【作者】 郭建华；

【导师】 高秀华；

【作者基本信息】 吉林大学 ， 机械设计及理论， 2005， 硕士

【摘要】 全路面起重机是一种新型高效的起重设备,要求其油气悬架系统能够适应各种不同工况下的要求,提供良好的操纵稳定性、平顺性等动力学性能。对油气悬架系统的建模和动力学仿真,能够为油气悬架的设计和优化提供快速、可靠的依据,因此,对全路面起重机油气悬架系统进行建模和动力学仿真具有重要意义。本文主要研究了以下几方面的内容。(1)以QAY50 全路面起重机连通式油气悬架为研究对象,根据油气悬架缸的简化物理模型,通过分析推导得到了其非线性数学模型,并应用工程计算软件MATLAB/Simulink 编制了油气悬架缸动态特性仿真程序。(2)通过计算机仿真得到油气悬架缸的动态特性、内部状态参数的变化规律以及各种参数变化对油气悬架缸特性的影响。(3)建立了表示油气悬架阻尼力和弹性力的数学模型,说明油气悬架本质上具有非线性刚度和非线性阻尼特性。仿真研究其结构参数和工作状态参数对油气悬架刚度和阻尼特性的影响。(4)利用第三类悬架系统动力学分析方法,建立了1/2 车辆非线性动力学模型。同时根据路面的功率谱构造出路面不平度时域信号,并以此信号作为路面输入信号,对油气悬架系统乘坐动力学性能进行了MATLAB/Simulink 模型仿真,得到全路面起重机的各项乘坐动力学性能指标,对该车辆的乘坐动力学性能进行了评估。(5)利用ADAMS 机械动力学仿真软件,根据双气室油气悬架缸原理,建立了油气悬架缸虚拟样机仿真模型,并进行了特性仿真。在此基础上,建立了连通式油气悬架车辆在离散路面激励下的虚拟样机模型,并对该模型进行了仿真研究,得到了车辆的侧倾性能指标。以上仿真方法和结果为全路面起重机悬架系统设计开发提供了依据,同时为车辆的转向系统研究提供了悬架系统模型,对全路面起重机乘坐动力学研究具有一定的参考价值。更多还原

【Abstract】 The hydro-pneumatic suspension (HPS) technology that appeared in 1970s is anew type of suspension. The HPS can meet the demands of ride comfort andhanding stability of the engineering vehicles because it’s excellent non-linearstiffness and damping characteristics. With inert gases N2 as spring and oil as forcetranslation medium, the HPS is a kind of passive suspension which integrating thespring unit and shock absorber. As a consequence, the HPS have not onlyperformances of traditional passive suspension, but also comprehensiveperformances of slow active suspension. HPS is a key technology to develop themodern engineering vehicles, and it has enormous potential market as well as broadindustrial application prospects.This paper selects the HPS system of a practical engineering vehicle as objectfor analysis and research, and establishes the physical model of hydro-pneumaticcylinder through properly simplifying its practical structure according to itsworking elements. Depending on hydrodynamics, BWR equation of real gas andthe first law of thermodynamics etc., the thesis establishes the thermo-mechanicallycoupled model for HPS, and on the basis of the model, studies theforce-displacement characteristics, force-velocity characteristics and non-linearstiffness and damping characteristics, analyzes the affection disciplines ofparameters such as excitation parameters, structural parameters and workingparameters on characteristics of HPS system. The simulative program of the ridedynamics model of HPS system was finished with the software ofMATLAB/SIMULINK.The simulation results provide a theoretical foundation forindependently developing and designing HPS system and a basis for evaluating thewhole vehicle performance.The paper mainly includes the following contents:(1) According to the physical model and the working elements of HPS withdual gas-accumulators, depending on hydrodynamics, BWR equation of real gasand the first law of thermodynamics etc., the thermo-mechanically couplednon-linear mathematical model for HPS is built up. On the basis of the model, byuse of the simulation software programmed in MATLAB/SIMULINK, the paper更多还原