以国产某型履带车辆为研究对象,利用AMESim建立整车的液压模型,并与MATLAB联合仿真,分析影响机械式缓冲阀缓冲特性的因素,即研究油温、蓄能器弹簧、节流阀孔、泵四个方面对缓冲特性的影响;确定节流阀孔面积、油温、蓄能器弹簧弹性系数等与操纵油路油压之间的动态关系。并对缓冲时间对换挡品质的影响进行了仿真分析,为进一步对车辆换挡缓冲技术进行研究奠定基础。

To broaden the range of hardware in loop simulation for electronic controlled unit in application, a study on model simulation of electronic unit pump diesel engine oriented to control is made, the requirements and selection of simulation model oriented to control in electronic unit pump diesel engine are provided, and the model of simplified nonlinearity in diesel engine and electronic unit pump system are established in Matlab/Simulink. Model verification shows that this model can achieve fairly good accuracy. With the calculation time and parameter as evaluation index, different calculation steps and methods affecting the model output are analysed and compared. Real model is applied into hardware-inloop simulation test, its results show that the model can perform real-time ECU hardware-in-loop simula- tion test accurately.

An extended ethanol oxidation mechanism is presented and validated in this paper.The distribution law of the reactants,free radicals,carbon-based intermediate products and combustion in the 1D laminar flame structure of ethanol-air mixtures under different initial conditions is calculated by using the extended mechanism and molar concentration distribution curve of NOx is predicted.For the ethanol-air flame,the main conclusions are as follows: the concentration of the free radical OH,H and O increases with the increase of the initial temperature and decreases with the increase of initial pressure and dilution ratio.The changing principle of the free radicals under initial conditions can partially explains the changing law of laminar burning velocity obtained through experiments and calculation.

A The developing of green remanufacturing for vehicle engine was introduced briefly. Based on the analyzing of key part¡¯s failure mode and remanufacturing of armored vehicle engine this paper introduced the remanufacturing technology program for a tank diesel engine and introduced a preliminary evaluation criterion which is an exploratory development for the construction of index system on there manufacturing engine.

Based on the analysis of the high temperature decomposition of oxydal(H2O2)and the combustion of diesel engine,the effects of H2O2 on the improvement of diesel combustion were studied.An oxydal spray system was designed to inject H2O2/water mixture into the manifold.The experiment was carried out on a 1135 diesel engine bench.The results show that H2O2 injection can make the curve of heat release rate move forward and decrease its peak value.The specific fuel consumption is decreased a little,while both NOx and PM emission are obviously reduced.

The full-conditions heat balance bench test of a certain type of exhaust-gas turbo-charged diesel engine is carried out according to load-characteristic test rules of diesel engine. Taking the rotation speed,oiling teeth bar displacement,exhaust gas temperature and corresponding output torque testing data of each steady working condition bench test as training sample and testing sample,a high precision and strong generalization predictive model for dynamic torque of diesel engine is established by repeatedly learning BP neural network.

Based on the principle of the self-propagating high-temperature synthesis (SHS) reaction of Ti and C powders, a Ti CNi cermet composite coating was prepared successfully on LY12 alloy substrate by means of laser cladding. The good technical parameters such as laser power, scanning velocity, beam diameter, overlap ratio and so on were gotten. The OM, XRD, EDS techniques were employed to study the phases of the coating. The results show that the top coating is a layer of TiCNi, below which is the Ni-Al intermetallic fusion layer and the substrate, and the coating's microstructure is dense and pure. Elements are diffused mutually at both sides of the interface and a metallurgical bonding interface. The heating of the reaction coarsens the grain size of the substrate near the interface. The formation mechanism of the layer is explained. It involves a series of SHS reactions, including the reactions between Ti and Ni, Ti and C, Ni and Al. Good interfacial bonding is achieved at the fusion layer, TiCNi interface and the fusion layer/ LY12 alloy substrate. The thermal shock experiment was employed to study the thermal shock properties of the coating at different elevated temperature. The results show that the thermal shock property of the coating is fine.

An integrated simulation platform that combines performance,structure,intensity and evaluation is built in this paper.The platform consists of power system simulation test of armored vehicles,transmission system simulation test,power system and transmission system integration simulation test and comprehensive evaluation of Performance.The platform can be used to realize the functions such as components performance simulation,components structure simulation,integrated simulation of properties and structure matding analysis,comprehensive evaluation of performance and so on.Through performance analysis and structure simulation of power transmission system of a certain main battle tank,the reliability and accuracy of the platform are validated.It can provide modern methods and means for improving the technology level of armored vehicle′s power transmission.

The signification of using heat insulation technology in a military armored vehicle was discussed.The difficulties and key problems of heat insulation technology in an engine were also analyzed.Based on the semisolid processing theory,material property research method and analogy testing method,hot simulation experiments were carried out to study the distortion rule and quality of cermets,such as TiC-Ni,at high temperature.The broken mechanism of cermets at high temperature was explored.The experimental and research results indicate that non-elasticity strain associate with time in nature according to constitutive equations of the classical elastic-plastic and creep theory.Non-elasticity strain should be expressed by uniform method for it is controlled by the single mechanism.Namely,it should be disposed by elastic-viscoplasticity constitutive equations which associate with plastic strain and creep strain.The mathematical model which can reflect the distortion character of cermets at high temperature was established by multiple regression analysis based on hot simulation experiment data,and statistical test of the mathematical model revealed that the mathematical model is reasonable.

TiCNi composite coating on aluminum alloy was prepared by combining forced-compaction with self-propagating high temperature synthesis(SHS).Influence of process parameters during TiCNi cermets combustion synthesis and densifying to interface bound state were analyzed.The process parameters include preform density,pre-pressure,pressure and pressing time,holding time at high pressure,technology of powder mixing,powder composition and its particle size,coating thickness and so on.Microstructure of the samples was observed using optical microscope.Thermal-shock resistance and microhardness of the coating were measured.The results show that good interfacial bounding is achieved at coating/substrate interface.The mechanism of the compound of TiCNi/Al was revealed by means of theoretic analysis,which involved a series of SHS reactions in the coating interior and the interface between coating and substrate.

The basic component and function were introduced briefly. In light of OO technology and modular design, the scheme of two-dimension situation in the war game system was provided based on HLA/RTI. The general frame of two-dimension situation was set up and the technique difficulties in the realization of two -dimension situation were analyzed and resolved. And the method of aggregation-disaggregation was used to solve the different differential problem. The result of application in different systems says that it can be applied to other system easily and reused easily.

The research actuality and the existent question of minitype ICE are introduced.The structure and working principle of a rotating blade engine are studied and a unique planet framework is designed.The problems of the rotating blade engine are summed up.It's pointed out that the rotating blade engine is a novelty engine and can fit for some special applications.There are some research value and application foreground.

This article discusses the significance in special vehicle and the difficulty in research of the Low Heat Rejection(LHR) Engine.The heat transmiting character of the Low Heat Rejection Engine is analysed and the heat transmiting boundary conditions of the firebox are computed by experience formular.This article analyses the character of the finite element method in unstable heat transmiting.The hot intensity of the heat insulation parts is analysized by the finite element method.The results indicates that the accretion of the hot burden and the hot intensity is one of the main reasons to lower the security of the heat insulation parts.

The status quo of die for semi-solid processing of ferrous metal and the problems in apˉplication of ceramics were discussed.The characteristic of self-propagating high-temperature synˉthesis(SHS)technology was introduced.A die with internal lining ceramics coat was made by using this technology.Then a semi-solid aluminum alloy forming experiment was made in the die.The results showed that the self-propagating technology was feasible in preparing ceramics dies and in semi-solid metal forming.

The technical performance and important characteristics of three newest high power density engines of armored vehicles are introduced.These engines adequately show the excellent performance and developmental potential compared with other engines of armored vehicles.Some advices of developing the high power density engine in our country are put forward through analyzing the technical difference between our diesel engines of armored vehicles and these engines.

The differences between dynamic characteristics and steady characteristics of diesel engine are analyzed in this paper.The research methods of dynamic characteristics of diesel engine are summarized systematically which mainly includes experimental research and simulation calculation.According to the different research purposes,the advantages and disadvantages and its applicability of various dynamic model are also presented.It follows that the dynamic characteristics model based on data of steady test is mainly used in the performance simulation of the whole vehicle,and the nonlinear model based on simulation calculation was mainly used in control analysis,parameter optimization and matching.

According to the datum of engine experimenting, this article puts forward the non-linearity relationship between fuel consumption rate and rotate speed and torque. The universal characteristic of engine is cambered by using the multiple regression analysis. The result of calculation is checked out with statistic inspection. This article, in the end, points out that the universal characteristic of engine will be more accurately expressed by subsection function.

The techniques of making internal ceramic coating by static self-propagating high-temperature synthesis(SHS) method on the thin wall pipe,straight pipe,elbow pipe,tee pipe and double layer pipe were developed.A technology of static-centrifugal SHS was proposed.The possibility of using the ceramic coating as thermal insulation layer in the cylinder or exhaust channels or vent-pipe on engine has been researched.A new semi-solid working mould was developed using SHS coating technique.Details of the coating tests including coating process optimization,hot shock test,the flaw detecting by X-ray and the application experiments on liquid forging of steel and aluminum alloy were carried out.The results show that the ceramic coating on semi-solid forging mould can improve the service life of the mould remarkably.

野外无电无气条件下,损伤零件的应急快速焊接修理具有十分重要的意义.为此,利用铝热焊接无需电、气以及操作方便的特点,自行设计制作了自蔓延焊锅、自蔓延焊筒、便携式焊轴器和可调式焊轴器4种应急焊修工具,推动了铝热焊接技术的实用化进程.