In order to promote the application and popularization of hydraulic simulation technique and to bring into play the advantage of bond graph technique in modeling , this dissertation carries out the researches on the visual dynamic modeling of hydraulic systems and its key techniques . the aim of the research is to relax the contradiction between the requirement of dynamic simulation and the faultiness of support software . moreover , a general purposed simulation software of hydraulic system based on bond graph technique which is more useful , easy to use and popularize would be developed 为了改变这种不利状况，推动液压仿真技术的推广与使用，充分发挥出键合图技术在建模方面所具有的优势，本论文开展了液压系统可视化动态建模及其关键性技术的研究工作，旨在进一步改善动态仿真需求与软件支撑不完善性之间的矛盾，研制开发出具有较强的实用价值、更易于用户使用与推广的基于键合图建模技术的液压系统动态仿真通用软件。
Power bond graph is used to established the bond graph model of the lifting and dropping of hydraulic pile hammer and state space equation in the paper for hydraulic pile hammer is perplexing nonlinear system . in order to attain the graph that pressure , position , velocity , acceleration vary with time in the course of driving pile simulation procedure solving state space equation is designed on the basis of combining four - order runge - kutta method with predicator - corrector method , dynamic simulation of the hydraulic system is studied in matlab 6 . 5 . it is convenient to analyse dynamic characteristics of the hydraulic syste m , beneficial to the design and parameter optimization of the hydraulic system . in the final part of the paper , under detailed analysis of the control characteristics for double - acting hydraulic pile hammer with double cylinders , control system based on the programmable logic controllers founded on technology of modern compute is designed 由于液压打桩锤液压系统是一个复杂的非线性系统，本文采用功率键合图法建立液压打桩锤上行、下降的键合图模型和状态空间方程，通过四阶龙格?库塔法和预估?校正法相结合编制了仿真程序对状态空间方程求解，在matlab6 . 5中进行液压系统的动态仿真，获得液压打桩锤运动过程中压力、位移、速度、加速度等随时间变化的曲线图。此曲线图方便了对液压系统动态特性分析，为液压系统的设计和参数优化提供了有益的借鉴。最后，在深入分析双缸双作用液压打桩锤控制系统的功能要求后，采用了以现代计算机技术为基础的新型工业控制装置? plc可编程控制器，设计出了双缸双作用液压打桩锤的电器控制系统。
The author briefly introduces the present situation of modelling and simulation of the battery and its temperature management system on ev . and discusses the rationale of bond graph and its application in engineering emphasis on the use in the electricity system and the thermodynamic system in detail , and obtains the state equation at last 详细探讨了键合图理论基础及其在工程中的应用，并重点深入研究了键合图在电系统和热力学系统中建模的特点、方法和步骤，包括传导传热的键合图表示和对流传热的键合图表示，并进一步讨论了键合图的增广定向和系统的数学模型? ?状态方程的推导。
2 ) based on the application of the bond graph , analyze the characters of engine , motor , battery and vehicle , uniform the electric power , heat power and mechanical power into the same mathematic model in order to alter the types and parameters of hybrid electric vehicle in convenience . 3 ) the system based on the bond system can also simulate in different direction 2 )根据键合图理论，进行了发动机、电机、电池与车辆的键合图分析，采用能量流将电、热、机械能量统一在一个数学模型中，随着混合动力电动汽车不同的布置形式，可以方便、灵活地更改系统构成与元件参数与特性(如非线性、间隙等) 。
The thesis focuses on the basic principles of fault diagnosis , qualitative modeling of lre , qualitative reasoning techniques and diagnosis mechanism for lre . in the thesis , the theoretical foundation of diagnosis based on component is expounded . on the basis of above works , a relation - based diagnosis method is proposed by considering the practical diagnosis problems for lre , and a diagnosis example is demonstrated 本文首先对基于定性模型诊断方法的分类、特点和研究现状进行了评述，接着分别研究了基于部件模型的诊断方法、基于定性键合图模型的诊断方法、基于时间因果图模型的诊断方法在液体火箭发动机上的应用，其内容涉及故障诊断基本理论与原理、发动机定性建模技术、定性推理技术以及针对液体火箭发动机的故障诊断机制和策略。
A reasonable choice among the factors affecting on the fluid drive system are made , established the static and dynamic mathematical models system by mean of the power bond graphs . on the basis of modifying the original digital simulation program , the digital simulation study is made 对系统的各元件进行了详细的分析、依据系统工况要求和元件在系统的功用对其模型进行了合理的取舍；遵循功率流向，采用先进的功率键合图?状态空间法技术建立了系统的静、动态数学模型。
When modeling and simulating the whole system , the writer divides the periodical change of valve into many segments . with the method of power bond graph , the writer deduces the state equations of the system , which converting the substantial model into mathematical model . in the simulation , the writer uses matlab as the programming language 在对整套系统进行建模和仿真时，笔者将控制阀的周期性变化过程进行分段考虑，应用功率键合图法，推导出阀控气动振动系统的状态方程，实现了实物模型向数学模型的转化。
This paper introduces an all - purpose simulation software for power bond graph oriented - pbg . after the indepth research on computer simulation technique for power bond graph oriented , it is developed with visual basic 6 . 0 as master development language , matlab 5 . 3 as computation engine on the basis of reference to similar software internal and overseas 本文通过对面向功率键合图的计算机仿真技术的深入研究，在参考国内外同类软件的基础上，以visualbasic6 . 0为主控开发语言，以matlab5 . 3为计算引擎，开发了面向功率键合图的通用仿真软件- pbg 。
