Frequency tuned hybrid blade

Details Frequency tuned hybrid blade Frequency tuned hybrid blade

1999-04-16

2000-03-07

Ryznic, John E.

Fluid reaction surfaces (i.e., impellers)

Specific blade structure

Hollow

416237, 416241A, B63H 126, B64C 1124

Patent

active

060331860

ABSTRACT:
A fan blade includes a metal airfoil having first and second opposite sides extending radially between a root and tip, and axially between a leading edge and a trailing edge. The airfoil further includes a plurality of pockets disposed in the first side and separated by corresponding ribs. A filler is bonded in the pocket, and is coextensive with the airfoil first side. Radial and diagonal ribs respectively intersect solely each other for selectively increasing torsional and bending stiffness to increase frequency margin between adjacent torsional and bending resonant modes of vibration.

REFERENCES:
patent: 5295789 (1994-03-01), Daguet
patent: 5407326 (1995-04-01), Lardellier
patent: 5634771 (1997-06-01), Howard et al.
patent: 5655883 (1997-08-01), Schilling
patent: 5839882 (1998-11-01), Finn et al.
patent: 5931641 (1999-08-01), Finn et al.

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