Ejection Seat Roll Correction for Stable Divergence Trajectory
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current ejection seats experience rotational movement due to trajectory divergence rocket motors, which can cause injury to occupants and result in undesired ejection paths, especially with lighter-weight occupants.
Innovation Solution
A roll-stabilized ejection seat system incorporating a high energy catapult device, a trajectory divergence rocket motor, and an active roll correction rocket motor, controlled by an integral seat sequencer, to manage and correct rotational movements and ensure stable trajectory divergence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a trajectory divergence rocket motor is used to modify the ejection seat trajectory away from aircraft structures, then the ejection path is improved, but rotational movement is introduced that may cause injury or undesired path
Solution Approach 1:
The active roll correction rocket motor applies a counteracting rotational force in advance to prevent harmful roll movement caused by the trajectory divergence rocket motor. The correction motor is positioned to generate opposite rotational moment, neutralizing the adverse rotational effects before they can cause injury or undesired path deviation.
Solution Approach 2:
The active roll correction rocket motor acts as an intermediary component between the trajectory divergence rocket motor and the ejection seat. It mediates the rotational effects by introducing a counterbalancing force, allowing the trajectory modification to proceed while preventing harmful rotation from reaching the occupant.
2Adaptability or versatility
If the ejection seat is designed to handle lighter weight occupants, then adaptability is improved, but rotational movement from trajectory divergence rocket motor increases causing injury risk
Solution Approach 1:
The active roll correction rocket motor provides preliminary counteraction to rotational movement that would be more pronounced with lighter occupants. By applying corrective force proactively, the system prevents excessive rotation that would otherwise occur more readily with reduced occupant mass.
Solution Approach 2:
The active roll correction rocket motor generates a counterbalancing rotational force that acts as a dynamic counterweight to the unwanted rotation. This counter-force compensates for the reduced stabilizing effect of lighter occupant weight, maintaining control throughout the ejection trajectory.
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 effectively stabilizes the ejection seat's roll movement, reducing the risk of injury and ensuring a controlled ejection path by activating the active roll correction rocket motor in response to detected rotational thresholds, thereby enhancing safety and trajectory control.
Implementation Method 1
Current ejection seats utilize a high energy catapult device (sometimes referred to as a rocket-catapult assembly) to expel the ejection seat from an aircraft
Implementation Method 2
The trajectory divergence rocket motor may be attached to the seat bucket and may be configured to modify the trajectory of the ejection seat in response to a second actuation signal
Implementation Method 3
The active roll correction rocket motor may be attached to the seat bucket and may be configured to ameliorate a rotational movement of the ejection seat in response to a third actuation signal from the integral seat sequencer
Data Source
AI summary
A roll stabilization system for an aircraft ejection seat may be provided. An integral seat sequencer may activate an ejection sequence causing an aircraft ejection seat to be ejected from an aircraft. In various instances, particularly with lighter occupants of the aircraft ejection seat, the aircraft ejection seat may begin a rotational movement. To ameliorate this rotational movement, a roll correction rocket motor is installed on the aircraft ejection seat and selectively activated by the integral seat sequencer in the event that an undesired rotational movement is detected.