In view of powertrain parameter matching of Fuel Cell Electric Vehicles (FCEV),a multi-index parameter matching design method of the powertrain was discussed based on the goal of optimizing the vehicle dynamic performance and economic efficiency.In order to accelerate calculation of economic performance,the fast dynamic programming algorithm was proposed.By narrowing the search domain and dimensionality reduction,the time of calculation was shortened from 393.33 minutes to 12.52 minutes.Taking dynamic and economic performance as indicators,the range of the powertrain parameters was preliminarily determined.Then the orthogonal table was designed based on orthogonal optimal design theoretic.The results show that according to the parameters designed,the dynamic and economic performance are obviously improved compared with the original vehicle.

Arc shape phenomena is normal during three dimensional scanning milling of micro-electrical discharge.Introduces integration erosion mechanism of electrical pulse discharged on both positive and negative poles.Typical hollow electrode is applied to do some simulative analysis.Then,real experiments have been done.There are two conditions for the electrode,rotating with 300 r/min and 0 r/min in the analysis and experiments.Finally,their profiles of tool electrode and workpiece are given.Results show that there are of different integration erosion effects on both poles.The difference is closely relative to some techniques parameters.

Vibration damping control of a complex vehicle suspension system consisting of fractional order MRF damping and nonlinear spring is studied.Firstly,the 1/4 vehicle two degree of freedom nonlinear suspension mathematical model is established,and then combined with the fractional calculus theory,the PID controller is designed.The genetic algorithm is used to adjust the parameters of fractional PID controller online,in which the vertical acceleration,suspension dynamic displacement and tire dynamic deformation are taken as the optimization indexes to establish fitness function.At the same time,the performance simulation experiments of fractional order PID control,integer order PID control and passive control for nonlinear suspension are carried out in Matlab/Simulink.The results show that the fractional order PID controller with online tuning of genetic algorithm is better than passive suspension and integer PID control.It shows that it is effective to control the suspension when both fractional dampers and nonlinear springs are included.

A new type of obstructed piston-type particle damper is proposed.Establish the theoretical model of damping force of the particle dampers.The experiment is carried out by LMS Test Lab software.Study the influence of the particle size,excitation frequency and initial load on the damping characteristics and verified the accuracy of the established theoretical model.It is found that the damping force of the damper is monotonically increasing with the increase of the initial load,and the vibration reduction is the best under high frequency excitation with 0.7 mm particle size.

Taking the 205/55R16 tires as the research object,using Computational Fluid Dynamic(CFD) method to simulate the tire hydroplaning performance,the effectiveness of the hydroplaning model is verified by comparing the simulated value of hydroplaning velocity with the predicted value of National Aeronautics and Space Administration (NASA) hydroplaning equation.In order to improve the tire hydroplaning performance,learning from the theory of bionic non-smooth drag reduction,the pit non-smooth structure with rectangular mode is arranged on both side of the groove.The method of response surface analysis is used to optimize the four parameters which are pit top circle diameter,pit depth,downstream pit distance and spanwise pit distance.The mechanism of drag reduction is revealed from the point of view of flow field.Based on the above study,the optimal dimple structure is introduced into the whole tire hydroplaning analysis model.Compared with the hydroplaning performance of smooth wall tires,the results show that pit non-smooth could improve the tire hydroplaning performance by reducing the tread hydrodynamic pressure.

In the packaging outsourcing, in order to conclude a business, the contractor needs to bargain with the employer and to consider the risks from the random demand of customers and the random supply of the employer. Since the selling prices of both parties are private information in the bargaining, establishes a bargaining model based on Bayesian game and points out that there is an equilibrium price when the two sides reach the intention of cooperation. Then, constructing the expected profit function of the employer and the contractor in decentralized decision making, and model a Stackelberg game to get the optimal ordering and production decisions. Finally, proposing a contract combining shortage penalty and surplus purchase to coordinate the packaging outsourcing. Using the adjustment of contract parameters to achieve the purpose of coordinating packaging outsourcing decision.

Because the operation path of “water spider” is longer under the stack strategy,choosing it as the research object,based on the characteristics of “water spider” work.Regard the path planning of “water spider” under this strategy as Traveling Salesman Problem(TSP).Because the actual channel is horizontal and vertical line in the factory,choosing the sum of the Manhattan distance after the “water spider” move to all stages and changing the way to solve the TSP in Euclidean distance.Based on the improved genetic algorithm to optimize for it,introduced the reverse evolution operator to improve the local search ability,then using the Matlab to do simulation experiments.The results show that the algorithm can get the approximate optimal solution in path planning of the “water spider”.

The coordination problem of the manufacturer-led Service-oriented Manufacturing Hybrid Supply Chain(SMHSC)consisting of a single manufacturer,service provider and integrator is analyzed.Demand is influenced by the services efforts of service provider and market random factors.Based on the Stackelberg model,the coordination condition of the SMHSC with revenue sharing contract is discussed and found that the implementation of revenue sharing contract only cannot coordinate the SMHSC.Further,the cost-sharing model between manufacturer and service provider is built to achieve coordination among the three participants in the SMHSC.The results show that the effective option contract parameters must satisfy two linear relations and a certain range of values.Under such conditions,it is possible to ensure that all the SMHSC members obtain excess profits.

According to the Assembly Guidance Medium(AGM) is mostly formed by words,facing information islands and data gap,meanwhile,new aeroplane demands for validity and accuracy of AGM.After analyzed the function and architecture of AGM,presented the concept,built the framework of digital AGM.Based on 3DExperience(3DE),proposed the collectivity architecture to design digital AGM,designed the standard procedure of digital AGM for new areoplane assembly.This digital AGM is tested in the process planning and assembly guiding of a new areoplane,proved good effect.

According to the defect of artificial slag adding and slagging in the machine,a slag adding robot with real-time slag thickness detection and feedback control is developed.That is,on the basis of the open-loop slag adding robot,the laser ranging sensor is applied.Then the real-time information of in-mold slag thickness can be obtained.And the coupling relation of three factors: real-time slag thickness,mold work slagging speed and robot slagging rate is taken into comprehensive consideration.Therefore fuzzy controller is built to realize the fuzzy PID control of the slagging robot feeding electro-mechanical system and achieve the intelligent control of slag thickness in the mold.The simulation and application results show that the slag adding robot based on fuzzy PID control has good effect and quick response.It can realize the protection of slag on demand.

Based on the complex inspection environment of agriculture and forestry,a new wood inspection robot is created with design of its mechanical structure scheme and control scheme.The robot can achieve vertical climbing by lifting telescopic motion mechanism as well as the effect of the trunk clamp by the clamping mechanism.In the meanwhile,a kinematics analysis on climbing mechanism and rotation detection mechanism is conducted.Finally,through a series of experiments,the results show that the robot can climb up and down during detection of wood.It also can achieve continuously climbing and rotation detection function.Moreover,it will provide a clear image of the detection of wood without the shadow region.

Reconfigurable EOD robot on the spot can be reconstructed by operator according to the different spot task which has diversity when the robot in dangerous explosive environment.The modules of the robot can be assembled quickly is basic hardware requirement of self-reconfigurable EOD robot.And the software of the robot must auto-reconstruct to adapt to the robot hardware changes.Proposes an architecture of the reconfigurable EOD robot which is based on the Robot Operation System(ROS).In complex environment,operator assembles the modules of EOD robot for different tasks and the software system reconstructed its software modules,which enable the robot to handle multiple tasks.The reconfigurable EOB robot is efficient,robust and adaptive with this kind of architecture in actual work.

To satisfy the need of the automotive injection molding product production process control and quality traceability,by analyzing the technological process of the product,the whole function model of the system is established by using the IDEF0 modeling method,and the software of the production process control and the quality traceability system is designed.The system which using SQL database structure based on Client/Server to achieve the material on-line,product processing,product repair,product offline,product re-inspect and the quantity of the material and the integrity of production information be controlled,as well as the process flows control in the front and back of the process.Finally,the feasibility of the system is verified by the practical application on the oil mist separator.

In order to improve the utilization ratio of the material of the micro electric vehicle frame,the frame 3D model is built with Creo software and introduced into the ANSYS Workbench software,then the static and modal of the frame are analyzed and the structure of the frame is improved based on analysis results.The mechanical properties of the improved frame are verified and analyzed,and the stress is found to be large.According to the requirement of frame strength,the frame multi-objective driven optimization design model is established based on DesignXplorer,and the layout of the frame is analyzed,and the reasonable optimization scheme is obtained.Finally,the optimized sample vehicle dynamic performance is tested to verify the safety and stability of the vehicle frame.According to the analysis results,the quality of the optimized frame is reduced by 74.58 kg than that of the original frame,which is reduced by 27.74 %.The maximum stress of the optimized frame is increased by 15.42 MPa than that of the original frame,which is increase by 17.44 %,but that is still far below the yield limit of the material and in accordance with the requirements of the strength of the frame.

As the power of new aero-engine increases and the structure becomes more complicated,greater demands are placed on the turbine blade.Rigid and tough materials are widely used in the turbine blade in order to increase the strength and stiffness of the blade.The thickness of blade is thinner and airflow is increasing accordingly.The stability of the aero-engine working in the high temperature and pressure condition can be achieved.The blade of aero-engine tends to be more rigid,precise and thinner,so it is necessary to study on the five-axis simultaneous machining technology of the blade.

The meshing force between pin wheels and cycloidal gears with standard profile and profile modification is calculated.The meshing teeth is judged by distribution curve of initial gap.The parametric model of cycloidal gear and pin wheel is built.The finite element model of the cycloidal gear and pin wheel are built by ANSYS with the principle of segment the contact path.Finite element method is applied to perform tooth contact stress analysis of cycloid reducer including standard cycloid reducer and profile modification cycloid reducer.The maximum meshing force with friction is obtained from finite element analysis.The analysis result is compared to the theoretical computation results,and that would take a reference for the analysis of force on engineering.

It is necessary to analyze the vibration of each component of the cylinder in the green and lightweight design of cylinder.Viewed the loaded piston as a cantilever beam model,and then built the dimensionless dynamics equation of bending vibration during the protruding of the loaded piston rod.The results were compared with the whole process simulation results solved by LS-DYNA software,which proved the validity of the model and method proposed,and provided an effective analysis method for the design of cylinder structure.

At present,the domestic application of 1～5 t of demolition and removal of excavator machine tool head cut is still blank,and this kind of demolition cut tool head is one of the main equipments of domestic dismantling machine,these need to know its working mechanism to optimize the design.Therefore,it is designed a hydraulic dismantling machine on shear physical prototype,its structure was designed based on the physical characteristics and mechanical properties.The scissors body is gotten deformation nephogram and stress in a fixed load structure by ANSYS Workbench software.By analyzing the stress distribution of the scissors body and the causes of fatigue damage,it is found that the stress concentration is easy to cause fatigue damage to the structure at the handle, cutting edge and the front end of the scissors body.The structure and material of the scissors are optimized,and the replaceable kit is used for the first time.In the end,the results show that the optimized scissors have higher strength,more reasonable structure and longer service life.

The spring clutch is the key component of the helicopter transmission system,and it is found that its limit torque transmission capacity and failure form can provide the necessary basis for its design.Aiming at the problem of high cost and long cycle of experimental research on clutch torque transmission capacity and failure,The finite element analysis model of the spring clutch was established by using the finite element analysis method.The limit torque and failure form of the clutch under different interface friction,loading mode and speed were simulated.The results show that the increase of the interface friction can reduce the maximum stress of the spring,improve the stress distribution and improve the clutch transmission torque.The lower interface friction causes the spring clutch to fail,and when the interfacial friction reaches the excitation demand,the clutch will fail due to slip over the limit torque.

The cutting force can be calculated by cutting forces model,and it is the basis of predicting cutting state and optimizing machining parameters.The traditional cutting force model is based on the workpiece coordinate system.However,the way the cutting force expressed in tool coordinate system is more intuitive and effective when the research is machining deformation and vibration of thin-walled part or tool wear in multi-axis machining.On the basis of the traditional mechanical cutting force prediction model,the cutting force model of the tool coordinate system was proposed to predict the cutting force in tool coordinate system,and the cutting force coefficients calibration method based on tool coordinate system was proposed.Finally,the method of cutting force prediction model and cutting force coefficients prediction method are verified by experiments.The results show that the cutting force model proposed can accurately predict the cutting force in actual machining.

In order to investigate the influences of torsional stiffness inherent characteristics of face gear transmission system of four branches,the establishment of torsional stiffness and dynamic mechanics lumped parameter system model considering the meshing stiffness,the numerical solution method,dynamic differential equations of dynamic mechanics model for analysis of torsional stiffness inherent characteristics of face gear transmission system of four branch effect.The results show that the natural frequencies of the face gear four branch drive system have obvious four coincidence frequency phenomena;Stiffness in 0.4×10⁹ to 0.8×10⁹ N·mm^-1 changes,the natural frequency changes greatly,the torsional stiffness in the 0.8×10⁹ N·mm^-1 value on the inherent characteristics of the first 10 order of the impact of small.It can provide a theoretical basis for further optimizing the structure design of the face gear four branch drive system.

Plating CBN gear-honing-tools processing gear with standard involute,the general vicinity of the workpiece tooth pitch will be a “mid concave” error.For the form factor of the error is more complex,it is difficult to calculate errors with an exact analytical method.To this end,the use of Pro/E and ANSYS software,the contact analysis of plating CBN hard honing process was simulated and the equivalent stress of gear contact surface had been derived.Can find the stress concentration zone in the whole process,and we consider it is the concave error area.According to the data of this region,the tooth surface is optimized,and its stress concentration is reduced.By regression analysis,the maximum contact stress is reduced to the average of the whole tooth engagement process.In the production of plating CBN gear-honing-tools,the necessary tooth surface modification can eliminate or reduce the tooth profile error and improve the accuracy of the machining gears.The promotion of honing technology is important.

Taking the microhardness of machined surface as the evaluation index,the orthogonal experiment was carried out in high speed milling RoyAlloy mold steel,so as to analyze the influence of milling parameters on work hardening.The prediction model of work hardening is established by regression analysis method,on the basis of the significant test and comparison of the prediction results with the measured data to verify the accuracy of the model.

The traditional bottle defect inspection algorithm distinguishes and locates defects through edge detection and filtering,greatly affected by bottle illumination,and the rough burr area and defect part of the mouth are bright and difficult to distinguish in the image.As a result,the traditional algorithm requires extremely high precision for detecting thresholds.Therefore,a defect inspection algorithm is proposed based on the Histogram of Oriented Gradients (HOG) feature which has four-linear interpolation.This algorithm combines with the uniformity of the image gray value and the brightness mutation characteristic of the defect.Because of the large gray scale contrast between the defect and the background,the gradient direction histogram can be used to calculate the pixel gray value mutations of the bottle ring.During the statistical process,the gradient amplitude is amplified vertically and suppressed horizontally according to the gradient direction,forming a feature vector suitable for the inspection of bottle defects.The bottle defect detection method is combined with the Support Vector Machine (SVM) for two categories judgment.The experimental results show that the algorithm proposed has a higher accuracy compared with the traditional detection method.

In the face of the threat of air pollution and the greenhouse effect,the development and efficient use of green energy is very important.A new and efficient intelligent solar power supply equipment is designed.By skillfully arranging the photosensitive film on the solar panel,a servo automatic detection system is designed to measure the azimuth of the sun's light.This make it to automatically track the position of the sun's light and the sun shine directly on the solar panel.To realize the integration design of measurement,tracking driving energy efficient acquisition.Design a new bottom rotating structure with the equipment characteristics.The energy saving control method is designed,and the equipment is subjected to wind analysis.On this basis,topology optimization analysis is carried out on the side supporting plate based on variable density method,which makes the equipment lightweight and effectively reduces the lateral wind force,side plate weight reduction is 28.2 %,overall lateral wind resistance is reduced by 26.36 %.The strength analysis shows that the deformation of the side plate is small and meets the requirement of strength.Research shows that the structure of the equipment is ingenious,the expansibility is strong,and the solar panel array is easy to be set.It has a broad application prospect.

Taking the loader front driving axle torque load spectrum compilation of fatigue test as an example,the result which from the rain-flow counting of the effective measured data of different kinds of working conditions,has been synthesized according to the proportional coefficient of working conditions.The extrapolation of rain-flow matrix has been applied to extrapolating the torque load spectrum of working conditions synthesis.The whole life cycle of two-dimensional front driving axle torque load spectrum has been gained.The load spectrum of fatigue test and intensified fatigue test has been compiled.The torque load spectrum of the drive axle fatigue test can reflect the actual operation of the loader more realistic and effectively,which provides the basis for the anti-fatigue design and fatigue life prediction of the loader transmission system.Loading an intensified fatigue test load spectrum of 10.3 hours is equivalent to the actual operation of the loader for 609.2 hours,which means that the fatigue test process of driving axle is accelerated greatly.

In order to improve the seismic performance of tel-communications cabinets,comprehensive consideration of economic factors and ease,the inclined strut was added to cabinets.Pro/E software was used to found the cabinet modal and Hyperworks simulation analysis was carried out on a standard 19 inch tel-communications cabinets,simulating the adding mode and locating place of inclined strut on seismic performance of cabinets.Experimental results show that,under the condition of without affecting communications equipment installation,if the inclined strut is certain,so welding better than bolt connection,long brace connect to the hight of cabinets better than the short brace for improve the seismic performance of cabinet.

It is a complex and laborious job to define proper toolpath for belt grinding of complex part via traditional programming methods such as online robot teaching and Offline Programming(OLP).In order to provide a more natural and effective solution for robot teaching of belt grinding,a force feedback model for abrasive belt grinding is proposed by using virtual reality and haptic technology.Moreover,based the force model,a robot virtual teaching system is developed by integrating the Phantom Desktop^ force feedback device,which enable the user to adjust the grinding force,posture and other parameters dynamically in a more natural and real way to obtain a satisfactory grinding surface quality.Finally,the results of mechanical verification experiment and evaluation experiment of grinding surface quality show that the force model proposed is able to simulate the actual force accurately in belt grinding process,and moreover,after teaching process via virtual teaching system developed,the robot can obtain comparable surface grinding quality than the manual grinding via experienced work.

Final assembly process of product is the process of components gradually installed,function gradually improved,involving a variety of complex technology integration applications.It has a greater impact on the product development cycle and final quality.Based on the analysis of the main contents of digital assembly process and its characteristics,and by analyzing the implementation problems of digital assembly process planning.Applies the method of system engineering theory to the digital assembly process planning,and improves the classical Holzer model to establish a structure with logic dimension,time dimension,cognitive dimension which is suitable for assembly process.Then a framework of assembly process planning based on the modified Holzer model is built to improve capabilities of assembly process planning analysis and data integration.