基于低频振子与傅里叶变换相结合的低频冲击响应谱修正方法

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振动与冲击 ›› 2021, Vol. 40 ›› Issue (6) : 49-54.

论文

杨宁1，王鹏1，张磊2，闫明1

作者信息 +

Correction method for low frequency shock response spectrums based on the combined use of low frequency oscillator and Fourier transform

YANG Ning1，WANG Peng1，ZHANG Lei2，YAN Ming1

Author information +

文章历史 +

摘要

舰载设备抗冲击试验中的冲击环境通常由加速度信号计算得到的冲击响应谱表征。原始加速度信号含有趋势项误差，导致冲击响应谱低频段谱线严重失真。基于冲击响应谱与傅里叶变换幅值谱数值等价关系，提出一种低频振子等位移线结合傅里叶变换的修正方法，并利用冲击试验机进行验证试验。研究结果表明，应用此修正方法可将冲击响应谱低频段谱线斜率由-3.245 dB/oct提高到5.631 6 dB/oct，同时对中高频段谱线影响极小，能够更为准确的反映舰载设备抗冲击试验中的冲击环境，对于指导舰载设备抗冲击能力的校核工作具有一定的应用价值。

Abstract

The shock environment of shipboard equipments in shock resistance tests is usually characterized by the shock response spectrum calculated with acceleration signals.The original acceleration signal usually contains the trend error, which leads to the severe distortion of low frequency band of the shock response spectrum.Based on the numerical equivalent relationship between the shock response spectrum and the Fourier transform amplitude spectrum, a method combining the fast Fourier transform and low-frequency oscillator for correcting shock signals was proposed, and a shock testing machine was used to verify the method.The research results show that the application of the correction method can improve the slope of the low-frequency band of a shock response spectrum from -3.245 dB/oct to 5.631 6 dB/oct, meanwhile, it has minimal impact on the high-frequency band of the spectrum.The correction method can reflect the impact environment of shipborne equipments in the shock test more accurately, which is of great significance to guide the verification of the shock resistance of shipborne equipments.

导出引用

杨宁1，王鹏1，张磊2，闫明1. 基于低频振子与傅里叶变换相结合的低频冲击响应谱修正方法[J]. 振动与冲击, 2021, 40(6): 49-54

YANG Ning1，WANG Peng1，ZHANG Lei2，YAN Ming1. Correction method for low frequency shock response spectrums based on the combined use of low frequency oscillator and Fourier transform[J]. Journal of Vibration and Shock, 2021, 40(6): 49-54

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