Passive Pneumatic Self-Leveling Support for UAVs on Uneven Terrain
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Solution Overview
Problem
VTOL UAVs face instability and limited utility when landing on sloped or uneven surfaces due to the lack of a pilot for visual feedback, and similar issues exist with stationary devices like tables and ladders, which require level orientation for safe operation without relying on active systems with sensors and motors.
Innovation Solution
A passive self-leveling support apparatus using independently extending and retracting leg members with a closed pneumatic or hydraulic fluid assembly, where one leg's compression elongates others, ensuring level orientation without sensors, motors, or controls, and incorporating locking valves for stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If active leveling systems with sensors and motors are used, then leveling precision is improved, but device complexity and power requirements increase
Solution Approach 1:
The system uses the weight of the UAV itself to drive the leveling process. When the UAV lands on uneven terrain, the heavier side naturally sinks first, compressing the air spring on that side and automatically extending the air spring on the lighter side through fluid transfer, achieving self-leveling without external control
Solution Approach 2:
The invention uses an air spring system with fluid transfer between left and right chambers. The air springs act as pneumatic actuators that automatically adjust leg lengths based on weight distribution, replacing motorized actuators with a passive pneumatic balancing mechanism
2Measurement precision
If active leveling systems with sensors and motors are used, then leveling precision is improved, but weight increases
Solution Approach 1:
The system uses the weight of the UAV itself to drive the leveling process. When the UAV lands on uneven terrain, the heavier side naturally sinks first, compressing the air spring on that side and automatically extending the air spring on the lighter side through fluid transfer, achieving self-leveling without external control
Solution Approach 2:
The invention uses an air spring system with fluid transfer between left and right chambers. The air springs act as pneumatic actuators that automatically adjust leg lengths based on weight distribution, replacing motorized actuators with a passive pneumatic balancing mechanism
3Device complexity
If passive self-leveling system is used, then device complexity is reduced, but adaptability to extreme terrain conditions may worsen
Solution Approach 1:
The air spring system is inherently dynamic, automatically adjusting to changing weight distributions as the UAV settles on terrain. The fluid transfer mechanism continuously balances the system as conditions change, providing adaptive response without active control
Solution Approach 2:
The air springs are pre-charged with compressed air and fluid before landing. This preliminary pressurization enables the system to immediately respond to terrain variations upon contact, providing instant leveling action without requiring power activation
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 VTOL UAVs and devices like tables and ladders to maintain level orientation on uneven surfaces efficiently, reducing instability and operational risks, and providing cost-effective and reliable support without the need for power sources or electronic controls.
Implementation Method 1
a closed pneumatic or hydraulic fluid assembly comprising one cylinder associated with each leg member. The fluid assembly is configured such that each leg displaces its own cylinder and all cylinders are connected together into one system through a manifold. As one leg contacts the landing surface during descent, the shortening leg displaces the fluid within the cylinder of that leg and resultantly elongates one or more of the other legs.
Implementation Method 2
two or more hydraulic cylinders each having a piston rod extending in a downward angle and a housing the upper end of which is attached to the unit being supported wherein the cylinders are connected by one or more hydraulic lines configured to allow the cylinders to share a single reservoir of hydraulic fluid such that compression of one cylinder resulting from contact between the piston rod and a surface produces elongation of other cylinders.
Data Source
AI summary
Provided is a self-leveling support apparatus for use with a UAV or stationary device such as a table or ladder, the apparatus having multiple leg members, each associated with a hydraulic or pneumatic cylinder; a connection among the hydraulic or pheumatic cylinders such that they share a common reservoir of fluid; a locking mechanism that obstructs free flow of fluid among the cylinders and stabilizes the UAV or stationary device without the need for electronic sensors or control systems.