Date of Award
2012
Document Type
Thesis
Degree Name
M.S. in Engineering Science
Department
Mechanical Engineering
First Advisor
Nathan E. Murray
Second Advisor
Wayne Prather
Third Advisor
Elizabeth K. Ervin
Relational Format
dissertation/thesis
Abstract
Aerodynamic noise has been a problem since the first use of the jet engine for military aircraft in World War II. For further uses of the jet engine to be possible, problems due to jet noise must be researched and addressed. Anechoic chambers were proposed as a testing facility for research in aerodynamic noise because of their supposed free-field characteristics. The international standard ISO 3745-1977 was introduced to determine whether the facilities could be considered anechoic, semi-anechoic, or neither. An experiment was designed to determine at what frequencies the National Center for Physical Acoustics' Jet Lab Facility is non-anechoic, semi-anechoic, or anechoic. To comply with the guidelines of ISO 3745- 1977, three sources were designed and tested at frequencies from 25 Hz to 16000 Hz. The voltages were acquired at each frequency to calculate the sound pressure level and determine if the calculated values are within the allotolerance of the inverse square law.
Recommended Citation
Lieblong, Joshua Anderson, "Characterizing The Acoustic Properties Of The Jet Lab At The National Center For Physical Acoustics" (2012). Electronic Theses and Dissertations. 336.
https://egrove.olemiss.edu/etd/336
Concentration/Emphasis
Emphasis: Aeroacoustics