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 require additional propulsion means.
Innovation Solution
An active valve assembly is used, comprising an inlet tube, a shuttle, a baseplate, and a screw assembly, where the shuttle translates between closed and open positions to control airflow into a ballonet, allowing precise adjustment of ascent and descent rates by varying the amount of air entering or exiting, thereby matching the descent rate with aerodynamic drag.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If ballast air is used to adjust altitude, then the unmanned vehicle can ascend or descend, but pressure variations and aerodynamic drag impact control ability and component durability
Solution Approach 1:
The patent employs a dynamic valve system with a movable shuttle that can adjust its position to control airflow rates. The valve transitions from static to dynamic operation, allowing real-time adjustment of ballast air flow to match varying aerodynamic conditions during ascent and descent, thereby maintaining control ability while protecting components from excessive stress
Solution Approach 2:
The valve system changes the flow rate parameter of ballast air dynamically. By adjusting the shuttle position, the system varies the airflow rate to match changing pressure and aerodynamic conditions, enabling controlled ascent/descent while preventing excessive stress on components that would occur with uncontrolled rapid changes
2Adaptability or versatility
If additional propulsion means are added to navigate against wind, then navigation capability improves, but vehicle complexity and weight increase
Solution Approach 1:
The system uses buoyancy control through regulated ballast air flow as a counterbalance to aerodynamic forces. Instead of adding propulsion to overcome wind, the system adjusts altitude to exploit favorable wind layers, using the buoyancy-force balance to navigate without additional propulsion means
Solution Approach 2:
The unmanned vehicle uses the natural aerodynamic environment and wind patterns to its advantage. By controlling altitude through the valve system, the vehicle allows wind conditions to provide the propulsion and navigation assistance, rather than requiring active propulsion systems to overcome these natural forces
3Loss of time
If rapid ascent or descent is achieved, then time efficiency improves, but stress on balloon increases reducing lifespan
Solution Approach 1:
The valve system provides dynamic control of ballast air flow rates, allowing the system to adjust ascent and descent speeds in real-time. The movable shuttle enables continuous adjustment of flow characteristics, permitting rapid altitude changes when needed while automatically reducing flow rates to protect the balloon during critical phases
Solution Approach 2:
The valve system prepares for potential stress conditions by controlling the rate of ballast air flow in advance. The system can preemptively reduce flow rates before extreme pressure differentials develop, cushioning the balloon against excessive stress and preventing damage that would reduce lifespan
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
This solution enhances the efficiency of the altitude control system by reducing energy requirements, minimizing stress on the balloon, and extending its lifespan by ensuring that the ascent and descent rates align with aerodynamic conditions, thus improving the overall control and durability of the unmanned aerial vehicle.
Implementation Method 1
pressure variations and aerodynamic drag acting on the unmanned vehicle as it ascends or descends
Implementation Method 2
pressure variations and aerodynamic drag acting on the unmanned vehicle as it ascends or descends
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.