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Acoustic inspection of one-piece bladed wheels

  • US 20020059831A1
  • Filed: 10/09/2001
  • Published: 05/23/2002
  • Est. Priority Date: 10/10/2000
  • Status: Active Grant
First Claim
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1. / A method of acoustically inspecting a one-piece bladed wheel, the method comprising the following steps:

  • a) driving the wheel in rotation;

    b) subjecting a first blade to mechanical excitation;

    c) picking up an acoustic response and generating a corresponding electrical signal;

    d) performing an FFT computation to determine the frequency response of said first blade of the wheel;

    e) storing the electrical signal and the associated frequency response;

    f) repeating steps b) to e) for each blade of the wheel;

    g) identifying characteristic frequencies of each blade of the wheel from the stored frequency responses; and

    h) rejecting or accepting a wheel depending on whether the resulting frequency distribution matches a predetermined set of forbidden frequency distributions.

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