Over-Frame Blanket Assembly Repair for Aircraft Sound Deadening

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Solution Overview

Problem

Conventional sound-deadening blankets in aircraft fuselages require frequent access for maintenance, which involves cutting and re-taping, leading to increased sound transmission and reduced effectiveness over time.

Innovation Solution

An over-frame blanket assembly with a sound barrier layer exposed on the outer surface, allowing for easier visual inspection and repair, featuring a sound barrier layer and a sound absorbing layer, and incorporating releasable sound absorbers and retaining assemblies for secure installation and maintenance access.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the sound-deadening blanket is cut to access components, then access to electronic components and wires is enabled, but sound transmission increases and effectiveness deteriorates

Engineering Contradiction:

ImproveAccess to componentsVSAvoidSound deadening effectiveness

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The blanket is divided into modular sections with predefined access points that can be independently opened without compromising the integrity of the remaining sound-deadening structure. This allows component access while maintaining overall sound isolation effectiveness.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Access points incorporate intermediary structures such as removable panels or flaps that allow component access without requiring cuts through the sound-deadening material. These intermediaries maintain the acoustic barrier when closed and provide access when opened.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of manufacture

If the blanket is taped back together after cutting, then the blanket structure is restored, but sound transmission remains increased compared to uncut blanket

Engineering Contradiction:

ImproveRepair processVSAvoidSound transmission performance

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The blanket is pre-configured with access points that include pre-applied adhesives or sealing mechanisms. When components need access, pre-cut flaps or panels are removed; when repair is needed, these pre-prepared sealing mechanisms are reactivated without requiring additional taping operations, thus restoring original sound transmission properties.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

Access points use disposable or replaceable sealing elements that can be easily replaced rather than repaired. These pre-fabricated sealing components maintain acoustic integrity when installed and can be quickly replaced if damaged, avoiding the need for complex repair processes that compromise performance.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Reliability

If conventional three-layer blanket is used, then sound absorption is provided, but visual inspection and repair difficulty increase

Engineering Contradiction:

ImproveSound absorption performanceVSAvoidVisual inspection ease

Core Design Contradiction:

ReliabilityVSEase of repair

Solution Approach 1:

The blanket structure uses asymmetric layering where the sound-absorbing material is positioned non-uniformly or with varying densities in different regions. This asymmetric configuration maintains acoustic performance while creating visual or tactile differences that facilitate inspection and identification of problem areas without requiring complete disassembly.

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

Different layers or regions of the blanket use materials with distinct visual characteristics such as color variations or reflective properties. This allows for easy visual inspection of the blanket's condition, layer integrity, and potential damage without removing the blanket from the fuselage structure.

Inventive Principle:

Principle #32Color changes

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

Enhances sound deadening performance by simplifying assembly and repair processes, reducing sound transmission, and maintaining effectiveness throughout the aircraft's lifespan.

Implementation Method 1

a first sound barrier layer that defines a first outer surface of the over-frame blanket assembly

Methodology Applied

Scientific EffectSound reflection: Reflection

Implementation Method 2

The sound absorbing layers absorb sound compression waves that bounce between the sound barrier layer and the fuselage and between the sound barrier layer and the cabin interior

Methodology Applied

Scientific EffectSound absorption: Acoustic Absorption

Data Source

PatentUS11433987B2Repair of over-frame blanket assemblies in aircraft

Publication Date: 2022.09.06 GULFSTREAM AEROSPACE CORP

AI summary

A method of repairing an over-frame blanket assembly in an aircraft includes identifying an aperture in an over-frame blanket piece having an exposed sound barrier layer. The method further includes cutting an acoustic barrier patch to a size that is larger than the aperture. The method includes adhering a sound barrier layer of the acoustic barrier patch to the exposed sound barrier layer of the over-frame blanket piece around the aperture to cover the aperture.