摘要
根据岩石霍布金逊压杆（SHPB）试验测试信号的高噪声与瞬态非平稳特点，利用小波包分析技术对其进行消噪处理。所得结果与传统方法所得结果比较发现：通常经过应变仪滤波和数据邻值平均法所得的测试结果是不准确的。用能够进行时频多尺度分辨的小波包变换方法进行信号的去噪处理。在揭示信号本身的时频信息的同时，能尽可能不失真地在强噪环境下重现有效信号，将这种方法用于岩石SHPB测试信号的去噪处理，能够得到可靠的结果。
In sight of the highly-noised, instantaneous and non-stationary characteristics of signal in SHPB test of rock, the wavelet-packets analysis technique is used to de-noise the test signal. Through compare between the wavelet-packets de-noised signal with that obtained from conventional method, it is found that the results gotten through strain gauge filtering and successive-values-averaging method is inaccurate. Wavelet packets analysis, as a new and promising tool in signal analyzing, has good resolution in time and scale aspects. The technique is used to de-noise signal from SHPB test of rock, the resolution is obtained in time and frequency domains simultaneously in multi-scales, and the de-noised results have neglectable errorness, the results turn out to be more reliable.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2005年第A01期4779-4783,共5页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金重大项目（50490272,50490274）
国家自然科学基金资助项目（10472134）
