Performance characteristics of disc spring will change when there is a little variation of its structure and material parameters,causing a large deviation of its physical life from the design life.Based on the issue that fatigue life of disc springs is affected by uncertainty factors,analytical robust design method was adopted to study the relation between fatigue life and uncertainty factors of hydraulic press head clamping device disc spring;fatigue life robust optimization model of disc spring was established,with minimizing the variance of disc spring fatigue life as objective function,the mean value of disc spring fatigue life equal to expected value as equality constraint,axial force of disc spring group larger than allowed value as inequality constraint;then robust optimization was carried out.Comparing with the design results before optimization,the results after optimization reduce the affection of uncertain factors to disc spring fatigue life as low as possible under performance constraints,and disc spring fatigue life stabilizes nearby the expected value,which improves the efficiency and reliability of the design．

In order to improve the prediction accuracy， the risk of wrong reliability measure as a result of inaccuracy of model existed in traditional reliability measure for highreliability， longlife laser products. Based on the performance degradation track， the nonparametric local linear regression estimation was proposed to estimate the actual degradation model directly， and then extrapolated to the false failure life time by using failure threshold and consequently made the reliability measure by employing the total life time date. Finally， a reliability test analysis through GaAs laser degradation date was done， it shows that this method improves the prediction accuracy of reliability， high fitted degree and perform robustness. The result based on nonparametric local linear regression estimation method is reasonable and precise．

The flexure joint has been gradually replaced the rigid joint which is applied to the highfrequency device as its structural advantages.Processing error is a kind of inevitable error which has a great impact on the performance of the flexure joint.Based on a detailed analysis of the various errors of the structural parameters,a processing error model was established using Paros J stiffness calculation formulas and Smith S T error analysis method,the forcedeformation state of the flexible hinge was simulated in the actual operating conditions in finite element method,and the accuracy of the processing error model was verified.It is found that different errors have different influence on the stiffness of the compliant joint,among them the width errors have the biggest influence．

For the purpose of attenuating the vehicle body lateral vibration,dynamics combined model of highspeed railway vehicle was established by using ADAMS/Rail and Matlab.The onoff and continuous skyhook method applied to lateral damper was simulated based on the combined model.The results show that the switchable skyhook 〖JP2〗method is simple and practical,but it may induce the chatter of the system and the result is inferior to continuous skyhook method.The continuous skyhook method has the better result in attenuating the vibration of the railway vehicle body,whereas,this method require the complicated damper structure and more realtime system.Considering this two methods advantage and shortcoming,the fuzzy skyhook method was put forward which was also based on the combined model.The research show that this method not only has excellent control result,but also can make up the disadvantage of the two methods mentioned above．

In order to investigate the mechanism and stability of caster wheel shimmy,2DoFs dynamic model of lever propulsion wheelchair steering wheel was established by analytical mechanics.This dynamic model was derived from Lagrange equation and its numerical solutions were solved by Ordinary Differential Equation (ODE) method.A new physical steering wheel model with adjustable parameters was built to verify the mathematical model.In the experimental stage,the theoretical results obtained from mathematical model as well as the dynamic behavior of towed wheel within different cases were successfully verified by vibration measurements.Stability analysis was conducted by Routh criterion on a linear dynamic model.To avoid the shimmy in the design stage,the genetic algorithm was applied to optimization design of the steering wheel system.Shimmy can be avoided after replacing a damped bearing with a set of reasonable parameters.Based on the stability analysis and optimization design conclusions,the shimmy problem of physical steering wheel has been solved.To avoid and eliminate shimmy,some practical suggestions are offered due to the effects of system parameters on shimmy,for instance,increasing length of the trail,applying a damped bearing and adopting reasonable parameters of geometry and mass.Therefore,the presented method is of good practical engineering value,and it also has a certain useful value for similar steering wheel system stability analysis．

The process of building the virtual prototyping and the dynamic analysis of a kind of actuated redundantly parallel seismic simulator was carried out by using the solid modeling software SolidWorks and the multibody dynamics software ADAMS . The virtual prototyping was built by virtue of SolidWorks and ADAMS . Then the position, the velocity, the acceleration of the sliders, the driving torque and power were calculated when the motion of the moving platform was defined in ADAMS . Finally, the required output work was also achieved by means of PostProcessor. The simulation results show that the maximal driving torque, the maximal driving power and the output work of the 3rd motor are biggest among all the motors according to the given trajectory. The whole process reveals the advantages of the virtual prototyping technique since it not only reduces the work of complex modeling and programming, but also completes the dynamic analysis of the parallel seismic simulator rapidly for the building of the prototype．

Flow，pressure characteristics of dual mode combination tooth gear pump were studied. By overlaying the different modulus，the lord，driven gear of double modulus tooth form were designed to increase the amount of volume changes in meshing process of the gear，and gear pump displacement was improved. The inside water hydraulic flow field of the external gear pump was simulated by using the software of Fluent. Flow field pressure imagery、velocity contours and velocity vector imaging were obtained under the start and steady states of gear pump，and gear pump flow pattern of the flow field was analyzed. The results show that with the same volume，output flow rate of the two module gear pump is 1.6-3.3 times than that of ordinary gear pump. The large teeth of gear pump separate flow field into different pressure region，and the large teeth^,s both sides have larger pressure difference. The flow speed in tip clearance liquid is faster. All above explain that the radial leakage of the two module gear pump is more serious. The phenomenon of vortex exists in the entrance of the pump，and it will produce pressure impact，and affect the life of the tooth surface．

According to the complicated environment of the outdoors,a wheeledtracked environmental robot was designed,the structure realization of the trackwheel device was expounded,also the protection device was designed to ensure the stability of the transformation.The mobile mechanism of robots may be changed according to the changing environment so as to improve the robot adaptation ability to the environment.A model was established in UG NX.Both the kinematic and the dynamic model of the robot with the wheels in the nonslip and slip condition were separately established,also Lagrange dynamics equation in the nonslip condition was built,the dynamitic coupling between the manipulator and mobile platform was analysed,the numerical simulation 〖JP2〗was finished in Matlab,it is concluded that the coupling between the two is not very clear in the low speed,but it is real in presence,the results provide a theoretical basis for the control system．

The traditional method used for solving the problem of the inverse kinematics of manipulator not only needs a large amount of calculation, but also has problem of many answers to the inverse kinematics question, it is very difficult to be used for the real time control of mechanical arm. This paper systematically studies the application of CMAC neural network in the inverse kinematics solution of the three joint mechanical arms. This paper simply introduced the CMAC network, vividly described motion of the three joint mechanical arms on a twodimensional surface, explained the inverse kinematics solution of the three joint mechanical arms in detailed, and then analyzed plus and inverse models based on the two CMAC networks; finally, to be verified through the simulation: in solution of inverse kinematics learning algorithm of the CMAC network is relatively simple, has no local minimum problem, and its convergence rate is relatively fast．

In order to solve the problem of the multidimensional vibration that the traditional tea sieving machine cannot complete the multidimensional vibration,a new thought about multidimensional vibrating parallel mechanism tea sieving machine which could satisfy the needs of tea screening was proposed.Based on the parallel mechanism composition principles,the main body mechanism of tea sieving machine was designed.This parallel mechanism contained three C-R-R chains which were vertical to each other in space.D-H matrix was applied to establish the kinematical model,and the kinematical positive and inverse solutions were presented.The result showed that the moving platform could get the ideal motion,and this parallel mechanism could be applied to the tea sieving machine.The virtual prototype of this mechanism was built by using Pro/E,and the model was added with kinematical pairs and imported to ADAMS software with Mech/Pro to complete kinematical simulation.The result of simulation proved the correction of the kinematical positive and inverse solution.Finally the test shows that the X,Y,Z three directions of vibration shorten the time through the sieve and can get the best sieving performance．

The design of the heat exchanger involves many factors， and the heat transfer ability is important to the heat exchanger structure design . It was difficult to analyze the heat exchangers heat transfer ability accurately in theory， so ANSYS finite element analysis software was used to study the process of heat exchanger. The system heat transfer theory was analyzed， the heat exchanger was modeled， thermal loading was loaded， and the temperature distribution of heat exchanger was got; it is shown by the analysis result that the heat exchanger can satisfy the system requirements， the system can reach thermal equilibrium again; the heat transfer performance of the heat exchanger is confirmed， and the structure of the heat exchanger design is feasible， and a foundation for the optimization design is laid．

In order to reduce notebook battery cover injection defects and increase success rate of trialmolding, mold structure optimization project of improving the quality of the product shape in mold design stage was proposed， the software Moldflow was adopted to simulate the injection mould of notebook battery cover. The influence of gate size， mold temperature and molding parameters on injection time， weldline and air trap locations were analyzed， the correctness of improvement was affirmed and the optimized injection molding parameters were got. Thus， the injection defects of notebook battery cover were solved and produce efficiency was increased. The result can provide gist for the mold designers to design and for the injection molding technologist to process parameter adjustment．

To some degree,the performance of semiconductor lasers is influenced by temperature,in order to improve the stability of their work,this paper designed a temperature control system semiconductor lasers.The system used 0.5 mA constant current source to supply power for Pt100 temperature sensor,fourwire measurement method was used to obtain accurate temperature signal.TLC2652 chopper amplifier was applied to design preamplifier.And a differential amplifier circuit was used to subsequently compare and amplify signal.The semiconductor cooler (TEC) was applied to achieve constant temperature control of the system.After the experimental data analysis,we can see that the constant temperature system can effectively work,the maximum deviation of temperature control is ±002 ℃.By adjusting the corresponding parameters,the temperature thermostat of system can be free to set,so as to use it in different temperature control environments．

To improve the inertia / mass ratio of attitude control flywheel used in small satellite and lighten the weight of flywheel attitude adjustment system,a brushless DC motor used in flywheel was designed.According to the motor magnetic circuit,the corresponding relationship between the size and maximum energy of magnet was derived.The influence of magnetic circuit parameters on the flywheel performance was analyzed by using the Finite Element Method (FEM).For the flywheel structure feature of large equivalent airgap and large ratio of diameter to length,a method for calculating airgap magnetic flux density was proposed.The relationship between winding parameters and the motor rated data was established.Simulation method was used to analyze the motor performances.Compared with a flywheel motor with the angular moment of 5 Nms at the highest speed of 6 000 r/min,the maximum error is 65%,which proves the correctness of the design method．

Manual vending rice in unit canteens has some shortcomings, such as uneven weight, poor sanitary and heavy physical labor.To solve the problems,a fullautomatic metering rice vending machine was designed.Firstly, the total target of machine was decomposed to obtain the tree function diagram.Then,funnel shaped rice warehouse,equipment of rice scattering and spiral equipment of sending rice were designed by function realizing principle,and the functions of rice scattering and uniform rice discharging were realized.The control system of based weight vending rice was designed on the basis of integrating SCM and electronic scales,the functions of accurate measurement and charging by swiping card were achieved. The design of support functions bring about other functions,such as keeping warm and auto cleaning.Finally,all functions were tested by making the prototype and practical application. The results show that the full auto rice vending machine has the function of accurate measurement,easy operation and high automaticity, and the expected purpose has been achieved．

In order to reduce the waste of resource and space caused by the diversity of childrens bike in the specific age group, and improve reasonability of ergonomics design, the design of multifunction children bike was studied. Through research and study of the entertainment, functionality, safety of the children bike design, we put forward design factors of entertainment and ride instead of walk. A project design was given by combining swing machine and childrens bicycle together through applying industrial design methods and ergonomics analysis. The project designed the handle size, the seat height and adjustability of the bike length from ergonomic. Moreover, the childrens bike was redesigned from the modeling, the structure, the producing process and the engineering output etc. As a result, the combined innovation design of childrens entertainment transport, has not only expanded the using function of childrens bike, but solved the problem of homogeneityoriented design at present. It will promote the design and production of the childrens bike in the future.