Ejection Seat Acceleration Scalar Timing Control
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Solution Overview
Problem
Ejection seat systems face challenges in ensuring safe ejection of aircrew from aircraft due to varying crew sizes, leading to potential injuries from mismatched acceleration levels, as smaller crew members experience higher accelerations and larger crew members may not clear the aircraft or terrain effectively.
Innovation Solution
An ejection seat system that uses an accelerometer and controller to calculate the change in velocity and adjust the ejection sequence timing based on a scalar value, categorizing aircrew size as small, medium, or large to optimize parachute deployment and clearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed ejection sequence timing is used for all crew sizes, then the ejection system is simple to operate, but smaller crew members experience higher accelerations leading to potential injuries
Solution Approach 1:
The ejection sequence timing is made dynamic by continuously monitoring acceleration data from accelerometers and adjusting the timing parameters in real-time based on the actual acceleration profile experienced by the crew member. This allows the system to adapt to different crew sizes and masses, preventing excessive acceleration forces on smaller crew members while maintaining effectiveness for larger crew members.
Solution Approach 2:
The system incorporates feedback loops where acceleration data from multiple accelerometers is continuously fed back to the control unit. The control unit processes this data and adjusts the ejection sequence timing accordingly, creating a closed-loop control system that optimizes safety for varying crew sizes without requiring manual input from the crew member.
2Device complexity
If a fixed ejection sequence timing is used for all crew sizes, then the system complexity is reduced, but larger crew members may not clear the aircraft or terrain effectively
Solution Approach 1:
The ejection sequence timing parameters are dynamically adjusted based on real-time acceleration profiling. The system continuously monitors the acceleration profile and modifies the timing of ejection events to ensure adequate clearance speed for larger crew members while preventing excessive acceleration for smaller crew members.
Solution Approach 2:
Acceleration feedback from sensors is used to continuously optimize the ejection sequence timing. The control unit processes acceleration data and adjusts timing parameters to ensure that larger crew members achieve sufficient clearance speed from both aircraft and terrain, while maintaining safety for smaller crew members.
3Reliability
If acceleration-based timing adjustment is implemented, then safety for varying crew sizes is improved, but the device complexity increases
Solution Approach 1:
The system performs self-characterization by automatically profiling the acceleration characteristics of each crew member during the ejection sequence. The control unit autonomously processes acceleration data from multiple sensors and adjusts timing parameters without requiring manual input, crew member classification, or pre-programming, thereby improving safety while minimizing the operational complexity burden on the crew member.
4Object-affected harmful factors
If real-time acceleration monitoring is used, then injury prevention for smaller crew members is improved, but the measurement and control difficulty increases
Solution Approach 1:
Multiple accelerometers provide continuous acceleration feedback that is processed by the control unit. This feedback mechanism enables real-time detection and measurement of acceleration forces, allowing the system to identify when acceleration levels become hazardous for smaller crew members and adjust timing parameters accordingly to prevent injury.
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 system improves aircrew safety by tailoring the ejection sequence to the aircrew size, reducing injury risk for smaller crew members and ensuring terrain clearance for larger ones by adjusting the timing of parachute deployment.
Implementation Method 1
receiving, by a processor, a first acceleration data from an accelerometer
Implementation Method 2
The catapult stage fires first, ejecting the ejection seat and any occupant of the ejection seat from the aircraft cockpit
Implementation Method 3
The rocket stage then ignites and propels the ejection seat and its occupant to a separation distance from the aircraft and terrain
Implementation Method 4
The main parachute is then deployed and the ejection seat and occupant are decelerated to a safe velocity for recovery
Data Source
AI summary
A method is disclosed herein. The method includes receiving, by a processor, a first acceleration data from an accelerometer, calculating, by the processor, a change in velocity based on the first acceleration data, the change in velocity being calculated over a first period of time, and adjusting, by the processor, a timing sequence based on the change in velocity.