Vibration damper device for turbomachine blade attachments, associated turbomachine and associated engines

摘要

A vibration-damping device for a turbomachine blade including a blade root configured to be inserted into a pocket of a carrier disk of a bladed wheel, the device configured to be positioned between the blade root and a retaining wall of the pocket. The device includes at least one shim including an assembly of layers of rigid materials and of viscoelastic materials, and including two portions, each forming a lateral branch which can be inserted along one of the two retaining walls, the two lateral branches being connected to one another, so as to constitute a single part, by a third portion forming a shim bottom of rigid material. At least one layer of viscoelastic material is positioned between two layers of rigid materials.

主权项

1. A vibration damping device for a turbomachine blade including an airfoil and with a blade root configured to be inserted in a cavity in a disk supporting a bladed rotor, the device being configured to be positioned between the blade root and a wall of the root retaining cavity, at a region of contact that occurs in operation between the blade root and the cavity, the device comprising:
at least one shim including an assembly of layers of rigid materials and of viscoelastic materials, at least one layer of viscoelastic material being positioned between two layers of rigid materials, the shim comprising two parts, each part forming a lateral branch that can be inserted along one of two retaining walls, the two lateral branches being joined together, to form a single component, by a third part of rigid material that forms the shim bottom, wherein the shim bottom is positioned, relative to the lateral branches, such that after fitting the shim bottom abuts an upstream or downstream end of the blade root, and wherein the shim is obtained from a flat component of three consecutive segments separated from one another by fold lines, the segment that forms the shim bottom being positioned between the two segments that form the lateral branches so as to present a substantially U-shape when viewed from above in which the lateral branches extend along a first direction, the shim bottom extends along a second direction substantially perpendicular to the first direction, and a length of the lateral branches in the first direction is greater than a length of the shim bottom in the second direction.