The Ultra-Centrifuge Rotordynamics

초고속 원심분리기의 회전체동역학 설계

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정격속도 80,000 rpm 초고속 원심분리기(ultra-centrifuge)의 회전체동역학 설계가 수행된다. 설계목표는 충분한 위험속도(critical speed)의 분리여유(separation margin)와 함께, 다수의 고차 위험속도 통과시 원심분리기 로터의 위치에서 양호한 불균형응답특성을 갖는 로터-베어링 시스템의 최적구성을 이루어 내는 것이다. 후자의 특성은 불균형에 의해 가진될 때 로터의 질량중심이 회전축에 가능한 한 근접하도록 함으로써 만족시킬 수 있으며, 이를 위해 초유연축(extra slender shaft)이 적용된다. 이와 더불어, 특히 1차 위험속도에서 공진에 기인한 로터의 큰 변위를 방지하기 위해 범퍼링(bumper ring) 또는 안내베어링(guide bearing)의 설치가 필요하다. 유한요소법(finite element method)에 의한 회전체동역학 모델링이 수행되며, 지지 구름베어링의 강성과 함께 소량의 감쇠(damping)가 고려된다.