Flexible-Spoke Squeeze Film Damper for Compact Rotor Stability
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Solution Overview
Problem
Existing squeeze film dampers in gas turbine engines are space-consuming and have insufficient functionality, failing to adequately attenuate synchronous vibration amplitudes and enhance dynamic stability at critical resonant frequencies and steady state rotational speeds.
Innovation Solution
A squeeze film damper design comprising a first component coupled to a support structure, a second component with a flexible spoke extending through a clearance hole, and a journal bearing, which includes features like tilting pads and flexible spokes for improved damping and reduced vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a conventional squeeze film damper design is used, then the damping function is provided, but the axial space consumption is excessive
Solution Approach 1:
The damper is segmented into a stationary component and a rotating component that are separated axially. The stationary component contains the supply passage and backflow prevention device, while the rotating component contains the journal bearing. This segmentation allows the damping function to be distributed across different axial positions, reducing the overall axial space consumption while maintaining effective damping through the flexible spokes that connect the components.
2Volume of moving object
If the damper size is reduced to save space, then axial space efficiency is improved, but the ability to attenuate synchronous vibration amplitudes is insufficient
Solution Approach 1:
Flexible spokes connect the stationary component to the rotating component, acting as flexible film elements that provide the necessary damping force. These flexible spokes can deform to accommodate the vibration attenuation requirements while occupying minimal axial space, effectively reducing synchronous vibration amplitudes without increasing the overall damper size.
3Volume of moving object
If the damper size is reduced to save space, then axial space efficiency is improved, but the dynamic stability enhancement is insufficient
Solution Approach 1:
The damper design incorporates dynamic elements including flexible spokes that can deform and a rotating component that moves relative to the stationary component. This dynamic configuration allows the damper to adapt to varying operating conditions and enhance dynamic stability while maintaining a compact axial footprint, as the dynamic elements provide the necessary stability enhancement without requiring additional axial space.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design achieves enhanced dynamic stability and reduced vibration by introducing additional external viscous damping, while being compact and space-efficient, thus meeting engineering standards and improving rotor-bearing system performance.
Implementation Method 1
The flexible spoke, wherein the flexible spoke has a first end and a second end, wherein the first end of the flexible spoke is coupled to the first component; wherein the second end of the flexible spoke is coupled to the second component and the flexible spoke is extending through the clearance hole
Implementation Method 2
The squeeze film damper generates a force on the rotor by squeezing a film of oil between two cylindrical cross-sectional regions, the outer region fixed to supports and considered rigid, and the inner region whirling with the rotor
Implementation Method 3
a journal bearing for a rotary shaft, wherein the journal bearing is coupled to the second component
Data Source
AI summary
A squeeze film damper includes a first component configured to be rigidly coupled to a support structure of a rotating machinery; a second component extending between first and second axial ends, the first axial end facing the first component, the second component having an outer surface configured to be at least partially surrounded by a squeeze film annulus; a journal bearing coupled to the second component for pivoting a rotary shaft; a flexible spoke, wherein the flexible spoke has first and second ends, the first end being rigidly coupled to the first component; the second component including a clearance hole extending in axial direction of the second component starting from the first axial end of the second component, wherein the flexible spoke second end is rigidly coupled to the second component and the flexible spoke extends through the clearance hole.