节点文献
履带车辆动静液复合转向系统特性研究
Research on Tracked Vehicle Steering Characteristic with Hydrodynamic and Hydrostatic System
【作者】 赵立策；
【导师】 李平康；
【作者基本信息】 北京交通大学 ， 机械电子工程， 2009， 硕士
【摘要】 履带车辆转向性能的优劣对整车的性能及传动系统的寿命都有很大的影响,已成为当前车辆传动研究领域中的一个新的研究课题。动静液复合转向机构由于采用液压转向机构和液力偶合器共同工作,弥补了当前履带车辆广泛采用的纯静液转向机构在转向期间动力不足的缺陷,受到越来越多研究人员的重视。本文完成了动静液复合转向机构的静液系统和动液系统在转向过程中运动学和动力学分析。针对当前采用该机构的某型履带车辆在转向期间出现的压力波动问题设计了电液比例控制系统的解决方案,并利用所建立的动静液复合转向系统模型对该问题进行了分析、探讨。论文的主要研究内容如下:1、综述了履带车辆转向的特点,以及转向机构的发展历程和国内外的研究现状及发展趋势。2、采用传递函数解析法,在Matlab/Simulink环境下,对动静液复合转向的静液系统进行了动力学建模和仿真,建立了电液比例变量泵和定量马达组成的泵控马达容积调速系统。重点分析了液力偶合器在部分充液时的特性,总结归纳了液力偶合器常用的流量调节方式。3、将电液相似原理引入到液压系统的建模分析中。利用拓扑建模的思想和策略,采用simulink软件完成了对部分液压元件的建模仿真,完成了对泵控马达系统的建模分析。4、详细分析了转向过程中出现压力波动的原因,探讨了抑制压力波动的控制方法,并采用电液比例阀系统替代实车上采用的充油阀,以改善液力偶合器的充油量。利用所建立的模型,采用PID控制算法对转向过程进行了控制仿真,并采用遗传算法对PID控制器的参数进行优化,改善了液压系统的控制品质。
【Abstract】 Turning performance of tracked vehicle, which has become a new research topic,has a great influence on the performance of the entire vehicle and the transmission system life. Hydrodynamic and hydrostatic steering system , composed of hydrostatic steering system and hydraulic coupling, has changed the power shortage condition when tracked vehicle with hydrostatic steering system is in the steering process. The kinematics and dynamics analysis of the steering system and a control system to inhibit pressure fluctuation were discussed in the thesis. The main research contents are as follows:1.Summarized the characteristics of tracked vehicle steering development course, domestic and foreign present research states and development trend of the steering devices.2.Transfer function method was used in modeling hydrodynamic and hydrostatic steering system. Model of pump-control-motor was built up. A detailed analysis of partially filled fluid coupling characteristics was carried on in this thesis.3.The principle of electro-hydraulic similarity was used in hydraulic system modeling. Models of hydraulic components were set up .Topological thinking and strategy was also carried on to complete the pump-control-motor system modeling and analysis.4.The reasons of pressure fluctuations were analysed . Electric-hydraulic proportional valve was utilized instead of oil-filled valve to inhibit pressure flutuations. A PID controller based on Genetic Algorithm was used in optimization process.