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.
Development of Low-Noise Cooling Fan Using Uneven Fan Blade Spacing
Sae Technical Papers
SAE World Congress & Exhibition ; 2008
2008-04-14
Aufsatz (Konferenz)
Englisch
Development of Low-Noise Cooling Fan Using Uneven Fan Blade Spacing
British Library Conference Proceedings | 2008
|Development of low-noise cooling fan using uneven fan blade spacing
Kraftfahrwesen | 2008
|2008-01-0569 Development of Low-Noise Cooling Fan Using Uneven Fan Blade Spacing
British Library Conference Proceedings | 2008
|