Gas Turbine Housing Dampers for Modal Peak Vibration Control
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Solution Overview
Problem
Gas turbine engine inter compressor casings experience vibration issues due to modal interference within the engine speed range, leading to potential peak displacement points that can cause structural concerns.
Innovation Solution
A damper is strategically placed on the casing at potential peak displacement points, with one end fixed to the casing and the other end providing an interference fit that prevents it from relaxing, thereby applying a bias force to dampen vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the inter compressor casing is formed of sheet metal welded to form a full hoop structure, then the structural integrity and manufacturing ease are improved, but vibration issues arise due to modal interference within the engine speed range
Solution Approach 1:
The patent applies local damping treatment at specific peak displacement points on the casing rather than treating the entire structure uniformly. This localized approach targets the specific vibration problem areas while maintaining the overall structural integrity of the sheet metal hoop structure.
Solution Approach 2:
A damper is introduced as an intermediary element between the vibrating casing wall and the vibration source. The damper absorbs and dissipates vibrational energy at peak displacement points, acting as a mediator to reduce the harmful vibration effects while preserving the structural design.
2Object-affected harmful factors
If dampers are placed at peak displacement points to reduce vibration, then vibration displacement is reduced, but the device complexity increases
Solution Approach 1:
Instead of applying damping treatment throughout the entire casing structure, the patent implements dampers only at specific peak displacement points identified through modeling. This localized approach minimizes the addition of components and complexity while effectively addressing the vibration problem at critical locations.
Solution Approach 2:
The patent applies damping treatment partially at the most critical peak displacement points rather than excessively throughout the entire structure. This partial action approach achieves sufficient vibration reduction with minimal added complexity by focusing resources on the most problematic areas.
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 implementation of the damper effectively reduces vibration displacement at peak points, enhancing the structural integrity and operational stability of the gas turbine engine casing.
Implementation Method 1
A damper is placed on a wall of the casing at the at least one peak displacement point. The damper has one end fixed to the casing, and a second end not fixed to the casing and the second end provides an interference fit such that the second end cannot move to a relaxed position of the second end due to the wall of the casing.
Data Source
AI summary
A gas turbine engine includes a compressor section, a combustor and a turbine section. At least one casing surrounds at least one of the compressor and turbine section. The at least one casing is formed of sheet metal. The at least one casing has at least one potential peak displacement point due to vibration across a speed range of the one of the compressor and turbine section. A damper is placed on the casing at the at least one potential peak displacement point. The damper has one end fixed to the casing, and a second end not fixed to the casing and the second end provides an interference fit such that the second end cannot move to a relaxed position of the second end due to the wall of the casing. A method is also disclosed.