Adjustable Propeller Blades for UAV Noise Reduction
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Solution Overview
Problem
Unmanned aerial vehicles (UAVs) generate noise due to propeller rotation, which can be disturbing to humans and animals, and existing solutions do not effectively mitigate this noise without compromising lifting or thrusting forces.
Innovation Solution
The implementation of adjustable propeller blades that can change position, size, shape, and configuration during flight, allowing for the cancellation of sound waves through phase alignment and interference, and the use of sensors and machine learning to optimize propeller settings for reduced noise and efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If propeller rotation speed is increased to improve lifting force, then lifting force is improved, but noise generation increases
Solution Approach 1:
The propeller blade pitch is made dynamically adjustable during flight operations. The system transitions from fixed pitch to variable pitch, allowing the propeller to optimize between lifting efficiency and noise reduction based on operational requirements. The adjustable pitch mechanism enables real-time modification of blade angle relative to the direction of motion.
Solution Approach 2:
The invention changes the operational parameters of the propeller by adjusting the pitch angle dynamically. This parameter modification allows the system to operate at different efficiency points, selecting between high lifting force mode and low noise mode depending on the situation, thereby resolving the contradiction between force generation and noise reduction.
2Force
If propeller blade size is increased to improve lifting force, then lifting force is improved, but noise generation increases
Solution Approach 1:
The propeller system incorporates dynamic adjustability where blade characteristics can be modified during operation. This allows the system to adapt blade effective size or configuration based on whether the priority is lifting force or noise reduction, rather than being constrained by fixed blade dimensions.
Solution Approach 2:
The propeller may be divided into multiple independently controllable blade segments or sections. This segmentation allows different portions of the propeller to operate with different characteristics - some sections optimized for lifting while others optimized for noise reduction, or allows selective adjustment of individual blades.
3Device complexity
If propeller configuration is fixed to simplify structure, then device complexity is reduced, but adaptability to different operating conditions decreases
Solution Approach 1:
The invention introduces dynamic adjustability to the propeller configuration, transforming it from a static, simplified structure to a dynamically adaptable system. The adjustment mechanism allows the propeller to modify its characteristics during flight, providing operational versatility while maintaining relatively simple mechanical implementation through pitch control systems.
Solution Approach 2:
The adjustable propeller configuration serves multiple functions - it can be optimized for maximum lifting force when needed, for noise reduction when operating near populated areas, and for fuel efficiency during cruise. This multi-functionality allows a single propeller system to handle various operational scenarios that would otherwise require different specialized configurations.
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 noise generated by UAVs while maintaining or optimizing lifting and thrusting forces, enhancing their operational efficiency and maneuverability.
Implementation Method 1
allowing for the cancellation of sound waves through phase alignment and interference
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 and/or configuration of one or more propeller blades of a propulsion mechanism to generate different sounds and/or lifting forces from the propulsion mechanism.