基于最小均方归一化自适应滤波算法的电液伺服幅相控制的系统.doc

基于最小均方归一化自适应滤波算法的电液伺服幅相控制的系统 （上器 上海200072） 摘要：电液伺服系统研究是为了取消正弦响应振幅衰减和相位延迟，采用了一种最小均方归一化（LMS）自适应滤波算法。为了产生算法理想的输入，我们根据权值来修正命令输入，并且反馈被引入反馈校正，其输出是加权反馈。归一化的LMS自适应滤波算法的权值根据理想输入与权值反馈质检的估计输入进行在线更新。因此，更新的权重又被被复制到输入修正。估计误差通过归一化LMS自适应滤波算法强制转换为零，这样加权的反馈就是全部的理想输入，使得反馈追踪输入命令。上述概念就是幅相控制发展的基本原理。该方法具有良好的实时性并且不用估计系统模型。仿真和实验结果表明，所提出的幅相控制能有效地并且高精度减少幅值衰减和相位延迟。 关键字：幅值衰减；相位延迟；归一化的LMS自适应滤波算法；跟踪性能；电液伺服系统； Amplitude phase control for electro-hydraulic servo system based on normalized least-mean-square adaptive filtering algorithm (sity, Shanghai 200072, China) Abstract: The electro-hydraulic servo system was studied to cancel the amplitude attenuation and phase delay of its sinusoidal response, by developing a network using normalized least-mean-square (LMS) adaptive filtering algorithm. The command input was corrected by weights to generate the desired input for the algorithm, and the feedback was brought into the feedback correction, whose output was the weighted feedback. The weights of the normalized LMS adaptive filtering algorithm were updated on-line according to the estimation error between the desired input and the weighted feedback. Thus, the updated weights were copied to the input correction. The estimation error was forced to zero by the normalized LMS adaptive filtering algorithm such that the weighted feedback was equal to the desired input, making the feedback track the command. The above concept was used as a basis for the development of amplitude phase control. The method has good real-time performance without estimating the system model. The simulation and experiment results show that the proposed amplitude phase control can efficiently cancel the amplitude attenuation and phase delay with high precision. Key words: amplitude attenuation; phase delay; normalized least-mean-square adaptive filtering algorithm; tracking performance; electro- hydraulic servo system引言 液压驱动在工业上被广泛使用。与其他类型的驱动器相比,他们有很多独特的优势,如开发一个相对小型但有高扭矩、高的响应速度、高刚度和高专性力[1?3]的设备。电液伺服系统的输入是