Compliant Bearing with Sensor Web for Load Capacity
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Solution Overview
Problem
Existing compliant bearings face limitations in load capacity due to misalignments, geometrical tolerances, thermal distortions, and negative damping, which affect their ability to maintain proper film thickness and stability under varying operating conditions.
Innovation Solution
The design incorporates axial compliant features through bearing surface springs and damping materials in interstitial areas, allowing deformation and tilt of the bearing surface, and integrates sensor webs for monitoring performance, thereby enhancing load capacity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If fixed pads are tilted in a given rotational direction to achieve hydroplaning, then friction is reduced and load capacity is increased, but the bearing becomes sensitive to misalignments and geometrical tolerances
Solution Approach 1:
The bearing pads are made dynamically adjustable through compliant mounting mechanisms that allow the pads to tilt and position themselves optimally during operation. This dynamic adaptation enables the pads to maintain effective hydroplaning angles despite misalignments or geometrical tolerances in the shaft collar and bearing surface, thereby preserving load capacity while reducing sensitivity to installation errors.
Solution Approach 2:
The patent employs compliant mounting mechanisms that allow the pad tilt angle and position to change as a parameter in response to operating conditions. This parameter adjustment capability enables the bearing to optimize its hydroplaning performance under varying loads and misalignment conditions, maintaining high load capacity while accommodating geometrical tolerances and thermal distortions.
2Force
If spiral grooves are used to maximize load capability, then load capacity is improved, but negative damping is generated at certain operating conditions
Solution Approach 1:
The bearing surface is divided into distinct zones with different groove patterns and compliance characteristics. By localizing spiral grooves to specific areas while providing compliant mounting in other regions, the design maintains high load capability where spiral grooves are present while allowing compliant sections to provide damping and stability where negative damping would occur, thus resolving the contradiction between load capability and stability.
3Speed
If thin film thickness is used to support thrust load in gas thrust bearings, then the bearing operates with low viscosity gas lubricant, but misalignments and thermal distortions negatively impact thrust load capability
Solution Approach 1:
The compliant mounting mechanisms allow the bearing pads to adjust their position and tilt angle in response to thermal distortions and misalignments that occur during operation. This parameter adjustment compensates for changes in film thickness distribution caused by thermal effects, maintaining optimal thrust load capability despite operating with low viscosity gas lubricant that requires precise film thickness control.
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 significantly increases load capacity, mitigates negative damping, and maintains proper film thickness, while the sensor web enables real-time monitoring and adjustment, improving the bearing's operational stability and performance.
Implementation Method 1
compliant arrangements include an array of fixed pads that are all tilted in a given rotational direction
Implementation Method 2
damping materials in interstitial areas, allowing deformation and tilt of the bearing surface
Implementation Method 3
Such increasing load capacity by reduced friction may be achieved by controlled hydroplaning
Data Source
Figure 1
Figure 1A~1B
Figure 1C
AI summary
A first embodiment of a compliant bearing includes a main body and a bearing surface. The main body and the bearing surface may be engaged with one another via one or more bearing surface springs configured such that the bearing surface is compliant with respect to the main body. A second embodiment of a compliant bearing includes a main body and at least one bearing pad. The main body and the bearing pad may be engaged with one another via one or more pad radial and/or pad axial springs configured such that the bearing pad is compliant with respect to the main body. A sensor web may be integrated into the compliant bearing. In one embodiment the sensor web comprises at least one sensor configured as a strain gauge and affixed to a bearing surface spring.