Comparison of linearized vs. non-linearized multibody vehicle model for real-time simulation

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• Real-time simulation with multibody vehicle model is discussed.
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• An analysis method based on linearized constraint equations is proposed.
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• The main application of the proposed method is the vibration analysis.
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• The analysis speed was more than 20 times faster than rigorous multibody simulation.

The performance of a real-time multibody dynamics simulation using linearized constraint equations is discussed. It is known that a small step size is required to simulate a system with very stiff elements such as rubber bushes or a system with high frequency phenomena. Calculation time can be reduced by linearizing constraint equations, and high-speed multibody dynamic analysis with a smaller step size is realized. It is important to acknowledge the degree of accuracy lost when linearized constraint equations are used. We compare linearized and non-linearized simulation models using a model of an actual vehicle and ISO-8608 road profile classifications. Calculation time is evaluated in a real-time analysis environment, and the accuracy of the simulation result is examined.