Towed Glider Position Control on a Limit Sphere
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Solution Overview
Problem
Existing unpowered gliders face undesired termination of the air tow due to atmospheric turbulence or random events, leading to potential catastrophic loss of the glider or tug, which conventional autopilot systems fail to prevent.
Innovation Solution
An automated control system using onboard sensors and a controller to maintain the glider's position on a limit sphere relative to the tug, generating autopilot commands to adjust flight characteristics and avoid excessive loads, independent of specific autopilot types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional autopilot systems are used for glider control during air tow, then the system complexity remains low, but the reliability of preventing undesired termination of air tow deteriorates
Solution Approach 1:
The patent implements a feedback control system where sensors continuously monitor the glider's position relative to the tug, and the controller adjusts control surface commands based on the deviation from the desired limit sphere position. This closed-loop feedback mechanism enables the system to automatically correct position errors and maintain reliable air tow without requiring complex manual intervention.
Solution Approach 2:
The automated control system enables the glider to self-correct its position during air tow by autonomously processing sensor data and generating appropriate control commands. The system serves itself by independently detecting position deviations and executing corrective actions without external pilot input, thereby improving reliability while keeping the overall system architecture manageable.
2Stability of the object's composition
If automated control sequences are implemented to maintain glider position on limit sphere, then the stability of air tow improves, but the device complexity increases
Solution Approach 1:
The control system is segmented into distinct functional modules: sensor subsystem for position detection, controller for processing and decision-making, and interface for actuator control. This modular segmentation allows each component to be optimized independently, maintaining stability through specialized functions while managing overall system complexity through clear separation of concerns.
Solution Approach 2:
The controller is designed to perform multiple functions including position calculation, deviation detection, control sequence generation, and load management. By consolidating these diverse functions into a single multi-functional controller, the system achieves stable air tow control without proportionally increasing device complexity, as one component handles multiple critical tasks.
3Adaptability or versatility
If generic autopilot commands are used without specific glider or tug type adaptation, then the adaptability of the system improves, but the manufacturing precision of control sequences deteriorates
Solution Approach 1:
The system achieves adaptability by allowing parameter changes in the control sequences based on the specific glider and tug configuration. The controller can adjust parameters such as control surface deflection angles, response thresholds, and limit sphere dimensions to match the actual aircraft characteristics, thereby maintaining precision across different aircraft types without requiring completely different control systems.
Data Source
AI summary
An automated control system for a glider towed by a tug employs a sensor system (e.g., cameras mounted on at least one of the aircraft) to determine the relative position and velocity of the glider. A controller determines corrections to the flight characteristics of the glider in response to this data from the sensor system to maintain the glider on the surface of a limit sphere extending behind the tug with a predetermined radius based on the length of the tow cable. An interface to the flight controls of the glider maintains the desired flight characteristics of the glider provided by the controller.