摘要
介绍用于振动信号分析的小波分析基本理论。把小波分析技术应用到车辆振动信号检测中，通过离散二进小波变换，把实际振动信号分解成包含高频和低频两部分的若干层。利用小波分析技术，在合适的分解层中把车辆振动的非平稳时域异常信号检测出来并使其得到准确的时域定位；把路面激励信号从车辆整体振动中分离出来；同时从频域把短时或局部信号的谱检测出来，实现了常规分析方法所不能达到的功能。
The basic theory of wavelet analysis that applied to vibrational signal analysis is presented. The technique of wavelet analysis is used for vibrational signal detection of vehicle. By dyadic discrete wavelet transform, the real signal is decomposed into several layers every of which is composed of two parts: the lower frequency part and higher frequency part. The unsteady and abnormal signal is detected and is better localized in time region using wavelet analysis technique, then the road excitation is separated from car body vibration. The spectrum of short time signal and part signal can be detected from vehicle vibrational signal which is difficult to be detected by common analysis method.
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
1998年第3期108-112,共5页
Transactions of the Chinese Society for Agricultural Machinery
