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압축센싱 기법을 이용한 날개끝 보텍스 캐비테이션 발생위치 및 강도 추정 연구
김용현(Yong-Hyun Kim),설한신(HanShin Seol),이정훈(Jeung-Hoon Lee),정홍석(HongSeok Jeong) 한국소음진동공학회 2020 한국소음진동공학회 논문집 Vol.30 No.4
Currently, in propeller performance evaluation, localization and source-strength estimation of propeller cavitation are emphasized. To change this, in the current investigation, a practical estimation method using a compressive sensing framework with a hydrophone array was established. Since the signal produced by the propeller cavitation can be regarded as cyclostationary, we use the spectral kurtosis for the provision of an appropriate frequency band where the minimization problem in CS is resolved. The proposed scheme is verified through a model-scale test conducted in the large cavitation tunnel at Korea Research Institute of Ships and Ocean Engineering. For an incipient case, the localization of cavitation exhibited fairly good correlation with high-speed images. In addition, consistent increments in the estimated strength were observed with the development of cavitation.
수중방사소음 예측을 위한 빔형성 방법 기반 추진기 캐비테이션 음원준위 추정
김용현(Yong-Hyun Kim),설한신(Hanshin Seol),이정훈(Jeung-Hoon Lee),정홍석(Hongseok Jeong) 한국소음진동공학회 2021 한국소음진동공학회 논문집 Vol.31 No.2
In general, the prediction of underwater radiated noise requires source level information. This study proposes a method for the source level estimation of propeller cavitation based on the beamforming method. The proposed method obtains the source level information by determining the source strength corresponding to the estimated cavitation position. As the solution of the minimization problem can be determined analytically rather than numerically, it has the advantage of fast computational time. The proposed method is verified through a model-scale test conducted in a large cavitation tunnel of Korea Research Institute of Ships and Ocean Engineering. The estimated source level of the propeller cavitation matches well with a transfer-function-based method in the frequency band that satisfies the far-field. In addition, another method for reducing the computational time is considered through determining the source level from the cavitation position and sound pressure level.