Zero-drift analysis and processing of explosion shock with low distortion
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摘要: 短时的爆炸瞬态冲击信号，具有冲击频带宽、幅值高特点，在测试过程中，常常会有信号失真的零漂现象。本文中详细分析零漂现象产生的原因，对比各种修正方法的优缺点，提出基于经验模态分解（empirical mode decomposition，EMD）改进高效算法，结合频域窗函数滤波方法，这种新修正方法，能够较好弥补现行修正方法的缺陷，可为瞬态冲击信号时域模拟提供失真较小的环境条件数据。Abstract: Due to its wide shock frequency and high amplitude, an explosion shock signal is commonly characterized by the phenomenon of signal zero drift in its measuring shock tests. In this study, we examined the origin of this zero drift phenomenon, compared the advantages and disadvantages of various methods used to rectify it, and proposed an improved version of the empirical mode decomposition (EMD) method with the window function filter in the frequency domain. The result shows that our improved EMD method can make up for the defects suffered by the current methods and provide data for explosion shock signal processing with low distortion.
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Key words:
- empirical mode decomposition /
- explosion transient shock /
- zero drift /
- data processing
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图 9 3种方法修正后高频段冲击响应谱
Figure 9. High-frequency shock response spectrum rectified using three methods
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