Experimental identification of a nonlinear beam (Time-domain technique)

摘要

In previous papers the authors proposed an experimental identification technique for nonlinear beams and two-dimensional structures. The proposed technique is based on the principle of harmonic balance, and can be classified as a frequency-domain technique. In this paper a new identification technique which can be classified as a time-domain technique is proposed for a nonlinear beam. This technique has less restriction on the type of excitation than the former technique. First, a case in which the data of the excitation contain noise is considered. The technique in this case requires a relatively simple algorithm. Then a case in which the data of both the excitation and the response contain noise is considered. The technique in this case has a wider range of application, although it requires a complicated algorithm. Numerical simulation is conducted to confirm the validity of the proposed technique in both cases.