Combining multibody dynamics, finite elements method and fluid film lubrication to describe hermetic compressor dynamics

  • Authors:

  • Ilmar Santos;Edgar Estupinan

  • Affiliations:

  • Technical University of Denmark, Department of Mechanical Engineering, Kgs. Lyngby, Denmark;Technical University of Denmark, Department of Mechanical Engineering, Kgs. Lyngby, Denmark

  • Venue:
  • ICOSSSE'07 Proceedings of the 6th WSEAS international conference on System science and simulation in engineering
  • Year:
  • 2007

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Abstract

This work describes in details the steps involved within the mathematical modelling of reciprocating linear compressors. The dynamics of the mechanical components are described with help of Dynamics of Multibody Systems (rigid components) and Finite Element Method (flexible components). Some of the mechanical elements are supported by fluid film bearings where the hydrodynamics interaction forces are described by Reynolds equation. Two approaches are investigated, i.e. short and infinite long bearings. The system of nonlinear equations are numerically solved, taking into account the lateral and tilting vibration of the centre of the crank. The behaviour of the orbits in the journal bearings is presented giving some insights into design parameters, as maximal oil film pressure, minimum oil film thickness and maximum vibration levels.