工作模态分析方法的应用研究

在供水管道系统中,管道系统的振动是噪声污染的主要原因,有必要对管道系统的动态特性进行深入地研究．本文对管道系统实验模型进行工作模态分析,利用带阻滤波技术对含有谐波的响应信号进行预处理,使信号满足白噪声激励条件,生成ODS FRF函数,并拟合得到系统的工作模态参数和振型．与试验模态分析结果相对比,并经实例分析,证实了该工作模态分析理论与方法的可行性,可以为供水系统的减振降噪及改造研究提供可靠的依据．

Study on Operational Modal Analysis Method of Pipe System

The pipe system' vibration is the main reason of noise pollution in the water supply piping system.It is necessary to study thoroughly on the dynamic characteristics of pipe system.Based on the operational modal analysis of the experimental model of pipe system,the responses were preprocessed with the technology of band stop filter to make the signals satisfy with the condition of white noise excitation.The operational modal parameters were obtained and modal shapes were got by curve fitting the ODS FRFs generated.Compared with the results of experimental mode,it proves that the theory and methods of operational modal analysis are practicable.The results provides a reliable foundation for reducing vibration,lowering noise level,and pipe systems rebuilding.