基于小波变换与奇异值分解的航空器弹性自适应陷波方法  

A WT&SVD Based Adaptive Notch Filter for Aircraft Elastic Constraint

作　　者：张玩乐 王小虎[1] 张志健[1] Zhang Wanle;Wang Xiaohu;Zhang Zhijian(Beijing Institute of Control ＆ Electronics Technology,Beijing 100038,China)

机构地区：[1]北京控制与电子技术研究所,北京100038

出　　处：《航天控制》2018年第4期59-64,71,共7页Aerospace Control

摘　　要：针对现代航空器弹性振型频率低、接近控制系统频带,采用传统陷波滤波器抑制弹性模态,严重影响系统动态性能的问题,提出一种基于小波变换与奇异值分解的航空器弹性自适应陷波滤波方法。先利用小波变换与奇异值分解在线估计弹性振型频率,然后采用先验信息对估计结果作进一步处理,最后据此调整陷波器的中心频率,实现自适应陷波。仿真结果表明,该方法灵敏度高、辨识频率精度高、速度快、弹性抑制效果好。与相位稳定方法相比,在控制系统截止频率附近的相位滞后最大减小6.26°,最小减2.35°。An adaptive notch filter based on wavelet transform and singular value decomposition（ WTSVD） is presented for addressing the issue that the used traditional notch filter seriously affects the system dynamic performance because the elastic modal frequency is low and close to the control system band.Firstly,the WTSVD method is utilized for identifying the frequency of elastic modal,and then the prior information used deals with it. Finally,the center frequency of the notch filter is tuned according to the elastic frequency. The simulation results show that this method has high sensitivity,high precision,fast speed and good elastic constraint. By comparing with the phase stabilization method,the phase lag near the control system＇s cutoff frequency is reduced by the maximum of 6. 26° and the minimum of 2. 35°.

关 键 词：弹性振动 小波变换与奇异值分解 自适应陷波滤波 频率估计 弹性抑制 

分 类 号：V411.8[航空宇航科学与技术—航空宇航推进理论与工程]