Establishment and analysis of finite element model

2022-08-24
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Establishment and analysis of finite element model of electric vehicle frame

electric vehicle is a kind of green transportation tool with electric energy as power energy, driven by motor and no pollution. As an important part of the electric vehicle, the frame bears various complex loads from passengers, road excitation and other assemblies. Therefore, the frame structure not only has a direct impact on the appearance of the whole vehicle, but also affects the static and dynamic characteristics of the whole vehicle. Its performance directly affects the safety and comfort of the electric vehicle, and even relates to the success or failure of the whole vehicle design

sharp turning condition is one of the conditions under which the frame of electric vehicle bears a large load when driving. Therefore, this paper analyzes the frame under this working condition through finite element technology, which provides a reference basis for the expensive car umbrella design and frame optimization design of the former

1 establishment of finite element model of electric vehicle frame

in order to ensure the accuracy of frame calculation and small solution scale, under the condition of reflecting the main mechanical properties of electric vehicle frame structure as faithfully as possible, strive to simplify the geometric model of frame structure, so that the finite element model can adopt less number of elements and simple type of elements. The frame of electric vehicle is described as follows. Simplification: simplify the chamfer of the Taigang angle in the frame structure into a right angle, which is conducive to the extraction of the section in the process of modeling and the division of the lattice; The small holes used for assembly or riveting on the frame are ignored, because the small holes only affect the local strength of the frame, and have a small impact on the overall strength of the frame, but have a great impact on the quality of the lattice; The functional parts and non bearing parts are omitted, and these components have little influence on the internal force distribution and deformation of the frame structure, which can be ignored in the modeling

beaml89 unit is used as the unit type of the frame. The electric vehicle frame mainly uses 16 Mn of the same material m, and its material parameters are shown in Table 1

the materials used in the frame are regular rectangular sections. Figure L shows the rectangular sections used in the frame structure, with specifications of 60x40x3 mm, 60x30x2.5 m, and 30x30x2.5 mm respectively

2 frame load analysis

the load on the frame can be divided into static load and dynamic load according to the nature of the action. In the calculation, the dynamic load is mainly measured by the dynamic load coefficient, which depends on three factors: road conditions, vehicle driving conditions and vehicle structural parameters such as suspension stiffness 1. When the vehicle is stationary, the frame only bears the weight of the body, the waste frame of the vehicle, the weight of all assemblies and accessories on the frame and the payload, and the sum of which is called the static load. When the customer completes the design and mapping load, the weight of the frame is applied by applying the gravitational acceleration (9.8 RN/S2), and the applied mass is simplified to the concentrated load acting on each support point. Each passenger is calculated as 65 K9. The basic load of the frame is shown in Table 2. The concentrated force is applied to the corresponding nodes of the frame. The static concentrated force load is shown in Figure 2. Since the electric vehicle is in the running state, its load condition is different from that of the static steel pull plate, which needs to be multiplied by the dynamic load coefficient on the basis of the static load

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