Electromagnetic Deactivation Device for Reserve Parachute Safety
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Solution Overview
Problem
Current automatic activation devices (AADs) for static line reserve parachutes do not address the hazards of untimely reserve parachute deployment in specific environmental conditions such as within an aircraft, towed jumper situations, and parachute entanglement, where manual deactivation of the ejector-spring is not feasible.
Innovation Solution
An electromagnetic automatic deactivation device (ADD) that compresses the ejector-spring using an electromagnet and permanent magnet combination, triggered by sound and sensor data to prevent reserve parachute deployment in hazardous conditions, and can act as an improvised AAD by automatically releasing the parachute if necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an automatic activation device (AAD) is implemented to deploy the reserve parachute, then the reliability of parachute deployment is improved, but the device cannot prevent hazardous deployment in certain conditions (within aircraft, towed jumper situations, parachute entanglement)
Solution Approach 1:
The ADD applies preliminary anti-action by using an electromagnet to compress and hold the ejector spring in a pre-loaded state before jump, preventing accidental deployment. The device actively maintains a restraining force on the spring until a safe deployment condition is detected through sensor inputs (barometric pressure, acceleration, GPS altitude), at which point the electromagnet releases to allow controlled spring expansion and parachute deployment.
Solution Approach 2:
The system implements feedback by continuously monitoring environmental conditions through multiple sensors (barometric pressure sensor, acceleration sensor, GPS altitude sensor) and using this information to control the electromagnet's activation state. The microcontroller processes sensor data to determine whether deployment conditions are safe, creating a closed-loop control system that adjusts the restraining force on the ejector spring based on real-time environmental feedback.
2Object-affected harmful factors
If the ejector-spring is compressed to prevent accidental deployment, then safety in hazardous conditions is improved, but the device complexity increases due to additional electromagnetic components and control systems
Solution Approach 1:
The ADD achieves multi-functionality by integrating multiple safety and control functions into a single device: the electromagnet serves both as a restraining mechanism for the ejector spring and as a controllable release mechanism; the sensor suite (barometric pressure, acceleration, GPS) provides both deployment condition monitoring and hazardous condition detection; the microcontroller handles both real-time sensor data processing and deployment decision-making. This consolidation reduces overall system complexity compared to having separate systems for each function.
Solution Approach 2:
The system implements self-service by automatically monitoring deployment conditions and controlling the electromagnet release without requiring manual intervention from the jumper. The microcontroller autonomously processes sensor inputs, determines safe deployment conditions, and triggers the electromagnet release sequence, making the system self-regulating and reducing the need for complex manual override mechanisms or additional control interfaces.
3Device complexity
If manual deactivation of the ejector-spring is required for safety, then device complexity is reduced, but the ease of operation deteriorates as jumpers must remember and execute specific deactivation procedures
Solution Approach 1:
The ADD implements self-service by automatically performing the deactivation/restraining function without requiring jumper intervention. The electromagnet is controlled by the microcontroller based on sensor inputs, automatically maintaining the ejector spring in a restrained state during hazardous conditions and releasing it when safe deployment conditions are detected. This eliminates the need for jumpers to remember or execute manual deactivation procedures, making the system self-regulating and operationally simple.
4Productivity
If the reserve parachute is automatically activated, then the productivity of emergency deployment is improved, but the loss of time occurs due to the activation sequence and sensor verification
Solution Approach 1:
The system applies preliminary action by pre-compressing the ejector spring and pre-positioning all deployment components before the jump occurs. The electromagnet is pre-configured to hold the spring in a ready state, and all sensors are pre-calibrated and operational. Upon detecting safe deployment conditions, the system immediately releases the electromagnet, allowing the pre-loaded spring to rapidly deploy the parachute without requiring time-consuming activation sequences or component assembly during the emergency response.
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 ADD effectively prevents injury by automatically deactivating the reserve parachute in hazardous conditions, ensuring safe jumper exit and landing by distinguishing between reserve-stop conditions and providing a secondary check for safe activation, enhancing jumper safety without requiring jumper intervention.
Implementation Method 1
An electromagnetic automatic deactivation device (ADD) that compresses the ejector-spring using an electromagnet and permanent magnet combination
Implementation Method 2
An electromagnetic automatic deactivation device (ADD) that compresses the ejector-spring using an electromagnet and permanent magnet combination
Data Source
AI summary
Disclosed are various embodiments for an electromagnetic automatic deactivation device (ADD). An ADD may be used with an ejector-spring static line reserve parachute, common in low-altitude military jumps. Activating a reserve parachute from within an aircraft, while being towed by an aircraft, or when trapped inside another parachute, can result in significant injury, and may be fatal. An ADD may be added to the internal packaging of a reserve parachute to prevent its accidental activation. An ADD may be configured to sense ambient pressure, linear and rotational motion, and other data, to identify hazardous environmental conditions. An ADD may be further configured to support a towed jumper whose static line is cut, by strategically deactivating the electromagnetic assembly, and therefore activating the reserve parachute. The ADD may be modified to include the ability to override the ADD with a secondary pull on the ripcord handle.