Gas Turbine Vibration Damper with Elastic Shim Plates
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Solution Overview
Problem
Gas turbines experience reduced strength and increased abnormal vibrations in the casing, particularly in the exhaust diffuser, due to prolonged use, which existing technologies have not adequately addressed.
Innovation Solution
A vibration damper system comprising reinforcing plates, flanges, shim plates, and sliding blocks is installed to dampen vibrations, featuring arc-shaped reinforcing plates connected by flanges with shim plates for elasticity and sliding blocks for radial movement, enhancing structural strength and vibration reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the exhaust diffuser is used to discharge combustion gas from the turbine, then the gas turbine can operate efficiently, but abnormal vibrations occur in the exhaust diffuser and turbine casing
Solution Approach 1:
A vibration damper is introduced as an intermediary component between the exhaust diffuser and the turbine casing. The damper includes a first flange connected to the turbine casing, a second flange connected to the exhaust diffuser, and an elastic body positioned between these flanges. This intermediary structure absorbs and dampens abnormal vibrations while allowing the exhaust diffuser to continue discharging combustion gas efficiently.
Solution Approach 2:
The elastic body in the vibration damper provides beforehand cushioning by absorbing vibrations before they can propagate through the turbine casing. The elastic body is pre-positioned between the first and second flanges to cushion against abnormal vibrations that occur during gas turbine operation, preventing these vibrations from affecting the overall structure.
2Strength
If the vibration damper includes rigid connection between exhaust diffuser and turbine casing, then structural strength is improved, but vibration transmission is increased
Solution Approach 1:
The connection between the exhaust diffuser and turbine casing changes from a completely rigid connection to a semi-rigid connection incorporating an elastic body. This parameter change allows the structure to maintain sufficient strength while introducing vibration-damping characteristics. The elastic body's material properties and geometric parameters are optimized to balance structural strength and vibration isolation.
3Strength
If multiple reinforcing plates and flanges are added to the vibration damper, then structural strength and vibration damping are improved, but device complexity increases
Solution Approach 1:
The vibration damper is segmented into distinct functional components: a first flange for connection to the turbine casing, a second flange for connection to the exhaust diffuser, an elastic body for vibration damping, and optional reinforcing plates for additional strength. This segmentation allows each component to be optimized for its specific function while maintaining overall system manageability and ease of installation.
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 system effectively reduces abnormal vibrations and improves the structural strength of the turbine casing, particularly in the exhaust diffuser, by damping vibrations and maintaining stability.
Implementation Method 1
The shim plate may be formed of a material having elasticity
Implementation Method 2
a vibration damper capable of damping vibrations occurring from a turbine casing
Data Source
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AI summary
A vibration damper capable of damping vibrations occurring from a turbine casing, an exhaust diffuser system including the vibration damper, and a gas turbine including the exhaust diffuser system are provided. The vibration damper installed on an outer casing of a gas turbine to damp vibrations generated in the gas turbine, the vibration damper includes a reinforcing support part including a plurality of reinforcing plates, a first flange coupled to both longitudinal ends of the reinforcing support part and fixed to a protruding support protruding from the outer casing, and a second flange disposed between the plurality of reinforcing plates to connect the plurality of reinforcing plates, wherein each of the plurality of reinforcing plates is erected and installed on an outer circumferential surface of the outer casing.