Study on Engine Vibration Signal Denoising Method of SURE Block Threshold Based on DT-CWPT
A mechanical vibration signal denoise method of SURE block threshold based on DT-CWPT was proposed. The mechanical condition monitoring is always aims to removing the background noise and preserving the useful information more effectively. The presented method chooses the threshold level and block size by minimizing Steins unbiased risk estimate which is more adaptive and superior performance and can obtain higher signal-to-noise than the common NeighCoeff. Simultaneously, combine the method with the DT-CWPTs characteristic of approximately shift-invariant and optimal representation for the signal And the method was applied to denoise the engine vibration signal which has the property of complex frequency domain and nonstationary and time-variant.Testing results show that the proposed method can effectively compress the noise and the denoised signal has better classification performance.
denoising vibration signal block threshold dual tree complez wavelet
WU Dinghai ZHANG Peilin REN Guoquan LI Bing CAO Jianjun
Shijiazhuang Mechanical Engineering College Shijiazhuang,China The Research Institute of Nanjing Telecommunication Technology Naniing,China
国际会议
长沙
英文
719-722
2009-04-11（万方平台首次上网日期，不代表论文的发表时间）