Airfoil vibration test apparatus

Details Airfoil vibration test apparatus Airfoil vibration test apparatus

1980-12-04

1982-09-21

Kreitman, Stephen A.

Measuring and testing

Vibration

Resonance, frequency, or amplitude study

73671, G01H 1300

Patent

active

043500439

ABSTRACT:
An apparatus for inducing high frequency out-of-phase, vibrations in adjacent span-wise panel portions of a plate type structure, such as an airfoil blade of a gas turbine engine. The apparatus includes a novel bifurcated duct for conducting and directing two out-of-phase streams of gaseous flow, and a uniquely structured air chopper which generates the two out-of-phase gaseous streams. The duct has an upstream end with which the output of the air chopper is in communication, and a stepped-down downstream end at which the airfoil blade (or other plate type structure specimen that is to be tested) is held, supported, and positioned in a chord-wise direction, such that the two out-of-phase gaseous streams impinge upon, and induce the same high frequency vibration in, two preselected, adjacent, span-wise panel portions of the specimen, thereby the panel portions vibrate out-of-phase.

REFERENCES:
patent: 2575710 (1951-11-01), Hardigg
patent: 2682167 (1954-06-01), Gamarekian
patent: 2756416 (1956-07-01), Griparis
patent: 3023610 (1962-03-01), Prochazka
patent: 3416628 (1968-12-01), Bschorr et al.
patent: 4012952 (1977-03-01), Dory
patent: 4019375 (1977-04-01), Ellis et al.
patent: 4043176 (1977-08-01), Graham

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