Multi-Leaved Brake Damping Disk for Aircraft Vibration and Noise
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Solution Overview
Problem
Aircraft brake systems using carbon composite friction disks face issues with vibration and noise due to the high-speed operations, which can lead to material degradation and reduced braking performance.
Innovation Solution
The implementation of a multi-leaved core damping disk with non-continuous structures and materials like carbon composite, silicon carbide, or silicon nitride, which are designed to absorb vibrational energy and reduce brake noise by incorporating features such as sloped contact surfaces and spacers, enhancing the damping capabilities and heat management within the brake assembly.
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 brake disk is divided into multiple segments or layers with different material properties. The friction disk includes a carbon composite friction surface for heat resistance, while the core structure is segmented into multiple damping elements that can independently absorb vibration, resolving the contradiction between heat resistance and vibration control
Solution Approach 2:
The brake disk employs a composite structure combining carbon composite materials for the friction surface (providing heat resistance) with damping materials or structures in the core (providing vibration absorption). This multi-material approach allows simultaneous achievement of thermal performance and vibration control
2Temperature
If friction disks are made of steel to withstand heat, then heat resistance is improved, but durability decreases at high speeds
Solution Approach 1:
The invention transitions from steel to carbon composite materials for the friction disk, leveraging the superior high-temperature properties of carbon composites. The composite structure maintains structural integrity at high speeds and temperatures, significantly improving durability while retaining heat resistance
3Temperature
If carbon composite disks are used for high temperature performance, then heat resistance is improved, but brake noise is generated
Solution Approach 1:
A damping core or intermediary layer is introduced between the carbon composite friction surfaces. This intermediary structure absorbs vibrational energy that would otherwise be transmitted as noise, while allowing the carbon composite surfaces to maintain their high-temperature performance
Solution Approach 2:
The invention modifies the physical and mechanical parameters of the brake disk structure, such as introducing damping materials with specific loss factors, optimizing thickness ratios, and adjusting structural stiffness to shift vibration frequencies away from noise-generating ranges, thereby reducing brake noise while preserving heat resistance
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 multi-leaved core damping disk effectively reduces brake vibration and noise while maintaining effective heat dissipation and braking performance, improving the durability and efficiency of the aircraft brake system.
Implementation Method 1
multi-leaved core damping disk... designed to absorb vibrational energy and reduce brake noise
Implementation Method 2
carbon composite disks... better suited for high temperature use... configured to withstand and dissipate the heat generated from contact
Data Source
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AI summary
A disk brake assembly comprising a pressure plate coupled to a first rotor friction disk of a plurality of rotor friction disks and a plurality of stator friction disks located between the pressure plate and an end plate, wherein the at least one stator friction disk comprises a disk damping core (800) comprising at least two disk leaves (802a, 802b) comprising a first disk leaf (802a) and a second disk leaf (802b), the first disk leaf having at least one first sloped contact surface (804a) formed in the first disk leaf as manufactured, and the second disk leaf having at least one second sloped contact surface (804b) formed in the second disk leaf as manufactured.