Damper element with spring-suspended bearing member for vibration dampening system for turbine blade

A vibration dampening system for a rotating blade, the vibration dampening system comprising:

• a plurality of damper elements for positioning in a stacked arrangement in a cylindrical body opening defined in the rotating blade, each damper element including:
• a base member having an axially fixed position within the cylindrical body opening;
• and
• a spring-suspended bearing member including a disc spring fixedly coupled to the base member at a center of the disc spring, and a bearing member coupled to a first side of the disc spring at an outer perimeter thereof, wherein the bearing member extends radially distal from the first side of the disc spring;
• wherein, with the disc spring in an elastically extended state under influence of a centrifugal force caused by rotation of the rotating blade at higher than a predefined rotational speed, the bearing member frictionally engages a first bearing surface to dampen vibration.

A vibration dampening system for a rotating blade in a turbine, the vibration dampening system comprising:

• a plurality of stacked damper elements for positioning in a cylindrical body opening defined in the rotating blade, each damper element including:
• a base member having an axially fixed position within the cylindrical body opening;
• and
• a spring-suspended bearing member including a disc spring fixedly coupled to the base member at a center of the disc spring, and a bearing member coupled to a first side of the disc spring at an outer perimeter thereof, wherein the bearing member extends radially distal from the first side of the disc spring;
• wherein the disc spring of a first damper element of the plurality of damper elements positions the bearing member of the first damper element:
• at a distance from a first bearing surface with the rotating blade rotating at lower than a predefined rotational speed and the disc spring in a not-fully extended state;
• and
• frictionally engaging the first bearing surface to dampen vibration with the disc spring of the first damper element in an elastically extended state under influence of a centrifugal force caused by rotation of the rotating blade at higher than the predefined rotational speed.