Propeller Blade Leading Edge Serrations for UAV Noise Control
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Solution Overview
Problem
The increasing presence of aerial vehicles, such as unmanned aerial vehicles (UAVs), in residential areas poses a challenge in managing the noise generated by their propellers, which can disrupt peace and potentially cause disturbance to residents.
Innovation Solution
The implementation of propeller blade treatments on UAVs that alter the sound generated by disrupting airflow or absorbing sound, using techniques such as serrations, fringes, and sound-dampening materials, along with adjustable propeller blade treatments and sensors to measure and adjust sound levels dynamically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional propeller blades are used, then propulsion efficiency is maintained, but noise levels are high and disrupt residential areas
Solution Approach 1:
The propeller blade leading edge is segmented into multiple serrations or teeth rather than being a smooth continuous edge. This segmentation disrupts the airflow in a controlled manner, reducing the coherent noise while maintaining sufficient thrust generation through the distributed interaction of multiple smaller edges
Solution Approach 2:
The serrations are applied locally only to the leading edge portion of the propeller blade where airflow separation and noise generation occur, rather than modifying the entire blade structure. This localized modification reduces noise while preserving the aerodynamic efficiency of the rest of the blade
2Object-affected harmful factors
If serrations are added to reduce noise, then sound levels decrease, but manufacturing complexity increases
Solution Approach 1:
The serration geometry parameters (depth, width, spacing, angle) are optimized to achieve effective noise reduction with minimal manufacturing complexity. By controlling these parameters within certain ranges, the serrations can be manufactured using conventional propeller manufacturing processes without requiring entirely new fabrication methods
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 approach effectively reduces and alters the noise produced by UAVs during flight, enhancing their operational efficiency and minimizing disturbance to communities by optimizing sound levels based on environmental and operational conditions.
Implementation Method 1
The serrations may extend along a leading edge of the propeller blade. The serrations may disrupt airflow over the propeller blade.
Implementation Method 2
propeller blade treatments that alter the sound generated by disrupting airflow or absorbing sound
Data Source
AI summary
Sounds are generated by an aerial vehicle during operation. For example, the motors and propellers of an aerial vehicle generate sounds during operation. Disclosed are systems, methods, and apparatus for actively adjusting the position of one or more propeller blade treatments of a propeller blade of an aerial vehicle during operation of the aerial vehicle. For example, the propeller blade may have one or more propeller blade treatments that may be adjusted between two or more positions. Based on the position of the propeller blade treatments, the airflow over the propeller is altered, thereby altering the sound generated by the propeller when rotating. By altering the propeller blade treatments on multiple propeller blades of the aerial vehicle, the different sounds generated by the different propeller blades may effectively cancel, reduce, and/or otherwise alter the total sound generated by the aerial vehicle.