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Strength Analysis And Modal Analysis Of Automotive Rims
Apr 26, 2017


When the car is traveling, the vibration problem caused by the uneven pavement of the engine, the transmission system and the wheel, and so on, stimulates the car's vibration and affects the ride comfort of the car. Usually, the vibration will increase much when the car is traveling on a rugged road. The vibration of uneven pavement is the basic input of car vibration, and its frequency range is about 0.5-25Hz. Although the car passed the time is very short, but will make a bigger impact on the sedan, immediately will cause the people to ride feeling uncomfortable, the impact of the ride comfort, serious damage to the health of the passengers or the transport of goods caused damage. To solve the vibration problem of stochastic uneven pavement excitation is an important basis for improving the ride comfort, safety and reliability of the vehicle. Automotive rims manufacturers using three-dimensional solid modelling software Pro/EN-GINEER to a certain type of car wheel rims made three-dimensional modeling, and with the finite element software ABAQUS Seamless integration, the strength analysis and modal analysis.

1. Steel RIMS Solid Model

Because of the complexity of the structure of the sedan rims, the chamfering on the rim of the hub and spokes has little effect on the model dynamics analysis. Therefore, the hub and spoke edge of the chamfer ignored, to reduce the size of the finite element model, only the quality of its conversion to the appropriate location. In this paper, the three-dimensional modeling software used in automotive research field is Pro/ENGI-NEER for a certain wheel rims, as shown in Figure 1. The steel rims model is mainly composed of three parts: spokes, wheel cores and wheels. Hub, spoke by high-quality sheet metal stamping, to improve the spokes rigid, often stamping into fluctuating shape, at the same time to reduce the weight of the steel rims with a long curved holes.

2. Finite element model of steel rims

The Pro/ENGINEER of the steel rim entity model is saved as x__t format through ABAQUS, to achieve seamless integration of Pro/ENGINEER and ABAQUS. Steel rims material for AM91D, elastic modulus E=45Gpa, Poisson's ratio μ = 0.35, allowable maximum bending stress [σ]=250Mpa.] The maximum diameter of the rims is 406x182 (MMXMM). The moving constraint of the y direction and z direction and the rotation constraint of x direction and z direction are added on the bolt holes. For the first order tetrahedron (C3D4), the steel rims model is discretized, and 167,502 cells are formed. Fig. 2 is a finite element model for car rims.