Variable-thickness rotorcraft windshield for bird strike protection
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Solution Overview
Problem
Aircraft windshields, particularly those made of polycarbonate, are vulnerable to brittle failure during high-energy bird strikes, especially at the upper outboard corner, leading to potential catastrophic damage and reduced impact resistance, which necessitates thick and heavy designs to mitigate these risks, conflicting with the need for reduced weight and improved visibility.
Innovation Solution
A variable-thickness windshield design with non-uniform thickness zones, where critical areas receive thicker material for enhanced impact protection and thinner zones for weight reduction and improved optics, using techniques like thermoforming or injection molding with strategically placed clamping points to achieve specific thickness profiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the windshield thickness is increased to protect against bird strikes, then impact resistance is improved, but weight increases and visibility deteriorates
Solution Approach 1:
The windshield employs non-uniform thickness distribution with thicker regions at critical impact zones (upper outboard corners) and thinner regions at less critical areas. This local quality variation provides enhanced impact resistance where needed while reducing overall weight and improving optical clarity in pilot view areas.
2Strength
If the windshield thickness is increased to protect against bird strikes, then impact resistance is improved, but visibility deteriorates
Solution Approach 1:
The windshield employs non-uniform thickness distribution with thicker regions at critical impact zones (upper outboard corners) and thinner regions at less critical areas. This local quality variation provides enhanced impact resistance where needed while improving optical clarity in pilot view areas.
3Ease of manufacture
If the windshield is designed with uniform thickness for structural integrity, then manufacturing is simplified, but weight increases and impact protection is non-optimized
Solution Approach 1:
The windshield design varies the thickness parameter across different regions of the windshield rather than maintaining uniform thickness. This parameter change enables weight reduction and optimized impact protection while remaining manufacturable through techniques like thermoforming or injection molding with strategically placed clamping points.
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 variable-thickness design provides superior impact protection at critical areas while reducing weight and enhancing pilot visibility, achieving substantial weight savings and maintaining optical clarity without introducing optical distortions.
Implementation Method 1
Aircraft windshields, particularly those made of polycarbonate, are vulnerable to brittle failure during high-energy bird strikes
Implementation Method 2
using techniques like thermoforming or injection molding with strategically placed clamping points to achieve specific thickness profiles
Data Source
AI summary
According to one embodiment, a rotorcraft front windshield comprises an optically-transparent material having a non-uniform thickness profile such that the front windshield is a first thickness at a first position and a second thickness at a second position, the first thickness being different from the second thickness.