Jet Engine Center Vent Tube Damper for Vibration Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenge is to suppress vibration of a center vent tube in a jet engine without clogging it, as existing solutions that attenuate vibration by inserting a cylindrical object can cause blockages due to the object's diameter increase during rotation.
Innovation Solution
A vibration reduction damper with a sliding portion is designed to be in contact with the inner wall of the center vent tube, avoiding the regions with vent holes, allowing for friction-based vibration attenuation without obstructing airflow through the vent holes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cylindrical object is disposed inside the center vent tube to attenuate vibration, then vibration of the center vent tube is reduced, but the center vent tube may become clogged by the cylindrical object
Solution Approach 1:
The sliding portion is designed with a specific geometric shape that provides different properties in different regions: it has friction contact capability with the inner wall for vibration damping, while simultaneously having gaps or openings that allow airflow through the vent holes. This local differentiation resolves the contradiction between vibration attenuation and preventing clogging.
Solution Approach 2:
The sliding portion is positioned to contact only specific regions of the inner wall, avoiding direct contact with the vent hole areas. This segmentation of contact zones allows the damper to function without blocking the vent holes, thus preventing clogging while still providing vibration attenuation.
2Reliability
If the cylindrical object contacts the inner wall to provide friction damping, then vibration is attenuated, but the object may obstruct airflow through vent holes
Solution Approach 1:
The sliding portion is designed with a specific geometric shape that provides different properties in different regions: it has friction contact capability with the inner wall for vibration damping, while simultaneously having gaps or openings that allow airflow through the vent holes. This local differentiation resolves the contradiction between vibration attenuation and preventing clogging.
Solution Approach 2:
The sliding portion acts as an intermediary element that mediates between the vibration attenuation function and the airflow function. By positioning and shaping it appropriately, it provides friction damping while allowing air to pass through the vent holes unobstructed.
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
This solution effectively reduces vibration of the center vent tube while preventing clogging, ensuring uninterrupted airflow and maintaining the vent tube's functionality.
Implementation Method 1
the sliding portion which is slidably in contact with the inner wall surface of the center vent tube... when the center vent tube vibrates, friction occurs between the center vent tube and the vibration reduction damper, and the vibration of the center vent tube is attenuated
Data Source
AI summary
A vibration reduction damper is disposed inside a center vent tube having vent holes which pass therethrough in the radial direction, and has a sliding portion which comes slidably into contact with the inner wall surface of the center vent tube while avoiding the region in which the vent holes are formed.