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Bicycles are classified into different kinds by their function, among others are road bicycle, mountain bicycle, cross-country bicycle and many others. However, different kinds of bicycle frames have specific geometric design for different purposes.
The research is to discuss the effect of geometric dimension on bike frame stiffness. Firstly, use four different brands of hardtail mountain bike with 26 and 27.5 inch frame geometry, then stimulate how outer force functions on seat tube, bottom bracket and head tube with analysis software. Discuss the distribution of frame deformation and calculate bike frame stiffness to know how it works. Secondly, select a 27.5 inch rim bike frame from one of the four brands and parameterize the dimension of seat tube center to center, seat tube angle and BB drop. This is done by changing dimension of single part to realize the effect of dimension in different part on frame deformation. Lastly, optimize the bike frame geometry.
The research is done by a finite element analysis software─ANSYS workbench, to simulate the deformation of forced bike frame. Finite element analysis provide a fast and easy way to obtain the relation between the bike frame geometric design and its deformation. By combining with engineering analysis to analyze the properties of bike frame, a bike prototype can be developed until satisfactory results are acquired. The research provides the benefits of lowered development cost, shortened development time, enhanced quality and performance for a bike frame.
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