| Summary: | 碩士 === 臺灣大學 === 機械工程學研究所 === 95 === The micro spherical joint assembled by precision a micro spherical ball and shell has great potential for application to the micro robots and machines. It can not only deliver the force and moment but also supply high freedom of movement. It is very simple and easy to operate on the machine using the elasticity deflection for the assembly of the micro ball and shell. In order to know the reliability of the micro spherical joint, reliability analytical tools such as failure mode effect and criticality analysis (FMECA) and fault tree analysis (FTA) are used. According to FMECA and FTA, the dimensional mistakes and assembly load were the main factors making the micro joint failure. In order to overcome the problem, deflection of micro spherical shell were simulated under the various conditions of shell angles, radius, and thickness for some materials by means of the finite element method and computer-assisted numerical program ANSYS. The simulated results based on deflection would be helpful for designing the dimension of the micro assembly parts and handling the correct clearance of joints.
Keyword: micro assembly, micro spherical shell, deflection simulation, FEMCA, gap analysis.
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