1997-05-19

Vibration Analysis of an Electric Motor Fan Assembly 971854

Analysis of an automotive engine cooling fan assembly was performed to identify the factors which cause vibration during operation and to quantify the relative contribution of these factors in the generation of forces that are transmitted through the vehicle. Both design and manufacturing aspects of the fan assembly and its components were considered.
Vibration forces generated during fan operation can be generally attributed to the level of unbalance in the motor fan assembly. This unbalance results from several factors which occur throughout the fan's manufacturing process.
An understanding of rotational unbalance and the factors contributing to the level of generated force is an important element in fan design. This understanding can be used to determine the most effective and economical solution to an existing vibration problem or to avoid such problems through cognizant design of future fan assemblies.

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