Basic Consideration on Precision Improvement of Frequency Response Function using Burst Random Controlled Excitation

Abstract

In the case of very lightly damped structures that the leakage error can be a serious problem, burst random controlled excitation is very useful for obtaining the reliable frequency response function. Here burst random controlled excitation uses velocity feedback to control the system response to decay enough within the sampling time. In ordinary measurement, velocity is usually acquired by transforming the measured acceleratory signal. As a matter of course, measured signal contains noise. There is a possibility that the transforming acceleration into velocity may increase the influence of noise. Consequently authors consider that velocity obtained from acceleratory signal is uncertain to apply to the above purpose. So in this paper we choose force feedback instead of velocity feedback and examine burst random controlled excitation. As a result of it some interesting knowledges are obatined.