COMBROS R

Simulation of the radial plain bearing operating behavior

The COMBROS R program enables isothermal and non-isothermal calculation of the static and dynamic bearing characteristics of hydrodynamically lubricated plain bearings.

  • Precise recording of the bearing geometry (profiling, oil feed pockets and grooves, lateral sealing webs including dirt grooves, hydrodynamically effective pockets)
  • Consideration of deviations in the lubrication gap geometry using a 2D lubrication gap function
  • Simultaneous (iterative) calculation of the pressure, temperature, viscosity and density distribution in the lubrication gap as well as the temperature distribution in the bearing components with approximate consideration of the most important ambient conditions
  • Determination of the lubrication gap flow in diverging gap areas using a simplified cavitation model (JFO model)
  • 2D calculation of the pressure distribution in the entire lubrication gap, solution of the extended Reynolds equation
  • 3D calculation of the temperature and viscosity distribution in the lubrication gap, solution of the energy equation
  • Consideration of the temperature dependence of the oil viscosity
  • 3D/2D calculation of the temperature distribution in the bearing components, solution of the heat conduction equations
  • Consideration of the heat transfer between the lubricant film and shaft/bearing shell and between the shaft/bearing shell and the environment
  • Lubricating film turbulence (change in the effective viscosity and heat conduction of the oil) through local description of the flow form and the transition from laminar to turbulent flow
  • approximate effective bearing clearance change due to thermal and elastic deformations
  • Exact recording of the change in gap geometry due to thermal and elastic deformations by coupling the bearing calculation with FEM calculation programs

Furthermore, the COMBROS R program allows an almost exact adaptation of the simulation to the real system according to the knowledge of the operating engineer through a large number of free parameters for setting the calculation boundary conditions.