Bearing Rubbing of Reciprocating Compressor Based on Modified Conformal Contact Force Model
The conventional Hertz contact model has a large calculation error in analyzing the bearing rubbing trouble of reciprocating compressor.Based on the conformal contact characteristic of sliding bearing rubbing trou-ble,a modified conformal contact force model suitable for bearing rubbing trouble was proposed.The model was obtained by introducing a modified stiffness coefficient Kc and a modified stiffness index nc on the basis of the L-N contact force model.Then,using the Lagrangian second dynamic equation,a dynamic equation containing the bearing clearance at the big end of the reciprocating compressor was established.The RecurDyn software was used to simulate and verify the correctness of the modified conformal contact force model.Finally,the influence of differ-ent bearing clearances on crosshead acceleration and bearing contact force was analyzed,and the axis trajectory un-der the maximum bearing rubbing clearance was investigated.The study results show that compared with the L-N contact force model,the modified conformal contact force model is more suitable for load contact of close clearance,and can reduce an error about 82%at the most.The proposed modified conformal contact force model is more suit-able for describing the rubbing trouble of bearing clearance of reciprocating compressor.
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