UAV Package Tether Stabilization for Sway-Controlled Delivery
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Solution Overview
Problem
Unmanned aerial vehicles (UAVs) face challenges in delivering packages efficiently due to sway or swing during descent, which can result in packages being delivered outside intended areas or contacting obstacles, especially when sudden gusts of wind occur.
Innovation Solution
The implementation of various methods and systems, including winch mechanisms, tether wrapping techniques, and rip-strip mechanisms, to modulate the descent of packages and mitigate sway by converting sideways potential energy into downward kinetic energy, using sensors for active stabilization and passive systems to ensure precise delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a package is dropped from a UAV to the ground, then delivery speed is improved, but package sway or swing increases causing delivery outside intended areas
Solution Approach 1:
The patent applies dynamics by modulating the descent rate of the package during its fall from the UAV. The system actively adjusts the descent rate to compensate for sway and swing, transforming a static drop into a dynamically controlled descent process that maintains precision while enabling air delivery
Solution Approach 2:
The patent implements feedback control by monitoring package sway or swing during descent and using this information to adjust the descent rate. Sensors detect package position and the system responds by modulating the descent rate to counteract sway, creating a closed-loop control system that maintains delivery precision
2Manufacturing precision
If the descent rate of a package is increased to mitigate sway, then delivery precision is improved, but the package may contact obstacles during descent
Solution Approach 1:
The system uses dynamic descent rate modulation rather than a fixed high descent rate. By actively adjusting the descent rate based on real-time sway conditions, the system achieves precision delivery while adapting to varying obstacle risks throughout the descent trajectory
Solution Approach 2:
The patent applies preliminary anti-action by using sensors to detect potential sway or swing before the package contacts obstacles. The system takes preventive action by modulating the descent rate in advance to counteract developing sway, preventing obstacle contact rather than reacting after contact occurs
3Manufacturing precision
If sensors and active stabilization systems are implemented to reduce package sway, then delivery precision is improved, but device complexity increases
Solution Approach 1:
The patent applies self-service by designing a system where the package itself carries sensors that monitor its own sway and swing. The package essentially monitors and reports on its own condition, reducing the need for complex external monitoring systems on the UAV
Solution Approach 2:
The system achieves multi-functionality by using the same sensor and control infrastructure for both navigation and package stabilization. The UAV's navigation system and the package stabilization system share common components, reducing overall system complexity while maintaining delivery precision
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
These methods effectively reduce or prevent package sway, ensuring accurate and safe delivery of packages by converting horizontal movement into vertical descent, thereby minimizing the risk of obstacles and improving delivery precision.
Implementation Method 1
modulate the descent of packages and mitigate sway by converting sideways potential energy into downward kinetic energy
Implementation Method 2
winch mechanisms, tether wrapping techniques, and rip-strip mechanisms, to modulate the descent of packages
Data Source
AI summary
An unmanned aerial vehicle (UAV) can deliver a package to a delivery destination. Packages delivered by a UAV may be lowered towards the ground while the UAV continues to fly rather than the UAV landing on the ground and releasing the package. Packages may sway during lowering as a result of wind or movement of the UAV. A package sway may be monitored and mitigated by rapidly paying out a tether, when using a winch mechanism, to dissipate the energy of the sway as downward energy. Further, the UAV may navigate in the direction of the sway or reduce the altitude of the UAV to dissipate the energy of the sway. Open-loop and/or closed loop drop techniques may be utilized to lower a package from the UAV, and the package may be released in the air or on the ground.