Transient dynamic characteristics of floating bush structure of marine high pressure fuel pump

The roller-floating bush-pin (RFBP) structure is an important component in high-pressure fuel pumps of marine diesel engines, and its dynamic characteristics have a significant impact on equipment stability. In this study, a simulation model of the transient dynamic characteristics of the double-layer oil film structure was established, taking into account the thermoelastic effect of the structure and the time-varying operating conditions in the fuel pump. A double-layer oil film lubrication system test platform was developed to validate the precision of the simulation model. A comparative analysis was performed to evaluate dynamic parameters of both inner and outer oil films, and the influence of operational parameters and structural parameters on the dynamic characteristics of the structure was studied. It shows that the double-layer oil film structure can significantly reduce the stiffness and damping of the structure compared to the single-layer oil film structure. The dynamic characteristics of the inner oil film exhibit greater sensitivity to variations in operating and structural parameters. The outer oil film has a more pronounced effect on the equivalent dynamic characteristics of the RFBP structure than the inner oil film.