Discusses the machining performance of different electrode materials,namely brass wire and zinc-coated wire,in Wire-Cut Electrical Discharge Machining(WEDM).The Material Remove Rate,surface roughness and surface topography had been selected as the performance indicators.The results showed that,compared to the brass wire,the zinc-coated wire could obtain the higher material remove rate,smaller surface roughness and better surface topography when machining the Ti₆Al₄V steel.

Applying composite to FSAE car suspension is benefit to reducing both of the vehicles mass and sprung weight,and the connectors between carbon fiber composite circular tube and metal are often jointed by adhesive bonding technology.Based on some relevant hypotheses and boundary conditions,an equation of strain energy for adhesive joints was established to describe the response of axial load.According to the variational principle and the minimum potential energy principle,the distribution of stress in the mid-surf of adhesive was revealed.Comparisons between the analytical results and the finite element results show out that they are in good agreement with each other.So it can be deduced that the analytical model is reasonable for the stress evaluation of the bonding between the fiber circular tube and metal.Furthermore,influences of geometrical or material parameters to the shear stress distribution were investigated.Inherent characteristics of the adhesive bonding were given out which are helpful to optimize the mechanical behavior of the bonding in turn.

The ABS logic threshold control strategy considering different axle load of front and rear axle as well as braking axle weight transfer is studied.The control of wheel sliding rate is as the main control objective and the control of the wheel angular acceleration is as the auxiliary control objective.The different optimal slip rate range of front and rear wheels are determined through the simulation experiments.Vehicle braking performance is improved in the low adhesion and split road by using the control mode,in which the high brake pressure of the front axle is selected and the low brake pressure of the rear axle is selected.Writing the control strategy program and the control strategy is verified based on driving simulator hardware in loop brake test bench in emergency braking condition of low adhesion and split road.The results show that the control strategy has a good real-time performance and shorten the braking distance,improves the directional stability of the car when braking.

The performance testing of electric insulation is an indispensable part in production processes.There are some advantages in using the adaptive nonparametric CUSUM control chart to the online performance testing of electric insulation .First,it can save steps of fitting distribution form;second,it can ensure the monitoring accuracy and efficiency in detecting various magnitudes of mean shifts.So,detecting online by the adaptive nonparametric CUSUM control chart can keep the insulating property of products steady,and reduce the loss rate of productions.

Numerical method for reliability sensitivity design is presented based on fourth moment technique,and the reliability sensitivity of the capstan in track-laying vehicle with non-normal random parameters is extensively discussed.The variation regularities of reliability sensitivity are obtained and the effects of design parameters on reliability of the capstan in track-laying vehicle are studied.The method presented provides the theoretic basis for the reliability design of the capstan in track-laying vehicle,the production can be very useful if it extended to correlated area of machine sensitivity design.

Because the profiles of scroll compressor is very complicated,narrow alveolar,large ratio of height to thickness,large deformation,high precision and cutting chatter when high speed cutting,it has obtained the modal parameters of rough workpiece,finish workpiece,keyway cutter and end milling cutter by finite element method.The curves fitting of feed speed,cutting speed and vibration frequency,which can be used to guide for the selection of process parameters,to prevent cutting resonance,were acquired by MATLAB software.The validation and reliability of the scheme was verified by experiments.

To improve robot positioning accuracy affected by robotic error,a robotic error measuring method based on a plane with distance measure function is proposed.Robot kinematics model existing error was expressed by Modified Denavit-Hartenberg(MDH) model.Combined with the distance error model,the distance error on the plane minimal constraint model equations was derived and nonlinear least squares method was used for solving equations.The specific implementation steps of error measuring method were summarized and identification error was determined by simulation.Resistive touch screen used as a measurement tool,the method was applied to the KR5arc robot.The experiments results show that the error decreases after compensation.The method is effective and applicable to most industrial robot error measuring.

A kind of electrically driven quadruped bionic robot is designed,which has the main and passive structure and the robot’s leg joint structure based on the electric cylinder.The purpose is to explain how the quadruped robot walks.D-H coordinates are given a kinematic calculation method.Kinematic modeling,the inverse kinematics calculation of robot with the aid of kinematic model,the corner function of the joints of the robot was solved.A method of gait planning for a four legged robot is proposed for the walking of a robot.Simulation experiments show that,the robot walks stably,the foot trajectories are smooth and the undulation of body has small amplitude.

A new method was proposed on controlling exoskeletal robot by using Kinect sensor in order to make the movement of exoskeletal robot more conforms to human motion.With vector constructed by skeletal data,the angle for somatosensory control was acquired through dividing and calculating the space angles of upper limb joint according to the coordinate system of human body.Kalman filter was used to smooth the angles and the result showed that Kalman filter can better improve the stability and real time property of data.The maximum of angular velocity and the ranges of angles were set up for security.Lastly,the processed data was passed to the exoskeletal robot model which was built up based on LabVIEW for real-time control.According to the effect of real-time control,the data processing method was accurate and reliable that provides reliable references for the development of the physical prototype.

In view of design and processing difficulty for complex crankshaft,reverse technique was applied to a type of four-cylinder crankshaft’s self-replication and model reconstruction.Data acquisition of the crankshaft was carried out through industrial 3D measuring instrument with optical dynamic tracking(Creaform VXtrack C-Track 780).After that,initial point cloud data of it was dealt with splicing,denoise,filling hole and repair processing in Geomagic Studio environment,and its initialization assembly model with surfaces was constructed successfully,thus then NURBS surfaces of the crankshaft with more better precise and quality was set up based on that.CAD model of the crankshaft on CREO platform was reconstructed by parameter exchange,and its structure was translated into the form of parameterization and feature.Besides,quality analysis of the crankshaft was done by Geomagic Qualify module,and cloud chart of chromatographic error was calculated,thus an important basis was provided for crankshaft’s detection and innovative design,at the same time,a new method and idea were also provided for crankshaft’s design and manufacture.

With the bottleneck of production line of B company PC unit process for standardization to improve,to solve the problem of assembly line assembly rate is low.Mainly use the action time of the scheduled standard method of MOD method (model method) to analyze the bottleneck of production process and improve standardization;through the analysis of the bottleneck process each action,and find out does not accord with a standard,unnecessary action,using question 5W2H method to analyze the problems and find out why,using the economic principle of motion to the non-standard action to improve and to the standardization and normalization.After improvement,production line balancing rate from 33.6% to 63.5%.

Aiming at the problem that the existing method of component matching of CNC system can not meet the needs of the user's component matching,description logic is used to describe the request of component and provide of component.Based on the classification of the components,a method of component matching based on description logic is presented.Finally,an example shows that the proposed method can effectively help users to select components.

Lower extremity injuries occurred frequently in frontal crashes.The risk of lower extremity injury can be effectively reduced by taking use of energy absorbing during pedal fracture.However,the accelerator pedal was often neglected or replaced by a simple rigid body in simulations.As a result,the research cannot reflect the real situation.Thus,a precise accelerator pedal finite element model was established.According to the force transmission between foot and pedal,the pedal was fixed in two methods in the experiments.The model was validated by comparing the experiments and simulations under different conditions.To improve the relativities between the experiments and simulations,a series of influence factors are discussed,such as element type,element size and the formula of integration.Finally,the relativities were raised up to more than 90% under all conditions.

Analyzes a certain type of pure electric urban logistics vehicle battery box’s finite element modal and experimental modal,giving its modal frequencies and mode type.And by comparing the finite element modal and experimental modal’s analysis results,verify the reliability of the battery box finite element model.Based on the experimental modal analysis to get region and goals for battery box to optimize.Using the finite element method of comparative battery box before and after optimization mode,the results show the optimized battery box modal frequency has been generally improved.It has a certain reference value to the battery box structure design.

In order to reduce the vibration of the frame,a type of micro electric vehicle frame was studied.And the static of the frame are analyzed based on the finite element software,then the structure of the frame is improved according to the deformation and equivalent stress distribution.The mode of the improved frame is analyzed and the first 6 order natural frequencies and modes are extracted.And dynamic tests are performed to verify that the results are correct.According to the analysis results,the maximum deformation of the improved frame is reduced by 79.75% and the maximum equivalent stress is reduced by 48.64% under full load and left front wheel suspension condition.And the maximum deformation of the improved frame is reduced by 76.30% and the maximum equivalent stress is reduced by 55.63% under full load and diagonal two wheel suspension.And the ceiling vibration is main in the natural mode of vibration and the first order modal frequency is 7.803 2Hz.

Adopting the extend Kalman filter theory,a key target distinguish method is researched in order to avoid the goal confusion or missing of automobile cruise system in the curve road.An extend Kalman filter on yaw rate and a key target distinguish model are established for estimated the road curvature in real time and decided the critical target based on a nonlinear three degrees of freedom vehicle model.A simulation module was elaborated by using MATLAB/Simulink to validate the estimation of yaw rate and side slip angle based on the high-speed double lane input.With joint simulation of Carsim and MATLAB/Simulink,the simulation experiments are given to judge the key target for multiple targets in the curve road.The simulation results show that the proposed method can identify accurately the key target in the curve road and avoid rear-end collisions effectively.The research results can offer the theory reference for improving or perfecting the control performances of automobile cruise system.

In order to get a tractor frame structure which meets the requirement of static multi-stiffness and dynamic natural frequencies in conditions,the topology optimization was introduced into the design of frame structure.A compromise programming method was adopted to establish the mathematical model of multi-stiffness topology optimization,while the average frequency method was adopted to settle the mathematical model of the objectives of natural vibration frequencies topology optimization,and compromise programming method was also adopted to establish the mathematical model of multi-objectives which combined stiffness and natural vibration frequencies.A reasonable topology structure of frame which met the requirement of multi-stiffness and natural frequencies was obtained at the same time.The simulation result shows that the frame can meet the performance requirement,which verifies that the rationality of multi-objective topology frame design is feasible.

Due to the powerful function of this software,and no programming background of engineering and technical personnel also easy to learn,so this article use the LabVIEW software write control program.Based on the control mode of the research,using the LabVIEW software program to control the pneumatic proportional valve,to control the position of the rodless cylinder in the end.Respectively by traditional PID controller and the state of the controller to control the position of the rodless cylinder,by comparing the experimental test curve,prove state controller of rodless cylinder position control accuracy is higher and more stable.Especially the square wave location tracking characteristic is better,prove state controller is more suitable for pneumatic position servo control system.

Logarithmic spiral bevel gear is a new and great valuefull bevel gear,its accurate three-dimensional model is important to the future research work.Based on the three-dimensional software Pro/E and the principle of the formation of logarithmic spiral bevel gear,the spherical involute was established and regarded as a logarithmic spiral bevel gear tooth profile,logarithmic spiral line was used as logarithmic spiral bevel gear tooth line,logarithmic spiral bevel gear was established by the way of sweeping a plurality of guide line.In addition to Pro/E for the secondary development platform,C language programming was used to establish a software,which complete the creation of bevel gear only need to enter the appropriate parameters.

Aircraft configuration management is a complex systematic cooperation problem,configuration control involves effective communication and collaboration among many disciplines and departments in the development process,high communication cost and low efficiency have been the technical difficulties in model development and batch production.By the evolution of version and edition and the practicing research on changing the process model,proposed the relationship of configuration object’s 3D expression model and configuration item’s expression model.The correct relationship between configuration management and 3D development environment is further demonstrated based on the application verification which changing by 3D visualization.The application of 3D technology in configuration management will greatly improve the automation level during the development process.

Based on the finite element software of ABAQUS,the Python language was used for pre-processing module of ABAQUS for secondary development.By discussing the ways of ABAQUS secondary development,developed a Python script on cutting simulation of titanium alloy.The procedure was characteristic of friendly interface and strong operation so that users can create a simulation model according to actual parameters of cutting titanium alloy.This method not only improved the efficiency of the analysis,but also provided users with a convenient platform for analysis and design.The procedure was used to analyze the influence of cutting depth on the main cutting force in cutting of titanium alloy.Verified the feasibility of the function and gave a way for further research on different cutting rates on the main cutting force in cutting of titanium alloy.

The application of the Radio Frequency Identification (RFID) in the work piece on the production line is proposed considering the costs,recognition speed and et al.Firstly,the location system of the production line workpiece is designed based on the fundamental technology of the RFID.Then the system hardware selection and based on MATLAB neural network system are realized and the feasibility is verified in the laboratory experiments.The experimental results show that location function can be achieved based on the received signal strength of the antenna and the locating accuracy of the system can be controlled within 4cm for one 60cm × 50cm area while the maximum Euclid error is less than 3.9cm.

To solve the problem of various material distribution routes and uncertain operators in assembly shop,considering the utilization of operators and the loading rate of material vehicle,an optimization model of lean material distribution was proposed with the target of minimizing total distribution time and the number of operators.The improved genetic algorithm was used to solve this model.In order to solve the problem that the multi-objective optimization genetic algorithm difficult to converge in practice and have a lot of illegal solution,in the design process of algorithm,it uses integer coding to reflect directly operators distribution routing and allocation of tasks,and add illegal solutions for inspection in crossover and mutation.The example verifies feasibility and effectiveness of optimization model.

Combined with the factory testing requirements of the self-adjusting thread insert of automobile brake clamp,inspection platform is designed to inspect the high pressure gas tightness of self-adjusting thread insert,micro leakage detection of self-adjusting thread insert by using the method of internal pressure differential method,and using control mode of combinating with PLC and MCGS,completed the motion process control,data acquisition and processing,automatic analysis and display of test results.The test results show that the inspection platform can accurately detect the sealing performance and pressure resistance of the self-adjusting thread insert,and the detection efficiency is high.

Motorized spindle characterizing by short transmission chain is widely used in CNC machine tools for its high speed and accuracy.Conventional test for spindle emphasizes on static characteristic.A comprehensive test table is designed for machine center motorized spindles.Based on the evaluation and test method introduced,the geometric accuracy of axes of rotation is measured,including synchronous and asynchronous error for both radial and axial directions under different speeds.By the method of in-situ average filter and off-situ low-pass filter,thermal deformations are measured and the accuracy is comparable with commercial spindle thermal test instruments.A load and speed characteristic test system is introduced and the maximum torque is measured.Using modal test system,the frequency response characteristic is achieved with the measured 1^st natural frequency in both radial and axial directions.

The trend of stress forming were explored by several cutting parameters to the PC part during the process of shaping.And several heat treatment technics of eliminating stress to the PC part were researched.The result proved that the revs and steps of reamer were important parameters to the stress forming during the process of shaping.But an appropriate cutting parameters about the revs and steps of reamer would control the stress forming.The heat treatment technic of multi-process heating and descending temperature can avoid stress to the PC part.

Davenport power spectrum of pulsating wind and AR model method in the linear filtering method were employed to simulate wind velocity of pulsating wind field,the spectrum of pulsating wind was found in agreement with the target spectrum.The structure vibration response of a certain type of tower crane was calculated under the impact of static wind load and fluctuating wind load respectively based on the software ANSYS.A comparison between the computation results was also done.On the basis of the results,the method of AR model was accurate and effective for simulating pulsating wind field;the tower crane structure will have larger vibration under the impact of pulsating wind and the computation results will be unsafe if the pulsating wind wasn’t considered.The joint of the 4^th jib and the 5^th jib of tower crane is likely to arise maximum stress,which need pay attention to in the process of tower crane design.

In order to improve the stability and the life of the candle filter in ballast water filter and obtain the flow field characteristics,ANSYS CFX software was used to analyze the fluid region which the candle filter in.Based on fluid-solid coupling theory,the statics structural characteristics of the candle filter was analyzed to determine the limit of rotation speed which should be less than 2 640r/min of candle filter.

The cabinet design is the primary content in thestructural design of the electronical equipment,which has become the important process to carry outequipment technical target.Introduces the design methods ofa type of anti-adverse circumstance reinforcedcabinet,describes particularly thermal design,Electro Magnetic Compatibility (EMC) design,anti-libration andanti-impact design.According to the experimentation,the anti-adverse circumstance reinforced cabinet has good reliability,and is provided with comprehensive proofing capabilities.

The existing structural damage identification methods were separated into the damage identification method of railway bridge machines and of other structures in this research.This classification was intended to analyzing the effects and the limitations of existing damage identification methods which were widely used in testing the railway bridge erecting machines.The prospects for development of the prospect of damage identification method of railway bridge girder erecting machines was put forward according to the characteristics of the practical application of railway bridge machines in damage identification.It is a researching direction that the damage identification method uses deflection influence line of displacement curvature which is based on the actual working conditions of railway bridge erecting machines.