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보강 원통형 쉘에 탄성 지지된 기계류에 의한 수중 음향 방사
배수룡(Soo Ryong Bae),정우진(Woo Jin Jung) 한국소음진동공학회 2014 한국소음진동공학회 학술대회논문집 Vol.2014 No.4
Analytical model is derived for the far-field acoustic radiation from machinery installed inside cylindrical shell. The analytical model includes the effect of fluid loading and interactions between periodic ring supports. Transmitted force from machine to a shell can be different by the impedance of shell. In this paper the transmitted force from machinery to a infinite shell through vibration isolator is considered by the impedance of shell. The effect of the shell impedance for acoustic radiation is investigated.
동조질량감쇠기를 이용한 비공진 대역에서의 진동 감소 연구
배수룡(Soo Ryong Bae),정우진(Woo-Jin Jung),한현희(H. H. Han),손성완(S. W. Son) 한국소음진동공학회 2016 한국소음진동공학회 학술대회논문집 Vol.2016 No.4
Submarine is detected by its underwater radiated noise. Machinery is major source of underwater radiated noise of submarine. Generally submarines are designed to not be identical between exciting frequencies of machinery and resonant frequency of structure. This paper presents the trade-off study for tuned mass damper(TMD) which is tuned off resonance frequency of structure to be controlled, tuned in non-resonance bandwidth for applying submarine. The vibration attenuation effect of structure with TMD is verified experimentally in case of TMD on and off. TMD which is tuned in non-resonance bandwidth shows the vibration reduction and response change of structure.
복소 전단탄성계수를 갖는 다층 감쇠보의 유한요소 진동 해석
배승훈(Bae, Seung-Hoon),원성규(Won, Sung-Gyu),정의봉(Jeong, Weui-Bong),조진래(Cho, Jin-Rae),배수룡(Bae, Soo-Ryong) 한국소음진동공학회 2011 한국소음진동공학회 논문집 Vol.21 No.1
In this paper, the general equation of motion of damped sandwich beam with multi-viscoelastic material layer was derived based on the equation presented by Mead and Markus. The viscoelastic layer, which has characteristics of complex shear modulus, was assumed to be dominantly under shear deformation. The equation of motion of n-layered damped sandwich beam in bending could be represented by (n+3)th order ordinary differential equation. Finite element model for the n-layered damped sandwich beam was formulated and programmed using higher order shape functions. Several numerical examples were implemented to show the effects of damped material.