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위성용 전개형 고안정 반사판 안테나 복합재 주반사판 설계 및 해석
김동건,구경래,김현국,송성찬,권성철,임재혁,김영배,Dong-Geon Kim,Kyung-Rae Koo,Hyun-Guk Kim,Sung-Chan Song,Seong-Cheol Kwon,Jae-Hyuk Lim,Young-Bae Kim 한국복합재료학회 2023 Composites research Vol.36 No.3
The deployable reflector antenna consists of 24 unit main reflectors, and is mounted on a launch vehicle in a folded state. This satellite reaches the operating orbit and the antenna of satellite is deployed, and performs a mission. The deployable reflector antenna has the advantage of reduce the storage volume of payload of launch vehicle, allowing large space structures to be mounted in the limited storage space of the launch vehicle. In this paper, structural analysis was performed on the main reflector constituting the deployable reflector antenna, and through this, the initial conceptual design was performed. Lightweight composite main reflector was designed by applying a carbon fiber composite and honeycomb core. The laminate pattern and shape were selected as design variables and a design that satisfies the operation conditions was derived. Then, the performance of the lightweight composite reflector antenna was analyzed by performing detailed structural analysis on modal analysis, quasi-static, thermal gradient, and dynamic behavior.
정영빈,구경래,전성욱,이규영,최성훈,박준홍 한국소음진동공학회 2023 한국소음진동공학회 논문집 Vol.33 No.5
The high-speed train is an eco-friendly transportation system with high energy efficiency and convenience. The increase in operating speeds led to various problems related to the noise and vibration generation. The distributed power type trains are being utilized. The distributed arrangement of power engines is expected to cause different characteristics in terms of interior noise compared to concentrative-power-type trains. This study explains the differences in interior noise between concentrative and distributed power type trains. The noise induced on the trains were analyzed by the rail vibration due to moving loads by the train weights. The sound pressure level and spectral characteristics of interior noise were analyzed according to the operating speed. Both the concentrative- power-type and distributed-power-type trains were found to generate low-pitched noise. The distributed- power-type trains demonstrated a wide distribution of noise in high-frequency bands, demonstrating a relatively gradual decrease in intensity with increasing frequency. A structural vibration by harmonic moving loads was utilized to simulate the high-speed train on a straight rail. By deriving the displacement response while reflecting the actual load distribution of the train, the results indicate a similar tendency to the measured interior noise spectral characteristics. These findings indicate the contribution of rail vibration response to the interior noise of high-speed trains.