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서영수(Youngsoo Seo),함일배(Ilbae Ham),전재진(Jaejin Jeon) 한국소음진동공학회 2013 한국소음진동공학회 논문집 Vol.23 No.10
The requirement of acoustic performance about underwater acoustic material which is used in underwater environment more increases. Underwater acoustic material was made by viscoelastic material such as a rubber and a polyurethane etc. In order to increase an acoustic performance, several kinds of inclusions were added to viscoelastic material. In this paper, acoustic modelling and analysis techniques were introduced and the acoustic characteristics of underwater acoustic material were studied. Echo reduction and transmission loss were calculated with volume fraction of inclusion in the material. Also the characteristic impedance and the input impedance of underwater acoustic material were obtained and effects on the echo reduction and transmission loss of material were discussed.
서영수(Seo, Youngsoo),박경훈(Park, Kyenghoon),전재진(Jeon, Jaejin) 한국소음진동공학회 2013 한국소음진동공학회 논문집 Vol.23 No.8
Fluid-borne noise produced by seawater circulating pumps propagates through the seawater connected pipes and radiates from the hull opening of a ship. This noise causes the increases of underwater radiated noise and self noise of ship. To reduce the noise propagation through the seawater connected pipes, absorptive silencer must be needed. In this paper, theoretical model to analyze the transmission loss of absorptive silencer was presented and the design parameters of absorptive silencer were verified. Theoretical calculations were performed according to a thickness, a length, an internal pressure and mechanical properties of its absorptive material in order to analyze the characteristics of absorptive silencer. From the theoretical calculation results, the absorptive silencer was manufactured and transmission loss was measured in the test facilities. The results of theory and measurement are compared and discussed.
강명환(Myengwhan Kang),서영수(Youngsoo Seo),신구균(Ku-kyun Shin),전재진(Jaejin Jeon) 한국소음진동공학회 2011 한국소음진동공학회 학술대회논문집 Vol.2011 No.4
For developing acoustic window, transmission loss in accordance with incident angle was calculated and compared with measurement results. In design stage, the material choice of acoustic window is very important because the material is parameter of transmission loss and structural strength. In order to analyze the effect of material properties on transmission loss, the parametric studies were carried out and the results were discussed in this paper.
소나 음향창의 설계 인자가 난류 유동 유기 자체 소음의 전달 함수에 미치는 영향 해석
신구균(Shin, Ku-Kyun),서영수(Seo, Youngsoo),강명환(Kang, Myengwhan),전재진(Jeon, Jaejin) 한국소음진동공학회 2013 한국소음진동공학회 논문집 Vol.23 No.1
Turbulent boundary layer noise is already a significant contributor to sonar self noise. For developing acoustic window of sonar system to reduce self noise, a parametric study of design factors of acoustic window is presented. Distance of sensor array from acoustic window, materials of acoustic window and characteristics of damping layer are studied as design factors to influence in the characteristics of the transfer function of self noise. As the result, these design factors make change the characteristics of transfer function slightly. Among design factors the location of sensor array is most important parameter in the self noise reduction
48V 마일드 하이브리드 자동차용 전동 컴프레서를 위한 통합구조 전력모듈의 다중물리 시뮬레이션
성지환(Jihwan Seong),김민기(Minki Kim),임장묵(Jangmuk Lim),전재진(Jaejin Jeon),한호범(Hobeom Han),박세민(Semin Park),최현규(Hyunkyu Choi),박유철(Yucheol Park),오필경(Pilkyoung Oh),김상민(Sangmin Kim),권태석(Taesuk Kwon),윤상원(SangWon Y 한국자동차공학회 2019 한국자동차공학회 부문종합 학술대회 Vol.2019 No.5
소나 음향창의 설계 인자가 난류 유동 유기 자체 소음의 전달 함수에 미치는 영향 해석
신구균(Ku-kyun Shin),서영수(Youngsoo Seo),강명환(Myengwhan Kang),전재진(Jaejin Jeon) 한국소음진동공학회 2012 한국소음진동공학회 학술대회논문집 Vol.2012 No.10
Turbulent boundary layer noise is already a significant contributor to sonar self noise. For developing acoustic window of sonar system to reduce self noise, a parametric study of design factors of acoustic window is presented. Distance of sensor array from acoustic window, material and damping layer are studied as design factors to influence in the characteristics of the transfer function of self noise. As the result these design factors make change the characteristics of transfer function slightly. Among design factors the location of sensor array is most important parameter in the self noise reduction.