Detachable Blade Damper Housing for Vibration and Flutter Control
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Solution Overview
Problem
Existing vibration damping devices for rotating machine blades are bulky and difficult to replace, making them unsuitable for downsized applications and prone to deterioration.
Innovation Solution
A vibration damping device with a detachable housing containing an attenuation material, installed under the blade's platform, allowing for space-saving and easy replacement, and optionally incorporating a heavy member for mistuning to suppress flutter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the vibration damper is encapsulated in the cavity formed in the blade, then the vibration damping effect is achieved, but the blade thickness is increased
Solution Approach 1:
The vibration damping function is extracted from the blade structure itself and placed into a separate, removable housing that contains the attenuation material. This allows the damping functionality to be achieved without permanently increasing the blade thickness, as the housing can be installed in a detachable manner.
Solution Approach 2:
The vibration damping system is segmented into a separate housing component that can be independently installed and removed from the blade. This segmentation allows the damping function to be added without modifying the fundamental blade structure and thickness.
2Reliability
If the vibration damper is encapsulated in the cavity formed in the blade, then the vibration damping effect is achieved, but the replacement difficulty increases
Solution Approach 1:
The vibration damping system is divided into a separate, modular housing that can be independently removed and replaced. This segmentation enables easy maintenance and replacement of the attenuation material without damaging or modifying the blade structure.
Solution Approach 2:
The housing is designed with dynamic, detachable connections to the blade, allowing it to be easily installed and removed as needed. This dynamic design contrasts with permanent encapsulation, enabling flexible maintenance and replacement operations.
3Weight of moving object
If the housing includes space independently from the vibration damping space, then the weight is reduced, but the volume increases
Solution Approach 1:
The housing is designed with non-uniform internal structure, creating specific void spaces or chambers that are strategically positioned. This local quality variation allows weight reduction through strategic empty spaces while maintaining the necessary vibration damping volume where attenuation material is placed.
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 space-saving, easily replaceable vibration damping system that effectively reduces blade vibrations and suppresses flutter, maintaining blade strength without compromising it.
Implementation Method 1
an attenuation material disposed in a vibration damping space formed inside the housing
Implementation Method 2
an attenuation material disposed in a vibration damping space formed inside the housing
Implementation Method 3
it is possible to suppress flutter by adjusting the natural frequency of each blade of the rotating machine by changing the heavy member (so-called mistuning)
Implementation Method 4
a heavy member made of a material higher in density than the attenuation material
Data Source
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AI summary
A vibration damping device for a blade of a rotary machine according to an embodiment of the present invention is provided with: one or more housings configured so that the housings can be housed in a cavity formed below the platform of the blade and so that the housings are mountable to and removable from the blade; and damping materials provided in vibration damping spaces formed in the housings.