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산란을 고려한 프로펠러 소음과 변동압력의 시간영역 해석 및 실선 적용 연구
A study of propeller noise and pressure fluctuation analysis considering scattering effects in time-domain and some applications to ships

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Authors
김종도
Advisor
홍석윤
Major
공과대학 조선해양공학과
Issue Date
2012-08
Publisher
서울대학교 대학원
Keywords
Underwater propeller noisescatteringacoustic analogypressure fluctuation
Description
학위논문 (박사)-- 서울대학교 대학원 : 조선해양공학과, 2012. 8. 홍석윤.
Abstract
Using time domain acoustic analogy, a method to predict the sound field and hull pressure fluctuation generated by unsteady sheet cavitation on marine propeller has been developed. The Formulation 1A of Farassat is introduced to enhance theoretical understanding of this work, and it is applied to modeling scattered sound field by fuselage boundary. To express direct sound field from sheet cavitation, a new solution is studied. It could consider Dopplers effect and also express near field and far field separately. A small sphere model is used to verify the present method. Computed acoustic field pressures around the sphere are compared with the exact solution and the numerical results show good agreement. The method to obtain the pressure fluctuation is described and PFBEM (Power Flow Boundary Element Method) is introduced to interpolate pressure fluctuation over the all area of stern model. To compute vibrational response and propeller induced noise at the same time coupling method is applied to propeller noise analysis, TDFEM (Time Domain Finite Element Method) is coupled with the acoustic analogy. Absorption boundary condition is newly applied to acoustic analogy and it makes it possible to calculate interior noise of closed room like cavitation tunnel. In addition the way to consider free surface effect when the underwater noise is analyzed is introduced. Finally the software SPIN (System for Propeller Induced Noise) is developed to simulate propeller noise and pressure fluctuation.
Language
Korean
URI
https://hdl.handle.net/10371/119995
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Naval Architecture and Ocean Engineering (조선해양공학과)Theses (Ph.D. / Sc.D._조선해양공학과)
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