本論文主要分析電動摩托車車架強度以及耐久計算，透過有限元素法進行電動摩托車車架之模態分析、剛性分析、標準工況分析、整車強度分析以及疲勞損傷計算。分析時，分別以前叉、主車架以及後搖臂三部分之結構進行。模態分析以及剛性分析為計算前叉、主車架以及後搖臂之模態頻率以及剛性值，並且判斷結構之振動變形行為。標準工況分析計算前叉、主車架以及後搖臂在一般路面與嚴苛路面時，結構之受力行為，透過多體動力學節點力的計算，再使用有限元素的分析，判斷結構面臨各工況所受應力大小以及其材料是否滿足強度需求。整車強度分析將前叉、主車架以及後搖臂組合在一起，針對整車結構進行強度之非線性分析，探討整車結構面臨嚴苛條件下，材料是否滿足強度需求。疲勞損傷計算分析結構之耐久性，透過多體動力學之計算時域訊號以及有限元素單位力計算，分析結構之損傷值，判斷結構是否滿足耐久需求。最後再根據各工況分析整理出後搖臂、主車架以及前叉應力集中之位置及應力值。

This thesis mainly investigates the strength and durability of the electric motorcycle frame. By using the finite element method,the modal analysis, stiffness analysis, standard events analysis, vehicle strength analysis and fatigue damage analysis of the electric motorcycle frame are carried out. Modal and stiffness analysis calculate the modal frequency and stiffness value of the front, frame and swing-arm structures to understand the vibration and deformation behavior of the vehicle. Standard event analysis focuses on the force behavior of the front, frame and swing arm under normal as well as severe road conditions by first using the Multi-body dynamics to calculate nodal forces, and then using finite element analysis to evaluate the stresses of the structures and to check whether the material satisfies the strength requirements. In vehicle strength analysis in which the front, frame and swing-arm portions are combined, the nonlinear analysis is applied to explore if the material satisfies the strength requirements under the severe conditions. Fatigue damage analysis exploring the durability of the structure is executed with the aid of two kinds of data: time-domain signals calculated by using multi-body dynamic, and the nodal forces under unit-force acting at certain node obtained by the finite element method.Finally, the locations of the stress concentration and the values of the maximum stress in the front, frame, and swing-arm structures according to the analysis of each load condition are sorted out.

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