Experimental Identification of Mechanical System with Character Matrices : 2nd Report, Application of Reduction which can Keep Physical Meaning of the System

Abstract

Experimental identification of a mechanical system with character matrices has been the subject of several discussions. As the result, if the degree of freedom of identification is equal to that of the system to be identified, then almost complete character matrices can be derived. However, this condition is seldom satisfied and therefore some kind of compromise is required to obtain the matrices, that is, whether to ignore the physical meaning of the matrices or to ignore the discrepancy in frequency response functions. On the other hand, identification with character matrices can be considered as a kind of reduction of the degree of freedom. Consideration is given from this point of view, and an improved technique which avoids the conflicts is proposed and examined numerically and experimentally.