全液压推土机动力驱动系统性能分析及控制研究

发布时间：2018-04-30 05:40

本文选题：推土机 + 液压驱动　；参考：《哈尔滨工程大学》2014年硕士论文

【摘要】：随着当今工程机械行业的快速发展,以推土机为代表的工程车辆的各项性能已有了大幅的提高,但整车的能量损失大,经济性不高及作业效率低等问题仍是困扰该行业进一步发展的主要问题,而车辆的行走驱动系统的性能的好坏是影响该问题的关键因素。液压传动系统以其独有的特性和优点受到了工程机械行业的青睐。目前,比较先进的推土机等工程车辆中大都采用全液压行走驱动系统。一个系统中综合性能的好坏与各元件自身性能,元件间参数匹配的好坏及控制策略的优劣有关。在传统的液压行走驱动系统的控制方式中,往往采用单一变量的控制,而忽略了元件间的匹配问题,导致系统不能发挥出其最优性能,为了有效地解决该问题,本文提出了将柴油机转速、泵排量和马达排量联合控制的三变量控制策略,即在考虑各元件间能良好匹配,各元件的效率能得到充分发挥的情况下而得出的控制方法。本文分析了变量泵、变量马达的效率及寿命的影响因素,综合考虑后得出系统参数最佳取值范围。在以提高系统的效率和功率利用率为目的的基础上,针对推土机的工作特点提出了元件间最佳匹配方式。以搭建的液压系统实验台为原型,采用Simulink仿真软件下的Simscape元件库建立了液压系统仿真模型,并与柴油机整机仿真模型和控制系统模型构成了液压动力驱动系统整体模型。将泵排量、马达排量和负载扭矩作为特性参数,在其取值范围内取七个水平,将系统压力和马达转速作为目标观测值,采用实验设计法进行实验分组,对特性因子与目标观测值之间做相关性分析,并建立了在全工况下系统压力和马达转速的响应面模型,并对其进行评价和验证,最后对响应面模型进行分析。根据元件间的匹配方法及系统压力和马达转速的响应面模型,提出了各作业工况下三变量控制策略的具体控制方法,然后进行仿真分析和试验验证,最终得出了该控制策略能够使系统稳定工作在最优点,且系统效率有所提高的结论。
[Abstract]:With the rapid development of construction machinery industry, the performance of engineering vehicles, represented by bulldozers, has been greatly improved, but the energy loss of the whole vehicle is large. The problems of low economy and low working efficiency are still the main problems that haunt the further development of the industry, and the performance of the vehicle driving system is the key factor affecting the problem. Hydraulic transmission system is favored by the construction machinery industry for its unique characteristics and advantages. At present, more advanced bulldozers and other engineering vehicles mostly use full hydraulic driving system. The comprehensive performance of a system is related to the performance of each component, the matching of parameters between components and the quality of control strategy. In the traditional control mode of hydraulic driving system, single variable control is often adopted, but the matching problem between components is ignored, which results in the system unable to give full play to its optimal performance, in order to solve this problem effectively. In this paper, a three-variable control strategy for diesel engine speed, pump displacement and motor displacement is proposed, that is, the control method is obtained by considering the good match between the components and the full play of the efficiency of each component. In this paper, the factors affecting the efficiency and life of variable pump and variable motor are analyzed, and the optimum range of system parameters is obtained. Based on the purpose of improving the efficiency and power efficiency of the system, the optimal matching method among the elements is proposed according to the working characteristics of the bulldozer. The hydraulic system simulation model is established by using the Simscape component library under the Simulink simulation software, and the whole hydraulic power drive system model is constructed with the diesel engine simulation model and the control system model. Taking pump displacement, motor displacement and load torque as characteristic parameters, taking seven levels within the range of their values, the system pressure and motor speed are taken as the target observation values, and the experimental design method is used to group the experiments. The correlation between the characteristic factor and the target observation value is analyzed, and the response surface model of the system pressure and motor speed under the whole operating condition is established, and the response surface model is evaluated and verified. Finally, the response surface model is analyzed. According to the matching method between components and the response surface model of system pressure and motor speed, the specific control method of three-variable control strategy under various operating conditions is put forward, and then the simulation analysis and experimental verification are carried out. Finally, it is concluded that the control strategy can make the system work stably and improve the system efficiency.
【学位授予单位】：哈尔滨工程大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU623.5

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