The Optimal Dimensional Synthesis for the Rear Suspension of Bike

• Main Authors: Liang-Yu You, 尤亮畬
• Other Authors: Jung-Hung Sun
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/95841352284385003445

碩士 === 國立高雄第一科技大學 === 機械與自動化工程研究所 === 103 === The rear suspension of bike is designed to confine the bounce track of the rear axle in limited scope, and to move along the desired path. The frame work is like the linkage of matching the designated coupler curve, and the trajectory of rear axle is equated to coupler curve. Fitting the coupler curve could reduce the errors of bouncing rear axle track, and that would enhance comfortable of riding. Different from finding the optimal dimensions of matching the coupler curve of linkage, the parts of rear suspension in link need to be transformed by spring for absorbing the vibration energy. That would give some additional restrictions called leverage ratio on finding the size of the design. Under the constraints, the optimal dimensions of matching the coupler curve would be changed. The object of this paper is following the method of six-bar linkage for path generation with two coupler curves. Design goals of reducing the tracking error and matching leverage ratio should be coincided in optimal dimensional synthesis for the rear suspension of bike. The linkage of bike would be simplified to Watt-II-type of six-bar linkage, where two of links are converted into spring, and restricting the angles of the two links as the compression of spring. Tracking error of bicycle wheel and leverage ratio are set as the design requirements. Combining with the Genetic Algorithm and the proposed optimum model, the optimal dimensions for the rear suspension of bike are found. The result of example shows that the track error is reduced by 32%, and the leverage also meets the requirement at the same time.