Optimal Adherent Position of Viscoelastic Material for the Reduction of Sound Power Radiated from the Stiffened Plate

J. Ocean Eng. Technol. 1998;12(2):22-32.

Kim, Sa-Su;Jo, Dae-Seung;An, Ho-Il;Jeong, Sang-Min;

Busan National University;Busan National University;Agency for Defense Development;Busan National University;

보강판의 방사소음저감을 위한 제진재의 최적 위치 선정

김사수;조대승;안호일;정상민;

부산대학교;부산대학교;국방과학연구소;부산대학교;

Keywords: Stiffened Plate, Viscoelastic Material, Sound Radiation Power, Radiation Efficiency, Damping, Sound Intensity

핵심용어: 보강판, 제진재, 음향방사파워, 방사효율, 감쇠, 음향인테시티

Abstract

Many of steel structures having little internal damping consist of stiffened plates. In case that viscoelastic materials are adhered to the stiffened plates for the reduction of structure-borne noise, their effects are varied by the adhered position and dynamic characteristics of the structures as well as their material properties and adhered amount. In this paper, sound reduction effects of viscoelastic materials partially adhered to the different positions of a stiffened steel plate have been investigated by the measurement of vibratory velocity and sound intensity. The results show that optimal adherent positions of viscoelastic materials to reduce sound radiation power are the loop areas of modes.