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Design and Fem Analysis of Mg Framework of Electric Bicycle

Author: PuZuoBing
Tutor: LongSiYuan
School: Chongqing University
Course: Materials Processing Engineering
Keywords: Electric bicycle Magnesium alloy frame Finite Element Method Fatigue Analysis Modal Analysis
CLC: U484
Type: Master's thesis
Year: 2011
Downloads: 97
Quote: 0
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Abstract


Electric bicycle industry, the rapid development in the last ten years, providing people with a lightweight, energy-saving, environment-friendly transport; Meanwhile, energy conservation, improve performance has become an inevitable trend of the development of the transportation industry today. Frame as the core structural components of the electric bicycle, using lightweight materials significantly reduce the weight of the electric bike effectively reduce energy consumption, improve performance and mileage of the vehicle's driving dynamics. The subject with a company to carry out the material substitution exploratory design of a traditional steel electric bicycle frame, lay the foundation for the application of magnesium alloy frame. To this end, in accordance with the overall size of the original steel frame and assembly requirements for magnesium frame easy to fatigue failure, transition members combination of profiles and die-casting macro-composite structure design concept \frame three-dimensional design; then, the establishment of service mechanical model of the frame, and frame service conditions of stress, strain variation and fatigue life distribution and service-mode state for finite element analysis and verification; Finally, according to the analysis of the results. The completion of the frame structure optimization design and forming process characteristics and quality assurance requirements. The main conclusions of the thesis are: (1) According to the original electric bicycle ergonomic dimensions, spare parts, assembly and casting process requirements using CATIA 3D design, build, extruded sections and castings the macro composite magnesium alloy frame three-dimensional model. ② established the service mechanics model of magnesia frame, serving under the frame strength and stiffness requirements, a finite element analysis and service structure to optimize the stress and strain and fatigue. The optimized frame maximum service stress below 40 MPa, the fatigue life of more than 100,000; stiffness to meet the requirements of the safety of the occupants. ③ service mechanical model, the inherent modal analysis the magnesian frame using the finite element method. The results show that: the structural optimization, minimum order natural frequency of the frame 122.4Hz, is higher than the electric bicycles normal service dynamic excitation frequency, indicating that the the electric bike normal service state magnesia frame resonance does not appear to ensure ride comfort . ④ data frame performance analysis of the results and the frame of the process quality requirements, optimize the design process of magnesium alloy frame structure, optimized chassis weighs approximately 1.8 kg, compared with the original steel frame weight reduce 4 kg.

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CLC: > Transportation > Road transport > Other road transport > Bicycle
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