In a number of applications, particularly in the aerospace field, it is desirable to have panels which are light and strong, but which also have a high sound transmission loss over a broad range of frequencies. For a given weight and strength the passive transmission loss of a conventional panel is subject to fundamental physical limitations and active methods of improving the transmission loss have been sought. A long-term goal in active control has been to integrate sensors, actuators and controllers into the structure of the panel to improve its transmission loss and so create a ''smart panel''. An increasing understanding of the physical mechanisms of active control with realistic actuators and sensors, and the control strategies which are most appropriate, together with the falling cost of signal processing devices and MEMS transducers suggests that such a goal is coming closer. This paper will review some of the actuators and sensors which are currently being investigated in this application, with particular emphasis on their use in feedback controllers. For a given array of 4 x 4 piezoelectric actuators and velocity sensors, the integrated sound transmission ratio, over the bandwidth considered here, can be reduced somewhat more effectively by locally connecting each of the actuators and sensors, rather than connecting them with a single, SISO, feedback control loop.


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    Title :

    Active control of sound transmission


    Additional title:

    Aktive Regelung der Schallübertragung


    Contributors:


    Publication date :

    2001


    Size :

    10 Seiten, 10 Bilder, 2 Tabellen, 11 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English