Bearing Damper Ring Leakage Paths for Tuned Oil Film Stiffness
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Solution Overview
Problem
Turbomachinery bearing assemblies face challenges in achieving optimal stiffness to effectively dampen radial forces and vibrations, as existing oil damper cavities often result in either unsatisfactorily low or high stiffness levels, lacking an intermediate level suitable for specific applications.
Innovation Solution
The introduction of a damper ring with a radially inner edge fitting into an annular groove of a bearing ring and a radially outer edge featuring arc portions that engage the housing, along with controlled leakage portions to form a leakage path, allowing for adjustable oil flow and stiffness in the oil damper cavity between the bearing ring and housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an oil damper cavity is introduced between the housing and bearing outer ring to dampen radial forces, then vibration damping is improved, but the stiffness level becomes difficult to optimize (either too low or too high)
Solution Approach 1:
The damper ring is segmented with controlled leakage portions that divide the oil damper cavity into multiple chambers. This segmentation allows the oil to be distributed and controlled in a way that provides intermediate stiffness levels, resolving the contradiction between vibration damping and stiffness optimization.
Solution Approach 2:
The controlled leakage portions create local variations in the oil damper cavity structure. By having specific regions with different leakage characteristics, the system achieves localized stiffness control that enables optimal intermediate stiffness levels for vibration damping applications.
2Object-affected harmful factors
If the oil damper cavity is designed to accommodate relative radial displacement by pressure variation, then damping capability is improved, but the structural complexity increases
Solution Approach 1:
The damper ring serves multiple functions simultaneously: it acts as a structural component defining the oil damper cavity, provides the controlled leakage portions for stiffness control, and enables pressure variation to accommodate radial displacement. This multi-functionality reduces overall structural complexity while maintaining damping capability.
Solution Approach 2:
The oil damper cavity system is self-regulating through pressure variation. The oil pressure automatically adjusts to accommodate relative radial displacement between the bearing outer ring and housing, eliminating the need for additional complex control mechanisms.
3Adaptability or versatility
If controlled leakage portions are added to the damper ring, then stiffness control is improved, but manufacturing complexity increases
Solution Approach 1:
The controlled leakage portions allow for parameter changes in the oil flow characteristics. By adjusting the size, shape, and distribution of the leakage portions, the stiffness can be precisely controlled without requiring complex manufacturing processes, as the leakage features can be integrated into the damper ring design.
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
This configuration provides a balanced stiffness level by controlling oil leakage, enhancing the damping of relative movements between the rotor and housing, thereby improving vibration mitigation in turbomachinery.
Implementation Method 1
at least one controlled leakage portion radially recessed from the housing and forming a leakage path leading axially out from the oil damper cavity
Implementation Method 2
The oil damper cavity can be designed to be fed with a certain flow rate of oil during operation, and to accommodate a certain extent of relative radial displacement between the bearing outer ring and the housing by pressure variation
Data Source
AI summary
The bearing assembly can extend between a rotor and a housing, have a plurality of bearing rolling elements mounted for rotation within a bearing ring, an oil damper cavity between the bearing ring and the housing, an oil inlet path to feed the oil damper cavity, and at least one damper ring defining a corresponding axial limit to the oil damper cavity and having a radially inner edge received in a corresponding annular groove defined in the bearing ring, and a radially outer edge having at least one arc portion extending radially outwardly relative the annular groove and engaging the housing, and at least one controlled leakage portion radially recessed from the housing and forming a leakage path leading axially out from the oil damper cavity.