Variations in Structural Dynamic Characteristics Caused by Changes in Ambient Temperature: I. Experimental

Abstract

When using conventional or laser Doppler vibrometer methodologies, the resonance-dwell technique is used to characterize the response shapes of structures vibrating near resonance. If the structure is large (and/or complex) and if high spatial density data is required, data acquisition could take a significant anmunt of time. During that time, changes in structural characteristics can occur which may cause very large variations in the vibration response amplitude at the same point on the structure. Therefore, an understanding is needed as to why such changes occur and as to how a structure can be stabilized during prolonged dynamic testing. The goal is to make the measured response data as accurate as possible.