Purpose

The modern missile has low uncertain and wide range vibration frequency. The conventional notch filter with the fixed notch frequency is less effective than that of the adaptive notch filter (ANF) in vibration suppression for the time-varying vibration frequency.

Design/methodology/approach

To overcome the drawback, a novel method is based on frequency estimators made by interpolation of three discrete Fourier transform (DFT) spectral lines. The modified frequency estimators based on the interpolation of three DFT spectral lines are presented to identify and track the vibration frequency. Then the notch frequencies of multiple ANFs are real-timely tuned according to estimators.

Findings

Finally, taking the second-order flexible missile as an example, the performance of the proposed method is verified. The verified simulation results show that multiple ANFs are effective in vibration suppression.

Practical implications

Cascading multiple ANFs to achieve multi-order vibration suppression is more efficient and feasible than conventional fixed-parameter notch filtering.

Originality/value

The frequency estimation method based on three DFT spectral lines proposed in this paper can effectively identify and track signals in the noise environment. Compared with conventional methods, the method pretended in this paper has high identification accuracy and a stronger ability to track signals. It can meet the fast frequency identification requirements of the actual flexible missile.

中文翻译：

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柔性导弹减振的多重自适应陷波滤波新方法

目的

现代导弹具有较低的不确定性和宽范围的振动频率。具有固定陷波频率的常规陷波滤波器在抑制随时间变化的振动频率方面的效果不如自适应陷波滤波器（ANF）有效。

设计/方法/方法

为了克服该缺点，一种新方法基于通过对三个离散傅里叶变换（DFT）谱线进行插值而制成的频率估计器。提出了基于三条DFT谱线插值的改进频率估计器，以识别和跟踪振动频率。然后，根据估计量实时调整多个ANF的陷波频率。

发现

最后以二阶柔性导弹为例，验证了该方法的性能。验证的仿真结果表明，多个ANF可以有效地抑制振动。

实际影响

级联多个ANF以实现多级振动抑制比常规的固定参数陷波滤波更为有效和可行。

创意/价值

本文提出的基于三条DFT谱线的频率估计方法可以有效地识别和跟踪噪声环境中的信号。与传统方法相比，本文提出的方法具有较高的识别精度和较强的信号跟踪能力。它可以满足实际柔性导弹的快速频率识别要求。