Modelling Hermetic Compressors Using Different Constraint Equations to Accommodate Multibody Dynamics and Hydrodynamic Lubrication

Edgar Alberto Estupinan, Ilmar Santos

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

In this work, the steps involved for the modelling of a reciprocating linear compressor are described in detail. The dynamics of the mechanical components are described with the help of multibody dynamics (rigid components) and finite elements method (flexible components). Some of the mechanical elements are supported by fluid film bearings, where the hydrodynamic interaction forces are described by the Reynolds equation. The system of nonlinear equations is numerically solved for three different restrictive conditions of the motion of the crank, where the third case takes into account lateral and tilting oscillations of the extremity of the crankshaft. The numerical results of the behaviour of the journal bearings for each case are presented giving some insights into design parameters such as, maximum oil film pressure, minimum oil film thickness, maximum vibration levels and dynamic reaction forces among machine components, looking for the optimization and application of active lubrication towards vibration reduction.
Original languageEnglish
JournalJournal of the Brazilian Society of Mechanical Sciences and Engineering
Volume31
Issue number1
Pages (from-to)35-46
ISSN1678-5878
Publication statusPublished - 2009

Keywords

  • hydrodynamic lubrication
  • multibody dynamics
  • hermetic compressor
  • Reynolds equation
  • journal bearing

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