商用车驾驶室磁流变隔振系统控制仿真研究

发布时间：2018-05-04 09:42

本文选题：驾驶室悬置 + 磁流变阻尼器　；参考：《重庆大学》2014年硕士论文

【摘要】：磁流变阻尼器具有响应快和耗能低等优点成为了目前智能悬架领域的研究热点。而控制策略的设计又是磁流变半主动悬架的关键技术。因此本文开展了磁流变阻尼器力学性能试验，并在试验数据基础上建立其正逆模型。利用数值分析法建立商用车驾驶室磁流变半主动悬置的动力学方程，分析其动力学特性，研究阻尼和刚度系数的不同对悬置系统传递特性造成的影响。并利用PID控制策略、模糊控制策略、仿人智能控制策略对驾驶室悬置系统进行仿真控制研究。主要工作有： (1)介绍驾驶室动力学模型和磁流变阻尼器及其控制方法的研究进展，提出目前磁流变半主动悬架存在的问题，并总结概括本文将要开展的主要工作。 (2)介绍磁流变阻尼器的工作模式，分别在流动和剪切两种工作模式下对阻尼力进行了推导，得出了在混合模式下总阻尼力公式。选取阻尼器的结构类型、参数。对磁流变阻尼器进行工作特性测试，并分析阻尼器的示功曲线和速度曲线。基于BP神经网络对磁流变阻尼器进行正向建模，描述磁流变阻尼器的力与位移、速度以及电流之间关系，同时建立了更有实用价值的逆模型，并用测试得到的数据对模型进行了验证。 (3)阐述驾驶室隔振系统的评价指标，建立随机路面的不平度输入模型和三自由度1/4驾驶室隔振动力学模型。在Simulink中分析悬置参数(阻尼系数和弹簧刚度)的变化对驾驶室悬置传递特性的影响。 (4)介绍常用的隔振评价方法。分别阐述了PID控制策略、Fuzzy控制策略、HSIC控制策略的基本原理和方法，建立各自的控制器仿真模型，并基于Matlab/Simulink及相应的工具箱搭建驾驶室悬置的控制仿真系统，然后在脉冲激励以及随机路面激励的作用下分别对比不同控制(PID控制、Fuzzy控制、HSIC控制)和未加控制的控制效果，最后根据驾驶室垂直振动加速度和驾驶室位移两个参数的对比结果对这三种控制策略进行了比较和评价。最后，对全文进行了总结，指出了本文所存在的不足以及需要更加深入研究的问题。
[Abstract]:The magnetorheological damper has the advantages of fast response and low energy consumption. The design of the control strategy is the key technology of the magnetorheological semi-active suspension. Therefore, the mechanical performance test of the magnetorheological damper is carried out in this paper, and the positive and inverse model is set up on the basis of the test data. The dynamic equation of the magnetorheological semi-active suspension of commercial vehicle cab is established, and its dynamic characteristics are analyzed. The influence of the difference of damping and stiffness coefficient on the transmission characteristics of the suspension system is studied. The simulation control of the cab suspension system is studied by using the PID control strategy, the fuzzy control strategy and the human imitation intelligent control strategy. The work is as follows:
(1) the research progress of the dynamic model of the cab and the magnetorheological damper and its control methods are introduced. The existing problems of the magnetorheological semi-active suspension are put forward, and the main work to be carried out in this paper is summarized and summarized.
(2) the working mode of magnetorheological damper is introduced, and the damping force is deduced under the two working modes of flow and shear respectively. The formula of the total damping force under the mixed mode is obtained. The structure type and parameters of the damper are selected. The working characteristics of the magnetorheological damper are tested, and the indicator curve and the velocity curve of the damper are analyzed. The BP neural network is used to forward the forward modeling of the magnetorheological damper, describing the relationship between the force and displacement, the velocity and the current of the magnetorheological damper. At the same time, a more practical inverse model is set up, and the model is verified by the data obtained by the test.
(3) the evaluation indexes of the vibration isolation system of the cab are described, the unevenness input model of the random pavement and the three degree of freedom 1/4 cab vibration isolation dynamic model are established. In the Simulink, the influence of the changes of the suspension parameters (damping coefficient and spring stiffness) on the transmission characteristics of the cab suspension is analyzed.
(4) the common vibration isolation evaluation methods are introduced. The basic principles and methods of PID control strategy, Fuzzy control strategy, HSIC control strategy are expounded respectively, and each controller simulation model is set up. Based on Matlab/Simulink and the corresponding toolbox, the control imitation system of the cab suspension is built, and then the impulse excitation and the random pavement excitation are also set up. The effects of different control (PID control, Fuzzy control, HSIC control) and uncontrolled control are compared respectively. Finally, the three control strategies are compared and evaluated according to the comparison results of two parameters of the vertical vibration acceleration of the cab and the cab displacement.
Finally, we summarize the full text, and point out the shortcomings of this paper and the problems that need further study.

【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U463.8;TB535.1

【参考文献】