Tilt-Frame UAV With PTGS for VTOL VOC Sampling Range
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Solution Overview
Problem
Existing tiltrotor UAV designs for agricultural VOC sampling face performance limitations due to complexity, weight, and aerodynamic inefficiencies, making them unsuitable for efficient large-field sampling.
Innovation Solution
A tilt-frame UAV design with a propeller-thrust-governing system (PTGS) and a probe-deployment mechanism, enabling vertical takeoff and landing, high-speed cruising, and precise VOC sampling by extending a probe into tree canopies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a tiltrotor UAV design is used for VOC sampling, then VTOL capability and cruising range are improved, but device complexity and weight increase
Solution Approach 1:
The aircraft is divided into distinct functional modules: a tilt-frame assembly with independently controllable propellers for VTOL, a fixed main wing for cruising, and a probe-deployment mechanism for sampling. This segmentation allows each module to be optimized independently, reducing overall system complexity while maintaining versatility.
Solution Approach 2:
The tilt-frame assembly incorporates dynamically adjustable propeller angles that can be changed during flight. The propellers can tilt between vertical (for VTOL) and horizontal (for cruising) positions, enabling the aircraft to adapt its configuration based on operational requirements without requiring a complete redesign of the propulsion system.
2Length of stationary object
If a tiltrotor UAV design is used for VOC sampling, then cruising range is improved, but aerodynamic performance deteriorates
Solution Approach 1:
The invention merges the advantages of both tiltrotor and fixed-wing designs by integrating a tilt-frame assembly with a conventional fixed main wing. The fixed wing provides stable aerodynamic performance during cruising, while the tilt-frame assembly extends the operational range by enabling vertical takeoff and landing capabilities.
Solution Approach 2:
Different parts of the aircraft have specialized optimizations: the fixed main wing is designed with optimal aspect ratio and airfoil sections for efficient cruising, while the tilt-frame assembly uses high-thrust propellers and adjustable pitch for vertical flight. This localized optimization ensures each component performs its specific function at peak efficiency.
3Adaptability or versatility
If multirotor UAV is used for VOC sampling, then VTOL capability is achieved, but endurance and range are limited
Solution Approach 1:
The aircraft dynamically transitions between vertical and horizontal flight modes. During VTOL operations, the tilt-frame propellers operate vertically to provide lift. Once at altitude, the propellers tilt forward and the aircraft transitions to horizontal cruising using the fixed wing, significantly extending endurance and range compared to dedicated multirotor systems.
Solution Approach 2:
The tilt-frame assembly serves multiple functions: it provides vertical lift during takeoff and landing, acts as a propulsion system during horizontal cruising, and can be adjusted to optimize performance for different flight phases. This multi-functionality eliminates the need for separate VTOL and cruising systems, extending operational duration.
4Length of stationary object
If fixed-wing UAV is used for VOC sampling, then cruising range is improved, but ability to land in fields deteriorates
Solution Approach 1:
The aircraft dynamically adjusts its flight mode based on operational requirements. The tilt-frame assembly can transition from horizontal to vertical orientation, enabling the aircraft to perform vertical landings in confined agricultural fields while maintaining the long cruising range of a fixed-wing design during transit to and from sampling 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
The design allows for efficient VOC sampling across larger fields with improved aerodynamic performance and extended range, overcoming the limitations of traditional tiltrotor systems.
Implementation Method 1
the propeller-thrust-governing system (PTGS) located in proximity to the propeller... By reducing and/or redirecting thrust from the propeller, the PTGS facilitates controlling roll-axis and yaw-axis rotations for the aircraft
Implementation Method 2
control of level flight sustained by rigid-wing lift
Implementation Method 3
collect samples of Volatile Organic Compounds (VOCs) dispersed in the air
Data Source
AI summary
We describe a propeller-thrust-governing system (PTGS) for a propeller that is part of an aircraft. The PTGS includes one or more control surfaces that are located within an airflow of the propeller. The control surfaces are adjustable to reduce thrust produced by the propeller and are also adjustable to redirect the thrust.