Adaptable Aperture Phased Array Noise Source Decomposition
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Solution Overview
Problem
Conventional systems and methods fail to extract noise subcomponent spectra from phase array data acquired at multiple positions and project them to any spatial location of interest, and they cannot provide subcomponent source location variation with frequency and directivity based on various source location definitions.
Innovation Solution
A system and method using adaptable aperture phased arrays that collect and process noise data from multiple positions, correct for distance, atmospheric absorption, and shear layer refraction effects, and project noise source directivity characteristics to determine usable frequency ranges and source locations, enabling precise noise source decomposition and directivity analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional systems and methods are used for analyzing noise data, then some useful information can be obtained, but they cannot extract noise subcomponent spectra from collected phase array data acquired at multiple phase array positions or project such data to any allowable spatial location of interest
Solution Approach 1:
The patent segments the noise field into distinct subcomponent spectra by applying spatial filtering techniques to phase array data. The noise data is divided into separate sources and components, allowing extraction of individual noise subcomponent spectra from the collected phase array data acquired at multiple positions.
Solution Approach 2:
The patent projects noise data from multiple phase array positions to any allowable spatial location of interest, adding a spatial projection dimension. This enables the system to analyze noise characteristics at arbitrary locations by mathematically projecting the multi-position data to the desired spatial coordinates.
2Measurement precision
If conventional systems are used, then basic noise analysis can be performed, but they cannot provide subcomponent source location variation with frequency and directivity based on various source location definitions
Solution Approach 1:
The patent dynamically determines source locations by calculating positions that vary with frequency. The system computes subcomponent source location variation across different frequencies, allowing the source location to be dynamically adjusted based on the frequency of interest rather than using a fixed position.
Solution Approach 2:
The patent changes multiple parameters simultaneously including frequency, spatial location, and source definition to provide comprehensive noise analysis. By varying these parameters, the system extracts directivity information and source location variation, enabling detailed characterization of noise sources from different perspectives and definitions.
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
Enables accurate extraction and projection of noise subcomponent spectra and source location variation with frequency, providing detailed noise source directivity characteristics and overcoming limitations of existing technologies.
Implementation Method 1
a first phased array 102 of sound sensors... a second, far-field (and, in an exemplary embodiment, polar) array 103 of sound sensors
Implementation Method 2
correcting for at least one of distance, atmospheric absorption, pressure doubling and shear layer refraction effects
Implementation Method 3
correcting for at least one of distance, atmospheric absorption, pressure doubling and shear layer refraction effects
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
A system and method for determining a characteristic of a noise source. A first array (102) of microphones is mounted on a platform moveable from a starting position to an ending position along a line parallel to a central axis of the noise source. A second array (211-221) of microphones includes sound sensors mounted in a spaced apart fixed position with respect to the noise source. A processing system processes first information from the first array (102) of microphones and second information from the second array (211-221) of microphones. The processing system collects and stores the first and second information at each discrete step of the first array (102), spatially filters the first information, processes and calibrates the filtered first information based on the second information, and further processes the calibrated first information to obtain a characteristic at a selected location. For flyover testing, the first array (102) is instead held in a fixed position.