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Optimal design of a sparse planar array sensor for underwater vehicles

수중 운동체용 희소 평면배열 센서의 최적 설계

Muhammad Shakeel Afzal1
,
Yongrae Roh1*
무하마드 샤킬 아프잘 1
,
노 용래1*
1School of Mechanical Engineering, Kyungpook National University
*교신저자. *Corresponding Author. 
31 January 2018. pp. 53-59
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Abstract

In this study, a new design method is developed to optimize the structure of an underwater sparse array sensor. The purpose of this research is to design the structure of a sparse array that has the performance equivalent to a fully sampled array. The directional factor of a sparse planar array is derived as a function of the structural parameters of the array. With the derived equation, the structure of the sparse array sensor is designed to have the performance equivalent to that of the fully array sensor through structural optimization of the number and location of transmitting and receiving elements in the array. The designed sparse array sensor shows beam patterns very close to those of the fully array sensor in terms of PSLL (Peak Side Lobe Level) and MLBW (Main Lobe Beam Width), which confirms the effectiveness of the present optimal design method. Further, the validity of the analytic beam patterns is verified by comparing them with those from the FEA (Finite Element Analysis) of the optimized sparse array structure.

Keywords
Sparse array
Optimization
PSLL (Peak Side Lobe Level)
MLBW (Main Lobe Beam Width)
FEA (Finite Element Analysis)

본 연구에서는 수중 희소배열 센서의 구조를 최적설계하기 위한 새로운 방안을 개발하였다. 본 연구의 목적은 전체 배열센서와 대등한 성능을 가지는 희소 배열센서의 구조를 설계하는 것이다. 우선 희소 평면배열 센서의 지향계수를 배열 구조변수들의 함수로 유도하였다. 유도된 식을 사용하여 희소 배열센서 구성 소자의 개수와 위치를 최적화 함으로써 그 성능이 전체 배열 센서의 성능과 대등하도록 희소배열 센서의 구조를 설계하였다. 설계된 희소 배열센서는 최대 부엽 레벨과 주엽의 빔폭 면에서 전체 배열 센서와 대등한 빔 패턴을 보였는데, 이로써 본 연구의 최적설계 기법의 효용성이 확인되었다. 나아가 수식에 의한 빔 패턴 해석 결과의 타당성은 최적화된 희소배열 구조에 대한 유한요소해석 결과와 비교함으로써 검증하였다.

키워드
희소배열
최적화
최대부엽레벨
주엽빔폭
유한요소해석
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Information
  • Publisher :The Acoustical Society of Korea
  • Publisher(Ko) :한국음향학회
  • Journal Title :The Journal of the Acoustical Society of Korea
  • Journal Title(Ko) :한국음향학회지
  • Volume : 37
  • No :1
  • Pages :53-59
  • Received Date : 2017-11-15
  • Accepted Date : 2018-01-30
  • DOI :https://doi.org/10.7776/ASK.2017.37.1.053
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