Abstract:Aimed at the problem that it is difficult to use accurately mathematical functions to deal with the dynamic load changes of drive shafts, the analysis method of approximate solution for dynamic load was proposed based on the theory of rigid body dynamics and by considering the rigid and elastic vibration features, and a mathematical model of dynamic load analysis of shafts was established.By analyzing the mechanical structure of drive shafts for existing oil-film bearing testing device, the formula of dynamic load coefficients was deduced under the conditions of start-up and braking mutation of drive shafts.The numerical range of shaft dynamic load coefficients was determined according to the structural parameters of drive shafts, and some typical forms of dynamic load coefficients in actual engineering applications were given.The results show that, compared with those without hydrostatic oil pressure, the dynamic load coefficients of hydrostatic dynamic oil-film bearing with hydrostatic oil pressure are smaller before start-up and stop of shafts, and the influence of vibration on the stability of oil film is also smaller.