Active noise control (ANC) and active sound design (ASD) are efficient techniques to reduce noise and optimize soundscapesbysuperposing sound waves from secondary sources. More and more of these techniques are used in passenger cars to minimize Noise Vibration Harshness (NVH) and to improve the passenger comfort. This paper presents results of an experimental study on ANC for a middle class passenger car with a four-cylinder in-line engine. Measurements, carried out at Fraunhofer LBF to characterize the acoustics in the passenger cabin, indicate that the secondengine order has the most important contribution to the engine induced interior noise and should therefore be compensated to improve ride comfort. Two different actuator concepts for ANC were investigated. The first concept uses a common car HIFI system for noise cancellation, while the second concept uses four additional electrodynamic inertial mass actuators mounted on acoustically sensitive points of the car body. Both concepts are presented and compared to each other. Furthermore, measurements with implemented actuators at the car body were carried out. The results are used to characterize the acoustic properties and to specify the mounting points for the actuators. Both concepts use a narrowband FxLMS algorithm, which enables the actuators to compensate several harmonic signals, i. e. engine orders, simultaneously. Moreover, the design of favored system acoustics becomes possible by using weighting matrices which depend on frequency, gear stage and actuator channel. The control algorithm, its implementation on a dSPACE real time unit and the integration into a test vehicle are presented. In the main part of this paper experimental results for different engine run-ups for both concepts are presented. Key aspects of this experimental study are theinfluence on the cabin noise, the effect on vibrations of comfort relevant positions and the demand of electric energy of the control actuators. Based on these results an evaluation of technical effort and achievable benefit is carried out. In a final step future topics in the field of vehicle ANC are highlighted.


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    Titel :

    Experimental study of two different actuator concepts for Active Noise Control in a middle class passenger car


    Beteiligte:
    Wolter, Stefan (Autor:in) / Millitzer, Jonathan (Autor:in) / Kraus, Roman (Autor:in) / Zech, Philipp (Autor:in) / Jackel, Marco (Autor:in) / Hansmann, Jan (Autor:in)


    Erscheinungsdatum :

    2014


    Format / Umfang :

    10 Seiten, Bilder, Tabellen, 13 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch






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