Fuel Cell Powered Line-Replaceable Thrust Module for UAVs
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Solution Overview
Problem
Unmanned aerial vehicles (UAVs) are limited in range and flight time due to battery power, and existing fuel cell technologies are complex and difficult to maintain, especially in remote locations.
Innovation Solution
The development of a UAV with fuel cell powered line-replaceable thrust modules, featuring a rapid connection interface and a propulsion system with an electric motor and rotor assembly, allowing for easy replacement and configuration of thrust modules to adapt to various mission requirements, including thrust vectoring capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If fuel cell powered vehicles use onboard hydrogen fuel tanks and electrochemical reactions to extend range and flight time, then the range and flight time are extended, but the device complexity increases making repair difficult at operating locations
Solution Approach 1:
The fuel cell system is divided into modular components: a fuel cell stack module, a hydrogen storage tank module, and an electric motor module. Each module can be independently replaced, maintaining extended flight time capability while simplifying field maintenance through component-level replacement rather than system-level repair.
Solution Approach 2:
The patent implements a replaceable fuel cell stack design where depleted stacks are discarded and replaced with fresh ones. The hydrogen storage tanks are also designed to be replaceable. This approach maintains extended operational duration while simplifying maintenance by replacing consumable components rather than repairing complex electrochemical systems in the field.
2Length of moving object
If UAVs use conventional takeoff and landing aircraft configurations with long runways, then forward airspeed and range are improved, but the ability to operate in congested, isolated, or remote areas is reduced
Solution Approach 1:
The UAV employs VTOL capability that allows it to perform multiple functions: vertical takeoff and landing for accessing congested or remote areas, and forward flight for achieving extended range. The same propulsion system and control architecture support both operational modes, providing universality across different mission requirements without sacrificing range capability.
Solution Approach 2:
The aircraft uses dynamic control of thrust vectors and rotor configurations to transition between vertical and forward flight modes. By dynamically adjusting the orientation and operation of propulsion components, the UAV adapts its flight characteristics to match mission requirements, enabling operation in both confined areas and extended range scenarios.
3Adaptability or versatility
If UAVs use helicopters with rotors for vertical takeoff and landing and hovering, then operational versatility in congested areas is improved, but forward airspeed and range are reduced
Solution Approach 1:
The propulsion system is designed with multi-functionality to provide both vertical lift for hovering and forward thrust for high-speed flight. The same electric motors and propeller/rotor assemblies that enable helicopter-like VTOL operations also generate the forward thrust needed for extended range, eliminating the need for separate propulsion systems for different flight regimes.
Solution Approach 2:
The patent merges the lift-generating and thrust-generating functions into a single integrated propulsion system. The rotors or propellers serve dual purposes: providing vertical lift during VTOL operations and generating forward thrust during horizontal flight. This consolidation maintains operational versatility while achieving extended range through efficient use of propulsion resources.
4Duration of action of moving object
If fuel cell systems with electrochemical reactions are used to power UAVs, then range and flight time are extended, but ease of repair at operating locations deteriorates due to system complexity
Solution Approach 1:
The fuel cell system is segmented into discrete, replaceable modules including the fuel cell stack, hydrogen storage tank, and balance of components. This segmentation allows field maintenance to focus on simple module replacement rather than complex electrochemical repair, preserving extended flight time capability while dramatically improving ease of repair at operating locations.
Solution Approach 2:
The fuel cell stacks are designed as disposable or limited-life components that are replaced rather than repaired in the field. This approach maintains extended operational duration by using multiple stacks in sequence, while simplifying maintenance to simple replacement operations that do not require specialized repair capabilities at remote operating locations.
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 extended range and flight time for UAVs while simplifying maintenance through modular and easily replaceable components, enhancing versatility and efficiency in diverse operational conditions.
Implementation Method 1
Fuel cells operate by allowing an electrochemical reaction between hydrogen and oxygen, which produces electrical energy and water
Implementation Method 2
The electrical energy produced drives a motor
Implementation Method 3
a rotor assembly having a plurality of rotor blades that are rotatable with the output drive of the electric motor in a rotational plane to generate thrust
Data Source
AI summary
A line-replaceable thrust module includes a nacelle configured to be mechanically connected to an anchoring location of an unmanned aerial vehicle (UAV), an electric motor coupled to the nacelle, an electric speed controller configured to control the speed of the electric motor and configured to be electrically connected to a communication network of the UAV, and a fuel cell system configured to produce electrical energy from an electrochemical reaction between hydrogen and oxygen. The fuel cell system includes a fuel cell, a hydrogen tank, a pressure regulator coupled to the hydrogen tank, and a supply line coupled between the pressure regulator and the fuel cell.