Faculty Profile
Nathan Murray
Research Assistant Professor of National Center for Physical Acoustics
Phone Number: (662)915-3190
Email: nmurray@olemiss.edu
http://www.olemiss.edu/depts/aeroacoustics/UM_Aeroacoustics/About_Dr._Murray.html
Key Words: jet noise, lab testing, noise reduction, anechoic facility, data analysis, experimental setup, hot flow, wind tunnel, noise reduction, weapon bays, store release, cavity flow
Research Description: Dr. Murray has been with The Aero-Acoustics Group at the National Center for Physical Acoustics (NCPA) since 2001; first as a graduate student and research assistant to Dr. Lawrence Ukeiley, and then as a Research Scientist beginning in 2007 following one year as an Assistant Professor of Mechanical Engineering at Harding University. Dr. Murray began working in the area of acoustics research as a summer intern at the NCPA in 1998. Prior to beginning graduate school, Dr. Murray was an Engineer with the Acoustic Signatures Division at General Dynamics Electric Boat in Groton, CT.
Dr. Murray's expertise include the design and construction of wind tunnels for aeroacoustics research, experimental aeroacoustics measurements (PIV, CTA, Schlieren, LDA, LDV, Pressure Sensitive Paint, SRS, Near-Field and Far-Field Acoustic Arrays, Aero-Optics, etc.), and advanced data analysis (Spectral Analysis, Proper Orthogonal Decomposition, Transient Signal Analysis, Stochastic Estimation, PIV Image Processing, etc.). Dr. Murray's current research efforts include Hypersonic Store Separation, Wind Turbine Acoustics and Control, Atmospheric Boundary Layer Dynamics, Jet Noise Reduction, Blade/Vortex Interaction Acoustics, and Sound Propagation and Monitoring.
Honors Theses:
Ligman, Alexander (2022) Application of the Formal Design of Experiments to Deformed Airfoil Testing (full text)
Deese, Lawrence Edward (2019) Methods Utilizing the Phenomena of Light Scattering to Measure Microscopic Aluminum Oxide Particle Size in both Solution and Turbulent Air Flow (full text)
McGee, Alex (2017) Hot-Fire Testing of an AF-M315E 1-Newton Thruster. (full text)
Skinner, Shawn Wesley (2016) Noise Reduction in the Manufacturing Environment: A Study on Small Jet Geometry Alterations. (full text)
Available Research Projects:
Model Testing in High Speed Wind Tunnels
Project Description: The UM Aeroacoustics is one of the main research groups that makes up the contingent of the Jamie L. Whitten National Center for Physical Acoustics (NCPA). The NCPA is situated on the main Ole Miss campus. With our unique facilities we are continuing to work on fundamental and applied research in the areas of jet noise, cavity noise, high-speed weapons separation, acoustics for wind energy, base flows, combustion, shock/boundary-layer interaction, fluid/structure interactions, and multi-objective design optimization. A major part of our current research involves wind tunnel testing of better designs for cargo and weapons bays at speeds ranging from Mach 0.3 to 5.0 using various non-intrusive measurement methods including high speed photogrammetry, PIV, and Schlieren images. Most of the projects we work on are sponsored by the U.S. Air Force and the aerospace companies. We currently have three wind tunnels, one capable to operating up to Mach 5.0 and two low speed wind tunnels with maximum speeds of 60 and 220 ft/sec.
Desired Student Qualifications: Prospective students should preferably be juniors or seniors in mechanical engineering or physics departments, although others are welcomed to contact the advisor. Selection will be based on in-person interview. Experience in data acquisition, LabVIEW, and MATLAB is welcomed but not required. Due to the nature of the projects, U.S. citizenship or permanent residency is required.
Project Timeline: A number of projects are available, depending on the status of current sponsored contracts; one semester, two-semester, and summer projects are available. The number of hours per week is negotiable.
Duties of Student Researcher: The prospective student will provide hands-on assistance to current researchers during experimental setup in the lab as well as running the tunnel. The student will also be expected to gain understanding of the working theory behind the experiments and provide input during data analysis.
Last Updated on 2013-06-27 00:00:00
Turbulent Jet Phenomena
Project Description: Jets of fluid are found in many applications. Some common examples include water jets in hot tubs, high pressure water jets in metal cutting tools, and jet propulsion. In all but the slowest flows, the interaction between the jet and its surrounding is governed by turbulence. The interested student is encouraged to conceive of a jet related research topic and utilize the NCPA Aeroacoustics facilities to perform experiments that explore the various interactions of turbulence.
Desired Student Qualifications: Prospective students should preferably be juniors or seniors in engineering or physics. Selection will be based on in-person interview. Experience with Excel, Matlab, and/or LabVIEW is strongly encouraged.
Project Timeline: Projects can vary in length from one semester to two-semester or could be as short as a summer project. The number of hours per week depends strongly on the student's desire to learn. Interested students are encouraged to contact Dr. Murray to discuss potential projects.
Duties of Student Researcher: The student will conceive of an experiment, fabricate any necessary models or hardware, perform the experiment including data acquisition, and analyze the results.
Last Updated on 2017-07-14 16:04:01