Method and damping device for vibration damping of a blade of a turbomachine as well as turbomachine
AssigneeMTU Aero Engines AG
InventorUlrich Retze
Life of this patent
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Abstract
A method for vibration damping of at least one blade of a turbomachine, wherein initially at least one damping element is arranged on the blade such that it can move in the axial direction, employs a damping element having a larger permeability constant than the blade (μrD>μrB), and then a magnetic field acting in the radial direction is generated at least temporarily during rotation of a rotor hub of the turbomachine in order to adjust the mass of the damping element in real time. A damping device includes, for example, a ferromagnetic damping element as well as a magnetic field source, and a turbomachine.
Claims11
A method for vibration damping of at least one blade (1) of a turbomachine, the turbomachine having an axial direction and a radial direction, the method comprising the steps:
- providing at least one blade, each blade having a respective blade cavity defined in the respective blade, the cavity comprising a first cavity face;
- providing at least one damping element (18);
- placing the at least one damping element (18) in the cavity of one of the at least one blades (1) such that it can move in the axial direction, said damping element having a larger permeability constant (μrD) than the blade (1), said damping element comprising a first surface;
- and
- generating a magnetic field (26) acting in the radial direction at least temporarily during rotation of a rotor hub of a turbomachine to move the at least one damping element in the radial direction within the cavity, thereby creating an adjustable contact force between the first cavity face and the first surface.
A damping device (2) for vibration damping of at least one blade (1) with a smaller permeability constant (μrB) of a turbomachine having an axial direction and a radial direction, the damping device comprising at least one damping element (18) with a larger permeability constant (μrD) for placement in a cavity defined within one of the at least one blades (1) such that it can move in the axial direction and comprising at least one magnetic field source (20) for production of a contact force acting in the radial direction on the damping element (18) at an interface between a first cavity face and a first surface of the damping element.
Dependencies are inferred from the claim text.