工程机械跑合试验台二次调节加载系统的研究

发布时间：2018-11-25 21:13

【摘要】：工程机械跑合试验台是对工程机械进行整车跑合、试验的一种大型设备。加载系统是试验台的核心系统，构成试验台的主体，它的性能直接影响到工程机械跑合-试验时的稳定性、快速性和控制精度。二次调节静液传动技术不但具有效率高、可控性好的特点，而且可以将制动的能量转换成电能回馈到电网。本文在满足工程机械跑合的稳定性、快速性要求的基础上，将二次调节静液传动技术应用到工程机械跑合试验台加载系统，采用机理建模的方法分别对二次调节加载子系统及恒压油源子系统建立数学模型，并对二次调节加载系统进行仿真研究。本文以工程机械跑合试验台二次调节加载系统为研究对象，具体完成了以下工作：首先，针对传统加载装置的加载力矩小，能量不能回收等缺陷，研究了二次调节静液传动技术，分析总结了二次元件的机构工作原理及二次加载系统的控制方式，，将二次调节静压技术应用到跑合试验台。其次，根据工程机械跑合、试验时的加载要求，拟定出了基于二次调节静压传动技术的跑合试验台原理图，并计算出试验台架的结构参数，为二次调节加载系统提供了理论依据。最后，建立了加载子系统（二次元件、电液伺服阀、变量油缸），恒压油源子系统（恒压变量泵、蓄能器）的数学模型。应用MATLAB软件分别对加载子系统，恒压油源子系统进行仿真分析，分析了加载子系统的稳定性、安全性及蓄能器对恒压系统的影响。本文通过对二次调节加载系统研究，丰富了二次静液传动理论的应用。建立了二次调节加载系统数学模型，为加载仿真分析提供了理论支持。仿真结果表明二次调节加载系统具有良好的稳定性，快速性及控制精度。节约了能源，实现能量回收，达到节能环保的目的。
[Abstract]:The construction machinery running-off test bench is a kind of large equipment for the whole running and testing of the construction machinery. The loading system is the core system of the test-bed, which constitutes the main part of the test-bed. Its performance directly affects the stability, rapidity and control accuracy of the construction machinery running-test. The secondary regulation hydrostatic transmission technology not only has the characteristics of high efficiency and good controllability, but also can convert the braking energy into electric energy to feed back to the power grid. On the basis of meeting the requirements of the stability and rapidity of construction machinery running, this paper applies the technology of secondary regulating hydrostatic transmission to the loading system of the running test bed of construction machinery. The mathematical models of the secondary regulating loading subsystem and the constant pressure oil source subsystem are established by the method of mechanism modeling, and the simulation research on the secondary regulating loading system is carried out. In this paper, the secondary adjusting loading system of construction machinery running-fit test bench is taken as the research object, and the following work has been done: firstly, aiming at the defects of the traditional loading device, such as small loading torque, and the energy can not be recovered, etc. This paper studies the technology of secondary regulating hydrostatic transmission, analyzes and sums up the working principle of the mechanism of the secondary element and the control mode of the secondary loading system, and applies the secondary regulating static pressure technology to the running-in test bed. Secondly, according to the load requirements of construction machinery running and testing, the principle diagram of running test bench based on the technology of secondary regulation static pressure transmission is worked out, and the structural parameters of the test bed are calculated. It provides a theoretical basis for the secondary adjustment loading system. Finally, the mathematical models of loading subsystem (secondary component, electro-hydraulic servo valve, variable cylinder) and constant pressure oil source subsystem (constant pressure variable pump, accumulator) are established. The loading subsystem and the constant pressure oil source subsystem are simulated by MATLAB software, and the stability, security and the influence of accumulator on the constant pressure system are analyzed. In this paper, the application of the secondary hydrostatic transmission theory is enriched by the study of the secondary regulating loading system. The mathematical model of secondary adjusting loading system is established, which provides theoretical support for loading simulation analysis. The simulation results show that the system has good stability, rapidity and control precision. It saves energy, realizes energy recovery and achieves the purpose of energy saving and environmental protection.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH137

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