研究針對 AMS-02 磁譜儀中（Power Distribution System, PDS）散熱器之結構，在火箭發射階段所承受的動態環境，進行模態分析與補強設計。由於太空載具對質量極為敏感，結構質量的增加將直接影響發射成本與任務效益，因此如何在不顯著增加質量的情況下提升結構自然頻率，以避免與發射載具產生共振並且同時降低原構型構改的風險，是本研究的核心問題。
研究中完成PDS 散熱器的完整建模與初步模態分析，辨識第一模態變形區域並提出以複合材料補片進行局部補強的方式，輔以有限元素分析進行效益評估。補片設計涵蓋鋁合金與三種疊層方式之碳纖維複材，並針對補強範圍規劃全範圍補強與局部集中補強兩種構型進行比較，以探討不同補強面積之質量效益。
模擬結果顯示，多角度疊層碳纖補片能在維持輕量的情況下有效提升第一模態自然頻率。所提出之補強設計流程可應用於類似航太結構之模態調整需求，並有助於提升其在發射動態環境下的結構穩定性與可調性。

In this study, it was focused on the structural analysis and reinforcement design of the Power Distribution System (PDS) radiator within the AMS-02 spectrometer, specifically addressing the dynamic loads experienced during rocket launch. Given the extreme sensitivity of spacecraft to mass, any increase in structural weight directly impacts launch costs and mission efficiency. Therefore, the core objective of this research is to adjust the natural frequency of the structure without significantly increasing its mass, thereby avoiding resonance with the launch vehicle.

A complete finite element model of the PDS radiator was developed, and preliminary modal analysis was conducted to identify the critical deformation regions in the first mode. A localized reinforcement strategy using composite patches was proposed, with parametric design and performance evaluation carried out through finite element simulations. The patch designs included aluminum alloy and three carbon fiber composite layups, with the same thickness, and the patch was applied to regions exhibiting the most severe modal responses. Two reinforcement coverage ranges were investigated: a full-coverage patch following the deformation envelope (0.854 m²) and a reduced-area localized patch focusing on the peak-strain region (0.298 m²).

Simulation results indicate that carbon fiber patches with multi-angle layups can effectively increase the natural frequency while maintaining low weight. The outcomes of this study offer a practical modal reinforcement approach for similar aerospace structures, enhancing structural stability and mission reliability under extreme launch conditions.

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