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  

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

作　　者：蒋辰玮 严侠[1] 毛勇建[1] JIANG Chenwei;YAN Xia;MAO Yongjian(Institute of Systems Engineering,China Academy of Engineering Physics,Sichuan Mianyang 621900,China)

机构地区：[1]中国工程物理研究院总体工程研究所,四川绵阳621900

出　　处：《装备环境工程》2024年第6期119-126,共8页Equipment Environmental Engineering

基　　金：国防技术基础重点项目(JSHS2018212C001);国家自然科学基金(12072247)。

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。In order to solve the problem that the control signal in the vibration-high dynamic centrifugal composite test con-trol 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 wave-let 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 dy-namic centrifugal system,effectively retain the characteristics of the control signal,and obtain a better comprehensive noise re-duction 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.

关 键 词：高动态 振动-离心复合控制系统 噪声 小波阈值降噪方法 阈值准则 动态变化 

分 类 号：TN911[电子电信—通信与信息系统]