引用本文:黄静,李长春,延皓,杨雪松.改进HHT在线滤波算法在电液伺服系统控制中的应用[J].控制理论与应用,2016,33(8):1096~1104.[点击复制]
HUANG Jing,LI Chang-chun,YAN Hao,YANG Xue-song.Application of improved HHT online filtering algorithm in the control of electro-hydraulic servo system[J].Control Theory and Technology,2016,33(8):1096~1104.[点击复制]
改进HHT在线滤波算法在电液伺服系统控制中的应用
Application of improved HHT online filtering algorithm in the control of electro-hydraulic servo system
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DOI编号  10.7641/CTA.2016.50672
  2016,33(8):1096-1104
中文关键词  在线分析  Hilbert-Huang变换(HHT)  电液伺服系统
英文关键词  on-line analysis  Hilbert-Huang transform  electro-hydraulic servo system
基金项目  北京高等学校青年英才计划项目(YETP0567)资助.
作者单位E-mail
黄静* 北京交通大学 机械与电子控制工程学院 huangjing_mail@tom.com 
李长春 北京交通大学 机械与电子控制工程学院  
延皓 北京交通大学 机械与电子控制工程学院  
杨雪松 北京交通大学 机械与电子控制工程学院  
中文摘要
      希尔伯特一黄变换(Hilbert-Huang transform, HHT)是一种针对非线性非平稳信号时频分析的有效方法, 在诸 多领域有着广泛应用. 目前HHT变换主要应用于离线分析, 为了将HHT变换引入电液伺服控制系统, 实现了一种HHT 的在线滤波方法, 通过改进的经验模式分解法(EMD), 能对系统的输出信号进行实时滤波处理, 并适用于电液伺服控制 系统. 首先设定一定长度的滤波窗口, 利用文中改进后的EMD分解法对窗口内的数据进行经验模态分解, 从中得到噪声 分量和其他干扰信号分量. 然后从原信号中去除噪声和干扰信号分量, 达到滤波的效果. 由于该滤波器的时延特性不随 控制信号频率的改变而改变, 只与滤波器的窗口长度有关, 因此在控制器中可进行延时补偿, 将基于HHT在线滤波器的 控制方法应用于电液伺服控制系统中, 系统输出在相位和控制效果方面都取得了良好的效果, 验证了该方法的实用性.
英文摘要
      Hilbert-Huang transform is an effective method which is used to time-frequency analysis of non-linear and non-stationary signal, and is widely used in many fields. Hilbert-Huang transform is mainly used to off-line analysis by now, a new on-line filtering method based on Hilbert-Huang transform is proposed and applied to electro-hydraulic servo control system, this new filter can process system’s output signal in real time by using the improved empirical mode decomposition (EMD) method. Firstly, there should set the length of filter’s window and apply the improved EMD method to decompose the original signal data which is in the filter’s window. After this the noise components and other interference signal components can be got. Secondly, the noise components and other interference signal components can be removed from the original signal to achieve the filtering effect. As the time delay characteristics of this filter is not changed with the change of input signal’s frequency, it’s only related with the filter window length, so the time delay can be compensated by system’s controller. This new method is applied in electro-hydraulic servo control system and the output of this system has achieved good results both in phase and control effect, which illustrates the practicability of this new control method.