In order to design the sound quality in interior and exterior space of a car and improve the vibration comfort, the identification of excitation force generated from the engine is very important and inevitable. Since the direct identification of force under operating condition is difficult to conduct, the indirect identification based on FRF measurements, that is, the inverse FRF times the response result the force, becomes popular but requires the excitation at force generation points such as main bearings, which is very hard to install the exciter. As alternative way, by use of reciprocity, the FRF may be replaced by exciting the monitoring response point and detecting the response at force generation point. But it is still very time consuming to excite several points. Instead of that, the ordinal modal testing in which only a few easy access point are stationary excited while many responses can be measured within short time and a little effort, is expected to predict the FRF between the force generation point and the monitoring response point under operating condition. After curve fitting, the prediction is possible so called as synthesized FRF. However in high frequency range, the curve fitting only provides very limited number of mode and the synthesized FRF may be far from the correct one especially at frequency valleys that are very sensitive to be inverted in force identification process. In this paper a new approach is proposed in which the number of mode is successively expanded in the vicinity of high frequency range of interest and the differences of synthesized FRF during such expansion are taken into account to determine the appropriate monitoring response points. This approach is verified by a numerical FE and experimental model of T plate and finally an actual V6 automobile engine is tested to identify the excitation force.


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    Title :

    Identification of excitation force generated from automobile engine in high frequency range


    Additional title:

    Identifikation von Anregungskräften eines PKW-Motors im hochfrequenten Bereich


    Contributors:


    Publication date :

    2006


    Size :

    7 Seiten, 17 Bilder, 4 Quellen



    Type of media :

    Conference paper


    Type of material :

    Storage medium


    Language :

    English




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