Gravity-Adjusted Aircraft Emergency Light Assembly
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Solution Overview
Problem
Existing external aircraft lighting systems fail to adequately illuminate evacuation slides during night evacuations due to limited visibility caused by varying slide angles and terrain conditions, leading to hesitation and slowed evacuation processes.
Innovation Solution
A light assembly for aircraft evacuation systems that includes a rotatable portion configured to passively adjust its light beam direction based on gravity, ensuring consistent illumination of the evacuation path regardless of the aircraft's tilt or deployment angle, using a combination of casings with rotational freedom and a weighted portion to self-position the light source for optimal beam direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed lighting is used on the aircraft, then the lighting structure is simple, but the illumination cannot adapt to varying slide angles and terrain conditions
Solution Approach 1:
The lighting system transitions from a fixed structure to a dynamic one where the light source can rotate and reposition itself. The rotatable portion with weighted portion allows the light beam to automatically adjust its angle relative to the slide, adapting to different deployment configurations and terrain conditions while maintaining effective illumination.
Solution Approach 2:
The light assembly incorporates a weighted portion that enables automatic self-positioning of the light beam without external control. The gravity-based mechanism allows the lighting system to self-adjust to the correct illumination angle based on the slide's deployment angle, eliminating the need for complex active control systems.
2Illumination intensity
If lights are affixed to the slide, then slide visibility is improved, but the lighting does not account for varying slide angles
Solution Approach 1:
Instead of fixed lighting on the slide, the system uses a dynamic mounting on the aircraft that allows the light source to rotate. This ensures the light beam maintains a consistent angle relative to the slide surface regardless of how the slide deploys, providing uniform illumination across all operating conditions.
Solution Approach 2:
The weighted portion acts as a counterbalance that automatically positions the light source to compensate for varying slide angles. As the slide deployment angle changes, gravity causes the weighted mechanism to rotate the light source to the appropriate angle, maintaining consistent illumination on the slide surface.
3Ease of operation
If the light beam direction is fixed relative to the aircraft, then the lighting system is simple, but the evacuation path may not be adequately illuminated during night evacuations
Solution Approach 1:
The lighting system uses a gravity-based automatic positioning mechanism that requires no external power or control systems. The weighted portion naturally orients the light beam to follow the slide's angle, ensuring the evacuation path is always illuminated without requiring complex sensors, motors, or control electronics.
Solution Approach 2:
The patent replaces complex active mechanical control systems with a passive gravity-based positioning mechanism. Instead of using motors, sensors, and control circuits to adjust the light beam angle, the system uses the simple yet effective weighted portion that automatically orients the light source based on gravitational force.
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 consistent and effective illumination of the evacuation path, enhancing visibility and safety by maintaining a constant beam direction and angle relative to the vertical, thereby reducing hesitation and improving evacuation efficiency.
Implementation Method 1
a rotatable portion configured to passively adjust its light beam direction based on gravity
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
A light assembly for an aircraft evacuation system may comprise a first casing (100) including a weighted portion. A light source (104) may be disposed within the first casing. A second casing (102) may be coupled to the first casing by a bearing. The first casing may be configured to rotate with respect to the second casing about an axis. A center of mass of the first casing may be offset from the axis.