声音识别结构模态方法的研究

Study on Model Identification Method Using Sound

本文介绍了通过结构振动产生的声辐射进行动力参数的识别方法,对声音识别模态,即基于SIS(Structure-induced Sound)——结构诱发声音的测试方法进行理论上的分析。此方法能减少结构附加传感器质量带来的误差,也可在不方便放置传感器的场合使用。在试验和理论上证明了在一定条件下,基于SIS方法的声音模态测试方法的可行性;并对使用这种识别方法的不同试验情况(声传感器在测试中固定和移动两种情况)进行了具体分析,分析其异同点,探究其原理。验证可知,在一定条件下可以通过声音响应的测试得到结构的模态特性,并且在一定条件下与位移模态所得到结果的可分辨程度差不多,有时甚至优于位移模态。

A method for dynamic parameters identification using sound generated by vibration is introduced.That is based on SIS（Structure-induced Sound） to put up theoretical analysis of test methods.This method can reduce the error caused by the quality of additional sensor.It can also be used in the occasions where it is inconvenient to place sensors.It proves the feasibility of modal test based on SIS under certain conditions.Different methods（acoustic sensor in the test fixed or moved） are analyzed in detail,analyze the similarities and differences,and explore the principles.Through theoretical analysis and experimental verification,the conclusion can carefully come to that modal characteristics can be obtained by sound response under certain conditions.The results are almost the same with the displacement mode,sometimes even better than it.