탄성 링을 갖는 볼 베어링 지지의 터보 펌프 임계 속도에 관한 연구

Critical Speeds Evaluation of Turbo Pump Unit with a Elasticring Inserted Ball Bearing

This study was performed to evaluate the dynamic behavior of turbo pump unit. The acceptable separate margin of $1^{st}$ critical speed was obtained by the use of elastic-ring inserted ball bearing, while the poor separate margin of $1^{\st}$ critical speed was appeared in the case without the elastic-ring. In addition, the results show that the stiffness and damping of plain seals give more separate margin of $2^{nd}$ critical speed. However the wear or the failure of seals could reduce the $2^{nd}$ critical speed near the operating speed.