Acoustic Resonators for UAV Propeller Noise Harmonization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Propeller-driven vehicles, such as UAVs, emit undesirable whine or drone noise due to high rotational speeds, which can be displeasing and contribute to noise pollution.
Innovation Solution
Incorporating acoustic resonators proximate to the propellers that emit additional tones forming intervals, such as major thirds or perfect fifths, to create harmonious chords or melodies, which can be adjusted using a system with sensors and tuning elements to mitigate the noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If propeller rotational speed is increased to provide thrust and lift, then vehicle performance is improved, but noise pollution increases
Solution Approach 1:
The patent captures the harmful drone noise generated by high-speed propellers and redirects it through acoustic resonators to create useful musical tones. The resonators are tuned to generate specific intervals (major thirds, perfect fifths) that form consonant chords, transforming the unwanted noise into pleasant music while maintaining the propeller's thrust-generating function
Solution Approach 2:
The patent changes the acoustic parameters of the propeller noise by introducing resonators with specific resonant frequencies. These resonators are tuned to particular intervals relative to the propeller's fundamental frequency, altering the spectral composition of the emitted sound from dissonant drone to consonant musical chords
2Object-generated harmful factors
If acoustic resonators are added to emit additional tones, then noise pollution is reduced, but device complexity increases
Solution Approach 1:
The acoustic resonators serve multiple functions: they amplify the propeller's natural tones, generate additional musical intervals, and collectively form consonant chords. The same resonator structure that would normally just amplify noise is made to perform the additional function of creating musical harmony through careful tuning to specific intervals
Solution Approach 2:
The patent divides the acoustic resonator system into multiple independent resonators, each tuned to a specific interval (major third, perfect fifth, etc.). This segmentation allows each resonator to be independently tuned and positioned, simplifying the overall design while achieving complex musical chords through the combination of individual resonator outputs
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 solution effectively reduces noise pollution by transforming the characteristic drone noise into more pleasing sounds, potentially indicating flight mode or purpose, while maintaining operational efficiency.
Implementation Method 1
an acoustic resonator may emit an additional tone that may form an interval, such as a major third or a perfect fifth with the fundamental tone
Data Source
AI summary
The present disclosure relates to devices, systems, and methods for controlling and/or augmenting acoustic sounds emitted from flight vehicles, such as unmanned aerial vehicles (UAVs). For example, while in flight, a UAV may emit a characteristic sound or tone (or a plurality of such tones), which may be a result of propeller and/or motor noise. To mitigate such noise from UAVs, disclosed embodiments may include acoustic resonators that may provide additional tones to complement the sounds or tones emitted from the UAV. Namely, the acoustic resonators may be shaped, adjusted, or otherwise controlled to emit additional tones that form pleasing intervals in combination with the characteristic tone(s) from the UAV.