Ejection Seat Time Delay Control for Canopy Clearance
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Solution Overview
Problem
Traditional ejection systems often result in severe or fatal injuries due to unintended occupant contact with the aircraft canopy, as the canopy may fail to clear the ejection seat escape envelope prior to egress, particularly at high airspeeds and varying aircraft orientations.
Innovation Solution
A control system for ejection systems that includes a sensor, a controller, and a tangible memory to determine a time delay based on sensor data such as airspeed, altitude, and aircraft orientation, allowing for precise timing of canopy jettison and ejection seat actuation to prevent occupant contact, utilizing a lookup table for canopy jettison system operation times and enabling pyrotechnic communication with a pyrotechnic time delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional ejection systems are used without time delay control, then the ejection system is simple and fast to operate, but the canopy may fail to clear the ejection seat escape envelope prior to egress causing severe or fatal injury to occupants
Solution Approach 1:
The system performs preliminary actions by automatically sequencing the canopy jettison and ejection seat actuation with a calculated time delay before the actual ejection occurs. The controller determines the optimal time delay based on sensor data (airspeed, altitude, orientation) and executes the canopy separation first, then waits for the calculated delay period before actuating the ejection seat, ensuring the canopy clears the escape envelope in advance
Solution Approach 2:
The system dynamically adjusts the time delay between canopy jettison and ejection seat actuation based on real-time aircraft conditions. The controller continuously monitors sensor data including airspeed, altitude, and aircraft orientation, and uses this information to calculate and adjust the optimal time delay, making the system adaptive to varying flight regimes rather than using a fixed delay
2Adaptability or versatility
If a fixed time delay is used for canopy jettison and ejection seat actuation, then the system operation is simple, but it cannot adapt to varying aircraft speed regimes and orientations
Solution Approach 1:
The system implements feedback by continuously monitoring aircraft parameters (airspeed, altitude, orientation) through sensors and using this information to adjust the time delay calculation. The controller receives real-time data from sensors, processes it through the time delay logic, and adjusts the sequencing timing accordingly, creating a closed-loop control system that adapts to changing flight conditions
Solution Approach 2:
The system changes the time delay parameter dynamically based on aircraft operating conditions. Instead of using a fixed time delay, the controller calculates different delay values based on sensor inputs such as airspeed, altitude, and aircraft orientation, adjusting the timing parameter to optimize canopy clearance for each specific flight regime
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 ensures the canopy clears the ejection seat escape envelope before occupant egress, reducing the risk of injury by providing a controlled time delay between canopy separation and ejection seat actuation, thereby enhancing safety across various aircraft regimes.
Implementation Method 1
the sensor comprises a pitot tube
Implementation Method 2
enabling pyrotechnic communication with a pyrotechnic time delay
Data Source
AI summary
A control system for an ejection system may comprise an ejection seat, a canopy jettison system, a sensor, a controller, and a tangible, non-transitory memory configured to communicate with the controller, the tangible, non-transitory memory having instructions stored thereon that, in response to execution by the controller, cause the controller to perform operations comprising receiving an eject command, polling the sensor for a sensor data, receiving the sensor data, passing the sensor data to a time delay logic, determining via the time delay logic a time delay based on the sensor data, and actuating the ejection seat based on the time delay.