改进小波阈值降噪方法在振动-高动态离心复合试验控制系统中的应用

蒋辰玮; 严侠; 毛勇建

doi:10.7643/ issn.1672-9242.2024.06.016

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装备环境工程 ›› 2024, Vol. 21 ›› Issue (6) : 119-126. DOI: 10.7643/ issn.1672-9242.2024.06.016

重大工程装备

改进小波阈值降噪方法在振动-高动态离心复合试验控制系统中的应用

蒋辰玮, 严侠^*, 毛勇建

作者信息 +

Application of Improved Wavelet Threshold De-noising Method in the High-performed Dynamic Centrifuge-Vibration Composite System

JIANG Chenwei, YAN Xia^*, MAO Yongjian

Author information +

文章历史 +

摘要

目的针对振动-高动态离心复合试验控制系统中控制信号受噪声干扰导致控制效果不佳的情况,进行降噪处理,以提升试验控制能力。方法利用改进的小波阈值降噪方法,对振动-高动态离心复合试验控制系统中控制信号进行降噪处理,通过分析信号特性,结合小波阈值降噪方法原理,提出阈值准则随分解尺度自适应动态变化的改进方法。结果通过本文改进方法和其他小波阈值降噪方法的对比分析表明,本文所提方法对于振动-高动态离心系统所存在的中高频噪声干扰起到了明显抑制作用,可有效保留控制信号特征,获得了更佳的综合降噪效果,信噪比提升近10 dB,满足试验控制所需的降噪要求。结论采用自适应动态变化的阈值准则的小波阈值降噪方法对振动-高动态离心复合试验系统的控制信号进行降噪处理有效且可靠,可对后续相关试验技术研究方向提供一种可行思路。

Abstract

In order to solve the problem that the control signal in the vibration-high dynamic centrifugal composite test control system is disturbed by noise, leading to poor control effect, the work aims to carry out noise reduction to improve the test control ability. The improved wavelet threshold de-noising method was used to de-noise the control signal in the vibration-high dynamic centrifugal composite test control system. By analyzing the signal characteristics and combining the principle of wavelet threshold de-noising method, an improved method of threshold criterion changing adaptively with decomposition scale was proposed. The comparative analysis of the improved method and other wavelet threshold noise reduction methods showed that the proposed method could significantly suppress the medium and high frequency noise interference in the vibration-high dynamic centrifugal system, effectively retain the characteristics of the control signal, and obtain a better comprehensive noise reduction effect. The signal-to-noise ratio was improved by nearly 10 dB, which met the noise reduction requirements of the test control. The wavelet threshold de-noising method based on adaptive dynamic threshold criterion is effective and reliable for de-noising the control signal of vibration-high dynamic centrifugal composite test system, which can provide a feasible idea for the research direction of related test technology in the following.

导出引用

蒋辰玮, 严侠, 毛勇建. 改进小波阈值降噪方法在振动-高动态离心复合试验控制系统中的应用[J]. 装备环境工程. 2024, 21(6): 119-126 https://doi.org/10.7643/ issn.1672-9242.2024.06.016

JIANG Chenwei, YAN Xia, MAO Yongjian. Application of Improved Wavelet Threshold De-noising Method in the High-performed Dynamic Centrifuge-Vibration Composite System[J]. Equipment Environmental Engineering. 2024, 21(6): 119-126 https://doi.org/10.7643/ issn.1672-9242.2024.06.016

中图分类号： TN911

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