Tilting-Pad Radial Bearing Oil Flow Control to Prevent Segment Flutter
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Solution Overview
Problem
Conventional radial tilting pad bearings face challenges in efficiently regulating oil mass flow, leading to potential segment flutter due to uneven lubrication, particularly in high-speed applications, where manual adjustment based on temperature is time-consuming and inefficient.
Innovation Solution
Implementing individually controllable oil supply for each oil pocket in radial tilting pad bearings, using either throttle valves or self-learning systems to adjust oil mass flow based on fixed characteristic curves or adaptive learning, ensuring optimal lubrication and minimizing power loss and wave amplitude.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same oil supply geometry is used for each oil pocket, then the device complexity is reduced, but the lubrication uniformity deteriorates leading to segment flutter
Solution Approach 1:
The patent implements different oil supply geometries for different oil pockets based on their specific requirements. Upper tilting segments receive higher oil mass flow rates through larger nozzle diameters or greater numbers of nozzles, while lower segments receive lesser flow. This local differentiation ensures uniform lubrication across all segments and eliminates segment flutter, resolving the contradiction between device simplicity and reliability.
2Manufacturing precision
If manual valve adjustment is used for temperature-based control, then the manufacturing precision is improved, but the loss of time increases due to iterative adjustment
Solution Approach 1:
The patent employs a self-regulating oil supply system where each oil pocket is equipped with its own controllable oil supply that automatically adjusts oil mass flow based on local temperature feedback. This eliminates the need for manual iterative adjustments while maintaining precise temperature control, simultaneously improving manufacturing precision and eliminating time loss.
3Reliability
If higher oil mass flow is supplied to all oil pockets, then the reliability is improved by preventing segment flutter, but the loss of energy increases due to excessive lubrication
Solution Approach 1:
The patent optimizes oil mass flow distribution by supplying higher flow rates only to upper tilting segments that are prone to segment flutter, while supplying lesser flow rates to lower segments. This localized oil supply strategy prevents segment flutter in critical areas while minimizing excessive lubrication elsewhere, thereby reducing overall energy loss while maintaining reliability.
Solution Approach 2:
The patent dynamically adjusts oil supply parameters (mass flow rate, nozzle diameter, number of nozzles) for each oil pocket based on operating conditions and segment position. By changing these parameters locally rather than uniformly across all pockets, the system prevents segment flutter where needed while minimizing energy consumption overall.
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 approach reduces total oil mass flow, minimizes friction losses, and optimizes rotor dynamics by providing needed lubrication only to each segment, preventing segment flutter and enhancing operational efficiency.
Implementation Method 1
The hydrodynamic oil supply to radial tilting segment bearings is typically provided via the oil pockets between the individual tilting segments
Implementation Method 2
each oil pocket has its own individually controllable oil supply, via which the oil mass flow supplied to the respective oil pocket can be adjusted
Data Source
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AI summary
The invention relates to a tilting-segment radial bearing (1) for mounting a shaft (2), comprising a plurality of tilting segments (3) which are distributed over the circumference of the tilting-segment radial bearing (1) and are spaced apart from one another, wherein oil pockets (4) are configured between the individual tilting segments (3), which oil pockets (4) can be loaded via an oil feed (5) with an oil mass flow (m). Each oil pocket (4) has a dedicated individually controllable oil feed (5), via which the oil mass flows (m1 to m4) are fed to the respective oil pocket (4) and can be set. Furthermore, the invention relates to a method for controlling the oil mass flow (m) in a tilting-segment radial bearing (1) of this type.