| Summary: | 碩士 === 國立屏東科技大學 === 機械工程系所 === 102 === The simulation for assembly structures is one of important issues. How to quickly design a machine tool is of concern in industry, and the establishment of simulation methods and procedures is important and beneficial to increase the efficiency of product development. Firstly, this work briefly presents the modal analysis and harmonic response analysis for the proportional viscous damping, multiple degree-of-freedom (MDOF) system. Different damping models are introduced. In particular, the related commands in ANSYS are shown and compared for their usages. A practical cantilever beam structure is considered to determine the frequency response function (FRF) via harmonic response analysis by including damping effects for different damping models. Then, the bolt jointed overlap plates with different plate lengths and different tighten forces on the bolts for applied torques are studied. The finite element model is constructed by brick elements for plates, contact element pairs for contact surfaces, and truss elements for bolts subject to different tighten torques with initial strain effects. Modal analysis can then be performed on the FE model to obtain structural modal parameters, including natural frequencies and mode shapes. Both normal mode and complex mode analyses are considered for undamped and damped structures, respectively. Finally, the damping effect and contact parameters are included into the typical assembly structures to carry out model verification. The equivalent structural model can be validated by examining structural modal parameters. The proposed simulation method in particular for contact simulation and damping effects can be applied to practical assembly structures and enhanced for product design and development.
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