The Finite Element Modeling And Structural Optimization Of The Electric Bicycle Frame

The theory of dynamic design and performance evaluation of electric bicycles and theirs parts are urgent to resolve. Static and dynamic characteristics are studied to the frame of"Qingzhou Yaomeng"by means of CAE. At the same time, it involves in the optimization of the structural strength. The following works and achievements have been accomplished:1. The finite element model of the frame is established in ANSYS. Based on the boundary constraint and the structure characteristic, the frame is segmented by the shell element, the pipe element and the spring element, and the parts of the frame are assembled by means of coupling.2. Based on the finite element model the static and dynamic characteristics of the frame are analyzed. Stress distribution is obtained and the weak links are identified in the frame structure through the static analysis; Key modal parameters, peak stress and displacement of resonance frequency are acquired through modal and harmonic analysis, which lays a foundation for the dynamic optimization design of the frame.3. Modal experiment is carried out by the data acquisition system of"SQlabII"and modal analysis software of ME'scope. According to the standard of "near frequency, similar vibration mode", the test results are compared with finite element simulation results, and they are in a good agreement with each other, which verify the accuracy of the finite element model.4. Strength optimization of the frame is carried out, which allows cutting down the weight of frame by 14.3%. The maximal stress decreases from 98.8MPa to 82.7MPa, and the distribution of stresses is more reasonable.The study of this paper lays a foundation for the improving of the frame structure and the dynamic optimization design of the whole frame, and supplies referenced research methods and practical experience for the electric bicycle-related research.