Active Shuttle Valve Assembly for UAV Ascent Rate Throttling
Find Innovative SolutionsGenerate Solutions
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 drawn into or released from the ballonet, thereby matching the airflow with aerodynamic drag.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ballast is used to adjust altitude by increasing or decreasing air amount in the ballonet, then altitude control is achieved, but pressure variations and aerodynamic drag impact vehicle control and component durability
Solution Approach 1:
The patent applies dynamics by making the valve assembly active and adjustable during flight. The shuttle valve can be dynamically positioned to different opening degrees, allowing real-time adjustment of air flow rates into the ballonet. This dynamic control enables the system to adapt to varying pressure conditions and aerodynamic drag during ascent and descent, optimizing vehicle control and component durability throughout the flight profile.
Solution Approach 2:
The patent changes the parameter of air flow rate by adjusting the valve opening degree. By controlling how much air enters or leaves the ballonet through the adjustable valve, the system can match airflow with aerodynamic drag conditions at different altitudes and speeds, thereby improving reliability while mitigating the harmful effects of pressure variations and drag.
2Reliability
If additional propulsion means are added to overcome pressure variations and aerodynamic drag, then vehicle control improves, but device complexity and energy requirements increase
Solution Approach 1:
The patent applies self-service by using the existing ballonet air pressure system to control altitude rather than adding separate propulsion means. The adjustable valve enables the ballonet itself to regulate air flow in response to aerodynamic drag and pressure variations, allowing the vehicle to self-adjust its ascent and descent rates without requiring additional engines, rotors, or propulsion components.
Solution Approach 2:
The patent makes the valve assembly multi-functional by enabling it to control both ascent and descent rates through a single mechanism. The same adjustable valve that controls air intake during ascent also controls air release during descent, eliminating the need for separate propulsion systems for upward and downward motion and reducing overall device complexity.
3Productivity
If ascent and descent rates are not matched with aerodynamic conditions, then altitude adjustment is faster, but stress on the balloon increases and lifespan is reduced
Solution Approach 1:
The patent applies feedback by using pressure sensors to monitor conditions inside the ballonet and adjust the valve opening degree accordingly. The system continuously monitors pressure variations and aerodynamic drag conditions, then adjusts the air flow rate to match optimal ascent and descent rates, preventing excessive stress on the balloon while maintaining efficient altitude adjustment.
Solution Approach 2:
The patent uses dynamic adjustment of the valve opening to match ascent and descent rates with current aerodynamic conditions. Rather than using fixed-rate inflation/deflation, the system continuously adapts the air flow rate based on real-time pressure and drag conditions, optimizing both the speed of altitude adjustment and the stress applied to the balloon structure.
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.