Authors: K. Takeda
Addresses: Isuzu Motors Limited, Kawasaki-shi, Japan
Abstract: Noise reduction in heavy-duty vehicles is required urgently. To this end, four major manufacturers of heavy vehicles jointly implemented a project: |Development and Research of Low Noise Heavy Duty Trucks|, under the guidance of M.I.T.I., Isuzu Motors Limited have conducted research into the reduction of noise in cooling systems. In heavy-duty vehicles, cooling fan noise is one of the biggest contributors to overall vehicle noise, second only to that of the engine itself. Our experimental research described here, was carried out by classifying the subject into the following three areas: (a) research concerning the specification and layout of cooling elements affecting noise characteristics and air flow, (b) research into the heat dissipation rate of radiators, (c) research into developing an optimum low-noise cooling system by coordinating (a) and (b). From the test results it was determined that the best way to reduce cooling system noise more efficiently is to decrease the fan speed while improving the cooling performance by using a larger fan and radiator, a bell-mouthed fan-shroud and an alternating the system layout.
Keywords: vehicle design; cooling system design; noise reduction; heavy duty trucks; broad band noise; fan; fan-shroud and radiator system layout; cooling performance; noise measurement; noise analysis; air flow measurement; heat dissipation rate measurement.
International Journal of Vehicle Design, 1981 Vol.2 No.1, pp.29 - 43
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