Improving cooling system performance, thus, reducing the fan aerodynamic requirement is a key to quieter fans. Relative to an existing gasoline-engined medium truck cooling system, increased top tank temperature permits an airflow reduction estimated to allow an 11 dB reduction in fan noise. Use of a multi-pass radiator in this configuration adds a further 1.5 dB reduction, as estimated in a non-optimized case. Fan aerodynamic and acoustical performance is most significantly improved by reducing blade tip-to-shroud clearance. Fan designs which include integral (rotating) shrouds provide the best aerodynamic performance and least noise. Alternatively, low tip clearance fans using fixed engine-mounted shrouds or radiator-mounted fans (driven by a flexible coupling), will also provide superior performance. Aerodynamic test data provided by manufacturers tends to use tip clearances much smaller than obtainable in practice. Standard test procedures are also unavailable for acoustical testing of engine cooling fans. Consequently current production fan noise performance is almost completely undocumented. Aerodynamic and acoustical fan test procedures for vehicle applications which reasonably represent installed fans should be developed and performance data on commercially available fans be catalogued to permit rational fan selection and encourage fan development. (Stoehr)


    Access

    Access via TIB

    Check availability in my library


    Export, share and cite



    Title :

    Effect of cooling system design on truck noise


    Additional title:

    Einfluss der Ventilatoren im Kuehlsystem auf die Laermentwicklung von Lastwagen


    Contributors:
    Staiano, M.A. (author) / Major, R.A. (author)

    Published in:

    Publication date :

    1981


    Size :

    103 Seiten


    Type of media :

    Report


    Type of material :

    Print


    Language :

    English




    Optimising truck enclosures for noise and cooling

    Liebregts,R. / DAF Trucks,NL | Automotive engineering | 1999


    Optimising truck enclosures for noise and cooling

    Liebregts, R. | Tema Archive | 1999


    TRUCK COOLING SYSTEM AIRFLOW

    KLINGE, EARL R. | SAE Technical Papers | 1958


    TRUCK COOLING SYSTEM REQUIREMENTS

    PERSON, F.W. | SAE Technical Papers | 1958


    Reducing exhaust system noise in heavy truck design

    Inagawa,M. / Nakamura,K. / Mitsubishi Motors,JP | Automotive engineering | 1981