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바닥 가진 시 PH15-7Mo 브라켓 진동 피로 파괴에 따른 모달 파라미터 추정
강다솜(Da Som Kang),김선민(Seonmin Kim),배승훈(Seung-Hoon Bae),조대원(Dae-Won Cho),김대환(Dae-Hwan Kim),박태국(Tae-Kook Park),백승훈(Seunghun Baek),양민혁(Minhyeok Yang),도승환(Seunghwan Do) 한국소음진동공학회 2023 한국소음진동공학회 논문집 Vol.33 No.6
In this study, a method for estimating modal parameters (natural frequency, damping ratio, mode shape) in vibration fatigue testing of brackets with base excitation is proposed. The circle fitting method was used to estimate the damping ratio from the acceleration transmissibility without considering external forces. The transmissibility equation was approximated and converted to a circular equation, and the center of the circle was found to be determined by the modal parameters. The experimental results showed that the damping and natural frequency changed rapidly following significant changes in the center of the circle representing the system; the change in the mode can be estimated. The proposed method allowed for estimation of the modal parameters without force measurement during the vibration test.