Solid-State Payload Coupling for UAV Winch Systems
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Solution Overview
Problem
Existing unmanned aerial vehicle (UAV) systems face challenges in efficiently and reliably delivering payloads without the need for landing, particularly in scenarios where infrastructure is limited or absent, and require complex mechanisms that can fail due to moving parts.
Innovation Solution
A winch-based payload delivery system with a solid-state payload coupling apparatus that uses a tether and a payload coupling mechanism with cams and a weighted design to securely attach and release payloads without moving parts, allowing for hovering delivery and retrieval without the need for landing infrastructure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a motorized winch system with moving parts is used for payload delivery, then the payload can be delivered without landing, but the system complexity increases and reliability decreases due to potential mechanical failures
Solution Approach 1:
The patent removes the motorized winch and other active mechanical components from the payload delivery system. Instead, it uses a passive solid-state coupling apparatus that relies on gravity and simple mechanical engagement/disengagement mechanisms. This extraction of complex moving parts directly addresses the reliability concern while maintaining payload delivery capability through alternative means.
Solution Approach 2:
The patent replaces the motorized mechanical winch system with a solid-state coupling mechanism that uses cam-based engagement and gravity-assisted release. This substitution eliminates motors, gears, and other prone-to-failure components, directly resolving the contradiction between delivery capability and system reliability.
2Adaptability or versatility
If a motorized winch system with moving parts is used for payload delivery, then the payload can be delivered without landing, but the device complexity increases
Solution Approach 1:
The patent extracts and removes the motorized winch system entirely, replacing it with a passive solid-state coupling apparatus. This dramatically reduces device complexity by eliminating motors, control electronics, and complex mechanical transmission components while maintaining the essential payload delivery function through simpler gravity-based mechanisms.
Solution Approach 2:
The patent substitutes complex motorized mechanical systems with a solid-state cam-based coupling mechanism. This replacement reduces device complexity by using passive mechanical elements that engage and disengage through simple geometric interactions rather than active control systems.
3Reliability
If a solid-state payload coupling apparatus is used, then the system reliability improves and complexity reduces, but the payload must be released through alternative mechanisms
Solution Approach 1:
The patent designs the solid-state coupling apparatus to automatically engage and disengage payloads through gravity-assisted mechanisms. The cam-based coupling automatically locks during ascent and automatically releases during descent without requiring active control inputs, making the system self-servicing and simplifying operation despite the solid-state design.
Solution Approach 2:
The patent uses gravity as a counterbalancing force to automatically release the payload. The solid-state coupling apparatus is designed so that gravitational force during descent naturally disengages the cam-based locking mechanism, providing an automatic release function that simplifies operation while maintaining high reliability.
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
Enables reliable and efficient payload delivery and retrieval without landing, reducing complexity and potential failures from moving parts, while allowing for high-speed flight and flexible payload geometry, and eliminating the need for landing infrastructure.
Implementation Method 1
a motor coupled to the drum to apply a torque thereto
Implementation Method 2
a weighted design to securely attach and release payloads
Data Source
Figure 1A
Figure 1B~1C
Figure 1D
AI summary
Described herein are methods and systems for detecting and correcting errors when picking up and lowering a payload coupled to a tether of a winch system arranged on an unmanned aerial vehicle (UAV). For example, the winch system may include a motor for winding and unwinding the tether from a spool, and the UAV's control system may control the motor to lower the tether and monitor an electric current supplied to the motor to determine whether a payload has detached from the tether. This process of lowering the tether and monitoring the motor current may be repeated up to a predetermined number of times, at which point the control system may operate the motor to detach the tether from the spool, leaving both the tether and the payload behind.