Turbo Machine Stator Vane Vibration Reduction Device
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Solution Overview
Problem
Existing vibration reduction technologies for stator vanes in turbo machines are not effective enough and are difficult to install, as they rely on frictional forces and viscoelastic materials that do not adequately address excessive vibrations and are cumbersome to implement.
Innovation Solution
A vibration reduction device comprising an annular base member, an elastomeric damping member in slidable contact with the base member, and a preloading member that applies a radially inward preload to the elastomeric damping member, enhancing damping action through frictional resistance and viscoelastic properties, with a simple and stable structure for effective vibration reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bent piece of sheet metal or viscoelastic material is used as a damper, then some damping action is provided, but the vibration reduction effectiveness is insufficient and the installation is cumbersome
Solution Approach 1:
The invention changes the physical state and mechanical properties of the damping material by applying a preload force to the elastomeric damping member. This preload transforms the material from a passive element to an active damping component that generates frictional resistance during vibration, significantly improving vibration reduction effectiveness while maintaining simple installation through standardized mounting structures
Solution Approach 2:
The invention uses a composite structure combining an elastomeric damping member with a preload application mechanism. The elastomeric material provides base damping properties, while the preload structure enhances this by creating frictional interfaces that actively resist vibration. This composite approach achieves superior vibration reduction compared to单一 materials while keeping the overall assembly straightforward to install
2Reliability
If frictional force is created between damping components, then damping action is provided, but the damping effect is insufficient without adequate preload
Solution Approach 1:
The invention applies a preload force parameter to the elastomeric damping member, transforming it from a low-effect passive damper to a high-effect active damper. The preload creates sufficient normal force at the friction interface to generate adequate frictional resistance during vibration, significantly enhancing the damping effect without requiring complex multi-component systems
Solution Approach 2:
The preload structure acts as an intermediary mechanism that translates a simple compressive force into effective frictional damping. This intermediary element (the preload application structure) enables the elastomeric material to generate sufficient frictional resistance by creating the necessary contact pressure, achieving strong damping effects with relatively simple structural implementation
3Reliability
If layers of viscoelastic material are attached to the outer circumferential surface, then some damping action is provided, but the installation is difficult and effectiveness is limited
Solution Approach 1:
The invention uses an elastomeric damping member in the form of a flexible ring or shell that can be easily fitted around the base member. This flexible structure provides comprehensive damping coverage while being simple to install, replacing the difficult-to-attach layered viscoelastic material with a single elastomeric component that maintains damping effectiveness throughout the entire circumferential surface
Solution Approach 2:
The elastomeric material undergoes a parameter change when preload is applied, transitioning from a soft, low-stiffness material to a stiffened damping element that generates frictional resistance. This parameter transformation enables the material to provide strong damping effects while maintaining the simplicity of installation, as the material itself adapts its mechanical properties rather than requiring complex installation procedures
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 solution provides a more effective and easier-to-install vibration reduction system for stator vanes, significantly reducing vibrations by leveraging the improved damping effect of the elastomeric damping member and preloading mechanism, while ensuring durability and protection from external influences.
Implementation Method 1
the elastomeric damping member to demonstrate an improved damping effect owing to the frictional resistance created between the elastomeric damping member and the base member as a result of the relative movement that can occur therebetween when the state vanes vibrate
Implementation Method 2
an elastomeric damping member (100) surrounding and in slidable contact with an outer circumferential surface of the base member
Data Source
AI summary
Provided is a vibration reduction device for stator vanes (30) positioned behind rotor blades (28) in a turbo machine, comprising an annular base member (80) having a cylindrical shape concentric around a central axis of the casing and supporting base ends of the stator vanes which extend radially inward from an inner circumferential surface of the base member, an elastomeric damping member (100) surrounding and in slidable contact with an outer circumferential surface of the base member, and a preloading member (102) surrounding an outer circumferential surface of the elastomeric damping member and configured to apply a preload directed radially inward to the elastomeric damping member.