Abstract
• A new tribo-dynamic model for lubricated translational joints in two-stroke marine engines is established to study its dynamic and lubrication performances. • The fit clearance and profile are investigated so as to reveal their influences on the tribo-dynamic performances. • The use of a quadratic profile is an effective way to form a stable wedge-shaped oil film and avoid unnecessary collisions. • The vibration energy of lubricated translational joints through an optimal quadratic profile is greatly reduced in each frequency band. In this paper, a new tribo-dynamic coupling model for lubricated translational joints in two-stroke marine engines is established to study its dynamic and lubrication performances. Dynamic responses of spatial rigid-flexible multi-body systems are solved by a unified absolute nodal coordinate formulation (ANCF). Mixed lubrication performances are described by the modified Reynolds equation and solved by the finite element method. According to the coupling model, the fit clearance and profile are investigated to uncover their influences on the tribo-dynamic performances. The results show that the use of a quadratic profile is an effective way to form a stable wedge-shaped oil film and avoid unnecessary collisions. An optimal quadratic profile of crosshead is suggested in the light of the above analysis, and its influence on the transmission characteristics of vibration signals in the joint is analyzed. It can be concluded that the vibration energy through the optimal profile is greatly reduced in each frequency band.
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