A new coupling tribodynamic model of crosshead slipper-guide system and piston skirt-liner system of low-speed marine diesel engines

- A new tribodynamic model coupling slipper-guide and skirt-liner is built.
- The MEBDF method is used to solve the coupling tribodynamic model efficiently.
- Dynamics of crosshead slipper and piston skirt is present and compared.
- Lubrication properties of slipper-guide and skirt-liner is present and compared.
- Some design parameters of crosshead slipper is investigated for marine engines.

In this paper, considering the coupling effects of the crosshead slipper-guide system and the piston skirt-liner system, a new tribodynamic model is established for the low-speed two-stroke marine diesel engine. Firstly, a dynamic model including the crosshead slipper, the piston, the piston rod, and the crosshead pin is proposed. Then, considering the disciplinary coupling between the dynamic model and the lubrication models, the stiff and nonlinear tribodynamic model is solved with the modified extended backward differentiation formulae (MEBDF). Finally the tribodynamic performances of the crosshead slipper and the piston skirt are analyzed. The simulation results show that the crosshead slipper bears the thrust force and its friction power loss is obviously larger than that of the piston skirt.