진동수 영역 모달파라미터-하중 동시추정 기법

Abstract

In this study, a frequency domain framework for estimating simultaneously the modal parameter and input load from the measured (modal) response of multi degree of freedom(MDOF) system is proposed. It is a technique to identify the modal and load model parameters, by theoretically developing a mathematical input model, and comparing it with the identified load from the assumed modal parameters. The proposed technique has inherent difference to the conventional modal identification in that it can effectively treat the shape of the load spectrum. In order to verify the estimation method proposed in this study, it was applied to a SDOF analytic model. From the simulation results, it was found that this technique has high reliability of modal parameter estimation and immunity to noise included in the response. It can be seen that it has robustness to the load model order and can stably estimate the model parameters. Furthermore, it is needed that this technique can be applied in various load conditions such as vortex induced load and buffeting load of full scale structure, later.