空化振动信号调制特征分析及提取方法  

Feature Extraction of Modulation Signal From Cavitation Vibration

作　　者：苏永生[1] 王永生[1] 颜飞 段向阳[1] 

机构地区：[1]海军工程大学船舶与动力学院,武汉430333 [2]海军广州基地装备修理监修室,广州510715

出　　处：《振动．测试与诊断》2010年第5期570-572,共3页Journal of Vibration,Measurement & Diagnosis

摘　　要：通过分析空化振动信号的调制特征,利用解调和自相关分析技术,从数值仿真和诊断实例对空化振动信号进行特征提取。结果表明,若仅利用相关技术,在时域上可有很好的降噪效果,但提取的调制特征并不明显;利用解调技术能够很好地提取出调制频率。如对调制信号先进行Hilbert包络,再进行相关分析也能较好地提取调制特征。This paper analyzed the modulation feature of cavitation vibration signal.The numerical value simulation and experiment on features of cavitation vibration signals were studied using demodulation and autocorrelation algorithms.It was found that the effect of noise suppression is very good by using autocorrelation in the time domain,while the modulation characteristic is not clear.The modulation frequency was extracted by the demodulation.If the modulation signal was first processed by using Hilbert envelope before the correlation analysis,the modulation feature can also be extracted.

关 键 词：调制特征 解调技术 自相关技术 HILBERT变换 空化 

分 类 号：TV131.33[水利工程—水力学及河流动力学]