Thermal-acoustic section (436) for an aircraft (10) for reducing noise along an acoustic path (22) produced from an acoustic source (16) is provided herein. The thermal-acoustic section (436) comprises a plurality of juxtaposed porous layers (400) forming a thermal-acoustic stack (447) that has a first outermost portion (474), a second outermost portion (476) and a central portion (478). The thermal-acoustic stack has a gradually deecreasing characteristic acoustic impedance from the first outermost portion to the central portion and a gradually increasing characteristic acoustic impedance from the central portion to the second outermost portion, to promote transmission loss of the transmitted portion of the noise through the thermal-acoustic stack.


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    Title :

    IMPROVED THERMAL-ACOUSTIC SECTIONS FOR AN AIRCRAFT


    Additional title:

    VERBESSERTE THERMOAKUSTISCHE ABSCHNITTE FÜR EIN FLUGZEUG
    SECTIONS THERMOACOUSTIQUES AMÉLIORÉES POUR AÉRONEF


    Contributors:

    Publication date :

    2018-06-13


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    B64C AEROPLANES , Flugzeuge / B32B LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM , Schichtkörper, d.h. aus Ebenen oder gewölbten Schichten, z.B. mit zell- oder wabenförmiger Form, aufgebaute Erzeugnisse / G10K Tonerzeugungsvorrichtungen , SOUND-PRODUCING DEVICES



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