| Summary: | 碩士 === 國立臺北科技大學 === 機電整合研究所 === 97 === This study presents the evaluation of the capability of wind load for the possible folding mechanisms of two-section to four-section folding umbrellas through ADAMS software. Firstly, all the kinematic diagrams of possible folding mechanisms synthesized from six-link-seven-joint, eight-link-ten-joint and ten-link-thirteen-joint are built in ADAMS under the same conditions of horizontal projected area. Then, a varied-direction wind force of 50 N is applied at the end of the tail link of each possible folding mechanism. The criterion for evaluating the capability of wind load between those mechanisms is the maximum reaction force at joints of each mechanism. The one with minimum maximum reaction force at joints is the best folding mechanism.
The obtained results show that the best configuration of folding mechanism for single-slider two-section is 3(M,5), the best configuration of folding mechanism for single-slider three-section is 7(M,13), the best configuration of folding mechanism for single-slider four-section is (4c), the best configuration of folding mechanism for double-slider two-section is 9(M,1), and the best configuration of folding mechanism for double-slider three-section is (17f).
In addition, this study also found that the dimensions of parallel four-bar linkage in the folding mechanism play a significant role regarding the capability of wind load. The design principles for the parallel four-bar linkage in the folding mechanism have been presented. The results of this study could be useful for the design of folding mechanism with optimum capability of wind load.
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