Aircraft Brake Disc Interfaces for Low-Friction Vibration Attenuation
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Solution Overview
Problem
Existing methods for attenuating vibrations in aircraft brake wheels during braking, such as using restrictors and anti-vibration rings, either limit brake control dynamics or increase complexity and weight.
Innovation Solution
Selecting bracket/tenon and/or bracket/bar pairs with a friction coefficient of less than or equal to 0.6, achieved through material selection or coatings, to reduce the amplitude of vibrations during braking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If restrictors are used in the hydraulic circuit to prevent hydraulic jerking, then vibrations are reduced, but brake control dynamics are limited
Solution Approach 1:
The invention changes the friction coefficient parameter of the interface between brackets and tenons/bars from a conventional high value to a low value (≤0.6). This parameter change reduces vibrations at the source without affecting hydraulic flow or brake control dynamics, thereby resolving the contradiction between vibration reduction and maintaining brake performance.
2Object-affected harmful factors
If an anti-vibration ring is added to the torque tube base, then vibrations are reduced, but device complexity and weight increase
Solution Approach 1:
The invention extracts the vibration attenuation function from the torque tube structure (where anti-vibration rings would be added) and relocates it to the bracket/tenon and bracket/bar interfaces. By selecting materials or coatings with low friction coefficients at these interfaces, the vibration reduction function is achieved without modifying the torque tube base, thereby avoiding increased complexity and weight.
3Object-affected harmful factors
If an anti-vibration ring is added to the torque tube base, then vibrations are reduced, but weight increases
Solution Approach 1:
The invention extracts the vibration attenuation function from the torque tube structure and relocates it to the bracket/tenon and bracket/bar interfaces. This eliminates the need for additional anti-vibration rings on the torque tube base, thereby avoiding any increase in torque tube weight while still achieving effective vibration reduction.
4Force
If high friction coefficient interfaces are used between brackets and tenons/bars, then braking force is maintained, but vibration amplitudes increase
Solution Approach 1:
The invention changes the friction coefficient parameter from high to low (≤0.6) at the bracket/tenon and bracket/bar interfaces. This parameter change reduces vibration amplitudes while maintaining sufficient braking force through proper material selection and coating, thereby resolving the contradiction between force transmission and vibration generation.
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 approach effectively limits vibration amplitudes to less than 20 g, meeting aircraft manufacturer specifications while avoiding the drawbacks of previous solutions.
Implementation Method 1
the selection of bracket/tenon and/or bracket/bar pairs with a friction coefficient that is less than or equal to 0.6
Data Source
AI summary
The invention relates to a method for attenuating vibrations of an aircraft wheel/brake assembly arising during braking, the brake comprising rotor discs (2b) rotationally driven with the wheel by means of bars (5) secured to the wheel and engaging in notches (3b) of the rotor discs, and stator discs (2a) which are kept rotationally immobile by means of tenons (5) secured to a torque tube (1) of the brake and engaged in notches (3a) of the stator discs, the notches having flanks that are protected by brackets (7). The method involves selecting bracket/tenon pair and/or bracket/bar pairs with a coefficient of friction less than or equal to 0.6.