Aerial Vehicle Propeller Noise Shaping via Intentional Imbalance
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Solution Overview
Problem
Traditional methods for balancing propellers in aerial vehicles fail to effectively manage noise levels and vibrations, leading to undue stress on components and undesirable noise emissions, which can be a concern for both operational efficiency and environmental considerations.
Innovation Solution
The method involves outfitting aerial vehicles with a combination of balanced and intentionally imbalanced propellers, allowing for selective operation based on specific criteria such as thrust, lift, maneuverability, or noise profiles, to achieve desired sound pressure levels and frequency spectrums during operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If propellers are intentionally imbalanced to emit specific sounds, then noise control is improved, but vibrations and component stress increase
Solution Approach 1:
The aerial vehicle is divided into multiple rotor groups, with each group containing propellers of different balance characteristics. This segmentation allows the system to emit specific sounds through selected imbalanced propellers while using balanced propellers in other groups to counteract vibrations and reduce component stress.
Solution Approach 2:
Different propellers within the same rotor group are assigned different balance qualities - some are intentionally imbalanced to generate desired sound characteristics, while others are balanced to minimize vibrations. This local differentiation of quality allows simultaneous achievement of noise control and vibration reduction.
2Object-affected harmful factors
If homogenous balanced propellers are used, then vibrations are minimized, but noise control and sound shaping capabilities are reduced
Solution Approach 1:
The system introduces asymmetry by equipping the aerial vehicle with propellers of different balance characteristics within the same rotor group. This asymmetric configuration enables sound shaping capabilities while maintaining vibration minimization through the complementary balanced propellers.
Solution Approach 2:
The system dynamically selects which propellers to operate based on desired sound characteristics and operational conditions. By controlling the operation of imbalanced versus balanced propellers, the system can adaptively shape noise while managing vibrations in real-time.
3Adaptability or versatility
If multiple sets of propellers with different characteristics are used, then operational versatility is improved, but device complexity increases
Solution Approach 1:
Each rotor group is designed to be universal, containing propellers that can serve multiple functions - both balanced and imbalanced propellers are integrated into the same group, allowing each rotor group to contribute to both thrust generation and sound shaping, thereby reducing the need for completely separate systems.
Solution Approach 2:
The system merges the functions of sound generation and vibration control by integrating both balanced and imbalanced propellers within the same rotor groups. This combining approach allows simultaneous achievement of operational versatility and simplified system architecture.
Data Source
Figure 1A
Figure 1B~1C
Figure 2A~2C
AI summary
Aerial vehicles may be operated with discrete sets of propellers, which may be selected for a specific purpose or on a specific basis. The discrete sets of propellers may be operated separately or in tandem with one another, and at varying power levels. For example, a set of propellers may be selected to optimize the thrust, lift, maneuverability or efficiency of an aerial vehicle based on a position or other operational characteristic of the aerial vehicle, or an environmental condition encountered by the aerial vehicle. At least one of the propellers may be statically or dynamically imbalanced, such that the propeller emits a predetermined sound during operation. A balanced propeller may be specifically modified to cause the aerial vehicle to emit the predetermined sound by changing one or more parameters of the balanced propeller and causing the balanced propeller to be statically or dynamically imbalanced.