最新刊期
期 8 ， 2017
- 摘要：Based on the dynamics of rolling bearing,an improved slice method is used to solve the problem of needle-race contact,and the dynamics differential equations are established and solved by Predicting-Correcting GSTIFF（ Gear Stiff） integer algorithm with variable step. The impact of working parameters and roller crowned shape on the stress distribution of needle-race and bearing life is investigated theoretically,and it shows that,working conditions of bearing and roller crowned shape both have large effect on the fatigue life of bearing. Therefore,the optimum crowned shape of roller should be determined according to the working conditions of bearing.关键词：Thrust needle bearing;Dynamics;Improved slice method;Contact characteristic
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发布时间：2022-10-20 - 摘要：The process of hot rolling for the pinion of spiral bevel gear is simulated by using DEFORM-3D and the teeth formed process is analyzed. The simulation results show that the feasibility of rolling forming process. Based on the analysis of the physical field such as equivalent strain field,equivalent stress field,temperature field and the load-stroke curve,the parameters of rolling process are obtained.关键词：Spiral bevel gear;Hot rolling;Numerical simulation;Physical field
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发布时间：2022-10-20 -
Study on Vibration Characteristic of Trilobe Raceway Cylindrical Roller Bearing with Elastic Support
摘要：Based on dynamics analysis of rolling bearing,the dynamics differential equations for cylindrical roller bearing with trilobe raceway and elastic support are established. By using the predict-correct integer algorithm with variable step,the dynamics equation is solved,and the influence of structural parameters of elastic support and working conditions on the vibration characteristics of the bearing is investigated. The results show,that the inter-groove number,thickness circular beam and transition angle of elastic support have significantly effect on the vibration of bearings,but gap of groove has little effect on it. In a certain range of load and rotation speed,elastic ring can effectively decrease the vibration of bearing,elastic support with lesser inter-grooves can enlarge its impact-absorb range of load and speed,the elastic support also can reduce the bearing vibration caused by the impact load.关键词：Elastic support;Bearing dynamics;Trilobe raceway;Vibration- 4
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发布时间：2022-10-20 - 摘要：Considering the factors such as complex alternating load,meshing stiffness,meshing clearance,manufacturing and installation errors,the nonlinear multi-degree-of-freedom dynamics model of the clearance between the gear pair of the bridge crane reducer under complex excitation is established. By using the Runge-Kutta method of MATLAB/Simulink,the simulation solution of the nonlinear dynamic model of gear clearance is carried out. The effects of parameters such as load,tooth backlash,excitation frequency and damping ratio on the dynamic performance of the system are analyzed.关键词：Gear;Dynamics;Vibration displacement
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发布时间：2022-10-20 - 摘要：The polishing quality of the ceramic tile is mainly affected by the dynamic characteristics of the polishing head. The model of the polishing head is created and assembled to improve the polishing quality and reduce the rate of polishing brick,the simulation analysis of the polishing head virtual prototype is carried out by the software ADAMS and its motion characteristics curves is got. The result shows that the master rocker and slave rocker has similar dynamic characteristics,and the best polishing speed range is given from qualitative relationship between dynamic characteristics and the rotating speed of the polishing head. The results provide a useful reference for dynamic response and vibration suppression of polishing head.关键词：Polishing head;Dynamic characteristic;Adams
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发布时间：2022-10-20 - 摘要：To improve the lubrication performance,antiscuffing capacity and efficiency of worm gear pairs drive,the isothermal elastohydrodynamic lubrication（ EHL） simplified model and isothermal line contact mathematical model are established based on meshing theory of inclined double-roller enveloping hourglass worm drive and the theory of EHL. The oil film pressure and thickness curves are got by using Newton iteration and Newton-Raphson method. At the same time,the EHL characters on dedendum circle,reference circle,addendum circle of worm gear and every contact lines are analyzed,and the influence of lubricating oil viscidity on EHL characters of the inclined double-roller enveloping hourglass worm drive is analyzed at last. The result shows that this worm drive has better lubrication performance,the EHL characters from reference circle to addendum circle are better than other area. The oil film thickness of contact line 4 is bigger than other contact lines,the second peak pressure is smaller. The greater viscidity,the lubrication characters is better.关键词：Double-roller;Hourglass worm drive;Elastohydrodynamic lubrication;Oil film pressure;Oil film thickness
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发布时间：2022-10-20 - 摘要：In view of the shortcomings of high peak of crank torque and polished rod load,short stroke and serious wear of steel wire rope,the structural characteristics of the conventional beam pumping unit are analyzed. On the basis of that,the post pulley mechanism that change with the displacement of the suspended point and adjust the balance arm is designed. The steel belt is used to replace the traditional steel wire rope to fix on the post pulley. In the process of changing the balance arm post pulley driven steel belt around it to increase the stroke and reduce the friction loss. And the kinematic characteristics of this oil pumping unit are analyzed and calculated. Using the conventional beam pumping unit of CYJ10-1. 8-200 to calculate and analysis and find that the post pulley mechanism that is used has made the peak displacement of suspended point increase about150%. The solid model of the oil pumping unit 1∶ 10 is built and tested. The results show that the calculation and analysis results of this oil pumping unit are in accordance with the experimental results. The correctness of the calculation and analysis results of suspension point kinematic characteristics is verified.关键词：Post pulley;Beam pumping unit;Long stroke;Kinematic analysis
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发布时间：2022-10-20 - 摘要：Taking the Jatco CK2 transmission which is manufactured by Jatco company as the research object,through the research of CVT power loss,the transmission loss with reference to the largest proportion and how they are dependent on the drive and control performance are analyzed,and these contributions are loss of hydraulic pump drive power,clamping force and overload transmission slip. Based on the analysis,the measure of improvement drive and control is puts forward. When the servo motor driving system and transmission slip control is instead of hydraulic pump,the increased efficiency can be predicted,in 25% of the rated load,the CVT loss in half,and in full,it can be predicted the efficiency reduced by 25%.关键词：CVT;Power loss;Servo motor drive;Sliding control
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发布时间：2022-10-20 - 摘要：In order to study the coupling vibration mechanism of the planetary multi-stage gear transmission system,the dimensionless dynamics equations of the planetary multi-stage gear transmission system which contains a two-stage fixed-axis gear and a one-stage planetary gear are established. Contrasted the bifurcation characteristics of the two-stage fixed-axis gear,the planetary gear transmission system and the planetary multi-stage gear transmission system to study the nonlinear coupling characteristics of the multi-stage gear system. The results show that the crisis points of the 1st fixed-axis gear reduce due to coupling effects which increases the stability of the system. At the same time,the chaotic motion of the planetary gear is transferred to the fixed-axis gear,it causes a big range of chaotic motion on the 2nd fixed-axis gear and reduces the stability of the system.关键词：Multi-stage gear transmission;Planetary gear transmission;Bifurcation;Coupling characteristic
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发布时间：2022-10-20 - 摘要：The engine is in a dynamic state when vehicles in the starting,parking,braking and shifting.The optimal shift point is different from the ones designed in steady state. The neural network method is used to establish the dynamic model of the engine and the model is trained with the experimental data. Based on this model,three-parameter shift schedule including vehicle speed,throttle threshold,acceleration of the mining truck is designed. A dynamics model of the vehicle is established by MATLAB/Sim Driveline,the power performance of the designed shift schedule is verified by simulation analysis. This method can be used to modify the existing two-parameter shift schedule of the mining truck.关键词：Mining truck;Power performance shift schedule;Dynamic engine model;Artificial neural network;Three-parameter
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发布时间：2022-10-20 - 摘要：The dynamics analysis of a special rotating differential which situating to the variable tread vehicle steering function is carried out. Firstly,treating this differential gear transmission system as spring-mass of the nonlinear time-varying system with coulomb damping,a bend-torsion coupled vibration model with 12 DOFs is established. Then,considering the road to the wheel load torque in the process of the corners to be external incentive conditions of system,the affect of internal incentive factors on vibration characteristics of this differential gear transmission system is analyzed and the dynamics mathematical model is built. At last,by calculating this mathematical model and natural frequency,the phase path analysis is carried out and the characteristic parameters of this gear transmission system are optimized. The purpose of weakening the oscillation of the system performance and improving the response speed of system,making the system with satisfactory dynamic performance indicators are achieved.关键词：Special differential;Incentive factor;Phase path
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发布时间：2022-10-20 - 摘要：The structure of oscillating teeth end face harmonic gear is introduced on the basis of introducing the asymmetrical coefficient for describing the degree of tooth asymmetry. The engagement theory and shape equationof symmetry tooth is extended to the asymmetrical tooth of the oscillating teeth end face harmonic gear drive,thus the conditions of instantaneous transmission ratio constant and the equations of all meshing pair for asymmetrical tooth of the oscillating teeth end face harmonic gear drive are deduced.关键词：Oscillating teeth;End face harmonic gear;Asymmetrical tooth;Meshing pair;Teeth surface equation
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发布时间：2022-10-20 - 摘要：A novel pole-climbing robot is proposed for the cleaning and maintenance of urban pole-shaped buildings,by using a drive mechanism to complete the movement and clamping. The gait of the robot during climbing process is studied. The virtual prototype of the climbing robot is established. The climbing process of the robot is simulated by using ADAMS,which is multi-rigid body dynamics simulation software.The changing situation of displacement of the robot,torque of the motor and gripping force of the manipulator are analyzed. The simulation results show that the robot can complete the smooth movement according to the intended direction. The motor torque has fluctuation,but the climbing stability of the robot is not affected. The average contact force between the unilateral manipulator and the lamp poles is 32. 4 N. The robot has a good adaptability for the diameter variation of poles.关键词：Pole-climbing robot;Gait analysis;Virtual prototype;Dynamics simulation
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发布时间：2022-10-20 - 摘要：The Lagrange method is applied to build dynamics model of the 6 DOF redundantly actuated hybrid machine tool. Firstly,the configuration of the 4-PRP + 3-UPS&PU machine tool is analyzed,and the coordinate system is established. Then,the expression of kinetic energy and potential energy of the machine tool are educed,and the equivalent generalized force of non-conservative force is analyzed,and the dynamics model is established by using the Lagrange method,which laid the foundation for the solution of driving force and dynamics analysis. Finally,combining with numerical examples,the numerical results of the dynamics model of the 4-PRP + 3-UPS&PU redundant drive hybrid mechanism and mechanism driving rod drive curve are obtained by MATLAB,and the correctness and feasibility of the dynamic model is verified by ADAMS simulation results.关键词：Redundant drive;Hybrid machine tool;Lagrange method;Dynamics model
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发布时间：2022-10-20 - 摘要：The anti-falling safety is one of the key techniques for attached lifting scaffold. Aiming at the design defects of other structural style falling protectors,the structural features and working principle of star wheel falling protector based on passive technology are analyzed. The strength of critical parts in falling protector are checked by the strength calculation method of ratchet wheel. The calculation results show that the strength of inner ratchets and wedge block meet the requirements. By the anti-falling performance testing of scaffold,the results show,every falling protector can brake instantly to prevent continued falling when the scaffold falls. The falling distance of four position less than the specified value in national standards. The falling protector can effectively brake,which is safe and has a wide popularization and application prospect.关键词：Attached lifting scaffold;Falling protector;Strength calculation;Performance testing
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发布时间：2022-10-20 - 摘要：For the random of deviation step matching algorithm of single inner and outer ring in the fitting procedure certain of,a new iterative algorithm is quoted. The 10 pairs inner and outer rings is chosen after step matching to second matching,the mathematical model of second matching is established and the directed test matrix is introduced to establish the solving model of a new iterative algorithm. Comparing with before second matching,the result shows that randomness of matching is reduced and the y value of bearing increase by 4. 58%.关键词：Inner and outer ring;Matching;Fitting;New iterative algorithm
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发布时间：2022-10-20 - 摘要：A kind of CVT mountain bike is designed innovatively,the working principle and structure of the continuously variable transmission（ CVT） and booster are analyzed in detail. The driving force when CVT mountain bike started is calculated,all show that the bike started lightly with the reasonable transmission structure. The finite element analysis（ FEA） of frame and handlebar is carried out,the displacement contour and stress distribution figures of the frame as well as the displacement maps of the handlebar indicate that the structure could meet the requirements with a higher safety factor.关键词：Continuously variable transmission（CVT）;Booster;Finite element analysis
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发布时间：2022-10-20 - 摘要：The torsional vibration should be serious considered in the product design of the crown gear coupling of EMU. According to the structural characteristics and operating conditions of the crown gear coupling of EMU,the torsional vibration system mechanical model of the crown gear coupling is established by using lumped parameter method,and the differential equation of torsional vibration is established. The natural frequencies and the principal modes of system are obtained by solving the differential equation of torsional vibration. Moreover,considering time-varying meshing stiffness of inner and external teeth,the simplified calculation method for torsional stiffness of gear is presented. Finally,an example about analysis of torsional vibration for the coupling of EMU is given. The method of analysis of torsional vibration can provide some reference for vibration control and design of the crown gear coupling of EMU.关键词：EMU coupling;Crown gear coupling;Analysis of torsional vibration;Torsion stiffness
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发布时间：2022-10-20 - 摘要：The checking of the robot travelling mechanism friction coefficient and a design refinement of the driving structure is carried out based on theoretical calculation and rule of thumb data,facing the creeping phenomenon of the robot travelling mechanism. Taking the typical robot travelling mechanism that common used in the modern industry as examples,a description of its basic structure is carried out,aiming at the creeping phenomenon happened in the practical application,the checking of the friction coefficient of the heavy robot travelling mechanism is carried out based on the combination of inverse method and teaching-playing,also the reference experience value is elicited and the design refinement of the driving structure is finished.
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发布时间：2022-10-20 - 摘要：The effects of shaft angles,which define the locations of gear centers,on dynamic characteristics of a split torque transmission system with herringbone gears are investigated. Firstly,the shaft angles are derived based on adjacency relationship,concentric relationship,geometrical conditions and installation conditions. Then,the dynamics model of the motion of the system which consists of shafts,bearings,gear rotors and the process of gear mesh is established based on the finite element node modeling method. Finally,the dynamic response of the system is calculated based on rotor dynamics theory,and the dynamic load coefficients and dynamic transmission error are obtained under different shaft angles so as to indicate the effects of shaft angles on the dynamic characteristics. The research shows that shaft angles have a great influence on the dynamic characteristics of the system,when the shaft angle is different,the frequency domain distribution of system dynamic response is very different,at different speeds,the shaft angle has different influence on the dynamic load coefficient and dynamic response.关键词：Split torque transmission system;Herringbone gear;Shaft angle;Dynamic load coefficient
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发布时间：2022-10-20 - 摘要：The finite element analysis（ FEA） model of silicon nitride ceramic ball bearing is established by ANSYS Workbench based on Hertz theory assumption,the contact stress distribution between rolling bodies and rings are attained,the FEA calculation results and Hertz contact theory can match well,which illustrates the correctness of the finite element analysis model. On this basis,the Rotating load and friction are applied to the FEA model to overcome the limitation of the Hertz contact theory,the contact stress distribution of the bearing under complicated working conditions is obtained. Taking the maximum contact stress as the objective function,the curvature radius of the inner and outer rings are optimized by using the direct optimization method.After optimization,the maximum contact stress of the bearing is decreased by 9. 21%.关键词：Ceramic ball bearing;Curvature radius optimization;Contact stress;FEA
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发布时间：2022-10-20 - 摘要：Since windage power loss from spiral bevel gear in aero application has adverse influence on aero engine fuel efficiency,it is beneficial to conduct investigation on minimizing the loss. The simulation analysis of the windage loss of spiral bevel gear is carried out,the influences of four different types of baffles on the windage loss are studied,the influence of varying distance between baffles and gear,with different gear tooth tangential velocities is considered. Taking the central drive spiral bevel gear of an aero engine as example,the preliminary evaluation of applying baffle in practical design is conducted. The results indicate that baffle could significantly reduce windage loss,by nearly 75%,whereas a failed configuration of baffle will increase windage loss,by 25%. The higher influence is achieved with smaller distance between baffle and gear. The similar trends are obtained with different gear tooth tangential velocities.关键词：Windage loss;Spiral bevel gear;CFD;Baffle;Aero engine
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发布时间：2022-10-20 - 摘要：For the detection and identification problems of common faults in the use of gearbox,considering the nonlinear,non-stationary properties of the gearbox vibration response signal,a method for the gearbox fault diagnosis based on local mean decomposition（ LMD） approximate entropy and PSO-ELM is proposed.Firstly,the LMD decomposition method is used for gearbox vibration signal,with correlation coefficient method extracted the first four PF components which contain the main fault information. By using the approximate entropy to describe quantitatively,and the feature vector is formed. Finally,the input weights of ELM and the threshold value of the hidden layer neurons are optimized by the particle swarm optimization algorithm,the model of PSO-ELM is established,and the approximate entropy values are input into the ELM and PSO-ELM models to recognize and classify the fault types of the gearbox of different conditions. The results show that based on LMD approximate entropy and PSO-ELM has the higher classification accuracy,the feasibility of this method is verified.关键词：Gearbox;LMD;Approximate entropy;PSO-ELM;Fault diagnosis
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发布时间：2022-10-20 - 摘要：The mechanical exoskeleton is a kind of new electromechanical device that imitates the biological exoskeleton. A wearable flexible knee joint exoskeleton is designed,and the kinematics and dynamics analysis of the lower limb is carried out through using the human body 5 bar simplified model. The angle change curve of the knee joint is consistent with the CGA database through the Matlab/Simulink simulation and the correctness of mathematical model is verified. The lower limb exoskeleton can walk normally through the dynamic simulation of ADAMS,the correctness of the driving function of the knee joint is verified and the torque curve of knee joint is prepared for the control. Finally,the physical prototype is developed and the rationality of the exoskeleton is proved through the angle change curve of the knee joint in the contrast experiment of wear or not-wear exoskeleton.关键词：Exoskeleton;Wearable;Compliant;Knee Joint
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发布时间：2022-10-20 - 摘要：Taking the double-track crawler robot as study object,the robot system composition and the action planning,stability analysis and obstacle clearance performance calculation of the climbing stair are introduced in detail. The DSP system TMS320LF2407 is used as the motion control core,and two MAXON motors are used to control the left and right tracks to realize the differential steering. The system can realize the real-time response of the robot to the user instruction and the scene environment through the voice and image acquisition system. Based on the centroid kinematics and optimization theory,the relationship between the maximum obstacle clearance height of the robot and the elevation angle of the front swing arm and the step height under the critical condition of the robot stability are obtained. The experimental results of climbing stairs show the correctness of the theoretical analysis,and some theoretical basis for the design of this type of crawler robot is provided.关键词：Tracked robot;System composition;Stability analysis;Obstacle performance calculation
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发布时间：2022-10-20 - 摘要：The fixture is important process equipment in the automobile body assembly,and the reusability of fixture has become the key factor to hinder the efficiency of automobile production efficiency and assembly restructuring. For the automotive components of the sheet with different curvature radius,a set of reconfigurable modular fixture is designed. The sheet with different curvature radius is clipped,and it is not necessary to reconstruct the system,this is widely used in industrial production design standards. A modular fixture is designed,and its kinematics analysis is carried out to verify its rationality and stability.关键词：Fixture;Modularization;Sheet;Kinematics;Simulation
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发布时间：2022-10-20 - 摘要：Applied the theory of curve and surface of differential geometry,based on the noncircular bevel gear profile researched and developed successfully by research team. The construction principle of the tooth section line of the spiral noncircular bevel gear is studied. Based on the mapping method,the mathematical model of the tooth section line of the spiral noncircular bevel gear is built. On the basis of the theory and algorithm of osculating planes,the solid model of the spiral noncircular bevel gear is built. The solid model of another spiral noncircular bevel gear is built according to the enveloping principle. The correctness of the algorithm and the model is verified by the kinematics simulation results. The research results provide theoretical and technical support for the improvement and innovation of the design and meshing theory of the spiral noncircular bevel gear in the variable ratio limited slip differential.关键词：Variable ratio;Noncircular bevel gear;Tooth section line;Mathematical models;Movement simulation
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发布时间：2022-10-20 - 摘要：In the multi-axis super-heavy-duty test platform,the high-power transfer case has the problem of broken teeth during fatigue endurance. The comprehensive analysis is carried out on the failure gears,the causes of gear damage,such as gear strength,shaft and box stiffness,gear tooth profile and tooth orientation precision,surface heat treatment,etc. are analyzed one by one,and finally it is positioned as the gear tooth surface grinding burns,resulting in reduced hardness of the tooth surface,contact fatigue strength decreased,the occurrence of premature failure damage. In the improvement work,the grinding process of the gear tooth surface is modified,and 100% grinding burn monitoring is added. The improved high-power transfer case passed the fatigue endurance test.关键词：Transfer case;Failure analysis;Grinding burn;Fatigue test
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发布时间：2022-10-20 - 摘要：A type of automobile gearbox has box cracking problem,in order to make a structure optimization and precise modal analysis of the automobile transmission shell,with this type of automobile transmission shell as the research object,the automobile characteristics are studied,the optimal excitation direction and frequency band of the dynamic response of the gearbox are obtained,understanding of the inherent characteristics of the transmission shell. Then,by combining the finite element analysis and experimental modal analysis,the modal analysis of automobile transmission shell is carried out,after comparing the obtained data,the reasons for cracking of the transmission shell are analyzed,the foundation for the follow-up of the structural optimization of this type automobile transmission is established.关键词：Automobile transmission shell;Vibration characteristic;Finite element analysis;Modal analysis
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发布时间：2022-10-20 - 摘要：There is a third-grade gear tooth fracture problem,when the MW-class wind power growth gear box running a year or so. The reason of the failure of the three-stage gear is analyzed from the operational,design,material,manufacturing and assembly factors. The results show that the failure of the third gear is the assembly problem of the third gear. The coupling bolt is not fastened in place,resulting in gear tooth fatigue fracture.关键词：Wind turbine generator;Wind power gearbox;Fatigue fracture;Failure analysis
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发布时间：2022-10-20 - 摘要：With the gradual popularization and maturity of wind energy resources exploitation and utilization technology,the installation and running environment of large wind turbine gradually develop from conventional flat terrain to complex terrain,which result to worse operation conditions and more uncertain inflections.So it is very necessary to test load of wind turbine when the whole machine is running under complex terrain. A3. 0 MW wind turbine in Guangxi Gongcheng wind field is chosen as the testing object,together with special test scheme,based on the MATLAB software development procedure to analyze the testing data. The rain flow method is used to get the load statistics of blade and tower tube and the 10 min-equivalent load scattering plot.Comparing load optimization quantity and dynamic characteristic of conventional group and that of group with optimized strategy,the results indicated that load optimization changed load characteristic that helped to prolong the fatigue life of wind turbine. It has great significance for the guidance of large wind turbine installation and operation under complex terrain and can provide further support for research and manufacturing of large wind turbine model suitable for complex terrain.关键词：Wind turbine;Complex terrain;Load test;Load optimization
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发布时间：2022-10-20 - 摘要：According to the design criterion of roller chain sprocket,the parametric design of roller chain sprocket is completed based on SINOVATION7. 0. The users can set the parameter values according to the roller chain sprocket type,row number,tooth number and other basic parameters,then the chain wheel designer can be compiled to create the 3D model and calculate the strength and of the sprocket. It not only can output report for HTML,but also can export as CAD graphics and be assembled. With the help of the parametric design of roller chain sprocket,the design efficiency is improved and the cost is saved.关键词：SINOVATION;Parametric design;Secondary development;Roller chain sprocket
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发布时间：2022-10-20 - 摘要：Taking a casting aluminum alloy gearbox as the research object,a high precision and easy to control gearbox housing deformation test system is designed by the mode of hydraulic servo control. The test system can also be used for the torsion test of various transmission parts,such as a transmission shaft,a clutch,etc. by properly configuring the corresponding fixture. In order to comprehensively consider the dynamic and static deformation process of the gearbox,a loading method of variable slope and variable amplitude is used to establish a simple and easy method for deformation test of gearbox. The feasibility of the deformation test system and the test method of the gearbox is verified by the test that combined with an enterprise gearbox. And this not only provides an important means for the deformation test of the gearbox,but also provides the accurate basic data for the transmission shell stiffness and NVH design,analysis and optimization.关键词：Gearbox;Housing deformation;System design;Test method
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发布时间：2022-10-20 - 摘要：In view of the cycloid gear profile,an efficient discrete interpolation algorithm whose rotation angle intervals are auto adjusted by the curvature and errors are calculated by the numerical method is proposed. Based on this algorithm,a cycloidal tooth profile design module is developed. Meanwhile,the results of equal-pitch algorithm,equal-step algorithm,equal-error algorithm and this efficient discrete interpolation algorithm are compared which verified the feasibility and effectiveness of the method. Based on this design module,a data channel between discrete interpolation and engineering drawing software and 3D modeling software as well as the CNC machine tools is constructed.关键词：Cycloid gear;Discrete interpolation;Chord error;Comparison validation
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发布时间：2022-10-20 - 摘要：A movable teeth driving system integrated with shape memory alloy（ SMA） and movable teeth reduction drive is proposed,which used SMA wires to drive the movable teeth transmission system and realize torque output. It has the advantages of small size,low speed and large torque. The structure and working principle of the SMA movable teeth driving system are introduced,the main performance design process and parameters of the system are given. And force conditions of movable teeth transmission system in the system are analyzed,the forces on the movable teeth of wave generator,movable teeth rack and center wheel changed along with output shaft angles are obtained. The results laid a theoretical basis on dynamics analysis and experimental research of the SMA movable teeth driving system.关键词：Movable teeth transmission;Shape memory alloy（SMA）;Mechanical design;Force analysis
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发布时间：2022-10-20 - 摘要：Aiming at the difficulties in the selection of planetary reducer in an enterprise,a planetary reducer selection software is developed to improve the efficiency of selection. The software is developed based on Visual Basic 6. 0 and Access 2013,the XML format is used for formula storage. By analyzing the selection process and the factors of the selection,the required parameters are selected,the calculation formula of motor-reducer-load transmission process is analyzed and deduced. The database,calculation module,auxiliary function module and planetary reducer selection system are designed. Finally,the feasibility of the planetary reducer selection system is verified by concrete examples.关键词：Planetary reducer;Selection system;Database
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发布时间：2022-10-20 - 摘要：In order to improve the efficiency of rolling welder for steel bar cage,a welding machine with capturing and tracking is proposed,considering the motion characteristics of solder joints formed by the joint of stirrup and the main reinforcement. The device includes two parts,which control the movement of the vertical and horizontal direction of the welding torch. The pneumatic control mode is used to control the motion of the welding torch in the plane with the interaction between the induction switch and touch panel. The device has the characteristics of automatic capture to the solder joint,and it can also track the solder joint after the capture,the automatic level and production efficiency of the steel bar cage welding is improved.关键词：Steel bar cage;Rolling welder;Automatic capture;Welding device
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发布时间：2022-10-20 - 摘要：The calculation methods of all the geometric parameters and their tolerance involved in the latest national standard（ GB/T 3478. 1-2008 GB/T 3478. 9-2008） of the involute spline are summarized and sorted,the process of program calculation is determined respectively,the successful operation of the program is realized through the programming of VB program code. Finally,the accuracy of the calculation result is proved by the comparison with the national standard given numerical value,which also proves the practicality of the calculation procedure.关键词：Involute spline;Geometrical parameter;Calculation;Program design
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发布时间：2022-10-20 - 摘要：The spiral bevel gear is one of the most important and complicated transmission gear with large load carrying capacity and smooth transmission,it is widely applied in the aviation and spaceflight and automobile industry. The theoretic study and manufacturing level are the important symbol of one country’s mechanical industry level. The development in the field of Gleason spiral bevel gears technology including theory and design,manufacture,equipment and machine tools,material and heat treatment process is analyzed. The future developing trend in this field is also prospected.关键词：Spiral bevel gear;Gleason machine tool;Design and manufacture technology;Gear heat treatment
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发布时间：2022-10-20
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