Tribology and Lubricants

Korean Tribology Society (한국트라이볼로지학회)
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Dynamic Behavior Analysis of a Crankshaft-Bearing System in Variable Speed Reciprocating Compressor

가변속 왕복동형 압축기 크랭크축-베어링계의 동적 거동 해석

  • 김태종 (부산대학교 기계공학부 및 기계기술연구소)
  • Published : 2001.12.01
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Abstract

The hermetic reciprocating compressor driven by the BLDC motor rotating with variable speeds, is modelled and analyzed for dynamic characteristics. The governing equations of piston, connecting rod and crank-shaft of the reciprocating compression mechanism and characteristics of driving torque of the motor are obtained. Dynamic behavior of the crankshaft supported on 2 journal bearings is analyzed considering compression load and eccentric unbalance for the 4 rotating speeds of crankshaft. And. reaction forces generated from oil film in the journal bearings are analyzed under transient condition using Reynolds' equation. To take into account the dynamic characteristics depending on the variable rotating speeds, comparison on the dynamic behavior of crank-shaft is made for the 4 operating modes of the compressor. Results show that the magnitude of crankshaft locioperating on the lower rotating speeds is more larger than the higher ones due to reduction of inertia force of the reciprocating piston.

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References

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  2. 피스톤의 점성 마찰력을 고려한 소형 왕복동 압축기의 동적 해석 vol.12, pp.11, 2001, https://doi.org/10.5050/ksnvn.2002.12.11.904
  3. Numerical Analysis of the Piston Secondary Dynamics in Reciprocating Compressors vol.17, pp.3, 2001, https://doi.org/10.1007/bf02984361
  4. 스러스트 볼 베어링이 적용된 왕복동형 압축기의 마찰손실 해석 vol.27, pp.2, 2001, https://doi.org/10.9725/kstle.2011.27.2.101