本論文的主要目標是對一個既有的電動摩托車後搖臂結構，在不降低原本性能或不低於容許範圍內的情況下，進行輕量化設計。執行流程為先對原始後搖臂結構進行各項數據收集，其中包括標準工況分析、剛性分析、整車強度分析、單位力分析、及疲勞分析。接著對結構弱處進行補強或重新設計，以提升後搖臂結構之性能，才有餘裕將低應力區域部件進行減重，以提升結構之用料效率。
本文有詳細說明各項分析之設定、方法、原因、及結果。其中標準工況分析又分為一般使用工況及嚴苛使用工況，一般使用工況是假設用戶正常操駕摩托車之情況；嚴苛使用工況則假定為用戶做極限操駕之情況。剛性分析包含扭轉、彎曲、以及側向。整車強度分析將針對後輪落地工況進行講解。疲勞分析將對三種路面進行分析驗證，分別為連續凸起路面、連續凹陷路面、及連續交錯路面。值得一提的是，隨著輕量化設計的進行，標準工況及疲勞分析都將經過多體動力學重新計算，以獲得新的動態節點力，並重新進行分析驗證，以確保後搖臂輕量化設計方案之安全可靠性。
除了考慮到結構分析，本研究也將著重考慮零件製造的可行性與經濟性，也因此多次更改設計並進行多次分析，而得到最後的後搖臂輕量化設計方案。

The main objective of this paper is to conduct a lightweight design for an existing electric motorcycle swingarm structure without compromising its original performance or falling below acceptable limits. The execution process involves collecting various data on the original swing-arm structure, including standard operating condition analysis, rigidity analysis, overall vehicle strength analysis, unit force analysis, and fatigue analysis. The structure's weaknesses are then reinforced or redesigned to enhance the performance of the swing-arm structure, allowing for weight reduction in low-stress areas to improve material efficiency.
The paper provides detailed explanations of the settings, methods, reasons, and results for each analysis. The standard operating condition analysis is further divided into normal usage conditions and severe usage conditions. Normal usage conditions assume the motorcycle is operated under typical circumstances, while severe usage conditions consider extreme driving scenarios. Rigidity analysis includes torsion, bending, and lateral forces. The overall vehicle strength analysis focuses on the rear-wheel landing condition. Fatigue analysis verifies the performance on three types of road surfaces: continuous convex, continuous concave, and continuous alternating surfaces. It is worth mentioning that as the lightweight design progresses, both the standard operating condition and fatigue analysis undergo multi-body dynamics recalculations to obtain new dynamic nodal forces. These forces are then reanalyzed to ensure the safety and reliability of the lightweight swing-arm design.
In addition to structural analysis, this research also emphasizes the feasibility and cost-effectiveness of component manufacturing. Therefore, multiple design iterations and analyses were conducted to achieve the final lightweight swing-arm design solution.

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