Uncontrollable Modes in Double Wall Panels

Oliver E. Kaiser, A. Agung Julius, Stanislaw J. Pietrzko, Manfred Morari

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    Double-glazed windows have a poor transmission loss at low frequency. Since the passive means are more or less exhausted one could think of using an active controller to increase the transmission loss. In the work presented here two speakers in the cavity between the panes are used as actuators. A modal model is derived and validated with data from a laser scanner and measured transfer functions on the structure. From an analysis of this model it is shown that for certain configurations of the double wall panel some modes of the coupled system are uncontrollable and unobservable by speakers and microphones in the cavity, thus limiting the achievable controller performance. This theoretical result is verified by feedforward control experiments on two types of double-glazed windows. For the fully controllable window the transmission loss achieved by the active controller is about twice as large as for the window with uncontrollable modes.
    Original languageEnglish
    Title of host publicationProceedings of the 17th International Congress on Acoustics
    Subtitle of host publicationRome, September 2-7, 2001
    EditorsAdriano Alippi
    Place of PublicationBelluno
    PublisherInternational Commission for Acoustics
    Number of pages2
    ISBN (Print)9788888387079
    Publication statusPublished - 2001
    Event17th International Congress of Acoustics, ICA 2001 - Rome, Italy
    Duration: 2 Sep 20017 Sep 2001
    Conference number: 17


    Conference17th International Congress of Acoustics, ICA 2001
    Abbreviated titleICA

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