Split Friction Disk Assembly Vibration Damping
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Solution Overview
Problem
Aircraft brake systems using carbon composite friction disks face issues with vibration and noise, which can lead to performance variability and heat-related damage during high-speed landings and rejected takeoffs.
Innovation Solution
The use of split friction disk assemblies with cavities in the contact surfaces, which reduces vibration and noise by creating a structural discontinuity and limiting the contact area, combined with solid disk assemblies arranged in specific patterns to enhance braking performance and consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If carbon composite friction disks are used to withstand high temperature, then heat resistance is improved, but vibration and noise increase
Solution Approach 1:
The friction disk is divided into two separate disk halves that are assembled together with a gap between them. This segmentation creates a discontinuity in the contact surface that disrupts vibration patterns and reduces noise generation while maintaining the carbon composite material's heat resistance properties
Solution Approach 2:
The contact surface between disk halves features a localized gap or discontinuity rather than a continuous surface. This local modification changes the vibration characteristics at the contact interface, reducing overall vibration and noise while preserving the thermal performance of the carbon composite material
2Force
If solid friction disks are used for braking, then braking force is improved, but heat accumulation increases leading to material destruction
Solution Approach 1:
The friction disk is segmented into two halves with a gap between them, creating thermal pathways that allow heat to dissipate more effectively. This segmentation prevents excessive heat accumulation while maintaining sufficient braking force through the friction interface
3Strength
If continuous contact surface is used in friction disks, then structural integrity is improved, but vibration damping decreases
Solution Approach 1:
The friction disk is divided into two halves that maintain structural integrity through their individual strength while the gap between them provides vibration damping. The segmented structure allows each half to remain strong while the discontinuity disrupts vibration patterns
Solution Approach 2:
The gap or discontinuity between disk halves acts as an intermediary element that dampens vibration. This intermediate space disrupts the transmission of vibrational energy while allowing the disk halves to maintain their structural integrity
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 effectively dampens vibration and noise, improving braking performance and reducing variability, while extending the lifespan of friction disks through strategic placement and reuse of materials.
Implementation Method 1
The use of split friction disk assemblies with cavities in the contact surfaces, which reduces vibration and noise by creating a structural discontinuity and limiting the contact area
Data Source
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AI summary
A disk brake system (20 comprising a combination of split friction disk assemblies (95) and solid disk assemblies (80), these split friction disk assemblies (95) and/or solid disk assemblies (80) being arranged together.