UAV Propeller Modulation for Noise Reduction
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Solution Overview
Problem
Unmanned aerial vehicles (UAVs) generate noise during delivery, which can be disruptive to nearby users and environments, and existing solutions do not effectively manage sound levels or resonance.
Innovation Solution
UAVs are configured with multiple sets of differently sized propellers that can be modulated in terms of size and rotational speed to reduce noise levels and generate a more pleasurable sound, using sensors to create sound profiles and adjust propeller configurations dynamically based on environmental and operational data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UAVs operate with standard propeller configurations, then delivery operations can be performed efficiently, but noise levels become disruptive to nearby users and environments
Solution Approach 1:
The patent applies dynamics by making the propeller configuration adjustable and changeable during operation. The system can dynamically switch between different propeller sets (e.g., larger propellers for quiet operation near delivery locations, smaller propellers for efficient transit) based on real-time conditions such as distance to destination, battery level, and environmental factors, thereby resolving the contradiction between efficient delivery and noise reduction.
Solution Approach 2:
The patent implements parameter changes by varying propeller physical parameters (size, pitch, rotational speed) to control noise output. By adjusting these parameters according to operational phase and environmental conditions, the system maintains delivery efficiency while reducing harmful noise levels in sensitive areas.
2Object-generated harmful factors
If multiple sets of differently sized propellers are used to reduce noise, then noise pollution is reduced, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the propeller system into multiple independent sets of differently sized propellers. Each set can be independently selected and deployed based on operational requirements, allowing noise reduction without requiring complete system redesign. The segmentation enables modular complexity management.
Solution Approach 2:
The patent implements universality by designing a propeller system where multiple propeller sets serve different functions (transit, delivery, noise-sensitive areas, battery-saving mode). This multi-functional approach consolidates what could be separate systems into one integrated propeller management system, reducing overall complexity while achieving noise reduction.
3Productivity
If propeller rotational speed is increased to maintain delivery speed, then delivery efficiency is maintained, but noise levels increase
Solution Approach 1:
The patent resolves this contradiction by changing the propeller parameter from rotational speed to physical size. Larger propellers can move the same amount of air at lower rotational speeds, maintaining delivery speed and efficiency while significantly reducing noise levels. This parameter substitution eliminates the direct relationship between speed and noise.
Solution Approach 2:
The patent applies the counterweight principle by using larger propeller surface area to counterbalance the need for high rotational speed. The increased propeller size provides the necessary thrust at lower RPMs, effectively counteracting the noise-generating effect of high-speed rotation while maintaining delivery performance.
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 and alters sound resonance to create a more acceptable auditory experience for nearby users during UAV operations, improving user satisfaction and reducing noise disruption.
Implementation Method 1
a first set of propellers of a first size... a second set of propellers of a second size
Implementation Method 2
using sensors to create sound profiles and adjust propeller configurations dynamically
Implementation Method 3
alters sound resonance to create a more acceptable auditory experience
Implementation Method 4
effectively reduces noise pollution and alters sound resonance
Data Source
AI summary
Techniques for using an unmanned aerial vehicle (UAV) to deliver a payload while generating an expected sound by the UAV during delivery may be provided. For example, during delivery or while in flight, propellers of different sizes that are associated with the UAV may be instructed to modulate at different rotational speeds to thereby generate an expected sound.