Methods for Resolving Fan/Motor Vibration Problems in Air-Conditioning Units: Part I-Experimental Procedures for Identifying Vibration Modes Excited by Fan Impeller Imbalance

Document Type

Article

Publication Date

1998

Publication Title

ASHRAE Transactions

Volume

104

Issue

1A

Abstract

Analytical models have been developed that can be used to investigate the vibration modes that exist in small air-conditioning units and to obtain a clearer understanding of the influence of gyroscopic effects on these vibration modes. Techniques have been developed that can be used to determine the values of the mass and stiffness coefficients in the analytical models from measured data. The analytical model that incorporated the effects of the gyroscopic moment associated with the fan impeller indicated the gyroscopic moment resulted in forward and backward fan impeller whirling modes. These modes were associated with each of the rocking and swaying vibration modes that existed in the two air-conditioning units examined during this project. The correlation between the measured and calculated system resonance frequencies associated with specific vibration modes was very good.

Keywords

Air conditioning; Impellers; Vibration

Disciplines

Applied Mechanics | Computational Engineering | Computer-Aided Engineering and Design | Mechanical Engineering

Language

English

Permissions

Use Find in Your Library, contact the author, or use interlibrary loan to garner a copy of the article. Publisher copyright policy allows author to archive post-print (author’s final manuscript). When post-print is available or publisher policy changes, the article will be deposited


Search your library

Share

COinS