`High Stability Telescope Structure (HSTS)` supports the mirror and the image detector such as the telescope structure. HSTS is designed to be secure against dynamic load, vibration and shock gen-erated at the time of launching satellites and to maintain the dimensional stability in a vacuum state and repeated heat load on the orbit in order to preserve the performance of the optical system. Korea has started later than in other countries of the research related to space. Therefore, our country was the ineffective design based on existing technologies. In this study, a systematic and efficient method for HSTS design has been proposed. The methods satisfy the desired requirements, and prevent over design and reduce the calculation time. To the optimal design for the HSTS, to reflect the characteristics of the optical structure of the composite material were considered with a discrete variable is a continuous variable. Considering the sampling method for discrete variables, a sequential sampling method using a genetic algorithm is proposed. In addition, in order to improve computational efficiency, and generates Kriging surrogate model of HSTS. Due to accuracy assessment based on the Cross-Validation error, Basis Screening Kriging(BS Kriging) model was chosen as highly accurate Kriging surrogate model. HSTS Optimization is conducted using BS Kriging, and applied Genetic Algorithm as optimization method. As a result, The final shape of the HSTS of reduced weight compared to conventional models have been derived. The amount of calculation was reduced by use of Kriging model.
본 연구에서는 인공위성의 광학탑재체 등을 지지하는 광구조체를 대상으로 최적설계를 수행한다. 광구조체의 경우 발사 시에 동력학적 하중을 견디며 우주 궤도상에서의 반복적인 열 하중 하에서도 안정적으로 설계되어 광학성능을 감소시키지 않아야 한다. 따라서 광구조체는 이러한 특성을 만족시키는 복합재를 경통의 소재로 사용한다. 효율적인 최적설계를 위해, 크리깅 근사모델을 이용하여 계산량을 감소시킬 수 있었다. 또한 크리깅 근사모델의 정확도를 평가하는 지표로서 교차검증오차의 평균 값을 사용하여 다양한 크리깅 근사모델 중 정확도가 높은 Basis-Screening 크리깅 근사모델을 선정하여 광구조체 최적설계에 활용하였다. 또한 복합재의 특성을 반영하고자, 적층개수를 변수로 고려하여 실험점 추출의 단계부터 이산변수와 연속변수가 동시에 고려될 수 있는 순차적 실험점 추출 방법을 제시 및 적용하였다.
