Taking the pressure relief process of pneumatic jetting valve as the research object,the two-dimension model of coupled system of pressure relief process and needle motion process were putted forward,the unsteady flow field was calculated by finite volume method and dynamic mesh with the turbulence k-ε model,then the pressure relief curve of back pressure zone and needle motion curve was achieved.The results show that the jetting performance is limited for great back pressure resistance in jetting.By reducing pressure relief airway length or increasing pressure relief airway diameter,the needle speed can be increased and the needle motion response time can be reduced.The calculation results are consistent with those of experiment,which illustrates a new way for calculation and analysis of pneumatic jet dispensing and provides reference for structure optimization of the valve.

Based on analysis of the magnetic grinding mechanism and the permanent magnet pole structure draw the shape of the pole surface is the key factors which impact of magnetic field distribution and magnetic abrasive quality.Magnet pole is simulated by ANSYS,and distribution of the magnetic field lines and magnetic field intensity were comparatively analyzed.It is concluded that when the ratio of the radius of removal material and bottom material is 1∶3 and the ratio of rectangular slot depth and width is 1∶1,the magnetic field strength generated by the processing area can reach 0.85～1.2T.This design method based on the simulation software provide a theoretical reference for design of magnet pole.

Due to many kinds of parts and tools,included in Mixed-Model Assembly Systems(MMAS),have not a reasonable layout criterian,and almostly consider workers’ physiological property and cognitive habits,which affect the assembly efficiency of MMAS,raising the layout solutions of tools and parts based on the ergonomics.The common layout solutions are regarded as research contents.Those solutions include single layer and double layers.One kinds of them has disconnected layout and corresponding layout about tools and parts.Using mouse to choose the model of tools and parts,and move them to the fixing position.The research results show that in the double layout the people’s manipulation time is lowest when those models are positioned in the best visual area,and the assembly efficiency is higher.In addition,the way of tools and parts’s corresponding layout in the best visual area has the same assembly efficiency.Lastly,checking the rationality of results of the experimentation by MMAS simulation experiment.

For the vehicle’s low efficiency,high emissions and high fuel consumption problem by idling operation at low vehicle speed in city driving,adopting idling start-stop system to save the fuel and reduce the emission of the city vehicle were studied.The controlling principle,electronic control unit and control strategy of engine idle start/stop system are elaborated,the dynamic model during engine starting process is constructed.Then the control strategy model for carrying out engine idle start/stop is built with Matlab/Simulink,and a co-simulation with Cruise software is carried out to conduct comparative analysis on the fuel consumption and emissions between the vehicle adopted by start/stop technology before and after in NEDC and Japan-mode urban driving-cycles.The simulation results show that the HC,CO and NO_x emissions of vehicle adopted by start/stop technology are declined obviously,fuel consumption adopted by start/stop technology is reduced significantly.The simulation results prove that the designed co-simulation platform and control strategy are feasibility and useful.It will have important theoretical significance for the development of vehicle start-stop control system.

In complex Programmable Logic Controller (PLC) control system,traditional flow sheet is very hard to describe complex events such as concurrent,coordination and competition.It constructs models of Liquefied Natural Gas (LNG) cylinder line production control system by using the ability of Petri nets in graph and model.Through hierarchical model and analyzes,potential problems are eliminated such as deadlock and conflict.Logic expression is listed based on Petri net’s condition of transition and change of place.It makes a connection between logic expression and PLC Ladder Logic Programming Language (LAD).According to the Petri net’s model,PLC program can be designed clearly and readably.Through practical operation,the system is stable and reliable.

For improving the efficiency of cluster tools availably,the issues for processing different types of wafers concurrently in single-armed cluster tools are studied.A Petri net model describing the process of the single-armed cluster tools precisely,which is independent of diverse wafer flow pattern,is developed.Some equations,which define that the single-armed cluster tools is capable of performing a steady and cyclic operation under mixed wafer flows,are derived based on backward and cyclic scheduling strategy.Furthermore,the linear programming model is established and a periodic steady-state schedule is obtained as well.The presented scheduling is executed by the means of virtual wafer and the Gantt chart of scheduling is provided.Finally,the validity and efficiency of the proposed model and scheduling is verified.

Branch is one of the important issues in mechanism synthesis and design.Based on the concept of Joint Rotation Space (JRS),presents a simple method for the branch identification of a two-DOF seven-bar planar linkage.The JRS,branch curves,the characteristics and the formation of branches are also discussed.The branches of the two-DOF seven-bar planar linkage can be classified into two categories,which can be automatically identified with computer-aided program.Using the software of VC++,the algorithm can be implemented and the branches of the seven-bar linkage can be visualized with a simplified graphical image.All the mobility information can be easily obtained from the developed software.Hence the branch can be automatically identified.It provides a good tool for the design of two-DOF seven-bar linkages and manipulators.

Aiming at the phenomenon of the axle box spring fracture of passenger train,applies the three dimensional software to model the parameterized axle box single coil spring,and analyzes the performance of spring caused by the gaps between the support circle and effective circle through ANSYS software.The strength,stiffness and fatigue strength of spring were calculated in Workbench system,which concluded that these performances can met the design requirements of spring.The first ten order modal vibration modes and their corresponding natural frequencies data of the axle box spring were obtained by modal analysis,and analyzed the modal vibration modes and frequency data can avoid the resonance phenomenon from axle box springs and frames.The parametric modeling method and analysis result can provide theoretical reference for designing the other axle box spring of high-speed trains.

Q & P steel is a 3rd generation advanced high strength steel with high strength level and excellent plasticity.It has a wide range of applications in the lightweight of BIW.It is found that the QP980 has a better mechanical performance than the common high strength steel by single tensile and OM test.By using the analysis of load transfer path,the parts which are suitable for using QP980 can be chosen.The lightweight of the body is achieved through the optimization design of these parts.Use the FE analysis to obtain the frontal impact performance of the vehicle and verify the feasibility of the use of QP980 parts in the body and make the further verify through the real vehicle crash test.

Based on the active collision avoidance distance model,it is assumed that the car in the current traffic conditions for safety lane change,forecast the distance between the vehicle and the target lane after the end of lane change,so as to determine the model of warning system for vehicle lateral safety warning system.By simulation,it is proved that the lateral safety warning model established by this method is correct.

A lumped parameter model was proposed for the analysis of the dynamic behaviour of 3rd HEM.The measured static and dynamic performances of the 3rd HEM are given.The experiments are made for the purpose of validation of the 3rd HEM.It was shown by comparison of the numerical results with the experimental observations that the present 3rd HEM achieves fairly good performance for the vehicle industry.

A 3D graphic method which reverses to acquire its prototype from the images is studied.Perspective space which is based on SolidWorks,imports the prototype photos,by setting the image contour key points for the perspective of the vanishing point,thus it builds up the geometric relation,and then establishes the line of sight and image and reverses out the prototype.3D graphic method is more intuitive and efficient than 2D one;the deductive method of "stroke" will simplify a more professional graphic method and turns it into a common stroke operation.

A method for product design based on Catmull-Clark(C-C) subdivision technology is proposed.Firstly,the designer provides a basic simple mesh model of the product with the vertex editable.Then,the vertex’s position can be modified by not only the designer,but also the users.Finally,the mesh is subdivided and a new product solution is obtained.This method based on subdivision technology,has more faster execution speed and small amount of computation.What the designer need do is only to create a simple product mesh,then the rest work was done all by users.This method is easy to conduct,and can obtain customized product form solutions,which is able to make the design process more efficient.

Column is the important supporting part of the vertical machining center,which the performance has significant effect on the processing quality,reliability,stability and other index of the machine tool.The entity model of some vertical machining center column is established by SoildWorks software,which using ANSYS Workbench software to make static analysis and modal analysis in typical working conditions.Besides,harmonic response analysis of the column is carried out,the result of analysis coincides with modal analysis.One and two order natural frequency is low,which arousing resonance phenomenon easily,and it is necessary to optimize the structure.The mathematical model of dynamic-static characteristic topology optimization is established by compromise programming method and average frequency method,the multi-objective topology optimization design is performed by using ANSYS.It provides a technical way for the optimization goal of improving the dynamic and static performance and reducing weight of the machining center.

The development of complex mechanical products have the characteristics of knowledge intensive,knowledge reuse plays an important role in the development.Researched on the easily ignored process knowledge in the whole life cycle of mechanical products,buildging process knowledge ontology based on the whole life cycle and structure of the product,to refined the large-grained ontology to knowledge tree which contains knowledge nodes and knowledge points.making the design process knowledge to a model which is corresponded to knowledge tree,then reuse the whole life cycle design process knowledge by knowledge tree navigation and keywords retrieve which meet the needs of different level of developer.Taking the grab for example,developed the process knowledge reuse system of the whole life cycle based on knowledge tree navigation,prove that the method is validated.

The connecting device of converter is one of the important parts of converter system.In order to find out the stress variation law and dangerous point of the connecting device,taking 120t of converter connecting device as the research object,using UG to the whole of converter modeling and calculate the tilting moment under different angle,determine the three types of extreme working conditions and the overall analysis of the converter using ANSYS Workbench,to find out the stress variation law of the connecting device,and intensity analysis of main parts of connecting device,comparison of theoretical analysis and finite element analysis.The results show that:theoretical analysis and finite element results are consistent,the stress transfer in the connecting device is not uniform.Analysis of the stress variation law of the connecting device and put forward improvement measures,provide a theoretical reference for the optimization and improvement of converter connecting device.

In order to meet large data management,collaborative design and manufacturing requirements based on the latest status for aircraft pedigree product,design,process and manufacturing configuration are proposed for complex structure product.Using the design,process and manufacture configuration matrix,the design,process and manufacture scheme of the same pedigree and different state aircraft product are described respectively.Effective principles of all configurations are presented.Based on the effectiveness management of designs module and design example,the effectiveness of design configuration is controlled.The effectiveness of process configuration includes the effectiveness managements of relationship between process and assembly subsystem,process instance and assembly component.Through the effective management of assembly parts and instruction documents,the effectiveness of process configuration is controlled.Using the presented design,process and manufacturing configuration matrix and principle of effectiveness,models of design,process and manufacturing configuration are built.Finally,the presented configurations are used in a pedigree advanced trainer aircraft.The engineering application shows that the presented configurations are suitable for data management of complex structure product.

A theoretical model is proposed to predict the temperature distribution of tool-chips contact area in dry cutting 45 hardened steel.In homogeneity of heat flux density and the rate of heat distribution between of tool and chips are considered in this model.Temperature distribution of tool-chips contact area was studied based on the relevant cutting experiment and the model.Results show that the calculation results basically agree with the experiment data,the deviations are less than 3.26%.The temperature field distribution distribute with uniform gradient in tool-chips contact area.It is almost not influenced by cutting speeds that the position of maximum temperature is near the end of adhesive friction area in the centre of tool-chips contact area,the position of minimum temperature is near the edge of tool-chips contact area.The model is accurate,simple,which can provide a theoretical basis for future development of new tool,reduction of tool wear,improvement of processing quality and efficiency.

The tool rack is the essential of the precision machine of light guide plate mould.Designed a tool rack based on piezoelectric ceramic and jointed by flexible hinge.The flexible hinge was analyzed and optimized by the theoretical calculation and finite element analysis software,and the device has been physical processed and tested.The results indicated that it could reach a travel range for 40μm and the frequency response could reach 80Hz within 35μm travel range.The experiment results demonstrated that it can process the dot with diameter of 40μm.

To improve the accuracy of determine and correct the material constitutive model parameters from finite element simulation,it needs to clear that how the changes of the model parameters affect the cutting process simulation results,the orthogonal cutting model of machining 45 carbon steel was established by using AdvantEdge FEM software,the custom defined material model was used to vary the level of each parameter in Johnson-Cook(J-C) constitutive model,and then the effects of each J-C parameter (A,B,n,C,m) on cutting forces,chip morphology and residual stresses were studied.The simulation results show that cutting forces changes little at first and then increase sharply as the parameter C increases,and increase linearly as the other parameters increase;chip morphology becomes thinner when A and C increase,but becomes thicker when n and m increase,and changes little as B increases;the maximum residual tensile stress,compressive residual stress and its depth are more sensitive to C and m,A and n,C,respectively.

Considering the mechanics characteristics of AISI 4340 during micro scale machining,a constitutive model of AISI 4340 for micro milling is set up based on the Johnson-Cook constitutive model and strain gradient plasticity theory.And the simulation model of micro milling tool which made by cemented carbide is also built.The Arbitrary Lagrangian-Eulerian (ALE) adaptive grid technique is used to simulate micro slotting.The forces during micro slotting are obtained under different spindle speed and feed rate.The correctness of AISI 4340’s constitutive model is validated by comparing the predicted micro milling force with the corresponding experimental data.It provides the foundation for the further research of micro milling.

The Shewhart control chart,which is based on the 3σ principle is often used in the detection of motorcycle flasher flicker frequency,but the classic Shewhart control chart is not sensitive to small drift in the frequency.Small drift when it happens,will leads to the result that the adjustment of the frequency of flasher flicker is not in time.Control the changes of the frequency of the flasher flicker by using CUSUM control chart as a result,it can timely detect the flasher flicker frequency of small drift,improve the efficiency of control chart,ensure product quality and reduce the product cost.

A new buffer with controllable percussive force,of which the concussion spring is connected to the piston of the cavity,is discussed.When collision occurs,the spring will move in a limited way while compressing to absorb forces,which prolongs the time of collision,reduces the percussion force and thus improve the ability of force absorption.The study shows that the percussion force on the buffer can be controlled by changing the area of discharge orifice on the end of the cavity.The principle of this buffer can be used to realize the control over the percussion force within a default.

Phosphating is an important process in automobile coatings,phosphating solution temperature on the formation of a good car paint,play a crucial role.The system consisted of WinCC monitor,water-tank and PLC.The system has realized the measurement of PT100,temperature of solution temperature of solution of PID constant control,heating rod working duty cycle adjustment.This system not only greatly improves the automation level in the actual production line and realizes the remote control but also realizes the simulation teaching.This system has its own economy value,and it can save the teaching cost,it’s a typical combination of practical application and teaching case.

Taking a certain tower crane as the research object,and using finite element software ANSYS to analyze its static strength and stiffness,the result shows that the static strength and stiffness meet the design requirements.Using the nonlinear finite element method,considering material nonlinearity and structure geometrical nonlinearity,comparative analysis was done between different connection form of tower body.The result shows that the connection form has little effect on static strength and stiffness of tower crane,the maximum deviation was less than 5%.With the increase of tower height,the effect of structure geometrical nonlinearity will increase for horizontal static displacement of tower crane.At maximum independent height,the calculated deviation between linear solution and nonlinear solution close to 20%.Therefore,it can be concluded that the calculation considering structure geometrical nonlinearity will more accurate when analyze tower crane’s static stiffness.

Introduced the working principle of planar movable stereo garage,analyzed the advantages and disadvantages of the existing planar movable stereo garage.Researched and put forward the structure scheme of a new type of high level planar movable stereo garage,introduced the structure form of car carrying board,conveying trolleys,automobile rotary disk and elevating platform,expounded the principle of parking and taking car of high level planar movable stereo garage.When considered in three conditions of wind load,earthquake and earthquake with wind load,steel structures were static analyzed and dynamic analyzed by using finite element analysis software ANSYS Workbench to get the deformation and the stress.Compared with the safety factor and allowable stress of the steel structure to verify the overall stability of the steel structure scheme.

The discovery of fault information is conducive to improve the quality of fault diagnosis and the efficiency of fault diagnosis.Since fault information presented in the form of rough-up text description,in order to avoid waste of information resources,to make use of fault information fully and effectively,according to Dealer Management System(DMS) data of pickup,fault information mining machinery is built by production representation method based on semantic description.It is used to analyze fault information.Uncertainty reasoning of credibility is used to infer the parts that cause trouble and to verify the reliability of rule conclusion.

In view of the leakage failure of a heat sink cooling pipe,a finite element analysis method is used to analyze the dynamic stress of the radiator.Using CATIA to establish three-dimensional model of the radiator,the heat sink finite element model is built in HyperMesh,and the correctness of the finite element model is verified by modal test,and the dynamic response of RADIOSS is used to solve the model.The research shows that the position of the maximum stress in the heat sink cooling pipe is in accord with the actual leakage point of the fault radiator,and the failure of the radiator cooling pipe is due to the stress caused by the vibration of the heat sink.Through the improvement of the original structure of the radiator,the maximum stress of the radiator cooling tube is decreased by 42%,and the service life of the radiator is improved.

Remanufacturing technology with high quality, high efficiency, energy saving, material saving and environmental protection, it is becoming a new direction for the future development of green manufacturing industry. To the remanufacturing products, the blank crack, coating layer crack and interface crack are the most common crack defects. These crack defects have a great influence in the quality of remanufacturing products. The propagation and coupling effect of these crack defects in remanufacturing products is still unclear.The rapid development of numerical technology provide an effective way to research these problems. Details the research progress in finite element simulation of crack propagation, and points out the difficulties of appling the numerical simulation technology to the crack propagation research in remanufacturing products. Furthermore, the development direction of this kind of research is pointed out.

Focuses on the structure characteristics of the complex surfaced integral impeller parts.Introduces the difficulties during its manufacturing process.It also describes the development of the manufacturing technology in complex surfaced integral impeller parts.Based on a large amount of study review and the actual production of accurate manufacturing technology of integral impeller parts,Discusses the research status of the key technologies covering tool axial control,deformation control,tool innovation as well as cooling lubrication.It leaves guiding significance on studies of improving manufacturing accuracy in complex surfaced integral impeller parts production.

Simply introduces ultrasonic aided electrochemical machining,ultrasonic assisted electrical discharge machining and ultrasonic assisted laser beam machining,it states their processing mechanism,advantages and application.and prospects the future development trend of the ultrasonic combined processing technology.