Long-Line Loiter Control for Load Position and Yo-Yo Suppression
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Solution Overview
Problem
The long line loiter maneuver suffers from variability in response time between changes in the aircraft's flight path and velocity and response by the load, leading to issues like 'yo-yo' effects, high acceleration, and imprecise fine position and elevation control of the load.
Innovation Solution
A long line loiter control system that includes physical components like a carrier, hoist, long line, and suspended load control system (SLCS), along with logical components such as operational modules and data fusion modules, to predict and react to the states of these components, thereby enhancing control of the load during the maneuver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a long line is used to suspend a load during a loiter maneuver, then the load can be transported to distant target locations, but the response time between aircraft maneuvers and load response becomes highly variable (30 seconds to several minutes)
Solution Approach 1:
The system continuously monitors the state of the long line and load using sensors (accelerometers, GPS, cameras) and adjusts aircraft maneuvers in real-time based on feedback about load position and motion, reducing response time variability by actively compensating for the long line's inertial delays
Solution Approach 2:
The system dynamically adjusts aircraft flight parameters (speed, altitude, turn rate) based on real-time conditions and load state, allowing the aircraft to adapt its maneuvers to minimize response time variability while maintaining safe operation with the extended long line
2Length of moving object
If the long line is sufficiently long to reach distant targets, then the bottom of the long line spiral can be centered on the target location, but the load is subject to yo-yo effects and high acceleration
Solution Approach 1:
The system applies preliminary counter-actions by predicting upcoming yo-yo effects and high acceleration events based on aircraft maneuver data and long line physics models, then preemptively adjusts aircraft flight parameters to counteract these harmful effects before they fully develop
Solution Approach 2:
The system uses soft-capture algorithms and controlled damping maneuvers to cushion the load against sudden acceleration changes and yo-yo effects, gradually dissipating energy through controlled aircraft movements rather than abrupt corrections
3Speed
If the aircraft circles the target location to maintain position, then the load can be positioned at distant targets, but fine position and elevation control of the load becomes difficult
Solution Approach 1:
The system uses continuous feedback from sensors monitoring load position, long line tension, and aircraft state to make precise adjustments to aircraft flight parameters, enabling fine position and elevation control of the load despite the inherent imprecision of long line suspension
Solution Approach 2:
The system changes multiple flight parameters (altitude, speed, bank angle) in coordinated ways to achieve fine position control of the load, using small parameter adjustments to make precise positional corrections without causing large load movements
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 control of the load by predicting and responding to hazardous states, reducing variability in response time, and minimizing undesirable motions like 'yo-yo' effects and high acceleration, thereby enhancing the safety and precision of the long line loiter maneuver.
Implementation Method 1
Gravitational forces on the long line pull it downward
Implementation Method 2
aerodynamic forces on the long line reduce if the long line moves toward the target location
Data Source
AI summary
Physical and logical components of a long line loiter control system address control of a long line loiter maneuver conducted beneath a carrier, such as a fixed-wing aircraft. Control may comprise identifying, predicting, and reacting to estimated states and predicted states of the carrier, a suspended load control system, and a long line. Identifying, predicting, and reacting to estimated states and predicted states may comprise determining characteristics of state conditions over time as well as response time between state conditions. Reacting may comprise controlling a hoist of the carrier, controlling thrusters of the suspended load control system, and or controlling or issuing flight control instructions to the carrier so as not to increase the response time and or to avoid a hazard.