During the process of compacting SiC particles reinforced Cu matrix composite powder to green compact,the forces and reasons for cracks of green compact were analyzed. A die for this kind of composite material was designed and improved. Moreover,corresponding demolding technology was studied according to characteristics of the composite materials. Results show the designed mould can prevent green compacts from deformation and cracks effectively and surface finish of the compacts is very smooth. In addition,mould structure is simple; assembly and disassembly are all convenient; the mould is practical safety and is of high compacting efficiency.

On the basis of Manufacturing Execution System (MES),the carbon footprint in the process of manufacturing workshop is researched and the calculation method of carbon emissions at the station level is proposed.In order to realize the real-time monitoring of carbon footprint at the station level,the carbon emissions is regarded as an important quality characteristics of statistical process control,and the statistical process control model of carbon footprint based on the Bayesian theory is puted forward.The model is applied to the MES of a instrument manufacturing enterprise and the effectiveness is demonstrated.

The door system is a relatively independent part in the vehicle body.Its mass,stiffness,modal and crashworthiness have a significant effect on vehicle performance.To reduce the mass of the vehicle door and ensure the stiffness,modal and crashworthiness performance,a novel multi-objective discrete robust optimization algorithm which is achieved by coupling successive Taguchi method with TOPSIS entropy-technique for order preference by similarity to ideal solution is proposed to optimize the structures of automobile door involving disturbance factors. This algorithm makes full use of the decision information of the test date to improve the optimization efficiency.It can avoid the problem in which weight is not objective in traditional method.The result of the example shows that the method can not only ensure the stiffness and the modal performance,but also can make the weight reduce by 28.44 % as well as the absorbed energy in the crash increase by 3.07 %.In addition,the robustness of the door system has been improved.This method has high engineering application value.

As a new type of sensor material,Magnetically Controlled Shape Memory Alloy (MSMA) has high sensitivity,fast response,high energy density and so on.On the one hand,the researchers have not yet a unified understanding for the relationship model between the temperature and the magnetic induction intensity,so that they are unable to determine the effect of temperature on the magnetic induction intensity;on the other hand,the magnitude of magnetic induction intensity changes determine the characteristics of sensitivity,thus the application of MSMA material is limited in the field of ultra-precision sensor.On the basis of analyzing the existing methods of curve relationship model,the relationship model between temperature and magnetic induction intensity is solved by polynomial regression method.The results show that the fitting accuracy of the model is very high,which proves the feasibility of the polynomial regression method.

Based on the temperature and driving characteristics of the shape memory alloy,a kind of shape memory alloy temperature control switch is designed.The temperature control switch of the shape memory alloy can sense the external temperature and automatically adjust the temperature resistance with the change of the temperature,thereby changing the size of the output current and realizing the intelligent control of the switch.The working principle of the shape memory alloy temperature control switch is introduced;based on the thermodynamic properties of shape memory alloy,the relationship between temperature and output stroke,temperature resistance is established;based on the principle of temperature control,the design equation of the temperature controlled switch resistance wire is established.The relationship between output stroke and temperature of shape memory alloy spring is analyzed through experiment.The case results showed that with the increase of temperature,the temperature control stroke increases,for temperature rise type shape memory alloy temperature control switch,the output current increases with the increase of temperature,the temperature drop type shape memory alloy temperature control switch,the output current decreases with the increase of temperature.

Regarding the cognitive gap between the user and the category architect,the mental model with its advantage of symbolic knowledge structure was used to study the design and implementation of the directory navigation in the robot business platform.Based on the mental model of symbolic representation,the mapping mental model in web pages was realized,and the inconsistency between the site directory navigation performance model and the user’s mental model were analyzed.Furthermore,the directory navigation module of robot business platform is designed and implemented based on mental model.By improving the design of directory navigation in the robot business platform,the speed of finding the desired commodity could be increased,the user experience could be improved,and the stickiness of user could be enhanced.

To improve the response speed and anti-jamming ability of the SCARA rotot when moving rapidly.Based on the traditional PID servo controller,the fussy control theory was used to design the servo control as a fuzzy-PID controller.The fuzzy PID controller was studied with simulation on the MATLAB platform.The performance indexes and the anti-jamming abilities were analysed and compared between the two controllers.The results showed that,under the effect of step signal,two kinds of controllers could better accomplish signal tracking,while the overshoot of fuzzy PID controller was smaller than PID controller.When considering the effect of periodic excitation,PID controller would occur oscillation,while fuzzy PID could still maintain a better signal tracking;In the process of five times polynomial trajectory tracking,two kinds of controllers could effectively accomplish.When considering the effect of nonlinear joint friction,PID controller trajectory tracking was offseting,but fuzzy controller actual trajectory can still maintain to be consistent with the expected trajectory.

To solve the component supplier selection problem of manufacturing enterprises,a selection optimization approach is proposed.Firstly the evaluation index is divided into quality factor,supply performance factor,economic factor,cooperation factor and environmental effect factor.Secondly a fuzzy-rough method is constructed by using trapezoidal fuzzy number to represent the expert score and using rough number and rough boundary interval to calculate the index value of suppliers.Then entropy method is used to achieve the adaptive weighting of evaluation index,and the improved TOPSIS replaced Euclidean distance by Kullback-Leibler divergence is finally used to sort the weighted index values of suppliers lastly.An enterprise application example is given to illustrate the correctness and feasibility of the proposed method.

The peak deceleration extracted from new car crash test and the deceleration of pedestrian shanks were regarded as constraint variables when defining optimization problem under double standards.Let the specifications and the foam strength of buffer beam,front longitudinal beam and buffer coating as design variables,the quality of vehicle front structure was carried on optimization design by the validated vehicle truncation’s finite element model.The optimal Latin hypercube experimental design and radial basis function method were used to create the approximate model of constraint function,the objective function was constructed further and the optimal solution was obtained through genetic algorithm.Results showed that the design size obtained by the optimal solution made the quality of vehicle front structure significantly reduced,and met the double requirements of vehicle front head-on collision crashworthiness of rigid obstacles and pedestrians collision safety stipulated by the relevant regulations at the same time.

On the basis of research and development of anti-collision beam system,a conceptual design of anti-collision beam system for a commercial vehicle was carried out,and a FE model was created for low-speed frontal collision with 100% rigid barrier.And using orthogonal experimental design to systematic analyze the factors which influence the energy-absorption characteristics of anti-collision beam.The factors are the section of bumper beam,the section of energy absorbing box,the inner plate thickness of energy absorbing box and the outer plate thickness of energy absorbing box.Using the range method and the comprehensive balance method to selected the best combination of energy-absorption characteristics which with low maximum collision force and small compression displacement.Finally,explore the distance of induced groove which influences the energy-absorption characteristics.The results indicate that the final combination has better energy absorption capacity and meets the requirements of collision force.

Miner theory and load spectra are used to improve the rationality of the reliability enhancement test and the fatigue life of the transmission is assessed in different enhancement test.And the reliability enhancement coefficient of the enhanced road test and indoor enhanced simulation test is obtained.No matter before or after processing,the damage value of load spectrum is consistent,and the time is greatly decreased.The results show that the concentrated load spectrum can predict the fatigue life of the products quickly and efficiently,and provide a basis for the enhancement testing of their reliability.

The load critical point is an important factor in the fatigue failure of the truck chassis.Analyzes the critical buckling load of the truck chassis by the arc length method,and tests the two critical types of stainless steel instead of the conventional steel in the critical point of the truck chassis.Finite element software ABAQUS is used to analyze the stress critical point which may cause fatigue failure.The results obtained from the linear analysis of buckling show that the changing material of the chassis does not bring about a large change in the value of the critical load.The results after buckling show that a very small imperfect value results in a significant reduction in critical buckling loads.The experimental results show that the displacement of the pressure point and the magnitude of the stress are very important when the conventional steel is used in the chassis.The displacement of the pressure point and the magnitude of the stress may cause fatigue failure of the chassis and reduce the life of the chassis.

Search mechanism is comprehensive improved by using the advantage of Particle Swarm Optimization(PSO)algorithm and Genetic Algorithm(GA)aiming at the problem of slow convergence and poor convergence accuracy of artificial bee colony algorithm.Benchmark functions show that the convergence speed and accuracy of the algorithm improved obviously.On the basis of the algorithm,designing the composite power electric vehicle FSM-Fuzzy layered energy management strategy,the fuzzy control strategy membership function size and ship are closed-loop learning by calling for the Advisor software.The result shows:under the UDDS and SC03 condition,the energy consumption can still reduce 8.36 % and 8.58 % under the strategy learned by the improved artificial bee colony algorithm.

An automatic programming system for electrodes based on UG OPEN and ODBC was developed.A Generalized Knowledge Data(GKD)base including case sub-base,tool sub-base,process parameters sub-base and operation parameters sub-base,which can be queried,modified and maintained,was created.Aiming at electrodes with special characteristics,some special programming templates for NC milling were built.When program,the case matching was firstly applied for electrodes to be milled,manufacturing knowledge was then called from the GKD according to the real milling environment,the milling program was obtained in the end.High machining efficiency and good machining effect were achieved when the system was applied in the actual cases.

Aiming at the shortcomings of objective evaluation method of seat comfort,chooses a commercial vehicle seat,in order to build the simulation model,the H-point measuring device is used as the dummy,and the seat design angle is acted as the reference.Based on the ideal distribution of body pressure,the seat comfort is evaluated by the simulation results,and the experimental results are validated by four objective evaluation indexes:maximum pressure,average pressure,contact area and weight ratio.The results show that the body pressure distribution is close to the ideal body pressure distribution for the main contact area of the seat,and the value of the body pressure distribution of shoulder,waist and thigh is close to the experiment and simulation.The simulation model can accurately reflect the HPM-seat interface key parts of the distribution characteristics of body pressure.The modeling method can establish a standard range of objective evaluation indexes for seat comfort,and provide guidance for the design and development of seat.

According to the characteristics of air compressor crankshaft machining workshop,“One-Piece Flow” cell production mode and Flexsim simulation were adopted to solve the production line layout problem.The original layout of workshop of the simulation model is established by Flexsim,found unreasonable phenomenon and proposed improvement strategy.Then combining the “One-Piece Flow” cell production mode,determine the optimal facility layout scheme.Example analysis shows:the combined “One-Piece Flow” cell production mode and Flexsim simulation can reduces the stock of semi-manufactured goods and improves production efficiency.

The feeding device is the key part of the gas-solid mixing in pneumatic conveying system.The change of the pressure loss and the conveying efficiency of the whole system will be caused by particle collision in feeding device.Based on the condition that two-phase in feeding device under the particle collision has dual nature of particle discrete phase and gas continuous phase,a coupling numerical simulation of the gas-solid two-phase flow in a feeding device has been perforemed with the help of the Fluent and EDEM software by using the CFD-DEM coupling method,focusing on the research of the pressure distribution characteristics under the particle collision.By comparing with the simulation results of CFD,analyzes the variation law of pressure characteristics under the condition of particle collision.The results show that the particle collision in feeding device mainly affect the characteristics of pressure changes in the gas-solid mixing stage,and will reduce the pressure loss in the pipeline,promote the uniform of outlet section dynamic pressure distribution,and improve the overall conveying efficiency.

Micro parts and components of high elastic alloy are widely used in industries of aeronautics and astronautics,precision devices and so on.To solve the problem that these parts and components are difficult to machine with traditional machining methods,nanosecond-pulse micro electrochemical milling machining technology was applied to machine micro parts of high elastic alloy.Firstly the principle and set-up of micro electrochemical milling machining technology were introduced.Then an online-making method for micro electrodes and effects of main process parameters on machining precision were studied.Two typical micro parts were successfully machined with this technology.Experiment results show that micro parts of high elastic material can be machined with nanosecond-pulse micro electrochemical milling machining technology,and these parts are of good quality.

As a major part in the quartz flexible accelerometer,coil is always thin-walled and precise.Especially for the coil made of beryllium,the abnormal hole is relatively difficult to be milled because of its low rigidity.Great deformation and even fracture are regularly happening in the machining of beryllium coil.Through the Finite Element Method (FEM) and experiments,the deformation law under auxiliary supporting is achieved.With this technic,great deformation and fracture are effectually controlled and high quality manufactures are brought out.It is significative for improving the precision and stability of the quartz flexible accelerometer.

Single blade helix end milling can be regarded as oblique cutting,analyzing the cutting process based on equivalent plane method is more in line with the characteristic of oblique cutting .In the equivalent plane,the oblique cutting is converted into two dimensional orthogonal cutting:the equivalent rake angle,equivalent clearance angle,equivalent cutting edge radius are deduced,the tool parameters obtained from the formula are used in the two dimensional model,and the two dimensional orthogonal model based on the equivalent plane is established.The simulation results are compared with the simulation results of the two dimensional orthogonal model based on the main section,it is found that there are some differences in the cutting force and chip morphology between the two models,the results show that converting oblique cutting into two dimensional orthogonal cutting base on equivalent plane will affect the accuracy of the simulation results.The modeling method based on equivalent plane can provide a reference to the optimization of 2D simulation modeling of oblique cutting.

Analyzed the material properties of 0Cr18Ni9 expanding of aircraft landing gear,use ELITE Plus 8/51M CNC lathes,YX32-250T hydraulic machine,heat treatment furnace for try making products,and tensile test was conducted by CMT6503 computer-controlled electronic universal testing machine,to seek optimal manufacturing process of expanding of aircraft landing gear.According to the test results,improved product design defects,determined the solution treatment,formulated the optimal production process of 0Cr18Ni9 expanding.The experimental results show that the process measures effective,and the passing rate of 100 % after the trial expander stretching verification.

According to the actual manufacturing process of twist drill,the method of generating the rake face by using UG software to replace the helical groove truncation in the plane of helix method of twist drill was introduced.Based on the principle of conical grinding method,and the mathematical model analyzing of the flank face of twist drill,the main cutting edge and transverse edge of twist drill were determined with a two-way natural intersecting method,the twist drill flank face was established by using UG software,and the three-dimensional modeling of twist drill was completed.This modeling method can not only generate more realistic three-dimensional model of twist drill,but also effectively avoid the errors caused by artificial selection of the main cutting edge,which is of great significance for the subsequent analysis of the performance of twist drill.

Based on the analysis of the requirements of textile vamp printing machine,the cam frame lifting mechanism designed for printing machine,to improve the efficiency of the printing machine.According to the principle of reverse design of the cam,a mathematical model is established for the cam profile curve,which is applicable to the law of the motion of the cycloidal motion curve.The displacement,velocity and acceleration theoretical curves are designed by using MATLAB software based on the law of the motion cycloidal motion curve,and in the multi body dynamics software ADAMS input model and add constraints,the displacement,velocity and acceleration simulation curves of the cam putter are obtained.Finally,the optimization mathematical model is established to obtain the global optimal solution of the maximum pressure angle and the corresponding cam angle of the cam lift mechanism.The results show that the kinematics curve designed in MATLAB is basically consistent with the motion curve which is simulated in ADAMS,and it is proved that the kinematics curve designed by MATLAB is reasonable,optimization of the maximum pressure angle of 7.737 1 degrees,corresponding to the rotation angle of 72.298 9 degrees,the results show that the design of the cam curve transmission efficiency is high,meets the technical requirements of the textile upper printing machine.So it can be seen that the design optimization is feasible and has been applied in practical production.It has a higher practical value of application.

The mechanical performances of joint interfaces which with different surface roughness are studied through cyclic compression experiments.And the distributions of the maximum indentation depths and plastic works along the layer depths are tested based on the Instrumented Indentation Test(IIT).In addition,the stress strain relationship and the contact mechanism of joint interfaces under cyclic compression loading is explored.Compared with the continuum model,the joint interface makes the stress-strain relationship nonlinear.The plastic deformation and plastic accumulation are detected occur below the interface based on IIT,and the plastic zone and uneven stress zone formed.Under cycling loads,both the plastic deformation and the uneven stress zone increase.It also demonstrate that the compressive stress increments and the plastic deformation increments increase with the increasing of surface roughness.Reveals the nonlinear characteristics and the plastic deformation mechanism of the mechanical joint interface,which lays experimental basis for the joint interface stiffness theory.

The electromagnetic launch technology has shown a great potential application in the industrial equipment.In order to solve the problem that the weft insertion is difficult in the development of the super width loom,the weft insertion method based on the electromagnetic launcher technology for the super width loom is proposed innovatively.The clip weft device motion model is established on the basis of weft insertion process requirement.Analyzes and designs the structure of the electromagnetic launch weft insertion mechanism,the analysis and calculation model is established for the initial launch velocity,electromagnetic launch force and the weft insertion mechanism structural parameters,mainly including coil number of ampere turns,launch current,coil length etc.During experiment,the electromagnetic launch coil length is 500 mm,the initial velocity is 65 m/s,reached the expected design target.

In the strong noise environment,the fault feature information of rolling bearing is very weak and difficult to be extracted,propose the Variational Modal Decomposition (VMD) and the Minimum Entropy Deconvolution (MED) method to extract fault feature of rolling bearing.Firstly,VMD was used to decompose original fault signals into several components.Due to influence of noise,it is difficult to extract the effective fault feature information from the component.According to the correlation coefficient criterion,selecting the bigger correlation coefficient of component with the original signal to reconstruct,and then the reconstructed signal is processed by the Minimum Entropy Deconvolution(MED).Finally,the processed signal is analyzed by Hilbert envelope.The fault characteristic frequency can be extracted accurately from the envelope spectrum through the analysis of the experimental data,the results show that the method can effectively reduce the influence of the noise,and accurately realize the extraction of bearing fault feature information.

For existing problem of uneven spraying of mortar machine circle nozzle,a new kind of non-circle nozzle was designed.First,the speed changes and volume fraction changes of nozzle flow field were obtained by the CFD software Fluent and the Eulerian model in multiphase flow.On this basis,nozzle was optimized according to variance of speed and volume fraction.Then,more appropriate compressed air angle of incidence,number of compressed air inlet and tip of the nozzle length,width and thickness were selected.Finally,the nozzle structure to meet the requirements of automatic wall plastering machine was obtained.Finally,an optimized model sample made by 3D printing technology was test to verify optimized results.This study has important reference value for future optimization of nozzle of automatic wall plastering machine.

In order to lessen complication and additional trauma from conventional repairing solution,autologous bone grafting,the preparation method of bioactive substitute is presented.The key of prosthesis technology is bioactive substitute can improve pathologic organ function and structure.Based on reverse engineering and UG secondary development,Mimics medical image software was used for bone shape by reverse modeling.Then import the model into UG,process entity,generate mesh,and simplify analysis.And then,the structural model of porous artificial bone tissue was calculated and gained by programming language.Finally,taking the structural model as the mould,according to the rapid prototyping theory,artificial prosthesis with biological activity was produced by the rapid prototyping machine.