摘要
针对故障录波数据量庞大的特点,在对故障信号如何进行压缩问题的研究中,对故障信号的时-频特征进行了分析,运用三次B样条小波变换的方法应用于故障录波束据的压缩中。在阈值的选取中,提出了最小极大法,并根据实际需要进行了改进。通过仿真分析,得到以下结论:三次B样条小波有不错的信号分解和重构能力,选择合适的阈值将可以达到7.62:1的压缩比且能较好的保留故障特征。
In view of fault recording data enormous size,how to compress fault signal was researched,local time-frequency characteristics of fault signal was analyzed in this paper,the method of Cubic B-spline wavelet transform was applied to fault recording data compression.Many methods of threshold selection were studied,the least maximum method was presented,and was improved according to reality.Some conclusions are received through simulation analysis: Cubic B-spline wavelet has good capability of signal decomposition and reconstruction,its compression ratio is 7.62:1 and fault characteristics can be reserved better if appropriate threshold is choosed.
出处
《电气技术》
2010年第8期85-88,共4页
Electrical Engineering
关键词
故障录波器
数据压缩
三次B样条小波
阈值选取
最小极大法
fault recorder
data compression
cubic b-spline wavelet
threshold selection
least maximum method
