0
Research Papers

# Vibration Suppression of Rotating Machinery Utilizing an Automatic Ball Balancer and Discontinuous Spring Characteristics

[+] Author and Article Information
Jun Liu

Department of Mechanical Science and Engineering, School of Engineering, Nagoya University, Nagoya, Aichi, 464-8603, Japanliu@nuem.nagoya-u.ac.jp

Yukio Ishida

Department of Mechanical Science and Engineering, School of Engineering, Nagoya University, Nagoya, Aichi, 464-8603, Japanishida@nuem.nagoya-u.ac.jp

J. Vib. Acoust 131(4), 041004 (Jun 05, 2009) (7 pages) doi:10.1115/1.3142872 History: Received June 09, 2007; Revised October 31, 2008; Published June 05, 2009

## Abstract

Automatic ball balancer is a balancing device where two balls inside a hollow rotor move to optimal rest positions automatically to eliminate unbalance. As a result, vibrations are suppressed to the zero amplitude in the rotational speed range higher than the major critical speed. However, it has the following defects. The amplitude of vibration increases in the rotational speed range lower than the major critical speed. In addition, almost periodic motions with large amplitude occur in the vicinity of the major critical speed due to the rolling of balls inside the rotor. Because of these defects, an automatic ball balancer has not been used widely. This paper proposes the vibration suppression method utilizing the discontinuous spring characteristics together with an automatic ball balancer to overcome these defects and to suppress vibration. The validity of the proposed method is confirmed theoretically, numerically, and experimentally. The results show that amplitude of vibration can be suppressed to a small amplitude in the vicinity of the major critical speed and the zero amplitude in the range higher than the major critical speed.

<>

## Figures

Figure 1

Theoretical model

Figure 2

Spring characteristic with the additional spring in the x-direction

Figure 3

The result of the numerical simulation (with only an automatic ball balancer)

Figure 4

Positions of balls in the stationary solutions

Figure 5

The results of the theoretical analysis and the numerical simulation (with only an automatic ball balancer)

Figure 6

With an automatic ball balancer and the additional springs (without a directional difference in stiffness): (a) resonance curves and (b) time history in the x-direction at ω=1.11

Figure 7

With an automatic ball balancer and the additional springs (with a directional difference in stiffness)

Figure 8

Experimental setup

Figure 9

The photographs of experimental setup

Figure 10

Resonance curve in the original system (experimental result)

Figure 11

With only an automatic ball balancer (experimental result)

Figure 12

Position of balls in the range higher than the major rotational speed (experimental result)

Figure 13

With an automatic ball balancer and the additional springs (experimental result): (a) resonance curve and (b) time history at ω=705 rpm

## Discussions

Some tools below are only available to our subscribers or users with an online account.

### Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related Proceedings Articles
Related eBook Content
Topic Collections