| Summary: | 碩士 === 國立臺灣海洋大學 === 機械與機電工程學系 === 104 === Amphibious vehicles originally are used for military purposes, whereas they are now commonly used for civilian applications such as salvage, patrol, detection, and tourism purposes. One of the important applications demanded by the amphibious vehicle is that its suspension system need to be retractable. To reduce the drag force of the vehicle while operating on water, it is necessary for an amphibious vehicle to possess the retractable suspension system. The thesis focused on the optimization problem of the retractable suspension system of amphibious vehicles. To construct the dimensional model of the new suspension mechanisms, we referred to the suspension of the all-terrain vehicle and related references. The kinematic and force analysis of the retractable suspension systems were analyzed using vector-loop method by simplifying the model as planar mechanisms. The results of the analysis were verified by the commercial package ADAMS. The objectives of the optimization problem were to reduce the joint forces and driving force as well as to increase the elevation of the wheel during the retraction process. We adopted two-dimensional kinematic analysis for the optimization process. A comparison was made between the performance indices before and after the optimization process. The result showed that the total joint force were decreased by as much as 40%, and the elevation were increased by 10%.
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