
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发布时间：2022-10-20 -
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