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Wavenumber-adaptive control of sound radiation from structures using a `virtual` microphone array method

  • US 5,519,637 A
  • Filed: 08/20/1993
  • Issued: 05/21/1996
  • Est. Priority Date: 08/20/1993
  • Status: Expired due to Fees
First Claim
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1. A method for reducing acoustic radiation from a structure and acoustic noise transmission through the structure, the structure having generally opposed first and second exterior surfaces and an interior portion bounded by the two surfaces, the structure vibrating in a multiplicity of flexural modes of vibration, comprising the steps of:

  • measuring a vibration field on the vibrating structure;

    computing, using the vibration field measurements, a far-field acoustic radiation pressure field in an ambient medium, generated by the vibrating structure;

    providing a spatial representation of the computed far-field acoustic radiation pressure field, for flexural wavenumbers smaller than a predetermined value, as error signals for implementing a plurality of adaptive least mean squares algorithms generating a plurality of control signals;

    using the control signals to generate a plurality of forces that when applied to the vibrating structure suppress flexural modes of vibration characterized by wavenumbers smaller than the predetermined value; and

    applying the forces to the vibrating structure.

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