| 基于插值DFT的弹体弹性自适应陷波方法 |
| |
| 引用本文： | 张志健,王小虎,王铁军.基于插值DFT的弹体弹性自适应陷波方法[J].宇航学报,2013,34(9):1239-1245. |
| |
| 作者姓名： | 张志健 王小虎 王铁军 |
| |
| 作者单位： | 北京控制与电子技术研究所，北京 100038 |
| |
| 摘 要： | 针对现代导弹弹性频率低、频率不确定范围大，传统陷波方法会造成严重相位滞后的问题，提出一种基于插值离散傅立叶变换（IpDFT）的自适应陷波方法。该方法利用修正Jacobsen方法辨识、跟踪测量信号中弹性模态的频率，并调整陷波器的中心频率来实现自适应陷波。该估计器频率辨识精度接近克拉美罗下界（CRLB），弹性幅值变化对辨识精度的影响很小。仿真对比表明，该方法灵敏度高、辨识快、相位延迟小、弹性抑制效果好。与固定参数陷波器相比，相位滞后从29.4°减小到11.86°；与一类用自适应陷波器频率辨识方法相比，辨识时间从2s减少到0.25s，弹性振动幅值峰值为其10%。
|
| 关 键 词： | 弹性弹体 自适应滤波 插值离散傅立叶变换 频率估计 振动抑制 |
| 收稿时间： | 2012-11-22 |
An Interpolated DFT Based Adaptive Notch Filter for Missile Bending Mode Suppression |
| |
| ZHANG Zhi jian,WANG Xiao hu,WANG Tie jun.An Interpolated DFT Based Adaptive Notch Filter for Missile Bending Mode Suppression[J].Journal of Astronautics,2013,34(9):1239-1245. |
| |
| Authors: | ZHANG Zhi jian WANG Xiao hu WANG Tie jun |
| |
| Affiliation: | Beijing Institute of Control & Electronics Technology, Beijing 100038, China |
| |
| Abstract: | An interpolated Discrete Fourier Transformation (IpDFT) based adaptive notch filtering method is proposed to solve the problem that the conventional notch filter can cause a serious phase lag because flexible missile has uncertain low and wide range bending modes. A modified Jacobsen estimator is used to identify and track a bending frequency, and then the center frequency of the notch filter is tuned according to the bending frequency. The estimator closely follows the Cramer Rao lower bound (CRLB), even when the amplitude of the bending mode is time varying. The performance of the proposed method is verified by computer simulation, and high sensitivity, short identification time and fine resonant suppression of the method are demonstrated. Indeed, compared to the non adaptive notch filter, the phase lag is reduced from 29.4°to 11.86°. Compared to another kind of adaptive notch filter(ANF) based filtering method, the identification time is reduced from 2 s to 0.25 s, and the bending mode amplitude is 10% of that. |
| |
| Keywords: | Flexible missile Adaptive filter Interpolated DFT Frequency estimation Vibration suppression |
|
| 点击此处可从《宇航学报》浏览原始摘要信息 |
|
点击此处可从《宇航学报》下载全文 |
