【作者】 吴九山；

【导师】 蔡伟义； 姚嘉凌；

【作者基本信息】 南京林业大学 ， 载运工具运用工程， 2008， 硕士

【摘要】 随着国民经济飞速发展、高速公路网全面建设以及生活水平极大提高,汽车逐渐融入到人们工作生活之中,成为不可或缺的交通工具,人们对汽车的行驶平顺性和安全性提出更高的要求。悬架是影响汽车性能的关键部件,采用能够根据路面情况和车辆运行状态进行实时控制的智能悬架是提高汽车平顺性和安全性的一条重要途径。磁流变半主动悬架利用磁流变技术实现了阻尼实时控制,具有悬架系统是保证车辆乘坐舒适性和行驶安全性的重要组成部件。论文对基于磁流变减振器的1/4车辆半主动悬架控制系统进行了仿真以及试验研究。首先,论文运用车辆动力学理论建立了1/4车辆两自由度半主动悬架系统的动力学模型。同时,考虑到路面扰动输入对悬架控制的重要影响,建立出积分白噪声形式的路面不平度数学模型。依据控制原理分别设计了半主动悬架“天棚”阻尼控制算法和模糊PID控制算法,并通过软件Matlab 7.0构建了实现这些控制策略的半主动悬架控制仿真模型,取得了比较好的效果;其次,介绍了如何利用Matlab/Simulink的RTW代码生成工具将Simulink模型自动转换成C/C++代码的方法,并下载到含DSP芯片的TMS320 C6713评估板中。通过这种方式可以利用Simulink方便地建立系统模型,同时也解决了Simulink模型在Matlab/Simulink环境下速度较慢的问题,大大减少了软件工程师的编程工作量。转换后的C代码能脱离Matlab环境独立运行,这进一步扩大用该方法生成的C代码的适用范围;最后,论文利用了1/4车辆半主动悬架控制试验台,使用LabVIEW软件对半主动悬架模糊PID控制进行了初步研究。试验得到了被动悬架以及半主动悬架在正弦激励下的车身垂直加速度以及悬架动挠度曲线,试验结果表明模糊PID控制策略可以较好的控制悬架系统,改善了车辆的动态性能。更多还原

【Abstract】 With the rapid development of national economy, the overall construction of expressway network and the great improvement of people’s living standard, automobiles have gradually come into people’s life and work, and become an indispensable means of transportation. Meanwhile, people have made greater demands on the comfort and security of automobiles. The Suspension System is the very important components to ensure vehicles travelling comfort and safety. In this paper, the writer has done the simulated and experimented research on the quarter-car suspension system which equipped the magneto-reological damper.Firstly, a vehicle vibration model of 1/4 body with 2 degree-of-freedom is created, which is based on the vehicle dynamics theory. Considering the influence of the input disturbance, a mathematical description of road surface irregularity is established, which is the model of integral white noise. After the modeling of input, the semi-active suspension sky control strategy and Self-adapt Fuzzy PID controller are designed respectively and the computer simulations are built with Matlab7.0 individually, we simulated the quarter-car semi-active suspension system, and achieved the better results.Second, this paper proposes a method of using the RTWcode generation tool to convert Matlab/ Simulink to the C/ C++ code,and loaded into the TMS320 C6713evm board.Accordingly the system’ s model is constructed conveniently by using simulink. This can not only avoid the problem of low simulation speed of the model in Matlab/Simulink circumstance, but also deduce the workload of the programming engineer. In addition, the converted C code can run independently out of Matlab circumstance, which expands the use domain of the converted C code by this method.Finally, we present an experiment on a test rig of quarter car model equipped MR damper, and use the LabVIEW software to do a research on the fuzzy PID controller of the semi-active suspension system. Through the experiment we gain the acceleration and the suspension deflection of the sine excitation. The results proved that the fuzzy PID strategy is efficient for the semi-active suspension system, it improved the performance of suspension.更多还原