摘要
针对冗余第二代小波包分解存在频带错位与误差积累缺陷,分析了其产生的原因,研究了相应的消除算法,并将频带错位与误差积累消除算法融合,提出了一种改进的冗余第二代小波包变换.该变换既避免了冗余第二代小波包变换中存在的频带错位缺陷,又消除了误差积累缺陷,非常适合于机械故障信号的预处理,并成功应用于直升机齿轮箱故障诊断中.应用结果表明:相比于冗余第二代小波包变换与第二代小波包变换,改进的冗余第二代小波包能实现对信号无频带错位、无误差积累、无频率折叠地分解,能更准确有效地提取隐藏在强噪声和其他强干扰背景下故障特征信息.
Aimed at the frequency band derangement and error propagation in redundant second generation wavelet packet transform, the reason was researched and the algorithms to overcome the shortcomings were proposed. Then, an improved redundant second generation wavelet packet transform was presented whose both frequency band derangement and error propagation were avoided, and it was applied successfully to fault diagnosis of helicopter gearbox. The results indicate that the improved redundant second generation wavelet packet can more truly and effectively detect the fault fea- ture submerged the strong interference context, owing to the elimination of error propagation, frequency aliasing and frequency derangement.
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2014年第5期40-46,共7页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
十二五预研基金资助项目(4010801020202)
关键词
第二代小波包
冗余第二代小波包
频带错位
误差积累
故障诊断
second generation wavelet packet
redundant second generation wavelet packet
band de-rangement
error propagation
fault diagnosis
