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http://dx.doi.org/10.5050/KSNVN.2008.18.8.879

A Rotordynamic Analysis of a Industrial Centrifuge for Vibration Reduction  

Kim, Byung-Ok (한국기계연구원 시스템에지니어링연구본부 회전기계연구팀)
Lee, An-Sung (한국기계연구원 시스템에지니어링연구본부 회전기계연구팀)
Publication Information
Transactions of the Korean Society for Noise and Vibration Engineering / v.18, no.8, 2008 , pp. 879-885 More about this Journal
Abstract
A rotordynamic analysis was performed with a decant-type centrifuge, which is a kind of industrial centrifuge. The system is composed of screw rotor, bowl rotor, driving motors, gear box, and support rolling element bearings. These rotors have a rated speed of 4300 rpm, and were modeled utilizing a rotordynamic FE method for analysis, which was verified through 3-D FE analysis. Design goals are to achieve wide separation margins of lateral critical speeds, and favorable unbalance responses of the rotor in the operating range. Then, a complex analysis rotordynamic analysis of the system was carried out to evaluate its forward synchronous critical speeds and mode shapes, whirl natural frequencies, and unbalance responses under various balance grade. As a result of analysis, the rotordynamic analysis performed by separating a screw rotor and bowl rotor may cause an error in predicting critical speed of entire system. Therefore, the rotordynamic analysis of a coupled rotor combining a screw and bowl rotor must be performed in order to more accurately estimate dynamic characteristics of the decanter-type centrifuge as presented in this paper. Also, rolling element bearings with suitable stiffness should be selected to keep enough separation margin. In addition, in establishing balance grade of a screw and bowl rotor, ISO G2.5 balance grade is more recommended than ISO G6.3, in particular balancing correction of a screw rotor based on ISO G2.5 grade is strongly recommended.
Keywords
Centrifuge; Rotordynamics; Critical Speed; Campbell Diagram; Whirl Natural Frequency;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
연도 인용수 순위
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