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수중 표적 신호 방해를 위한 저주파 능동 반향음 감소 기술 연구
김재필(Jaepil Kim),지유나(Youna Ji),박영철(Young-cheol Park),노응휘(Eunghwy Noh),엄원석(Won-Suk Ohm),최용규(Yonggyu Choi),김대업(Daeup Kim),서영수(Youngsoo Seo) 한국소음진동공학회 2017 한국소음진동공학회 논문집 Vol.27 No.1
Acoustic tiles are typically installed on the surface of pressure vessels in submarines to minimize echoes based on the ships own noise and active sonar. In this study, we studied low frequency active echo reduction techniques to reduce underwater target echo signals. Active control algorithms using tile type projectors and FxLMS logic have been developed and the projectors have been installed in the assumed hull structure. The effectiveness of projectors and control algorithms has been evaluated in time and frequency domain analysis through experiments in the tank.
김상현(Sang-hyun Kim),노응휘(Eunghwy Noh),엄원석(Won-Suk Ohm),전신혁(Sinhyuk Jeon),박영철(Young-cheol Park),최용규(Yonggyu Choi),김대업(Daeup Kim),서영수(Young-soo Seo) 한국소음진동공학회 2017 한국소음진동공학회 논문집 Vol.27 No.7
In an earlier paper we showed that the active control technique using tile projectors was effective in reducing low-frequency echoes from an underwater object. But the validation of the technique was limited to only one dimension in space. To fully evaluate the echo reduction performance, it is necessary to compare the acoustic field before and after the control in at least two dimensions. In this paper, expanding upon our earlier study, we evaluate the performance of the aforementioned technique via two-dimensional scans of the acoustic field. The measurements show that one could achieve at least 6 ㏈ reduction in echo strength throughout the entire scan range.