• Title/Summary/Keyword: 회전체 동역학

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A Study on the Turbopump Rotordynamic Characteristics due to Bearing Housing Structural Flexibility (베어링 하우징의 구조 유연성에 따른 터보펌프 회전체동역학 특성 연구)

  • Jeon, Seong Min;Yoon, Suk-Hwan;Kim, Jinhan
    • Journal of the Korean Society of Propulsion Engineers
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    • v.18 no.2
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    • pp.35-41
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    • 2014
  • A rotordynamic analysis is performed for a turbopump of 7 ton class liquid rocket engine considering bearing housing structural flexibility. Stiffness and damping characteristics of ball bearings and pump noncontact seals are reflected in a rotordynamic model. A dynamic model of bearing housing with lumped mass and stiffness is also applied to the rotordynamic analysis. Rotor critical speed and onset speed of instability are predicted from synchronous rotor mass unbalance response and complex eigenvalue analyses. The bearing housing structural flexibility effect on rotordynamic characteristics is investigated for both of bearing loaded and unloaded conditions respectively. From the numerical analysis, it is found that the effect of the housing structural flexibility significantly reduces the rotor critical speed and onset speed of instability.