실무책임 : 구가람 박사과정, 유서윤 박사과정

Main figure : Analytic moving monopole and dipole noise sources

Analytic noise sources : Moving monopole and dipole noise sources

Validation of FW-H in-house code results with analytic solution and other researcher : The acoustic pressure in observer and directivity

Validation of FW-H in-house code results with analytic solution : The acoustic field in time domain for the monopole source

Validation of FW-H in-house code results with analytic solution : The acoustic field in time domain for the dipole source

The noise propagation in the inner region of integral source surface

The effect of integral source surface

Validation of FW-H in-house code results with ANSYS Fluent results for permeable surface / The investigation of the grid-type effect

Validation of FW-H in-house code results with ANSYS Fluent results for impermeable surface

Quadrupole correction effect on FW-H equation to reduce the spurious noise on source surface

The signal processing procedure : discretization and the kind of signal processing error

The signal processing procedure : Fourier transform and challenging points of numerical approach

The signal processing procedure : algorithm for signal processing

Verification of signal processing in-house code algorithm by comparing with the measurement results : Overlap 0 %

Verification of signal processing in-house code algorithm by comparing with the measurement results : Overlap 80 %

Verification of signal processing in-house code algorithm by comparing with the measurement results : Band spectrum and Power spectral density (PSD)

Verification of signal processing in-house code algorithm by comparing with the measurement results : OASPL (dB & dBA)

연구목적

• FW-H 방정식 기반 복합전산음향해석 기법 개발

연구내용

• 이론해 기반 소음원 모사 (홀극, 쌍극)
• Ffowcs Williams and Hawking 방정식 기반 음향해석 알고리즘 개발
• 이론해 소음 결과와 비교/검증
• 상용코드 ANSYS Fluent 소음해석 결과와 비교/검증
• 계측기 결과와 비교를 통한 신호처리 절차 정립

지원기관 및 공동연구기관

• 선박해양플랜트연구소(KRISO)

관련 발표논문

• 구가람, 유서윤, 정철웅, "사중극자 보정 Ffowcs Williams and Hawkings 방정식을 이용한 수중익형 공동 유동소음에 대한 수치적 고찰", 한국음향학회지 제37권 제5호, pp.263-270, 2018.07.