LSV 측정 정보를 이용한 ODS 와 OMA 의 동시분석 방법

Abstract

It is important not only modal parameters of the structure such as natural frequency, mode shape and damping ratio but also a deflection shape of the structure when it is operating condition to reduce noise and vibration of a system. In case of deflection shape at operating condition, the Operating Deflection Shape (ODS) is will ing used. The dynamic properties of a system can be estimated by a method called Operational Modal Analysis (OMA) during operating condition of the system. However, both techniques are not used at the same model in spite of the same experimental set up. Because OMA technique is only applicable under the assumption that the force causing vibration of the system should be White Noise, OMA is limited to use for huge buildings such as large vessel. In this paper, it extends the application of OMA by using a signal processing technique and it shows experimental convenience because a data obtained by single experiment can be applied to ODS and OMA at the same time