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A New Method for Calculating Fluctuation Strength in Electric Motors
Technical Paper
2001-01-1588
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
In assessing the sound quality of electric motors (e.g., seat, mirror, and adjustable pedal motors), the sensation of Fluctuation Strength - a measure of intensity or frequency variation - has become important. For electric motors, it is typically caused by variation in the load, creating frequency modulation in the sound. An existing method for calculating Fluctuation Strength proved useful initially, but more extensive testing identified unacceptable performance. There were unacceptable levels of both false positives and false negatives.
A new method is presented, which shows improved correlation with perceived fluctuation in sounds. Comparisons are made to the previous method and improvement is shown through examples of objective-subjective correlation for both seat motor sounds and adjustable pedal motor sounds. The new method is also shown to match subjective data from which the original measure of Fluctuation Strength was derived.
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Authors
Citation
Blommer, M. and Otto, N., "A New Method for Calculating Fluctuation Strength in Electric Motors," SAE Technical Paper 2001-01-1588, 2001, https://doi.org/10.4271/2001-01-1588.Also In
SAE 2001 Transactions Journal of Passenger Cars - Electronic and Electrical Systems
Number: V110-7; Published: 2002-09-15
Number: V110-7; Published: 2002-09-15
References
- Zwicker E. Fastl H. Psychoacoustics. Facts and Models Springer-Verlag Berlin 1990
- Blommer M. Wakefield G. Jones S. Otto N. Feng B. “Calculating the loudness of impulsive sounds,” Proc. of SAE Noise and Vibration Traverse City, MI May 1995