Abstract
A half-car vibration model of an electric vehicle driven by rear in-wheel motors was developed using bond graph theory and the modular modeling method. Based on the bond graph model, modal analysis was carried out to study the vibration characteristics of the electric vehicle. To verify the effectiveness of the established model, the results were compared to ones computed on the ground of modal analysis and Newton equations. The comparison shows that the vibration model of the electric vehicle based on bond graph theory not only is able to better compute the natural frequency but also can easily determine the deformation mode, momentum mode, and other isomorphism modes and describe the dynamic characteristics of an electric vehicle driven by in-wheel motors more comprehensively than other modal analysis methods.
Highlights
Vehicle vibration has been a hot spot in the field of automotive research
bond graph (BG) theory and the modular modeling method are applied to vibration analysis of the IWM-driven electric vehicles (EVs)
(1) The modal analysis results for the IWM-driven EVs based on BG theory show that A for capacitive components in the system, a low excitation frequency primarily affects deformation of the suspension and the tire, and the high excitation frequency significantly affects the deformation of the hub bearing and that of the rear suspension and tire; B for the inertia component, the firstand second-order frequencies primarily impact the vibration of the car body, whereas the third- and fifth-order frequencies primarily affect the vibration of the IWM stator and rotor components
Summary
Vehicle vibration has been a hot spot in the field of automotive research. One method of studying vehicle vibration is modal analysis. Modal analysis must first be performed for the IWM-driven EVs. At present, most vibration models and analyses of vehicles are based on Lagrangian or Newtonian theory [1, 2]. The theory elucidates a complete causal relationship and can clearly express the relationship between the mathematical model and the physical model It is recognized as the most suitable modeling method of the state space equation, which is obtained from the domain of the physical system directly, and it is widely used in a number of disciplines [3,4,5,6,7]. BG theory and the modular modeling method are applied to the modal analysis of an IWM-driven EV. Modal analysis is conducted via the Newton method to verify the correctness and applicability of the established model
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