As part of an investigation to develop measurement techniques for structureborne noise, three modal surveys have been conducted on an OV-10A aircraft and the results have been presented. The purpose of the modal surveys was to identify suitable locations for mounting accelerometer and strain gages in subsequent tests in which transfer functions relating wing vibration to interior noise were to be determined. These surveys are as follows:(1) wing/fuselage modal survey utilizing one shaker under the right wing; (2) complete wing modal survey utilizing two shakers, one under each wing; and (3) fuselage side panel modal survey utilizing a small instrumented hammer. The predominant frequencies and damping ratios for each analysis were listed in tables. The primary mode shapes at the lower frequencies and at frequencies near the expected engine driving frequencies have been shown for each survey.


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    Title :

    Structureborne Noise in Aircraft: Modal Tests


    Contributors:

    Publication date :

    1986


    Size :

    36 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




    Structureborne noise in aircraft: Modal tests

    Clevenson, S. A. / Metcalf, V. L. | NTRS | 1986


    Structureborne noise in aircraft

    Clevenson, S.A. / Metcalf, V.L. | Tema Archive | 1987


    Structureborne noise in aircraft

    Clevenson, S. A. / Metcalf, V. L. | NTRS | 1987