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Abstract

The aim of this work is to present an optimization problem to design cams for automotive valve trains. The constrained optimization problem uses the control points of the cam profile as design variables. The cam profile is represented by harmonic splines. In addition to the optimization problem the advantages of the calculation of sensitivity information using the direct are determined.

The valve train model is defined by a multi-body system containing discontinuities because of the loss of contact between two consecutive components of the valve train. The objective is to maximize the area below the valve lift, which has a great influence on the gas flow. Constraints for dynamic force, the valve opening and closing phase and the valve lift based on the engine's thermodynamics considerations are taken into account. Furthermore, some constraints for the geometric coordinates of the control points of the cam profile must be imposed.

Keywords

valve train dynamics multi-body dynamics sensitivity analysis optimization Bézier splines

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Using Bézier splines for design optimization of cams regarding valve train dynamics

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