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Reduction of Cooling Fan Noise Caused by Crankshaft Torsional Vibration
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English
Abstract
Improvements of interior and exterior noise are important targets in vehicle engineering. There are many reports concerning the reduction of radiator cooling fan noise. But, most of those reports are associated with studies of air flow noise.
A radiator cooling fan connected to a crankshaft occasionally radiates structure-borne noise in addition to air flow noise. This structure-borne noise is caused by fan blade vibration excited by torsional vibration of a crankshaft.
In this paper, we surveyed the mechanism of the structure-borne noise and discussed some methods for the noise reduction. And, as a result, we developed one of the noise reduction technique aiming at isolation of crankshaft vibration by modifying viscosity of the oil in a fan clutch.
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Citation
Ohta, M., Nishida, T., Kobayashi, T., and Yamaki, M., "Reduction of Cooling Fan Noise Caused by Crankshaft Torsional Vibration," SAE Technical Paper 931334, 1993, https://doi.org/10.4271/931334.Also In
References
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- Ohki K. Rubber Type Torsional Damper for Engine Crankshaft Internal Combustion Engine 30 377 1991-3
- Akaike, S. Kuroki, S. Katagiri M. Noise Reduction of Radiator Cooling Fan for Automobile 1995-5 JSAE Convent ion Proceeding 901, 901090
- Omura, S. Ishikawa, N. Hamamoto, T. Sugiyama T. Developement of the Electronically Contorolled Hydraulic Cooling System 1990-5 JSAE Convention Proceeding 901, 901004