Polyimide Aerogel Panel Assembly for Lightweight Thermal Insulation
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Solution Overview
Problem
Current thermal insulation methods for aircraft panels, such as honeycomb core panels, are inadequate in providing lightweight, low thermal conductivity, and high compressive strength, necessitating a more effective insulation material like polyimide aerogel to reduce the need for active chilling/heating systems for food and drinks.
Innovation Solution
Incorporating polyimide aerogel into honeycomb core panel assemblies by applying a sol-gel mixture and supercritically drying it to create a lightweight, thermally insulated panel assembly with polyimide aerogel layers between the core and laminate skins, and bonding the aerogel using resin or adhesive agents for enhanced structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional thermal insulation materials are used in honeycomb core panels, then the panel provides basic insulation, but the thermal conductivity is too high and weight is excessive
Solution Approach 1:
The patent applies porous materials by incorporating polyimide aerogel beads into the honeycomb core panel structure. The aerogel beads create a porous, lightweight insulation layer that significantly reduces thermal conductivity while maintaining low weight, directly resolving the contradiction between thermal insulation performance and panel weight
Solution Approach 2:
The patent uses composite materials by combining polyimide aerogel beads with honeycomb core structure and laminate skins to create a multi-material panel assembly. This composite approach achieves superior thermal insulation properties while keeping the overall panel weight low, addressing both the thermal conductivity and weight concerns
2Loss of energy
If polyimide aerogel is incorporated into the panel, then thermal insulation improves, but the manufacturing process complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-forming polyimide aerogel beads through sol-gel processing and supercritical drying before incorporation into the panel. This pre-preparation of insulation material simplifies the overall manufacturing process, as the aerogel beads can be directly inserted into the honeycomb core without requiring complex in-situ formation processes
Solution Approach 2:
The patent uses an intermediary approach by employing a sol-gel mixture as a precursor that transforms into polyimide aerogel through controlled chemical reactions and supercritical drying. This intermediary process enables the formation of complex aerogel structures through relatively simple, controllable steps that can be integrated into existing manufacturing workflows
3Loss of energy
If aerogel is used for insulation, then thermal efficiency improves, but the compressive strength requirement must be maintained
Solution Approach 1:
The patent applies composite materials by combining polyimide aerogel beads with the structurally strong honeycomb core and laminate skins. The aerogel provides thermal insulation while the honeycomb structure and outer skins provide mechanical strength, creating a composite panel that simultaneously achieves both thermal efficiency and compressive strength requirements
Solution Approach 2:
The patent applies local quality by placing polyimide aerogel beads specifically in the core insulation regions where thermal protection is needed, while maintaining the structurally critical honeycomb framework and laminate skins in load-bearing positions. This localized material assignment optimizes both thermal insulation performance and compressive strength
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 provides improved thermal insulation, reducing the need for active chilling/heating systems and enhancing the structural integrity of aircraft panels, thereby improving the efficiency and reliability of thermal management in aircraft environments.
Implementation Method 1
applying a polyimide aerogel producing mixture to one or more cells of the honeycomb core; and supercritically drying the mixture to produce a layer of polyimide aerogel on the one or more cells of the honeycomb core
Data Source
AI summary
A panel assembly that includes a core having first and second opposing major surfaces, a first laminate skin secured to the first major surface of the core, a second laminate skin secured to the second major surface of the core, and at least a first layer of polyimide aerogel incorporated into one of the first laminate skin or the second laminate skin.