Rotor Wheel Damping Shells That Protect Blade Shanks From Wear
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Solution Overview
Problem
Conventional damping members in turbomachines cause wear on surrounding parts due to pivoting action, leading to damage of blade shanks and other components during operation.
Innovation Solution
A damping device comprising elastic members and support elements with smooth outer surfaces, allowing deformation and relative movement to dissipate forces, reducing contact and wear on shanks while maintaining effective damping performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a damping member is placed between the disc and blades to dissipate vibratory energy by dry friction, then vibration damping performance is improved, but the shanks of the blades suffer from wear and damage due to pivoting action
Solution Approach 1:
The patent introduces support elements as intermediary components between the damping member and the blade shanks. These support elements have smooth outer surfaces that minimize friction and contact stress, thereby protecting the blade shanks from wear while still enabling the damping member to dissipate vibratory energy through dry friction. The support elements act as a mediator that decouples the harmful pivoting action from the beneficial damping function.
Solution Approach 2:
The damping member is designed as a thin-walled structure with hollow spaces, which allows it to deform elastically under vibratory loads. This flexible shell structure enables the damping member to accommodate relative movements and pivoting actions without transmitting excessive forces to the blade shanks, thereby reducing wear while maintaining damping effectiveness.
2Reliability
If the damping member is constrained within the cavity delimited by blade shanks, then damping function is achieved, but the pivoting motion causes damage to the delimiting shanks
Solution Approach 1:
The support elements serve as intermediary components that separate the damping member from direct contact with the blade shanks. The smooth outer surfaces of the support elements reduce friction and contact pressure, allowing the damping member to perform its function within the cavity without compromising the strength and integrity of the delimiting shanks.
Solution Approach 2:
The patent modifies the surface parameters of the components in contact with the blade shanks by providing smooth outer surfaces on the support elements. This parameter change (surface finish) reduces the coefficient of friction and contact stress, thereby protecting the blade shanks from damage while maintaining the damping function within the cavity.
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 damping device reduces tangential forces on shanks and other parts, minimizing wear and ensuring efficient vibration damping without damaging the surrounding components.
Implementation Method 1
The elastic member enables the damper to deform, allowing relative movements of the support elements and dissipating some of the forces to which it is subjected.
Implementation Method 2
dissipate the vibratory energy by dry friction between these members and the impeller
Data Source
AI summary
A damper for an impeller of an aircraft turbomachine includes an elastic member housed in two metallic half-shells so as to allow a relative movement of the half-shells relative to one another.