Aircraft Electrical Noise Attenuation Using Anti-Phase Sound Waves
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Solution Overview
Problem
Existing aircraft noise attenuation systems are inadequate in effectively reducing low-frequency electrical system sound waves, which can be unpleasant and disruptive to nearby observers.
Innovation Solution
An active sound attenuation system that includes sensors to detect electrical system sound waves, a controller to generate attenuation signals, and electroacoustic transducers to produce attenuation waves that destructively interfere with and direct these sound waves away from the aircraft, thereby reducing noise pollution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If passive noise attenuation systems are used, then high-frequency noise is reduced, but low-frequency electrical system sound waves are not effectively attenuated
Solution Approach 1:
The patent replaces passive mechanical attenuation systems with an active electronic control system that uses sensors, controllers, and electroacoustic transducers to generate anti-phase sound waves, effectively attenuating low-frequency electrical system noise that passive systems cannot handle
Solution Approach 2:
The patent combines multiple components (sensors, controllers, electroacoustic transducers) into a composite active attenuation system that works synergistically to address the limitations of single-method passive attenuation systems
2Object-affected harmful factors
If active sound attenuation waves are produced to attenuate electrical system waves, then noise reduction is achieved, but system complexity increases
Solution Approach 1:
The controller is designed to perform multiple functions including sensing signal processing, attenuation wave generation, and system coordination, reducing the need for separate dedicated components and simplifying the overall system architecture
Solution Approach 2:
The system uses the electrical system's own sound waves as the target for attenuation, with sensors detecting the actual noise produced and the controller generating corresponding anti-phase waves, creating a self-regulating attenuation mechanism
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 system effectively attenuates electrical system sound waves, minimizing disturbance to observers and enhancing the overall noise reduction capabilities of aircraft.
Implementation Method 1
produce attenuation waves that destructively interfere with and direct these sound waves away from the aircraft
Data Source
AI summary
A method is provided for operating an aircraft system. During this method, an electric machine of an electrical system is operated onboard an aircraft. A first set of electrical system waves produced by the electrical system is sensed. A set of electrical system attenuation waves is produced to attenuate a second set of electrical system waves produced by the electrical system in response to sensing the first set of the electrical system waves.