Abstract
The dynamics analysis of the rear suspension system of the Fiat Panda III with electric motors mounted in wheels is presented in the paper. The simplified model of this system modeled using the multibody system dynamics method and the MSC. Adams package is proposed. In order to validate the proposed numerical model, the road tests were carried out consisting on passing the vehicle without motors in wheels at constant speed through the obstacle. The vertical displacement of the center of the vehicle wheel was measured during the tests. During the validation, parameters of the wheel-to-road contact, stiffness coefficients of springs and shock absorber damping coefficients of the suspension of the simulation model were modified so that the numerical results were consistent with the experiment. Further, such a tuned model was used to simulate the motion of suspension with the motors mounted into the wheels. The obtained results were validated, obtaining the accepted compatibility. In the following, a series of calculations was carried out in order to analyze the influence of stiffness coefficients of springs and shock absorber damping coefficients on the dynamic response of the suspension.
Highlights
Almost a quarter of carbon dioxide (CO2) emissions come from transport, and urban mobility accounts for 40% of all carbon dioxide emissions from road transport
Values of the Root Mean Square (RMS) and Vibration Dose Values (VDV) factors obtained for an acceleration time-histories of the passenger sitting above the wheel for different spring stiffness and shock absorber damping coefficient are shown in Figs 17 and 18
The paper presents a preliminary analysis of dynamics of the Fiat Panda III rear suspension system including electric motors mounted into wheels
Summary
Almost a quarter of carbon dioxide (CO2) emissions come from transport, and urban mobility accounts for 40% of all carbon dioxide emissions from road transport. The article presents possible solutions for drive systems of electric vehicles, describing their advantages and disadvantages. A model for simulating the work of the car suspension with mounted two electric motors in the wheel hubs was presented. This solution, due to the increase of unsprung masses, may cause a deterioration of comfort of travel, which caused that the problem of vertical vibrations of the suspension was addressed. The use of electric drive motors in the wheels affects the mass increase of the unsprung vehicle and this can affect the comfort of traveling. The transmission of vibrations to passengers is related to the height of the road unevenness and the stiffness and damping of the vibrations by the suspension of the wheel. The results of the simulations were verified with the experimental tests
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