Numerical Modeling and Experimental Verification for Target Strength of Submerged Objects

J. Ocean Eng. Technol. 2005;19(1):64-70.

CHOI YOUNG-HO;SHIN KEE-CHUL;YOU JIN-SU;KIM JEA-SOO;JOO WON-HO;KIM YOUNG-HYUN;PARK JONG-HYUN;CHOI SANG-MUN;KIM WOO-SHIK;

Division of Ocean Development Engineering, Korea Maritime University;Division of Ocean Development Engineering, Korea Maritime University;Division of Ocean Development Engineering, Korea Maritime University;Division of Ocean Development Engineering, Korea

수중물체에 대한 음향 표적강도의 수치해석과 실험적 검증

최영호;신기철;유진수;김재수;주원호;김영현;박종현;최상문;김우식;

한국해양대학교 해양개발공학부;한국해양대학교 해양개발공학부;한국해양대학교 해양개발공학부;한국해양대학교 해양개발공학부;현대중공업 선박해양연구소;현대중공업 선박해양연구소;현대중공업 선박해양연구소;국방과학연구소;국방과학연구소;

Keywords: Target Strength, Kirchhoff Approximation, Active Detection, Specular Reflection, Scale Target

핵심용어: 표적강도, 키르히호프 근사법, 능동탐지, 거울면반사, 축소표적

Abstract

Target Strength(TS) is an important factor for the detection of the target in an active sonar system: thus the numerical model for the prediction of TS is widely being developed. For the frequency range of several kHz, the most important scattering mechanism is known to be specular reflection, which is largely affected by the geometrical shape of the target. In this paper, a numerical algorithm to predict TS is developed based on the Kirchhoff approximation which is computationally efficient. The developed algorithm is applied to the canonical targets of simple shapes, for which the analytical solutions exist. The numerical results show good agreement with the analytical solutions. Also, the algorithm is applied to more complex scatterers, and is compared with the experimental data obtained in the water tank experiment for the purpose of verifying the developed numerical model. Discussions on the effect of spatial sampling and other aspects of numerical m odeling are presented.