Cylinder pressure diagrams,fuel injection pressure histories both on pump side and injector side,injector needle valve lift are measured in practical total speed range for a turbocharging diesel engine.Fuel injection rate profiles and heat release rate profiles are calculated according by software pack for diesel engine fuel injection & combustion analysis and diagnosis.Analysis method of fuel injection and combustion process by means of characteristic parameters is proposed and applied to an automotive direct injection diesel engine with 3 kinds of different charging systems and useful results are obtained.

The introduction of the feed method of natural gas in the double fuel engine of the natural gas/Diesel by the technique of electronically controlled gas injection makes the engine have better performance in power,economy and emission.The injection pressure and phase position of natural gas have a great effect on the performance of engine.The article presents the study of the injection pressure and phase position of the double fuel engine of the natural gas/diesel.

This paper studies the self adaptive control scheme and algorithms of switchable damper.The introduced algorithms can be self adaptive to different road spectral density inputs,and can be realized very easily.Considering that some state variables are not so convenient to measure,Kalman filter is used in the paper.Simulation results verify the feasibility and effectiveness of the algorithms.

The paper expounds the working principle and control method of the mechanic hydraulic control system,through studying the typical control system of the metal pushing V belt continuously variable transmission (CVT).The dynamic performance and hydraulic control system have been studied through experiment.The test results and theoritical study agree well with each other.

In this paper,all of factors which affect the range of electric vehicle are analyzed.The methods and results which can improve the range of electric vehicle on the condition of lower energy density of battery and the theoretical basis for the development and popularization of electric vehicles are provided.

Numerical simulation of multi point bending process of strip under different loading paths is dealt with the finite element polycrystal model.The results of multi point forming of aluminium sheet under conditions of multi point die forming and edge to center forming are predicted by the developed FEPM software,which are the fields of equivalent tress,equivalent strain and average stress.Both calculated results and experimental results are verified.

Digital high speed on off valve is used in the article as priority valve to make up of digital electro hydraulic proportional directional valve,which fulfills digitized control of working device for loader.Mathematical model and control law of the digital electro hydraulic proportion system are put forward.Furthermore,computing simulation and experimental verification are carried out.

Cell type metering device can not meet the needs of precision planting.One of the main reasons is that the device is not suitable for the variety of seed size.In this paper,a new type of vertical plate metering device filling in inside,i.e,precision metering device with concave metering inner cell is chosen as an example.Through the theoretical analysis and computer simulation of the clearing process of a small seed in metering inner cell,the result shows when the seeds in metering inner-cell are smaller,the main factors of affecting clearing process are the length of metering inner cells and the rotative velocity of the vertical-plate.

In this paper,energy loss and problems about copper line annealing process are analysed.A new type of water sealed copper line annealing furnace has been developed,which differs from traditional ones in structure conducting heat completely.The applications raise the efficiency and quality.

The source coding and marking method in electronic map for road section saturation data in DRGS are analyzed in this paper.A new idea of section coding and color marking of road section saturation data is presented.The efficiency of source coding is improved,the method of display is much more convenient and visible.

This paper develops algorithms on synthetic data generation based on the mathematic model presented by IBM Almaden Center.Synthetic data generaion is the test foundation of association rule research.To verify that the new algorithm is advanced to the existings on performances and scalibility,the authors need to compare existing algorithms with new algorithms on various kinds of datasets different in size and potentially strong item size.The research makes it releasable and the result is relatively satisfactory.

This article employs statistic energy method and calculates sound eradiation insulation quantity of finite configuration complex damped armor plate.In addition,the authors also research on influence about radix board,add ons board ply and add ons board material for sound insulation quantity.

In this paper,the improved r and h adaptive finite element method based on matrix perturbation theory and element energy ratio is proposed.In structure vibration analysis,through r convergence adaptive finite element process,mesh optimization can be realized.In the light of the judgement on the changes in the magnitude of element energy ratio,a local optimal refinement can be achieved in the process of h convergence adaptive finite element method so that more accurate finite element solutions can be obtained with as least grids as possible.A lot of numerical examples are given and the proposed approach is shown to be feasible and effective.

Femoral stress has been studied by electrometric experimental stress analysis methods to know about femoral stress value and its distribution case in front and rear of replacement to artificial femoral head.Study results show that left and right femoral stress is larger than that of front and rear.The stress near the femoral head obviously decreases after replacing femoral head with the artificial.The stress change of every point is very small after fixing by artificial femoral head using bone cement.The stress declining is inhibited near femoral head after using artificial femroal head with collar.The study results mean much for clinic treatment and can provide scrientific basis for developing better artificial femoral head.

The paper discusses the changes of vibration systems with close frequencies.As the system parameters are changed,the relation of systems between close frequencies and repeated frequencies is formed.A simple and efficient sensitivity formula based on perturbation method for near defective systems is presented.

An interior point method for getting the K T point of a nonlinear programming under linear independent constraint qualifications is given at[1].The problem for getting K T point under the Cottle constraint qualifications is solved in this paper.

With minimum excess principle,the elastic plate with dispersing pressure is analysed in this paper.Dynamic characteristics of the plate with 4 edge simple support are researched and calculating method and result are given.Bend and shear are also taken into account.Finally,the effect of the structural dynamic parameter by dispersing pressure is discussed.

This thesis applies and extends coritivity theory to a kind of system,sets up direct connective bipartite system,provides core and coritivity theory with new definition for this system,and offers coritivity algorithem for the system.

The exhaust emission data from an automotive gasoline engine is taken with 9-mode Emission Test Cycle.The test mode emission contributions of three kinds of CO,HC and NO_x pollutants are analyzed.Based on the calculated contributions of the individual test mode and the same kind of test modes in the test cycle,the key modes for controlling emissions are found.

With sensitivity analysis method,the experimental research in dynamic modification of multistory shear wall structure is presented in this paper.The data gained supply the designer of tall building with valuble reference and provide necessary basis for evaluating anti-seismic property,designing safety and economy of multistory buildings.

The differential equation of long span plate of flexual vibration is established in this paper.The parameters in the equation are determined by the model experiment.The calculation results indicate that the mathematical model can accordingly represent the intrinsic mechanism of the self excited vibration.It is useful for determining the characteristics of long-span plate gate vibration of an engineering structure.

This paper analyses the bit allocation algorithm based on Discrete Multi-Tone.Using the algorithm,on the digital subscriber loop the authors get the receiving SNR curve and the result of bit allocation and power allocation.

In order to solve the forming problem in backbridge half-shaft casing,the authors adopt fissional structure in designing and develop a new technology using three roller cross-rolling principle.Batch production proves that the new technology is better than other past ones in forming,and it possesses many advantages such as saving material,efficient and has remarkable economic benefits.

The measuring apparatus,according to the buoyancy principle,is used to ascertain the density of the solid materials when the density of the distilled water is known,especially,when the objects are combined together with two different materials.If the density and the gravity of one material between them is known,the apparatus can automatically work out the result of the another one,and the unbroken measurement can be obtained.And it can process the temperature compensation and calculation.The results can printed automatically.