Chirp信号激励的电液伺服系统辨识  

Identification of Electro-hydraulic Servo System Based on Chirp Excitation Signal

作　　者：王晗[1] 张卯瑞[1] 李俊夫[2] 杜靖[3] 

机构地区：[1]哈尔滨工业大学控制理论与制导技术研究中心,黑龙江哈尔滨150001 [2]哈尔滨工业大学电气工程系,黑龙江哈尔滨150001 [3]哈尔滨工业大学控制科学与工程系,黑龙江哈尔滨150001

出　　处：《机床与液压》2016年第13期128-131,共4页Machine Tool & Hydraulics

摘　　要：为得到某电液伺服转台系统的频率特性,采用Chirp信号作为激励。为解决原始时域采样信号直接经FFT处理得到的频率特性曲线严重畸变问题,对原始时域采样信号依次进行传统低通滤波、小波包去噪、高频段相位跳变修正后,再进行FFT,最后采用Smooth平滑滤波方法得到系统最终的频率特性曲线,满足了系统调试和性能评价的要求。In order to obtain frequency characteristic of an electro-hydraulic servo turntable system, Chirp signal was adopted as excitation.In order to solve the problem of serious distortion of frequency characteristic curves derived directly from Fast Fourier Trans-form （ FFT） of original time-domain sample signals, original time-domain sample signals were processed successively by low pass filte-ring, wavelet packet denoising, and amendment of phase hop at high frequency, and by FET.Finally, smooth filtering is used to ac-quire frequency characteristic curves, which really satisfy the requirement of system debugging and performance assessment.

关 键 词：CHIRP信号 低通滤波 小波包去噪 相位跳变修正 Smooth平滑滤波 

分 类 号：TM935.23[电气工程—电力电子与电力传动]