非平稳振动信号的角域重采样小波解调分析方法  

Angle domain resampling and wavelet demodulation for nonstationary vibration signal

作　　者：吴剑[1] 代冀阳[1] 孙秀霞[2] 

机构地区：[1]南昌航空大学无损检测技术教育部重点实验室,南昌330063 [2]空军工程大学工程学院,西安710038

出　　处：《振动与冲击》2009年第5期137-141,159,共6页Journal of Vibration and Shock

基　　金：航空科技支撑基金(05C56001)

摘　　要：对于旋转设备的非平稳多分量振动信号,在已知转速变化规律的情况下,采用转速跟踪分析中的角域重采样方法使其变成阶比值固定的信号,再利用小波解调方法的带通滤波与解调分析两重功能,就能从混合振动信号中提取出各个阶比分量并获得对应的解析信号。该方法成功地解决了旋转设备严重非平稳振动信号的分析问题,并可拓展应用于至其它非平稳信号的分析。拓展算法具有类似HHT的算法结构,适用面广。文中同时给出的数值计算方法配合采用了细化分析及快速解卷积运算,保证了整体算法的稳定性、精确性和快速性,克服了HHT稳定性差的缺陷。论文最后对航空发动机试车过程中的振动数据采用本文方法和其它方法的应用效果进行了分析对比,证明了该方法的有效性。The method of angle domain resampling and wavelet demodulation can successfully solve the serious nonstationary vibration analysis problem of rotating machinery,and it can easily be extended to other nonstationary signal analysis problems.The extended method has the similar frame as HHT,so it has a wide application area.In combination with zoom analysis as well as fast deconvolution based on FFT & IFFT,the corresponding numerical calculation method was given,which ensures the calculation to be stable,accurate and rapid,and overcomes the HHT's deficiency of bad stability.With the proposed method,the analytic answer of the vibration signal during an aero engine's test drive process was solved and compared with the results of different other methods to prove its validity.

关 键 词：非平稳 振动分析 转速跟踪 计算阶比 小波 解调分析 HHT 

分 类 号：TN911.72[电子电信—通信与信息系统]