UAV Icing Control System Using Electro-Thermal Detection
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Solution Overview
Problem
Small unmanned aerial vehicles (UAVs) face significant challenges with icing formation due to their small size and power restraints, which can lead to reduced maneuverability, increased power consumption, and safety risks, especially in cold and cloudy weather conditions, as existing icing detection and prevention methods are either costly, weight-intensive, or not applicable to UAVs.
Innovation Solution
An icing control system that integrates electro-thermal sources and intelligent algorithms for autonomous, energy-efficient detection and prevention of icing, using both electro-thermal-based and model-based detection methods, along with a self-calibrating air data parameter estimator, to accurately detect and mitigate icing without human intervention and minimize power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical icing detectors are used on UAVs, then icing detection accuracy is improved, but cost and weight increase
Solution Approach 1:
The patent replaces optical detection systems with an electro-thermal sensing system. Instead of using optical sensors to detect ice formation, the system uses electro-thermal sources embedded in the wing surface that detect changes in thermal properties when ice forms. This substitution dramatically reduces weight while maintaining detection capability through electrical and thermal measurements rather than optical detection.
2Reliability
If heating elements are continuously operated to prevent icing, then icing prevention reliability is improved, but power consumption increases
Solution Approach 1:
The system implements feedback control by continuously monitoring temperature and thermal properties of the wing surface through electro-thermal sources. The heating elements are activated only when the sensors detect conditions approaching the icing threshold or when ice formation is detected. This feedback mechanism maintains reliable icing prevention while minimizing power consumption by avoiding continuous heating operation.
Solution Approach 2:
The electro-thermal sources operate in periodic cycles, alternating between sensing mode (low power) and heating mode (high power) based on detected conditions. The system periodically checks thermal properties and activates heating only when necessary, rather than operating continuously. This periodic operation maintains protection reliability while significantly reducing average power consumption compared to continuous heating.
3Device complexity
If electro-thermal sources are used for both detection and prevention, then device complexity is reduced, but measurement precision may be affected by heating interference
Solution Approach 1:
The electro-thermal system is segmented into distinct sensing zones and heating zones on the wing surface. The sensing elements operate in specific regions to detect thermal changes, while heating elements are positioned in adjacent or overlapping zones that can be independently controlled. This spatial segmentation allows the system to perform both detection and prevention functions with a single integrated system while minimizing interference between the two functions through zone-specific operation.
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 system provides an intelligent, low-cost, and lightweight solution for detecting and preventing icing on UAVs, ensuring safe and efficient operation by using electro-thermal sources for both detection and prevention, while minimizing power consumption and maintaining aircraft performance.
Implementation Method 1
an electro-thermal source (202) arranged on a surface (204) of the aircraft, wherein the electro-thermal source is configured to heat the surface
Implementation Method 2
a temperature sensor (203) configured to measure a temperature of the electro-thermal source
Data Source
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AI summary
Disclosed herein is a method for determining if icing has occurred on a surface of an aircraft, the method comprising: heating a surface of an aircraft; after the heating has stopped, measuring the temperature of the surface as it cools; and determining if icing has occurred on the surface in dependence on the measured temperature. Advantageously, embodiments provide improved techniques for the detection of icing and the prevention, or mitigation, of icing when it has formed. Embodiments are particularly advantageous when implemented on small UAVs in civilian applications for which autonomous and energy efficient operation is particularly important.