碟形天線之流固耦合分析與最佳化

Abstract

設計一個新的碟形天線，在量產前為達到規格的要求，必需要先經過風洞測試，以確保其在自然的風吹雨打的環境中，不會產生永久的變形而影響其接收訊號的品質。傳統上，碟形天線的結構強度設計，譬如碟盤的厚度，必需使用試誤法來反覆的在風洞中測試，一旦結構強度不夠而測試失敗則必需重來，但若為了強化結構又使用過多的材料導致生產成本無法降低，經過多次的測試不但耗費金錢也耗費時間。 本研究嘗試以流固耦合的方式，將計算流體力學分析軟體與有限元素應力分析軟體整合，對碟形天線中，碟盤以及支撐桿這兩部份做強度分析，並將此分析與風洞實驗進行驗証，最後再與最佳化軟體連結，對碟盤以及連結器做節省使用材料的最佳化設計。

Before mass-producing a new type of dish antenna, this dish antenna must go through the survival test of wind tunnel to make sure it can work well under the natural wind condition. Traditionally, the design of the strength of the dish antenna uses the method of trial and error according to the wind tunnel tests. This procedure costs a lot of time and money. The main objective of this research is to utilize the numerical scheme of fluid-structure interaction, which integrates CFD and FEM, to analyze the strength of the dish and the connecting pipe. After verified by the results from wind tunnel test, this approach was further incorporated with optimization software to reduce the cost of the antenna dish and the connector.