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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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dc.contributor.advisor홍석윤-
dc.contributor.author김종도-
dc.date.accessioned2017-07-13T08:58:58Z-
dc.date.available2017-07-13T08:58:58Z-
dc.date.issued2012-08-
dc.identifier.other000000004503-
dc.identifier.urihttps://hdl.handle.net/10371/119995-
dc.description학위논문 (박사)-- 서울대학교 대학원 : 조선해양공학과, 2012. 8. 홍석윤.-
dc.description.abstractUsing 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.-
dc.description.tableofcontents1. 서론 1
1.1. 연구배경 및 현황 1
1.2. 논문 구성 8
2. 프로펠러 소음 10
2.1. 비공동 소음 11
2.1.1. 배경이론 11
2.1.2. 해석 결과 17
2.2. 공동 소음 23
2.2.1. 파동방정식의 유도 25
2.2.2. Sheet cavitation noise 28
2.2.3. 해석 결과 32
3. 산란을 고려한 프로펠러소음 해석 46
3.1. 산란을 고려한 음향상사법 46
3.2. 산란체 표면의 압력 49
3.3. 관찰점에서의 압력 53
4. 변동압력 해석 62
4.1. 산란을 고려한 변동압력 해석 및 검증 62
4.2. 변동압력 계측 실험과의 비교 85
4.3. PFBEM을 이용한 변동압력 역추정 93
4.3.1. 음향파워흐름해석법 95
4.3.2. 음향파워흐름경계요소법 101
4.3.3. 파워흐름경계요소법을 활용한 변동압력 역추정 120
5. 구조음향 연성을 고려한 프로펠러 소음해석 124
5.1. 유한요소법 124
5.1.1. Kirchhoff 평판의 횡진동에 대한 운동방정식 유도 124
5.1.2. Kirchhoff 평판의 유한요소 유도 144
5.1.3. TDFEM (Time Domain Finite Element Method) 154
5.1.4. 해석 결과 157
5.2. Coupling methodology 163
6. 응용 해석 및 기법 연구 170
6.1. 산란체 표면의 흡음률 고려 기법 170
6.1.1. 이론 연구 170
6.1.2. 흡음률을 고려한 변동압력 해석 172
6.2. 자유수면 효과를 고려한 수중 소음 해석 177
7. 프로그램 개발 및 실선 적용 185
7.1. SPIN (System for Propeller Induced Noise) 개발 185
7.2. 실선 적용 및 해석 189
8. 결론 및 향후 추천 과제 207
8.1. 결론 207
8.2. 향후 추천 과제 210
참고 문헌 212
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dc.formatapplication/pdf-
dc.format.extent9251201 bytes-
dc.format.mediumapplication/pdf-
dc.language.isoko-
dc.publisher서울대학교 대학원-
dc.subjectUnderwater propeller noise-
dc.subjectscattering-
dc.subjectacoustic analogy-
dc.subjectpressure fluctuation-
dc.title산란을 고려한 프로펠러 소음과 변동압력의 시간영역 해석 및 실선 적용 연구-
dc.title.alternativeA study of propeller noise and pressure fluctuation analysis considering scattering effects in time-domain and some applications to ships-
dc.typeThesis-
dc.description.degreeDoctor-
dc.citation.pagesCCXVI,216-
dc.contributor.affiliation공과대학 조선해양공학과-
dc.date.awarded2012-08-
Appears in Collections:
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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