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Method and apparatus for detecting and locating noise sources whether correlated or not

  • US 6,999,881 B2
  • Filed: 12/17/2003
  • Issued: 02/14/2006
  • Est. Priority Date: 12/17/2003
  • Status: Active Grant
First Claim
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1. A method of detecting and locating noise sources each emitting a respective signal Sj with j=1 to M, detection being provided by means of acoustic wave or vibration sensors each delivering a respective time-varying electrical signal si with i lying in the range 1 to N, the method comprising:

  • taking the time-varying electrical signals delivered by the sensors, each signal si(t) delivered by a sensor being the sum of the signals Sj emitted by the noise sources;

    amplifying and filtering the time-varying electrical signals as taken;

    digitizing the electrical signals;

    calculating the functional f, such that;

    f

    (nl,



    ,nj,



    ,nM
    )
    =det

    (<

    Tk

    (ω

    )
    ,Tl*

    (ω

    )
    >

    k
    ,l=0



    to



    M
    )
    det

    (<

    Tk

    (ω

    )
    ,Tl*

    (ω

    )
    >

    k
    ,l=1



    to



    M
    )


    with (Tk

    (ω

    )
    )
    i
    =

    J



    ω



    <

    nk
    ,ci>

    c
    <

    .,.>

    being the scalar product;

    ci being the vector constructed between the center of gravity of the sensors and the position of sensor i;

    nj being the unit vector in the direction defined by the center of gravity of the senors and source j;

    with T0=s; and

    with c=the speed of sound; and

    in minimizing the functional f relative to the vectors nj for j=1 to M in such a manner as to determine the directions nj of the noise sources, wherein ω

    is angular frequency,<

    Tk

    ), Ti*(ω

    )>

    is the scalar product between Tk

    ), and Tl*(ω

    ),J corresponds to the imaginary number in mathematics.

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