Foam-Filled Honeycomb Duct for Aircraft ECS Noise Absorption
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Solution Overview
Problem
Conventional environmental control system ducts in vehicles, such as aircraft, suffer from noise generation due to air movement, which is often mitigated by noise attenuating mufflers that increase weight, volume, and cost, compromising performance in high-performance vehicles.
Innovation Solution
The implementation of ducts with a foam-filled honeycomb core structure that provides both sound absorption and thermal insulation, reducing the need for dedicated noise attenuating mufflers by integrating a tubular foam-filled honeycomb core with an air-impermeable duct wall, offering structural support and lightweight design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If noise attenuating mufflers are used to reduce noise generated by moving air in environmental control system ducts, then noise absorption is improved, but weight increases
Solution Approach 1:
The patent combines the duct structure with noise attenuating functionality by integrating insulation layers and sound-absorbing material directly into the duct wall construction, eliminating the need for separate mufflers and reducing overall weight
Solution Approach 2:
The duct is designed to perform multiple functions simultaneously: transporting air, providing thermal insulation, and attenuating noise, thereby replacing what would traditionally require separate components including dedicated mufflers
2Object-affected harmful factors
If noise attenuating mufflers are used to reduce noise generated by moving air in environmental control system ducts, then noise absorption is improved, but volume increases
Solution Approach 1:
The noise attenuating functionality is merged into the duct wall structure itself through integrated insulation and sound-absorbing layers, eliminating the need for additional volume dedicated to separate muffler components
3Object-affected harmful factors
If noise attenuating mufflers are used to reduce noise generated by moving air in environmental control system ducts, then noise absorption is improved, but cost increases
Solution Approach 1:
By combining the duct and noise attenuation functions into a single integrated structure, the patent reduces the total number of components that need to be manufactured, assembled, and maintained, thereby reducing overall cost
Solution Approach 2:
The multi-functional duct design eliminates the need for separate noise attenuating devices, reducing component count and associated manufacturing and assembly costs
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 solution enables environmental control systems to be lighter, smaller, and less expensive, effectively meeting acoustic and thermal performance requirements while reducing weight and volume, thereby enhancing vehicle performance.
Implementation Method 1
ducts with a foam-filled honeycomb core structure that provides both sound absorption and thermal insulation
Implementation Method 2
foam-filled honeycomb core structure that provides both sound absorption and thermal insulation
Data Source
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AI summary
A duct includes a foam-filled honeycomb core structure having a tubular shape. The duct further includes an air-impermeable duct wall coupled to an exterior surface of the foam-filled honeycomb core structure.