Abstract
This paper considers a modern approach of K&C parameters stability analysis using the suspension MBS model of a short-wheelbase electric vehicle. According to the results of the work, even minor errors in suspension hardpoints positioning when overlaying can greatly affect the K&C parameters of car suspensions. Using MBS models, quasi-static K&C events have been simulated. In the same way the dependences of the suspension K&C parameters are numerically determined. Moreover, these calculations were made with different hardpoints positions for joints of wishbones fastening on a frame, and joint of a steering rod with a steering rack. The influence of suspension hardpoints displacement on the K&C parameters of the vehicle was estimated. As a result, recommendations are made for production positioning tolerances of suspension hardpoints in order to avoid deterioration of K&C parameters. Basically, the appearance of inaccuracies in the positioning of hardpoints leads to critical changes in anti-dive, anti-lift, kingpin inclination angle, bump camber and bump steer parameters.
Highlights
Car suspension is a very complex mechanical system
The sensitivity of K&C parameters was estimated depending on the displacements of the suspension hardpoints by 5 mm along the vertical and horizontal axes
The calculaton was based on the MBS models of electric vehicle suspensions (MacPherson - front, double wishbone - rear)
Summary
Design of kinematic suspension scheme is used to determine the position of the fasteners of the suspension elements (hardpoints) [1,2,3]. Geometric dimensions and position of the suspension hardpoints (calculated positions of joints and bushings centers) affect the K&C parameters of the suspension, which determine the handling, stability and patency of the vehicle [4,5,6,7,8,9,10,11,12]. At the stage of designing a new chassis scheme, the required K&C parameters are laid. According to the parameters geometric dimensions and the position of the hardpoints are selected. Experience shows that the number of such parameters can be more than 50 for each suspension type
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