Flywheel Hoist Stabilization for Spinning Litter Retrieval
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Solution Overview
Problem
Existing methods for stabilizing hoisted objects during helicopter operations, such as tag lines and active fins, are inadequate as they require manual intervention and are prone to failure in certain environments, particularly during aeromedical evacuations.
Innovation Solution
A device equipped with a stability manager that includes an inertial-measurement unit, motors, and flywheels, which uses control-feedback algorithms to counteract the spin of a hoisted object by matching its angular velocity, thereby stabilizing it without the need for manual intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If tag lines are used to stabilize hoisted objects, then simplicity is improved, but manual intervention requirement worsens
Solution Approach 1:
The stabilization device is equipped with an inertial-measurement unit, motors, and flywheels that automatically detect and counteract spinning without requiring manual intervention. The system self-regulates by sensing angular velocity and adjusting flywheel orientation accordingly, eliminating the need for personnel to manually handle tag lines.
2Stability of the object's composition
If active fins are used to stabilize hoisted objects, then stabilization capability is improved, but reliability worsens
Solution Approach 1:
The patent replaces the mechanical active fin system with a flywheel-based stabilization mechanism. The flywheel system uses conservation of angular momentum to counteract spinning, which is more reliable as it has fewer moving parts that can fail and doesn't protrude from the airframe like active fins do.
3Stability of the object's composition
If active fins protrude from the airframe, then stabilization capability is improved, but safety worsens
Solution Approach 1:
Instead of protruding outward like active fins, the stabilization device is contained within the airframe structure. The flywheels are mounted inside the airframe and adjust their orientation to provide stabilization, eliminating the risk of protruding parts falling to the ground while maintaining the stabilization function.
4Device complexity
If manual stabilization methods are used, then device complexity is reduced, but productivity worsens
Solution Approach 1:
The stabilization device incorporates an inertial-measurement unit that continuously monitors angular velocity and provides feedback to the control system. This feedback loop enables automatic real-time adjustments of the flywheels, eliminating the need for manual monitoring and intervention, thereby improving operational efficiency without excessive complexity.
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 device effectively stabilizes hoisted objects by transferring angular momentum from the object to the flywheel, reducing the need for manual stabilization and improving safety in various environments.
Implementation Method 1
The device effectively stabilizes hoisted objects by transferring angular momentum from the object to the flywheel
Data Source
AI summary
Disclosed are various embodiments for stabilizing a hoisted object. A hoisted object such as a litter can have a tendency spin while being retrieved on a lift line. A device may be connected to the hoisted object to reduce a spin or other angular velocity of the hoisted object. The device may monitor stability of the hoisted object and determine that the hoisted object is unstable. The device may be configured to rotate at least one flywheel to apply torque to an enclosure of the device.