Foam Insulation Insert Sealing for Aircraft Water Ingress
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Solution Overview
Problem
Conventional attach points in aircraft insulation blankets are prone to water ingress, leading to undesirable conditions, and existing designs are cumbersome, difficult to modify, and do not provide complete sealing, which increases installation time and weight, reducing design flexibility and fuel efficiency.
Innovation Solution
An insulation sealing system comprising a hollow cylinder of closed cell foam with adhesive layers and a flange, used in conjunction with a stringer clip to create a water-tight seal through an interference fit, allowing for on-the-fly installation and design changes without pre-sealing penetration locations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional attach points are used to connect aircraft systems through insulation blankets, then aircraft systems can be mounted onto stringers, but water ingress occurs at the penetrations creating undesirable conditions
Solution Approach 1:
The sealing system is divided into multiple functional segments: the insulation insert provides primary sealing and structural support, the adhesive layer creates a water-tight bond between the insert and blanket, and the fastener secures the assembly to the stringer. This segmentation allows each component to specialize in preventing water ingress through its specific function.
Solution Approach 2:
The insulation insert acts as an intermediary element between the penetration hole and the external environment. It fills the penetration space and provides a surface for adhesive bonding, creating a water-tight barrier that prevents water from reaching the insulation blanket while allowing the aircraft system to connect to the stringer.
2Reliability
If pre-sealing penetration locations is done to prevent water ingress, then water-tight sealing is improved, but installation time increases and design flexibility decreases
Solution Approach 1:
The insulation insert is pre-formed with integrated adhesive surfaces and fastener holes, allowing it to be installed as a complete sealing unit rather than assembling multiple sealing components during installation. This preliminary preparation of the sealing element reduces on-site installation time while maintaining water-tight integrity.
Solution Approach 2:
The insulation insert is designed to be self-adhering to the insulation blanket through its integrated adhesive layer, eliminating the need for separate sealing materials or complex sealing procedures. The insert serves its own sealing function without requiring additional sealing components or steps.
3Reliability
If conventional sealing methods are used to seal penetrations, then water ingress is prevented, but the system becomes cumbersome and difficult to modify
Solution Approach 1:
The insulation insert combines multiple sealing functions into a single integrated component: it provides structural filling of the penetration, adhesive bonding surfaces for water-tight sealing, and mounting features for securing to the stringer. This merging eliminates the need for separate sealing components and simplifies the overall sealing system.
Solution Approach 2:
The insulation insert serves multiple functions simultaneously: it acts as a structural support element, a sealing barrier, an adhesive substrate, and a fastener mounting base. This multi-functionality reduces the number of components needed and simplifies installation while maintaining reliable water-tight sealing.
4Reliability
If additional sealing components are added to prevent water ingress, then water-tight sealing is improved, but aircraft weight increases reducing fuel efficiency
Solution Approach 1:
The adhesive sealing function is extracted from separate sealing materials and integrated directly into the insulation insert structure. This eliminates the need for additional sealing tapes, gaskets, or sealants that would add weight, while maintaining effective water-tight sealing through the bonded interface.
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 prevents water ingress, reduces installation complexity and time, and decreases aircraft weight, enhancing fuel efficiency and design flexibility while maintaining a water-tight seal.
Implementation Method 1
a first adhesive layer on a first face of the hollow cylinder, a flange of the closed cell foam extending from the hollow cylinder, and a second adhesive layer on a second face of the flange
Implementation Method 2
The stringer clip has a mounting post configured to provide an interference fit with a hole of the hollow cylinder
Implementation Method 3
a hollow cylinder formed of a closed cell foam
Data Source
AI summary
An insulation insert comprises a hollow cylinder formed of a closed cell foam, a first adhesive layer on a first face of the hollow cylinder, a flange of the closed cell foam extending from the hollow cylinder, and a second adhesive layer on a second face of the flange.