Aircraft Window Seal Migration Prevention
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Solution Overview
Problem
Aircraft window seals tend to migrate away from their intended positions due to cyclic pressure loads, vibrations, and external hydrodynamic forces, leading to pressure leaks and condensation, with traditional solutions being weight-inefficient.
Innovation Solution
A window assembly featuring a geometrically reconfigured outer pane and a seal assembly with an integral stiffening ring and clamping ring to physically restrain the seal, preventing movement and migration, while maintaining a weight-efficient design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the edge of the window seal is made thicker to prevent seal migration, then the seal retention reliability is improved, but the weight of the window assembly increases
Solution Approach 1:
The window seal is segmented into two distinct functional portions: a first portion (thickness t1) that maintains the window cavity, and a second portion (thickness t2) that is restrained by the window frame. This segmentation allows each portion to be optimized for its specific function without requiring the entire seal to be thick, thereby preventing migration while controlling weight.
Solution Approach 2:
Different portions of the window seal have different thicknesses tailored to their local requirements. The first portion has thickness t1 for cavity maintenance, while the second portion has thickness t2 for structural restraint. This local differentiation ensures that material is used efficiently only where needed, avoiding unnecessary weight increase while maintaining seal retention reliability.
2Strength
If the seal is made thicker to prevent migration under cyclic pressure loads, then the resistance to pressure loads is improved, but the weight efficiency deteriorates
Solution Approach 1:
The seal is divided into portions with different thicknesses (t1 and t2) that are strategically positioned to handle different aspects of the loading. The restrained second portion provides the necessary strength against cyclic pressure loads and vibrations, while the first portion maintains the cavity without adding excessive weight, achieving strength improvement without proportional weight increase.
Solution Approach 2:
The window frame structure acts as an intermediary that restrains the second portion of the seal. This intermediary restraint mechanism allows the seal to resist cyclic pressure loads and vibrations effectively without requiring the entire seal to be uniformly thick, thereby improving strength while maintaining weight efficiency.
3Reliability
If traditional seal retention methods are used, then seal migration prevention is achieved, but weight efficiency is reduced
Solution Approach 1:
By segmenting the seal into portions with different thicknesses and functions, the invention achieves reliable seal position stability through the restrained second portion while the first portion maintains the cavity. This segmented approach provides effective migration prevention without the weight penalty of a uniformly thick seal.
Solution Approach 2:
The local quality principle is applied by giving different thicknesses (t1 and t2) to different portions of the seal based on their specific functional requirements. This ensures that the seal maintains stable position where needed (second portion restrained by frame) without unnecessarily increasing weight across the entire seal structure.
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
A window assembly (200) is provided to prevent the migration of the window seal (206). The window assembly includes an outer window pane (202), an inner window pane (204) and a seal (208). The window assembly includes a stiffening ring (210) and a clamping ring (212) which act to secure the window seal in the desired position.