Resume

• 6446751

  Operable acoustical isolation curtain

  Quiet Curtain

• 1989

  Georgia Institute of Technology (1989-Present)

  Institute of Sound and Vibration Research

  Southampton

  Syracuse University

  Affiliated with both

  the School of Aerospace Engineering where I teach and Georgia Tech Research Institute where I head Aerospace and Acoustics Technologies Division.

  Regents Professor in School of Aerospace Engg/ Head: Aerospace & Acoustics Technologies

  GTRI

  Greater Atlanta Area

  Georgia Institute of Technology

  Worked in various departments and factories of Rolls-Royce Aero-Engine division and ended up in the Noise Resercah Departent where I conducted jet Noise Experiments for Rolls Royce at National Gas Turbine Establishment at Pyestock. This work was later submitted for a Master of Philosophy (MPhil) .

  Engineering Apprentice

  Derby

  United Kingdom

  Rolls Royce

• 1976

  Lockheed Martin Corp.

  Rolls Royce

  Regents Professor - School of Aerospace Engineering (Joint with GTRI)\t\t(2006-Present)\nDirector and General Manager - Georgia Tech Ireland \t(2007—2009)\nRegents Researcher

  GTRI (Joint with the AE School) \t\t(1994-Present)\nJoint Professor - School of Aerospace Engineering and GTRI (Base GTRI)\t\t1991-2006\nChief: Aerospace and Acoustics Technologies

  Aero Lab

  GTRI\t\t(1998-Present)\nSenior Faculty Research Leader

  GTRI\t\t(1989-Present)\nChief: Acoustics and Aerodynamics Branch

  Aero Lab

  GTRI\t\t(1995-1998)\nChief: Acoustics

  Aerodynamics

  and Advanced Vehicles Division

  Aero Lab

  GTRI\t(1993-1995)\nHead - Acoustics Branch

  Aero Laboratory

  GTRI\t\t(1990-1993)\nActing Head - Aeronautics Branch

  Aero Laboratory

  GTRI\t\t(1993-1993)\nTechnical Area Manager

  Aeroacoustics & Fluid Dynamics

  GTRI\t\t(1989-1990)

  Varied Titles (See below)

  Greater Atlanta Area

  Georgia Institute of Technology (1989-Present)

  Southampton

  UK

  In charge of Jet Noise Experiments\nDesigned a heated Jet facility

  Experimental Officer

  Institute of Sound and Vibration Research

  Southampton

  Helped Design an anechoic chamber and a reverberation chamber and a three-stream coaxial heated-jet facility for jet noise measurements. Calibrated the facilities and made acoustic measurements and flow visualizations of heated supersonic jets with particular reference to reducing supersonic jet noise.

  Graduate Research Assistant

  Syracuse

  New York Area

  Syracuse University

  Marietta

  Georgia

  Acting Department Manager:\nAdvanced Flight Sciences Department\t(1988-1989)\nHead: Aeroacoustics Research Group (Advanced\nFlight Sciences Department); Senior Scientist\t\t(1983-1989)\nScientist\t\t\t(1980-1983)\nFull-Time Consultant in Aeroacoustics\t\t(1976-1980)

  Varied Titles -See below

  Lockheed Martin Corp.

• 1972

  PhD

  Mechanical Engineering

  speciality:Acoustics

  Jet Noise Research

  Syracuse University

• 1969

  Master of Philosophy (M.Phil.)

  Aeronautical Engineering

  Specilaity: Jet Noise. Lead to three journal articles

  University of London

• 1965

  Bachelor of Science (BSc) in Engineering (Hons)

  Mechanical Engineering

  University of London

• Experimentation

  Acoustics

  Aeroacoustics

  Leadership

  Simulations

  Aerospace Engineering

  Aeronautics

  Fluid Dynamics

  Aerospace

  Noise Control

  Research

  Teaching

  Science

  R&D

  Sensors

  Product Development

  Engineering

  Aerodynamics

  CFD

  On the Scaling of Jet Noise with Helmholtz Number Close to the Jet Axis

  That the peak frequency of the jet noise spectrum in the rear arc at small angles to the jet axis does not change with jet exit velocity in unheated jets and scales with Helmholtz number instead of Strouhal number has been known for over 45 years

  but no one has come up with an explanation for this observation. It is demonstrated in this paper for the first time that this scaling with Helmholtz number is primarily caused by the refraction of the sound waves through the jet mean flow. This refraction effect yields a cut-off of the frequency spectra in the rear arc above a Helmholtz number of He = 0.15. The steepness of the decay for each angle depends on the wave propagation Mach number. Scattering reduces the refraction effect for high jet Mach numbers and jet temperatures. The acoustic analogy based on a nozzle-fixed coordinate system must be used to come up with this explanation because the radiated frequency is independent of emission angle in this coordinate system. The experimental jet-noise data obtained in the Noise Test Facility of the Royal Aircraft\nEstablishment (RAE) 1983 are used to verify this result.\n

  On the Scaling of Jet Noise with Helmholtz Number Close to the Jet Axis

  Ahuja