Active Ballonet Valve Assembly for UAV Ascent Rate Control
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Solution Overview
Problem
Existing altitude control systems for unmanned aerial vehicles face challenges in efficiently controlling ascent and descent rates due to pressure variations and aerodynamic drag, which can impact the durability of the vehicle and its components.
Innovation Solution
A valve assembly is introduced that includes a shuttle and screw assembly, coupled with a motor, to control the flow of air into and out of a ballonet, allowing for precise adjustment of the descent and ascent rates by varying the amount of air permitted to enter or exit, thereby matching the aerodynamic drag and reducing stress on the balloon.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ballast is used to adjust altitude by increasing or decreasing the amount of ballast present in the unmanned vehicle, then altitude control is achieved, but pressure variations and aerodynamic drag impact the ability to control the vehicle and impact the durability of various components
Solution Approach 1:
The patent applies dynamics by making the valve assembly adjustable through the shuttle mechanism. The valve can dynamically change its opening degree to regulate air flow rates, allowing the system to adapt to varying pressure conditions and aerodynamic drag during ascent and descent, thereby maintaining control ability while protecting components from excessive stress
Solution Approach 2:
The patent changes the parameter of air flow rate by adjusting the valve opening degree. By controlling the amount of air entering or leaving the ballonet, the system can match aerodynamic drag and regulate ascent/descent rates, preventing excessive pressure variations that would damage components while maintaining effective altitude control
2Reliability
If the valve assembly controls air flow to match aerodynamic drag, then stress on the balloon is reduced and durability is improved, but the device complexity increases due to the shuttle and screw assembly mechanism
Solution Approach 1:
The patent replaces complex electronic or pneumatic control systems with a simple mechanical screw assembly. The screw thread mechanism converts rotational motion to linear motion of the shuttle, providing reliable mechanical control of the valve opening degree without requiring complex sensors, motors, or control algorithms, thus limiting the increase in device complexity
Solution Approach 2:
The shuttle acts as an intermediary element between the screw assembly and the air flow path. It provides a simple mechanical interface that translates the positional adjustment from the screw mechanism into controlled opening degree of the valve, effectively mediating between the control mechanism and the fluid flow without adding significant complexity
3Speed
If the shuttle is positioned to permit more air flow into the ballonet, then ascent rate increases, but pressure variations and aerodynamic drag increase impacting component durability
Solution Approach 1:
The valve assembly provides dynamic control of air flow rate by adjusting the shuttle position. This allows the system to optimize ascent rate while simultaneously matching aerodynamic drag conditions, preventing excessive pressure variations that would damage components. The dynamic adjustment capability enables balanced performance of both speed and reliability
Solution Approach 2:
By changing the valve opening degree parameter, the system controls the air flow rate into the ballonet. This parameter adjustment enables regulation of ascent rate while matching aerodynamic drag, preventing excessive stress on components. The controlled parameter change allows optimization of both ascent performance and component protection
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 solution enhances the efficiency of the altitude control system by reducing energy requirements for steering and extending the life of the balloon by ensuring that the descent and ascent rates align with aerodynamic forces, minimizing stress and damage from wind fluctuations.
Implementation Method 1
a screw assembly disposed within the cavity of the base plate, wherein a portion of the screw assembly is coupled to a portion of the shuttle
Implementation Method 2
the shuttle may include a seal disposed on the outer surface thereof, the seal configured to abut a portion of the inlet tube
Implementation Method 3
causing an impeller of an altitude control system to rotate in a first direction to draw air through the inlet tube of the valve assembly and into an interior portion of a ballonet
Implementation Method 4
the valve assembly may include a motor coupled to a portion of the base plate, wherein the motor is in mechanical communication with a portion of the screw
Data Source
AI summary
A valve assembly for use with an unmanned aerial vehicle is provided and includes an inlet tube, a shuttle, a base plate, a screw assembly, and a spacer block. The shuttle is partially disposed within the inlet tube and is configured to be placed in a first position where the shuttle abuts the inlet tube and a second position where the outer surface is disposed in spaced relation to the inlet tube. The base plate extends between a first end portion that defines a cavity therein and a second end portion. The screw assembly is disposed within the cavity of the base plate and is coupled to a portion of the shuttle. The spacer block is interposed between the second end portion of the inlet tube and the first end portion of the base plate and is configured to maintain the inlet tube and the base plate in spaced relation.