Comparison on the sound power levels and performance of cooling fans

Johannes Hyrynen, Kari P. Saarinen, Kimmo Heinonen

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

    Abstract

    Ranking of noise generation mechanisms is essential for designing low noise diesel engines. Engine noise is caused by several excitations or sources of noise, such as combustion, turbo charger, piston slap, valve mechanism, fuel pumps, gears and inertia forces. A test setup for determining valve mechanism generated noise consisted of a medium speed diesel engine including the engine block, cam and crank covers, cylinder heads and valve mechanism. The camshaft was driven with an electric motor. Sound power level measurements were carried out in order to find out the contribution of the valve mechanism generated noise. Strain gauge and acceleration measurements were made to determine valve impact forces. The effect of valve clearances was studied. Reference measurements were carried out using a normally operating engine. The sound power generated by the valve mechanism can be studied using FEM and BEM modeling. The excitations can be modeled using a multibody model of the valve mechanism. Also measured valve and push rod forces may be used to estimate the excitation forces. The measured sound power of the valve mechanism turned out to be less than 10 % of the total sound power of the engine.
    Original languageEnglish
    Title of host publicationProceedings of Internoise 2008
    Place of PublicationShanghai
    Publication statusPublished - 2008
    MoE publication typeB3 Non-refereed article in conference proceedings
    Event37th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2008 - Shanghai, China
    Duration: 26 Oct 200829 Oct 2008

    Conference

    Conference37th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2008
    Abbreviated titleINTER-NOISE
    CountryChina
    CityShanghai
    Period26/10/0829/10/08

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