基于双树复小波变换的转静碰摩响应分析

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振动与冲击 ›› 2014, Vol. 33 ›› Issue (22) : 106-110.

论文

基于双树复小波变换的转静碰摩响应分析

李纪永1 李舜酩1 陈晓红2 江星星1

作者信息 +

Rotor-stator rub-impact response analyses based on DTCWT

Li jiyong1 Li Shunming 1 CHEN Xiaohong2 JIANG Xingxing1

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文章历史 +

摘要

转静碰摩响应的消噪及特征提取是碰摩故障诊断中关键问题，构造分段圆弧平滑阈值函数，利用小波、小波包及双树复小波分别对非平稳信号进行降噪，以信噪比为指标判断降噪效果，表明了所构造阈值函数消噪的高效性。计算单转子局部碰摩动态响应，用双树复小波对位移响应进行特征提取，与小波及小波包相比，其双树实小波近似解析性及采样插值互补特点，完整提取了动态响应特征，减小了信息丢失。仿真及转子碰摩实验结果表明文中方法的有效性。

Abstract

Rotor-stator rub-impact response de-noising and its characteristics extraction are key problems of fault diagnose, a piecewise smooth threshold function was constructed for wavelet de-noising, the non-stationary signal is de-noised separately by Wavelet, Wavelet Packets and Dual-tree Complex Wavelet Transform(DTCWT), take SNR (Signal to Noise Ratio)to evaluate the de-noising effect, the results reveals that the constructed threshold function is high active in de-noising. Then single rotor rub dynamic response was calculated, decomposed by DTCWT, the dynamic response was exactly extracted due to dual tree wavelet approximate analytical and sampling interpolation complementary. The simulation and experimental results show that the proposed methods are effective.

导出引用

李纪永李舜酩陈晓红江星星. 基于双树复小波变换的转静碰摩响应分析[J]. 振动与冲击, 2014, 33(22): 106-110

Li jiyong Li Shunming CHEN Xiaohong JIANG Xingxing. Rotor-stator rub-impact response analyses based on DTCWT[J]. Journal of Vibration and Shock, 2014, 33(22): 106-110