一般機架式伺服器裝載於42U高度機櫃時，因硬碟、主機板、散熱器、電源供應器及機箱本體等等的重量影響下，使得伺服器基座產生下沉變形現象。假若此下沉變形量超過預期設計的規格，將使得機櫃內機架式伺服器的裝載率下降，提高企業內的IT機房建置成本。本論文依據一般常用的肋條類型做結構強度分析與討論，找出結構補強效果最佳的肋條類型，以改善伺服器基座的下沉變形現象，符合預期設計規格，提高機櫃內的機架式伺服器的裝載率。
本研究主要分成四個部分，首先應用Pro/Engineer裡的Top-down Design觀念來建立機架式伺服器的零件配置，並且對肋條進行設計評估；接著應用ANSYS Workbench裡的靜力結構分析模組建構分析模型，並且進行伺服器基座肋條結構分析；然後選擇補強效果較佳的肋條，運用田口方法進行實驗規劃，以求得肋條的最佳化尺寸參數；最後進行伺服器基座的樣品製作，藉由樣品的下沉變形量尺寸量測數據，來驗證結構分析的趨勢及可信度。

In general, rack mount servers are mounted on a 42U height rack. However, the cumulative weight of hard drives, mother boards, heat sinks and power supplies often cause sagging in the chassis base. If the extent of sagging exceeds the design specification, it causes a reduced mounting rate and creates higher construction costs for building an IT room. This study utilizes the most widely used rib type to perform the strength analysis and discussion, and to identify the best rib type for optimal structure reinforcement, so as to solve the sagging problem for chassis base, to meet the design specifications, and to raise server mounting rate.
This study is divided into four parts. First, top-down design concept of Pro/Engineer software is adopted to establish the component layout of rack mount server, and perform rib assessment. Then, a structure analysis is established by using the static structural mode in ANSYS Workbench to analyze rib strength for a chassis base. Next, a rib with the best reinforcement effects is selected and the Taguchi’s method is employed for experiment planning in order to obtain optimal dimensional parameters. Finally, a prototype for the chassis base is made and the prototype’s sag is measured. The measurement data is collected to validate the feasibility of the structural analysis proposed in this thesis.

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