Method and apparatus for determining resonant frequency of a tur

Details Method and apparatus for determining resonant frequency of a tur Method and apparatus for determining resonant frequency of a tur

1989-04-07

1990-05-15

Williams, Hezron E.

Measuring and testing

Vibration

Resonance, frequency, or amplitude study

G01N 2900

Patent

active

049247069

ABSTRACT:
A method and apparatus for resonant frequency testing of free standing turbine blades made of a material, such as titanium, that is not responsive to a magnetic field is disclosed. A lightweight shim 12 made of a magnetically responsive material such as steel, weighing on the order of 0.5 grams, is attached to the convex side of the blade 10. The shim 12 is excited by an oscillating magnetic field and moves the blade 10 accordingly. The maximum amplitude of blade 10 movement is recorded and used to determine the resonant frequency as the excitation frequency of the magnetic field is swept through a frequency window range. The low weight of the shim 12 does not materially change the resonant frequencies of the blade 10.

REFERENCES:
patent: 2450939 (1948-10-01), Cor
patent: 3792348 (1974-02-01), Rollwitz
patent: 4002058 (1977-01-01), Wolfinger
patent: 4026142 (1977-05-01), Jacobs
patent: 4389891 (1983-06-01), Fournier
patent: 4482859 (1984-11-01), Fournier
patent: 4682608 (1987-07-01), De Rigal et al.

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