Split Brake Disk Cavity for Vibration Damping and Thermal Expansion
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Solution Overview
Problem
Aircraft brake systems using carbon composite friction disks suffer from vibration and noise issues, and the heat generated during high-speed landings and rejected takeoffs can cause these disks to bow, reducing braking performance and increasing variability.
Innovation Solution
A split friction disk assembly with two disk halves featuring a circumferentially extending recess on each half, forming a cavity when assembled, which dampens vibration, limits contact area, and accommodates thermal expansion to reduce bowing and improve braking consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If carbon composite materials are used for friction disks, 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. Each disk half includes a circumferentially extending recess, and when assembled, these recesses form a cavity between the disk halves. This segmentation creates a structural discontinuity that dampens vibration and reduces noise while maintaining the heat resistance benefits of carbon composite materials.
2Force
If high braking force is applied during high-speed landings, then stopping performance is improved, but heat generation increases causing disk bowing
Solution Approach 1:
The cavity formed by the recesses in each disk half creates a localized region with different structural properties. This cavity provides an expansion region that accommodates thermal growth of the carbon composite material during high-speed braking, allowing the disk to absorb thermal expansion locally without bowing, thereby maintaining braking performance consistency.
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 reduces brake vibration and noise while enhancing braking performance and consistency by providing a structural discontinuity at contact surfaces and an expansion region for thermal expansion, leading to improved braking performance and reduced variability.
Implementation Method 1
The two disk halves are assembled into a split friction disk such that their recesses face each other, forming a cavity. Non-friction surfaces where the disk halves contact each other are in physical contact, but do not form a continuous structure. This structural discontinuity at the contact surfaces serves to damp vibration.
Implementation Method 2
the cavity provides an expansion region for brake material. Thus, in addition to reducing brake vibration and brake noise, embodiments of the present invention also provide for improved braking performance under certain conditions, and for decreased variability in braking performance.
Data Source
AI summary
An annular-shaped disk half (50) of a split friction disk assembly for a disk brake system. The disk half (50) includes a friction surface (56) and a non-friction surface (58). The friction surface (56) is at an axial end of the disk half (50). The non-friction surface (58) is at an axial end of the disk half (50) on a side opposite of the friction surface (56). The non-friction surface (58) includes a contact surface (60A) and a non-contact surface (62). The non-contact surface (62) is recessed from the contact surface (60A).