| Summary: | 碩士 === 東南科技大學 === 機械工程研究所 === 104 === This thesis investigates the support locations of an in-vehicle infotainment system, which provides and displays the driving condition, vehicle information and audio and video entertainment. By studying the support positions of the infotainment system, the natural frequencies of the system are elevated and the possibility of resonance due to road conditions and engine excitation is reduced.
In this study, a 3D CAD software Catia was used to construct a simplified model, with seven components, of the in-vehicle infotainment system. Three of the components were built by a composition of different materials and were homogenized by equivalent densities. Finite element software ANSYS was employed to perform modal analysis and it was found that the first analysis mode correlated greatly with the system supports. Experimental modal testing on the infotainment system using ME’scope VES software acquired four test modes, with the first test mode at 98.8 Hz and its mode shape very similar to the first analysis mode. The finite element model was subsequently updated by 24 springs with adjustable spring constants at 8 screw locations. The updated model has the first analysis mode at 98.816 Hz, very close to the test counterpart. Based on this updated model, four different support locations were simulated and the resulted first modes for the four cases are 131.52 Hz, 125.63 Hz, 124.69 Hz and 111.13 Hz, all of them higher than the original design.
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