A Search for Impact Origin Using the Vibration Intensity Method

Abstract

In approaches to finding noise and vibration control of machinery, measurement of the vibration energy flow in the structure can give useful information about vibration properties and noise generation mechanisms. This energy flow within the structure is denoted by the vibration intensity vector. By tracing back in the direction of this flow, it is possible to clarify the transmission path of the vibration energy and the location of the exciting source which most affects the response at each point of the structure. In this paper, the vibration energy flow delivered by the impulsive excitation excitation force is measured for a response necessary for a rectanguler plate in the presence of background vibration. The conditions of signal processing of the response necessary for accurate measurement of the vibration intensity vector are also discussed. The direction of the vibration intensity vector is then detected at some points in an operating diesel engine structure and was demonstrated in a valve-sheeting impact.