Segmented Damper Member for Rotary Machine Vibration Control
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Solution Overview
Problem
In rotary machines like gas turbines, damper pins wear out over time, leading to a change in their cross-sectional shape from cylindrical to polygonal, which compromises their ability to effectively dampen vibration, affecting the machine's operation.
Innovation Solution
A rotary machine design featuring a damper member with a first and second damper, each with abutting surfaces, and an elastic member that bonds them together, allowing for effective vibration damping through friction and elastic deformation, even as the damper wears out, enabling easy replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cylindrical damper pin is used to dampen vibration between turbine rotor blades, then vibration damping is achieved through frictional force, but the damper pin wears out over time and its cross-sectional shape changes from cylindrical to polygonal, compromising damping characteristics
Solution Approach 1:
The damper member is divided into multiple dampers (first damper, second damper, third damper) arranged in series between adjacent rotor blades. Each damper has its own abutting surfaces that contact the rotor blade platforms. This segmentation allows individual dampers to be replaced if worn, while other dampers continue to provide damping function, thereby extending the overall service life of the damping system.
Solution Approach 2:
The invention changes the geometric parameters of the damper surfaces by providing inclined abutting surfaces (first abutting surface, second abutting surface, third abutting surface) at specific angles relative to the radial direction. This parameter change allows the dampers to maintain effective contact and frictional damping characteristics even as individual dampers wear, preserving damping reliability over extended service periods.
2Ease of operation
If a single cylindrical damper pin contacts both platforms of adjacent turbine rotor blades, then vibration damping is provided, but the damper wears out and requires replacement, affecting machine operation
Solution Approach 1:
The damping system is segmented into multiple independent damper units (first damper, second damper, third damper) rather than using a single cylindrical pin. This segmentation enables selective replacement of individual worn dampers without replacing the entire damping system, improving ease of maintenance while ensuring continuous operation through the remaining functional dampers.
Solution Approach 2:
The invention provides redundant damping capacity by installing multiple dampers in series before any single damper fails. This beforehand cushioning ensures that even if one or more dampers wear out, the remaining dampers continue to provide sufficient vibration damping, maintaining reliable continuous operation of the rotary machine.
3Reliability
If multiple dampers with abutting surfaces and an elastic member are used, then vibration energy is converted to thermal energy through friction and elastic absorption, significantly reducing vibration, but the device complexity increases
Solution Approach 1:
The damper member is segmented into multiple dampers (first, second, third dampers) with distinct abutting surfaces. Each damper provides friction-based vibration damping through its abutting surfaces contacting the rotor blade platforms. The elastic member bonds the dampers together, creating a modular structure that achieves superior vibration reduction while maintaining manageable complexity through standardized repetitive units.
Solution Approach 2:
The damper member combines multiple damper elements with different functional characteristics - the dampers provide friction-based damping through their abutting surfaces, while the elastic member provides elastic energy absorption. This composite structure integrates friction damping and elastic damping mechanisms to achieve enhanced vibration reduction reliability.
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 design significantly reduces vibration in rotary machines by converting vibration energy into thermal energy through friction and elastic absorption, ensuring stable operation and easy maintenance by allowing for easy replacement of worn-out damper members.
Implementation Method 1
an elastic member that bonds together the first damper and the second damper
Implementation Method 2
the vibration is damped by a frictional force at the contact points between the dampers and the turbine rotor blades
Data Source
AI summary
A rotary machine includes a rotary shaft that rotates around an axis, a plurality of rotor blades arranged on an outer peripheral side of the rotary shaft in a circumferential direction in which the rotor blade has a blade root, a platform, and a blade main body; and each damper member provided radially inward of the platform, in which the platform includes a first end surface that faces one side in the circumferential direction, and a second end surface that faces the other side in the circumferential direction so that the second end surface faces the first end surface of the adjacent other platform, and the damper member includes a first damper provided on the first end surface and having a first abutting surface, a second damper that has a second abutting surface slidably abutting the first abutting surface of the first damper and is abuttable on the second end surface, and an elastic member that bonds together the first damper and the second damper.