Altering vibration frequencies of workpieces, such as gas turbin

Details Altering vibration frequencies of workpieces, such as gas turbin Altering vibration frequencies of workpieces, such as gas turbin

1997-09-09

1999-11-23

Verdier, Christopher

Fluid reaction surfaces (i.e., impellers)

Specific blade structure

Coating, specific composition or characteristic

416223A, 416500, 416140, 21912162, 21912178, 21912179, 2191218, 21912182, B64C 1120, B23K 2600

Patent

active

059889829

ABSTRACT:
A method of modifying the vibration resonance characteristics of a workpiece includes the steps of determining a vibratory resonance condition frequency of the workpiece, determining the mode shape of said vibratory resonance condition, locating an area on the workpiece that includes a maximum curvature for the determined mode shape and vibratory resonance condition frequency; then laser shock peening the located area to create residual compressive stresses within the workpiece to shift the determined vibratory resonance condition frequency. A workpiece such as a gas turbine engine blade is also disclosed.

REFERENCES:
patent: 4118147 (1978-10-01), Ellis
patent: 4426867 (1984-01-01), Neal et al.
patent: 4878810 (1989-11-01), Evans
patent: 5131957 (1992-07-01), Epstein et al.
patent: 5591009 (1997-01-01), Mannava et al.
patent: 5620307 (1997-04-01), Mannava et al.

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