Optimizing the shape of top piston ring face using inverse method

Purpose – This study aims at proposing an approach for optimizing the shape of the top piston ring face for minimum friction force using an inverse method. The shape of the top piston ring face determines the amount of oil distribution in the interface of the ring and liner. Therefore, the shape has a significant impact on the tribological performance of this interface. Design/methodology/approach – The shape of the ring face is represented by a polynomial function and is based on the load analysis of the ring. The optimization of the shape was performed using the Sequential Quadratic Programming method. The minimizing of the friction parameter at the interface was considered during the solving process to obtain an optimum ring shape. Findings – The optimized high degree of the shape of the ring face could lead to a reduced friction parameter. The proposed method could be applied for the tribological design and optimization of the piston rings. Research limitations/implications – There still need effort to investigate the effect of design parameters (e.g. property of lubricant)on the optimization of the ring face. Originality/value – The subject matter is important and the method has practical value.