Compliant Aircraft Panel for Bird Strike Protection
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Solution Overview
Problem
Conventional aircraft forward pressure bulkheads and crown panels are heavy, costly, and complex due to their rigid structure, which increases weight and manufacturing complexity, and they require a large parts count to resist bird strikes and hail impacts effectively.
Innovation Solution
A compliant panel design featuring a deformable monolithic skin that absorbs impact energy through deformation, eliminating the need for rigid reinforcement members and using selectively thickened areas to manage different impact forces, formed from materials like aluminum or composite materials, reducing the number of parts and weight compared to traditional designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional rigid reinforcement beams and ribs are used to resist bird strikes and hail impacts, then protection effectiveness is improved, but weight increases and manufacturing complexity increases
Solution Approach 1:
The patent applies a compliant panel design that uses flexible, deformable structures instead of rigid reinforcement beams and ribs. The panel is engineered to deform controllably under impact loads, absorbing energy through deformation rather than resisting through rigid support structures. This eliminates the need for heavy internal reinforcement while maintaining protection effectiveness against bird strikes and hail impacts.
Solution Approach 2:
The patent changes the structural parameters from rigid to compliant, allowing the panel to transition from a rigid resistance mode to a deformable energy absorption mode. The panel's material properties and geometric configuration are optimized to enable controlled deformation that absorbs impact energy, replacing the traditional rigid reinforcement approach with a compliant structure that achieves the same protective function with reduced weight.
2Reliability
If conventional rigid reinforcement beams and ribs are used to resist bird strikes and hail impacts, then protection effectiveness is improved, but device complexity increases
Solution Approach 1:
The patent merges the functions of the panel skin and reinforcement structures into a single integrated compliant panel assembly. Instead of separately manufacturing and assembling rigid beams, ribs, and panel sections, the invention uses a unified deformable structure that performs both protective and structural functions. This integration significantly reduces the parts count and simplifies manufacturing processes while maintaining protection effectiveness.
Solution Approach 2:
The compliant panel design replaces complex rigid reinforcement structures with a simpler flexible shell configuration. The deformable panel achieves protection through its ability to deform and absorb energy, eliminating the need for multiple rigid components and their associated connections, fasteners, and assembly procedures, thereby reducing device complexity.
3Weight of moving object
If a monolithic deformable skin is used to absorb impact energy, then weight is reduced and manufacturing is simplified, but protection effectiveness against high-speed impacts may be compromised
Solution Approach 1:
The patent applies local quality by creating variable thickness regions within the monolithic panel. The panel includes thicker reinforcement zones at critical locations such as edges, corners, and areas susceptible to high-speed impacts, while maintaining thinner sections in less critical areas. This localized thickness variation optimizes the balance between weight reduction and protection effectiveness, allowing the panel to absorb energy through deformation while providing enhanced resistance where needed.
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 compliant panel design reduces weight by 27-36 kg (60-80 pounds) and simplifies construction while effectively absorbing and dissipating impact energy, providing protection against bird strikes and hail without the need for traditional 'brick wall' rigid structures, thus lowering material and manufacturing costs.
Implementation Method 1
a deformable monolithic skin that absorbs impact energy through deformation
Implementation Method 2
absorbing and dissipating impact energy
Data Source
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AI summary
An aircraft forward pressure bulkhead as described herein includes a malleable and deformable dome that is configured to "catch" foreign objects, such as birds. The dome is intentionally designed to deform in response to a foreign object strike that imparts at least a threshold amount of impact energy to the bulkhead. The dome is free of rigid stiffeners and non-deformable reinforcement members that would otherwise hinder the flexible characteristic of the dome. Practical embodiments of the bulkhead utilize fewer parts, are less heavy, and are less expensive than traditional bulkheads that utilize rigid stiffeners.