Application of EMD Method in the Analysis of Structural Impulse Signals
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摘要: 介绍一种非线性非平稳信号分析的新方法，此方法是基于经验模态分解（EMD）技术的振动信号分析算法。基于这种方法编写了非线性信号分析程序，把振动信号分解成多个本征函数，在分析过程中比较EMD方法与传统的FFT方法，通过两种方法的对比分析，体现了基于EMD的希尔伯特一黄变换的先进性。对水下爆炸载荷作用下的舰船结构响应进行数值模拟分析，并将EMD方法应用于水下爆炸结构冲击信号分析。通过研究每一个本征函数，从本质上分析水下爆炸冲击加速度信号的组成成分及特点。Abstract: A new method is proposed to analyze the nonlinear and non-stationary signals based upon the technique of empirical mode decomposition (EMD). Analysis program of nonlinear signals is developed on the basis of this method, which it can separate the vibration signals into multiple eigenfunctions. Comparing EMD method with traditional FFT method in the analytical process, HilbertHuang transformation is found to be superior in performance. Structural response of the warship subjected to underwater explosion is simulated numerically, and EMD method is applied to analyzing the structural impulse signals. The components and characteristics of the acceleration signals of underwater explosion impulse are analyzed essentially by researching each of the eigenfunctions. It can be instructive for the analysis of underwater explosion impulse signals.
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Key words:
- underwater explosion /
- emperical mode decomposition /
- eigenfunction /
- impulse signal
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