Location
Salt Lake Community College Student Center
Start Date
5-4-2009 3:00 PM
Description
Scan-based near-field acoustical holography (NAH) shows promise in characterizing rocket noise source regions. A brief explanation of NAH is followed by a description of the virtual coherence technique, which allows one to perform scan-based NAH on uncorrelated fields through the use of multiple stationary reference microphones. Numerical experiments are performed intended to mimic rocket noise with the purpose of determining guidelines for proper number and placement of reference microphones. Results show using more reference microphones is better and proper microphone placement depends upon various factors including frequency and coherence length.
Scan-based Near-field Acoustical Holography on Rocket Noise
Salt Lake Community College Student Center
Scan-based near-field acoustical holography (NAH) shows promise in characterizing rocket noise source regions. A brief explanation of NAH is followed by a description of the virtual coherence technique, which allows one to perform scan-based NAH on uncorrelated fields through the use of multiple stationary reference microphones. Numerical experiments are performed intended to mimic rocket noise with the purpose of determining guidelines for proper number and placement of reference microphones. Results show using more reference microphones is better and proper microphone placement depends upon various factors including frequency and coherence length.