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Development of Low-Noise Cooling Fan Using Uneven Fan Blade Spacing
Technical Paper
2008-01-0569
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
When unifying the functions of widely used two-fan, engine cooling system into a single fan unit, the noise and power issues must be addressed. The noise problem due to the increased fan radius is a serious matter especially as the cabin noise becomes quieter for sedans. Of the fan noise components, discrete noise at BPF's (Blade Passing Frequency) seriously degrades cabin sound quality. Unevenly spaced fan is developed to reduce the tones. The fan blades are spaced such that the center of mass is placed exactly on the fan axis to minimize fan vibration. The resulting fan noise is 11 dBA quieter in discrete noise level than the even bladed fan system.
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Citation
Lee, J. and Nam, K., "Development of Low-Noise Cooling Fan Using Uneven Fan Blade Spacing," SAE Technical Paper 2008-01-0569, 2008, https://doi.org/10.4271/2008-01-0569.Also In
References
- Lee J. Cho K. Lee S. 2000 Application of Acoustic Analogy to Automotive Engine-Cooling Fan Noise Prediction,” AIAA Journal 38 1095 1098
- Akaike S. Kikuyama K. Kitada M. Kuwayama K. 1996 Study of Rotational Noise Reduction for Axial Flow Fan JSME International 39 3