Rail-Mounted Hoist Stabilization for Slung Load Swinging
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Solution Overview
Problem
Conventional hoist systems for helicopters suffer from instability issues with slung loads, leading to significant swinging during flight, which complicates missions, increases time and cost, and may require flight cancellation due to safety concerns, despite relying on pilot skill and experience for stabilization.
Innovation Solution
A rail-mounted hoist system with a motor assembly and control system that measures load motion and dynamically adjusts the hoist position along a rail to attenuate swinging, integrating with existing aircraft components for minimal modification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a conventional hoist system is used to carry slung loads, then the system is simple and easy to implement, but the slung load experiences significant swinging and instability during flight
Solution Approach 1:
The patent implements a dynamic stabilization system where the hoist assembly can move along a rail mounted to the helicopter fuselage. The system uses sensors to detect slung load swing and automatically adjusts the hoist position in real-time to counteract swinging, transforming a static hoist system into a dynamic one that actively responds to load movements.
Solution Approach 2:
The stabilization system incorporates sensors that continuously monitor the position and motion of the slung load. This feedback is processed by a control system that automatically adjusts the hoist assembly position along the rail to counteract detected swinging, creating a closed-loop control system that actively maintains load stability.
2Productivity
If pilot skill and experience are relied upon to stabilize slung loads, then no additional system complexity is added, but mission time increases and safety concerns arise
Solution Approach 1:
The hoist system performs self-stabilization through automated sensors and control mechanisms that detect and counteract slung load swinging without requiring pilot intervention. The system serves itself by automatically adjusting the hoist position to maintain load stability, freeing the pilot to focus on flight operations.
Solution Approach 2:
The patent replaces the mechanical skill-based stabilization method (pilot manually adjusting helicopter position) with an automated sensor-based control system. The electronic control system uses sensors to detect load swing and automatically actuates the hoist assembly along the rail, substituting human mechanical skill with automated mechanical-electronic control.
3Stability of the object's composition
If the hoist system is made more complex to stabilize slung loads, then load stability improves, but the system requires more modifications to the aircraft
Solution Approach 1:
The rail system is designed to be mounted to the helicopter fuselage and can accommodate the hoist assembly at various positions along its length. This universal mounting approach allows the same rail structure to serve multiple stabilization scenarios without requiring custom modifications for each specific stabilization requirement, enhancing ease of manufacture and installation.
Data Source
AI summary
A hoist support system includes a rail assembly having a rail along which a motor assembly is translatable by actuation of a motor of the motor assembly. The motor assembly is adapted to support a hoist and is communicatively coupled to a control system. The control system is adapted to measure motion of a slung load coupled to the hoist and to determine whether and to what extent the slung load is swinging or otherwise unstable. In response to such measurements, the control system transmits control signals to the motor of the motor assembly to change the position of the motor assembly along the rail and attenuate the motion of the slung load.