N-pole 종류의 FSS가 결합된 복합재료 구조의잔류응력과 전파투과특성
Study on Thermal Residual Stresses and Transmission Characteristics in N-pole Type Frequency Selective Surface Embedded Composite Structures
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초록
본 논문에서는 주파수 선택적 투과막(FSS)이 결합된 복합재료 구조에서 구성 재료 간의 열팽창계수 차이로 잔류응력이 발생하므로 이로 인한 층간분리나 FSS의 손상 등 구조적인 파손 가능성과 잔류응력으로 인하여 변형된 FSS가 전파투과특성에 미치는 영향에 대하여 연구하였다. FSS는 단위요소의 종류, 설계변수, 배열에 따라 전파특성이 다르게 나타나므로, PSO 알고리즘을 이용하여 다이폴이 목표주파수에서 투과특성을 갖도록 설계하고 그 설계치수를 다른 N-pole 종류 단위요소(Tripole, Cross dipole, Jerusalem cross)에 적용하여, 복합재료 구조에 발생하는 잔류응력과 그로인한 구조적 손상과 전파특성을 영향성을 관찰하고 FSS패턴과 복합재료의 적층 변화에 따라 비교하였다.
Abstract
In this paper, the delamination and failures in frequency selected surface(FSS) caused by residual stresses in the FSS embedded hybrid composites due to the difference between the coefficients of thermal expansion of components and the transmission characteristic changes due to deformation of FSS patterns by residual stresses were studied. FSS may have different electromagnetic characteristics depending on the type of element, design variables, and arrangement. Design variables of dipole FSS were determined using PSO(Particle Swarm Optimization) to obtain the transmission characteristic for the target resonant frequency. Subsequently, the design variables of other types of N-pole(tripole, cross dipole, and Jerusalem cross) were determined based on the dimensions of the dipole for the comparisons of residual stresses of FSS embedded composite structures and transmission characteristics. In addition, effects of FSS pattern, and stacking sequence of composite laminates were considered.
참고문헌 (11)
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