The research effort in the field has grown vigorously since Lueg proposed the idea of active noise control (ANC) in 1936. The ANC technique provides a useful alternative to the conventional passive means. The advantages of ANC techniques are improved low-frequency performance, reduction of size and weight, low back pressure and programmable flexibility of design. In viewing the ANC applications to date, much of the work has focused on the cancellation of the plane waves in ducts and small-volume enclosures such as headsets, in wich cases the use of single-chanell controller is sufficient to attenuate the noise within low-frequency range. On the other hand, multiple-channel ANC find applications in attenuating the noise in car and aircraft cabins. In comparison with ANC applications for ducts and headsets, the ANC systems for large enclosures remain less developed for full commercialisation. This is mainly due to the complexity of multiple-chanel ANC problem. Sound fields in large enclosures become 3-dimensional in nature and the high-order modes can no longer be neglected. In this paper, ANC techniqes for a car cabin are compared in terms of three control structures and two control algorithms. The multiple-input-multiple-output (MIMO) filtered-x least-mean-square (FXLMS) algorithm and the linear quadratic gaussian (LQG) algorithm are employed for controller synthesis. On the other hand, feedback, feedforward and hybrid (cascaded feedforward and feedback) configurations are employed as the major control structures. The ANC algorithms are implemented on the platform of a floating-point digital signal processor (DSP). To justify the developed systems, experiments are carried out for attenuation of the internal field in a plywood half model of a passenger car cabin. Engine exhaust noise is chosen as the primary noise in the experiments. Conclusions for these ANC methods con be drawn from the experimental results as follows. The ANC system using feedback structure is not so effective in dealing with the ANC problem of large enclosure, even though an internal model is incorporated into the controller. Both feedforward control and hybrid control yield significant noise attenuation. In particular, the hybrid ANC system appears to be a promising approach for practical application from the perspective of performance of attenuation and speed of convergence. One important issue that is not adressed in this paper is how to deal with the varying-speed ANC problem. Preliminary study shows that there remains convergence problem for the FXLMS algorithm to keep up with fast changing engine speed. Future investigation will focus on this particular aspect.


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    Titel :

    Development of a multiple channel active noise cancellation system for car cabins


    Weitere Titelangaben:

    Entwicklung eines aktiven Mehrkanal-Lärmunterdrückungsystems für Pkw-Fahrgasträume


    Beteiligte:
    Chen, H. (Autor:in) / Wu, J.D. (Autor:in) / Bai, M.R. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    2003


    Format / Umfang :

    18 Seiten, 8 Bilder, 1 Tabelle, 17 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch





    Development of a multiple channel active noise cancellation system for car cabins

    Chen,H. / Wu,J.D. / Bai,M.R. et al. | Kraftfahrwesen | 2003


    Global Active Noise Control in Aircraft Cabins

    Greßkowski, Julian / Böhme, Sten / Sachau, Delf | AIAA | 2009


    Global Active Noise Control in Aircraft Cabins

    Grebkowski, J. / Bohme, S. / Sachau, D. et al. | British Library Conference Proceedings | 2009