This article presents a technique, based on the screw-theory of kinematics, to parametrically generate complex 3D suspension lookup tables from a small set of parameters describing kinematic attributes such as bump-steer, rollcenter height, camber gain and wheel recession. These look-up tables are typically utilized in commercial real-time vehicle models for the simulation of vehicle handling and ride to aid the chassis development. This method aims to replace the current state-of-the-art whereby the above-mentioned look-up tables are generated via complex multi-body models and/or suspension test-rig data – both of which incur significant costs and effort and are typically not available or mature in the vehicle concept phase. The efficiency of this methodology aides in front-loading of the vehicle dynamics development by allowing detailed vehicle dynamics simulations to occur at a very early stage of the vehicle concept phase and using very little input data. An example use-case is presented in which the vehicle dynamics effects of a significant roll-center modification is evaluated for a vehicle platform concept.

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Front loading the vehicle dynamics development via parametric modeling of axle elasto-kinematics

  • Tim Wright

摘要

This article presents a technique, based on the screw-theory of kinematics, to parametrically generate complex 3D suspension lookup tables from a small set of parameters describing kinematic attributes such as bump-steer, rollcenter height, camber gain and wheel recession. These look-up tables are typically utilized in commercial real-time vehicle models for the simulation of vehicle handling and ride to aid the chassis development. This method aims to replace the current state-of-the-art whereby the above-mentioned look-up tables are generated via complex multi-body models and/or suspension test-rig data – both of which incur significant costs and effort and are typically not available or mature in the vehicle concept phase. The efficiency of this methodology aides in front-loading of the vehicle dynamics development by allowing detailed vehicle dynamics simulations to occur at a very early stage of the vehicle concept phase and using very little input data. An example use-case is presented in which the vehicle dynamics effects of a significant roll-center modification is evaluated for a vehicle platform concept.