Fan blade damper
AssigneeGeneral Electric Company
InventorsStephen J. Szpunar, Christopher C. Glynn
Life of this patent
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Abstract
A fan blade damper system includes a fan disk integrally connected to a disk post. A retainer is fastened to the disk post and is molded to retain a damper block. The top portion of the damper block is shaped to make frictional contact with the underside of the platform of a fan blade, the underside of the platform being the region of the fan blade which experiences the highest platform vibratory amplitude when the fan blade is rotated. The damper block is thus mounted in a statically determinant fashion. The rotation of the fan blade produces centrifugal forces which produce reactionary forces in the damper block and retainer such that a maximum damping force amplitude is reacted to the fan disk.
Claims15
A fan blade damper system comprising:
- damper means for frictionally engaging a highest vibratory region of a fan blade;
- and
- retainer means for retaining said damper means so that said damper means is mounted in a statically determinant fashion, said retainer means having at least three sides with two opposite sides for mounting to a fan disk post with said damper means being disposed directly radially above the fan disk post.
A fan blade damper system comprising:
- a damper block for frictionally engaging a highest vibratory region of a fan blade;
- and
- a retainer for retaining said damper block so that said damper block is mounted in a statically determinant fashion, said retainer having at least three sides with said damper block being disposed above a fan disk post and said retainer having an axial face to provide a tangential force to said damper block and a tangential face to provide an axial force to said damper block when the fan blade is rotating.
A fan blade damper system comprising:
- a fan disk having a plurality of circumferentially spaced disk posts, a slot being defined between each adjacent pair of disk posts;
- a plurality of retainers each having at least three sides with two opposite sides attached to a respective disk post, each of said retainers having an axial and a tangential face;
- a plurality of fan blades each having an airfoil portion, a root portion, and a platform portion interposed between said airfoil portion and said root portion, said root portion being adapted for being retainably engaged in said slot for supporting said blade in an operable position on said fan disk;
- a plurality of damper blocks each being captured by a respective one of said retainers between an underside of a respective one of said platform portions and a radially outer surface of a corresponding disk post, each of said damper blocks being positioned for contacting each of said platforms at a location corresponding to a region of maximum platform vibratory amplitude;
- and
- said axial face of each retainer providing a tangential force to said respective damper block when the fan disk is rotated.
Dependencies are inferred from the claim text.