Study on an extended-range electric vehicle as object of reference,according to the basic parameters and the performance index of power system,parameters matching and selection of the power system of the extended-range electric vehicle is carried out,and verified by the experiment in field test.The results show that the vehicle can meet the maximum speed,acceleration performance,climbing performance and design mileage requirements,to verify the rationality of the power matching.At the same time,a comparative experiment was carried out on by setting procedures for working point are provided with fixed point strategy,2~5 strategies and continuous working strategies were analyzed the results showed that three working point is more reasonable,and the working point of traditional and continuous working strategies have their limitations. This experiment provides the basis for the subsequent development of extended-range electric vehicle.

By establishing the mechanical model, analyzes the HSK tool holder clamping mechanism, draws up the clamping force amplification mechanism of outside type tool holder clamping system; Reveals the influence factors of HSK tool holder/spindle clamping force, provides a theoretical basis for the control of the HSK clamping force. Also points out the existing clamping force measuring device of HSK tool holder, provides more scientific and reasonable guarantees for the using of clamping force of HSK tool system.

Encasement counting is an important part of edible oil production line.How to use the advanced technology in the high-speed assembly line to improve the efficiency,reduce cost,reduce the error detection rate and miss detection rate is the key.A complete set of intelligent encasement counting system based on machine vision is designed,including the hardware parts,such as industrial camera light source,industrial personal computer and so on,and the software parts,such as mechanical control,image processing and so on.A series of algorithms such as image preprocessing denoising,bottle cap positioning and lifting ring positioning are proposed to deal with the quantity of oil bottles and the defects of the lifting ring.Experimental results show that the proposed method can effectively improve the detection rate and efficiency,and meet the requirements of practical applications.

A simulation equipment of torsional vibration for dual mass flywheel was designed and built based on the research of torsional vibration characteristics of a new type damper.Inverter and torsional vibration motor were utilized as torsional vibration excitation device.Operation speed and torsional excitation could be adjusted in wide range,and collection and analysis of test signals are convenient.It could reduce the danger of testing on real cars and improve the testing efficiency.The design principle and equipment structure were introduced.Through a lot of trials of torsional vibration characteristics under different operating conditions such as no-load,loading and unloading of dual mass flywheel,relationships of the amplitude of torsional angles between two masses were analyzed.The results indicate that motor spindle end exist multiple resonances,whose torsional angle is larger,when the engine is at idle speed under the no-load condition.Dual mass flywheel has the effect of vibration isolation,and resonance speed can be reduced to below the idle speed.Under the load conditions,dual mass flywheel has the effect of vibration reduction,which halves the angle of torsional vibration amplitude,makes the resonance torsion angle around 0.005 rad finally.

To realize the optimum selection of used product remanufacturing scheme,the complexity of used product remanufacturing scheme is analyzed,and an entropy-based complexity measurement model for used product remanufacturing scheme is presented.In this method,the Failure Model and Effect Analysis (FMEA) methods,social network approach and information entropy theory are integrated to analyze the influence degree of the three factors,uncertainty of the criticality and damage level of used component,the post recovery schemes and the state of remanufacturing system,on the complexity of used product remanufacturing scheme in a quantitative way,the optimal remanufacturing scheme is gained by comparing the complexity entropy of different schemes.A used engine is taken as an example to demonstrate the feasibility and validity of the above assessment model.

In order to study the resonance frequency and transmission loss of the double Helmholtz resonators with different connection modes,the finite element model of single and double Helmholtz resonators is established by using Virtual.Lab Acoustics software.The characteristics of transmission losses of double Helmholtz resonators in series or parallel cases are calculated.Simulation results show that the resonance frequency of the double Helmholtz resonator with same volumes is slightly increased and sound absorption performance is improved significantly.When double Helmholtz resonators with different volumes,the resonance frequency is the resonance frequency of resonant cavity,and does not affect each other.When two Helmholtz resonators are connected in series,it conforms to the law of vibration of two degree of freedom spring mass vibration system,according to Helmholtz parallel relationship and extending to the perforated panel,the actual model of perforated panel was established.With the standing wave tube test of the actual model,through comparison with simulation of perforated panel,the correctness of the perforated panel model is verified.

Research on the output terminal bearing of rocker arm coal mining machine,using the project team to develop the coal mining machine load simulation program to get the force curve,through the analysis of the whole force of the coal mining machine,get the load of output terminal bearing.Comprehensive consideration of the constraints of the bearing in the work and the external environment and other factors,using ANSYS-DYNA to display the dynamic simulation,establish to the finite element model of bearing,obtain the stress characteristics of the bearing,in order to provide a basis for futher research on the motion characteristics of the rolling bearing of the output terminal

Real-time estimation of battery State of Health (SOH)for electric vehicleis has very important significance for guaranteeing charging and discharging performance of each battery pack and extending the life of entire battery pack.As an important part of battery management system,compared to the battery State of Charge (SOC)and battery equalization system,research on SOH obviously falls behind.The definition of battery SOH and its main influencing factors are introduced,the online and offline estimation methods are classified,and the common SOH estimation methods are discussed.Finally,the trend of SOH estimation method is looked forward,moreover the Kalman filtering online estimation and intelligent learning neural network online estimation methods are pointed out to be the future mainstream method

The number of express package is huge.The appearance of express package is similar.It causes the problems of low storage and access operation efficiency and the high handling cost.Especially for large shelves,courier access to goods and find the goods is very inconvenient.An intelligent express storage and access system is proposed and designed from changing the mode of original express storage and access.Considering the adaptability and extensibility,modular design is used to the structure design of an intelligent express storage and access system.Physical model and movement result show that the proposed system can achieve automatic express package storage and access,improving storage and access operation efficiency,reducing the labor intensity during express package storage and access.

Based on the pick and place positioning requirement during SMD’s one by one inspection process,a visual positioning method is proposed to achieve accurate transportation for SMD with Multi Degrees Of Freedom(MDOF).According to the one by one inspection process and the inspection layout,the allowable error boundary,in which component could be transported into the component trough successfully,is calculated.Besides,visual positioning error compensation method is put forward respectively corresponding to the top-view and bottom-view visual systems.With the X-bar and R control chart analysis,experiment is conducted to prove the accuracy and stability of the visual positioning method.The experimental results proves the positioning method can boost the accuracy and assure the stability in transportation process,which provides guidelines for components’ efficient transportation and accurate positioning one by one in rolls of SMD’s full-inspection.

Professional and technical personnel cultivating of 3D printing in domestic colleges and universities is still in its infancy presently.The urgency and feasibility of constructing talent cultivating mechanism for 3D printing professional education are illustrated,which based on current development situation of 3D printing industry,policy environment and social demand.In allusion to actual construction of 3D printing professional in our school,the education idea,cultivating objective,cultivating mode,course system,laboratory construction and professional development etc.are explored and practiced.In results,some important reference and basis are provided for technical personnel cultivating of 3D printing field in our country.

To fix position of the axis of the collum femoris conveniently and quickly in proximal femur operation,a new method based on local shape extraction is used to design the collum femoris axis locator.Firstly,femur digital model is acquired.Then,the local shape of proximal femur shape is extracted and reconstructed,which can be used as the personalized mating face of the locator.Meanwhile the axis of the collum femoris is also extracted.Finally,the entire locator is designed by CAD software and the installation errors are analyzed to verify the feasibility of the locator.It provides an effective way to design the surgical instruments and develop the personalized solutions,which will be helpful to reduce the experience requirement and the probability of the unnecessary iatrogenic injury.

In order to solve the contradiction between the lighter weighting,modal characteristics and pedestrian crash safety of the electric car hood,the structure optimization design of electric car hood was carried out by the HyperWorks software.Firstly,the pedestrian head collision simulation was carried out,and calculated the HIC value of head injuries.Secondly,the multi-objective topology optimization design for the electric car inner hood was conducted with compromise programming method.Then,the collision simulation and structural strength were validated by test for the improved model.Finally,the multi-objective size optimization design for the electric car hood was conducted by the adaptive response surface method.The optimization results show that the mass of the electric car hood after optimization is reduced by 8.8 %,the low order natural frequency values are greater than the resonance frequency,and the HIC value of electric car hood is 858.6.The results are satisfied with the standard of the Chinese pedestrian safety protection regulations.

Dielectric elastomer is a smart material which has great deformation performance,by using its special performance,a dielectric elastomer valveless micropump with double chambers and three simple harmonic oscillators was prepared.Using the three-dimensional simulation of FLUENT software,the charts of pressure,density,velocity vector and velocity path line were acquired.The conclusions are as follows from the comparison charts:the fluid with high velocity will generate more pressure to micropump,the density of fluid in micropump has no direct connection to fluid velocity,the velocity is higher in passageway where cross sectional area is smaller,and the velocity has little influence on path line.

Introduces a NC machining of the steam turbine’s helical steam seal and the realization processing process,through the analysis of parametric model conversion,ingenious use of the commands frame system,the programming and production efficiency are improved, the processing quality is guaranteed, the molding tool preparation cost is reduced, and the molding production and repair for knife the grinding production preparation cycle is shortened.

Machining process simulation technology has been studied in UG CAM platform.Takes machining process information and process model as process simulation inputs,process information is automatically parsed.Template instance obtained can be automatically executed in UG CAM so as to realize process simulation.The business of process simulation method is analyzed in detail.Expression and the design of machining process are briefly described.The basic flow of the process simulation method has been given.Automatic parsing process information and the method of automated decision machining geometric elements of different characteristics are the focus of analysis.Based on key technologies,process simulation module in the UG CAM platform was developed and integrated into KM3DCAPP-M system.Finally,the effectiveness of process simulation method is verified by an example.

A car multi-body dynamics model was built by using software ADAMS/CAR.The suspension spring stiffness and shock absorber damping characteristic were used as design variable,and the multi-objective genetic algorithm was used to perform optimization considering handling stability ride comfort.After optimization,a pareto set was obtained and an optimal solution was chosen from it,the result of analysis indicates that handling stability and ride comfort can be optimized effectively through this method

The consistency and the quantity of satellite droplet are important indicators to the jetting quality.In order to improve the jetting quality effectively,a mathematical model was established.The model can estimate the spring preload which is required for critical jetting,adjust the injection speed close to the critical jetting velocity by adjusting the spring preload,which can avoid satellite droplet and improve the glue dot consistency.Firstly,the cylinder model and the jetting model were established to obtain the glue resistance and gas resistance which will block the movement of pin.And then,the drive energy and the spring preload can be obtained base on the jetting theory and the energy conservation theorem.The availability of the model and the feasibility of the jetting quality improving method were verified.Finally,experimental obtained glue dots with diameter of 0.45 mm without any satellite droplet which consistency error is under 5 %.

To optimize the cut parameters on turning of SiCp/Al composites with high volume fraction,16 orthogonal experiments based on cutting speed,feed rate,cutting depth and nose radius are designed.The orthogonal experiments are conducted on 50 % SiCp/Al composites.Surface roughness value is achieved using surface roughness meter.The sensitivity of the four cutting parameters on surface roughness is analyzed by Taguchi approach.Accordingly,three prediction models of surface roughness based on multivariate regression equation,exponential equations are built respectively.The predicted results on surface roughness of the different prediction model on the same cutting parameters are compared and analyzed,and the optimal cutting parameters are determined.The cut experiments are conducted again,and the results show that the precise performance is achieved on predicting the surface roughness and determining the optimal cutting parameters by using the multivariate regression equation.

Speed control difficulty caused by nonlinear and strong interference is the bottleneck problem through the operation efficiency of the tractor hoist.Taking a caterpillar tractor hoist as a research object,an expert fuzzy PID control system of the tripping in operation speed based on tractor hoist was put forward,and the expert control rules were established.then the control device of tripping in operation speed for the tractor hoist was developed,and the workover test of the workover well in the tractor hoist was carried out.The results proved that the expert-fuzzy PID control system can achieve good control of the workover and reduce the working intensity of the workers and improve the efficiency and safety of the workover operation compared with the traditional manual control.

The domestic auto seat noise detecting is mainly in anechoic chamber in which require the environment of noise does not exceed 30 dB.However,this method of defect is building an echoic chamber such a high cost,low detection efficiency,operator skill affect measurement accuracy.In view of the above defects,this paper proposes a stochastic resonance based on singular value decomposition of on-line detection method of automotive noise signal,can filter out outside noise interference,effectively extract the seat vibration noise characteristic signal,for subsequent online assessment laid a solid foundation.Simulation and example results show that the singular value decomposition of stochastic resonance is denoising method than using singular value decomposition and more stable stochastic resonance method detects the signal frequency is more accurate,can enhance the amplitude of the signal,to better detect the weak signal submerged by noise.

On the basis of the structural characteristic of a Hyper Spectral Imager (HSI),a split-type POS installation scheme used for a three-axis Inertially Stabilized Platform (ISP) is proposed and the mounting bracket is then optimized based on multi-objectives.The POS installation scheme is composed of four parts which are overall layout,POS installation plan,mass balance plan and mounting bracket optimization,respectively.Firstly,optimized overall layout is determined according to the structural characteristics of the load,POS and ISP,namely,POS/holder and counterweight/holder are symmetrically installed on the ISP azimuth gimbal to offset the eccentric torque to roll and pitch axes whatever the imaging sensor is rotated to any position along azimuth axis.Secondly,to decrease the installation space,the POS is designed to install vertically on the top surface of azimuth gimbal.Thirdly,the counterweight is placed on the outer edge to produce the biggest moment while minimizing the mass.Fourthly,the multi-objectives optimization of mounting bracket based on the ANSYS Workbench simulation environment is carried out,resulting in mass decreased by 26.7 % under the condition of maintaining the strength and stiffness.Finally,based on the proposed scheme and optimized results,a three-axis ISP achieves high control accuracy which further helps the success of high-accuracy imaging of a HSI in the aerial remote sensing experiments.

The analysis of typical mechanical parts synchronizer ring and gear shows that annular parts have an irregular self-similarity.Therefore,the use of fractal theory and fractal dimension algorithm (structure function method and the box method)to calculate the fractal dimension of synchronizer ring and gear,proved that measured characteristics of annular part can be expressed by fractal theory.Further research papers based on fractal characteristics of measuring parts of the annular defect identification problem.The results showed that:compared to structure function method to identify defects synchronizer ring,box method has better stability and accuracy;structure function method has better stability and accuracy to identify defects gear;using different parts of the ring different fractal dimension algorithm can calculate the different measurement characteristics.

In order to measure the surface defects of the parts and obtain the 3-dimensional characteristic information,the surface defect detection system is proposed based on structured light technology.Firstly,the measurement system based on structured light technology is presented based on the introduction of structured light technology.Then the hardware system selection and the software system design is realized based on MATLAB software.Finally,the system was applied to decte the surface defects of connectiong-rod under the laboratory condition.The experimental results show that the designed system can acquire the 3D data of the surface defects and show the data in the picture when the measurement error can be controlled within 5 %.

As the complex space shape of stator coil of hydrogenerator and the difficulty of design and modification,a knowledge template based and skeleton based parametric design plan is proposed.The template library of knowledge templates is classified,which is divided into standard parts template library and structure template library.To research the process of this design method,a design specification for series products is presented.Design based on skeleton technologe is studied.Though introducing skeleton and template,the rapid design of structure template parts is realized.Based upon summarizing the design knowledge of a stator coil of hydrogenerator die,the experiment shows the design is practical and effective.

In view of the current situation that the blind supplies with product information recognition function designed for the blind are scarce,a braille convenient sticker printing device is designed and manufactured.The braille convenient sticker printing device adopts the NC dispensing control system with the gantry mechanical structure and the ultraviolet curing molding technology to realize the rapid generation of the convex braille on the convenient sticker for the blind people to touch and read.Examples show that: the braille convenient sticker printing device has good maneuverability.The user can easily convert and output the standard braille through the chinese-braille translation software provided by the device without the need to learn braille,and it is provided to the blind in the form of a convenient sticker which can be attached to the surface of the target object;and the spot colloidal braille cured by UV has the advantages of waterproof and wear-resisting.

The valve guide grinding feeding machine for large labor intensity,the feeding efficiency is low in the materials,the development of an automatic feeding machine,using PLC control system for automatic control of the feeding process,to achieve continuous cycle of feeding material,in order to improve the efficiency,and can be set by the touch screen different lifting and feeding speed,to meet the different requirements of the feeding time.According to the site commissioning and customer use,PLC control system hardware anti-interference ability,maintenance is simple,reliability improvement.The whole system is of great significance to realize the automatic control of the feeding process,to improve the efficiency and material quality.

In view of the requirement of on-line bearing surface defects detection and shortage of the method of traditional manual,design a set of defects detection of bearing surface based on TMS320DM642.The system hardware platform mainly include video codec module,video storage module,programmable logic controller CPLD and core DSP chip;Software design include bearing image capture,image preprocessing,image positioning,subtraction processing,morphological operating,defects recognition,etc.The experiment results shows that,this system has the features of good stability,high reliability and good real-time performance,it can be used for real time detection of bearing surface defects.