바닥 가진 시 PH15-7Mo 브라켓 진동 피로 파괴에 따른 모달 파라미터 추정 (Modal Parameter Estimation for PH15-7Mo Bracket Vibration Fatigue Failure with a Base Excitation)

서지정보

· 발행기관 : 한국소음진동공학회
· 수록지 정보 : 한국소음진동공학회논문집 / 33권 / 6호 / 663 ~ 670페이지
· 저자명 : 강다솜, 김선민, 배승훈, 조대원, 김대환, 박태국, 백승훈, 양민혁, 도승환

초록

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.

영어초록

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.

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