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Shock and Vibration
Volume 2016, Article ID 7957821, 13 pages
http://dx.doi.org/10.1155/2016/7957821
Research Article

Dynamic Analysis and Design of a Balancer for a Three-Column Centrifuge

1School of Mechanical Engineering, Jiangnan University, No. 1800 Lihu Avenue,Wuxi, Jiangsu 214122, China
2Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology, Wuxi, Jiangsu 214122, China

Received 26 May 2015; Accepted 27 August 2015

Academic Editor: Francesco Ripamonti

Copyright © 2016 Hai-Wei Chen and Qiu-Ju Zhang. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This paper studies dynamics of a three-column centrifuge and tries to design a ball balancer to suppress its vibration and increase its operating speed. At first, two vibration models with and without the balancer are introduced. Then modal analysis of the centrifuge itself is carried out with two isolated natural frequency groups identified. Centrifugal forces acting on the system at the steady state are analyzed and a tip-over phenomenon is discovered and validated through simulations. A ball balancer is adopted in the centrifuge and several potential tip-over phenomena related to the balancer are studied. At last, a comparison between dynamics of the centrifuge before and after the balancer is installed is made with benefits and side effects of the balancer presented.