Vibrations & Acoustics Laboratories

Laboratory

Vibrations & Acoustics Lab

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Department of Mechanical Engineering
133 Durham Hall
Blacksburg, VA 24061
540-231-7273

Chris Fuller

VAL Director
Mission Statement

The Vibration and Acoustics Laboratories (VAL) at Virginia Tech were formed in 1985 to carry out education, fundamental research and applications in acoustics and vibrations as well as support its use in industry. Presently, VAL is focusing on investigating and developing advanced methods for active noise and vibration control systems. Other research work focuses on active-passive methods of reducing noise radiated machinery and transmitted into aircraft interiors. VAL is a Virginia Tech Research Center. Some of the current Master and PhD students are working on noise reduction in incubators as well as ICP sensors that measure brain pressure. Measuring transmission loss and determining absorption coefficients through an impedance tube was also an experiment performed.

News

Thesis defense by Pooja Harekoppa
July 21, 2016 — Pooja Harekoppa successfully defended her Masters thesis: “Application of Computer Vision Techniques for Railroad Inspection using UAVs”.

Thesis defense by Danny Whitehurst
July 12, 2016 — Danny Whitehurst successfully defended his Masters thesis: “Techniques for Processing Airborne Imagery for Multimodal Crop Health Monitoring and Early Bug Detection”.

Facilities

The VAL facilities consist of four laboratories which are dedicated to fundamental studies in sound and vibration. Click the links below or in the menu on the left to learn more about each Lab:

Equipment

  • Durham aneochoic room of inside dimensions (wedge tips to wedge tips) 5.4*4.1*2.4 m and with a cutoff frequency of 100 Hz
  • Durham reverberant chambers (transmission chambers) of volume 40.2m^3 (source chamber) and 40.2m^3 (receiving chamber) connected by a test section
  • Randolph anechoic room of dimensions 4.5*2.2*2.5 m and with a cutoff frequency of 250 Hz
  • Randolph reverberant chambers (transmission chambers) of volume 49.6m^3 (source chamber) and 47.8m^3 (receiving chamber) connected by a test section
  • 2 Dual channel FFT B&K analyzers (2032 and 2034)
  • 1 Portable dual channel FFT B&K analyzer (2048)
  • 1 16-channel Zonic analyzer based on Macintosh
  • 1 Polytech laser vibrometer (OFV-501/OFV-2600)
  • B&K sound levelmeter (2231)
  • B&K sound intensity probe (3520)
  • Automated 1D traverse for array of 90 phase matched microphones (airplane)
  • Automated 2D traverse for vibration measurements of planar structures
  • Automated 2D traverse for vibration measurements of cylindrical structures
  • Automated 1D traverse for acoustic measurement (anechoic chamber)
  • B&K standing wave apparatus (4002)
  • Various signal generators
  • Various shakers
  • Various piezoelectric inertial actuators
  • Various microphones
  • Various accelerometers
  • Various microphone and accelerometer calibrators
  • Various power amplifiers, charge amplifiers and pre-amplifiers
  • Various filters
  • Various oscilloscopes
  • 3 GPIB cards
  • 6 DSP boards TMS320C30 and 1 DSP board TMS320C31 with 5 expansion board sets
  • 1 DSP board TMS320C40
  • 2 C40 DSP boards
  • M67 and Q67 DSP boards
  • Various LMS active control systems for MIMO narrowband and broadband noise fields
  • IBM RISC workstation with a suite of FEM/BEM numerical codes for structural and acoustic analysis

Research Topics

  • Active structural acoustic control with adaptive structures
  • Active trim panels for interior noise control
  • Development of digital feedback controllers
  • Development of compact, high power sound sources
  • Active control of noise radiated from personal computers
  • Development of distributed active vibration absorbers
  • Active vibration control of aircraft interior noise
  • Active absorption of sound
  • Smart skin for sound radiation control
  • Active/Adaptive dynamic vibration absorbers for vibration control
  • Active control of vibration in beams
  • Study on sound transmission in piping systems
  • Active control of sound radiation/transmission from plates
  • Active/Passive control approaches
  • Active control of turbofan inlet noise
  • Active control of non-linear dynamic systems (Unmanned Underwater Vehicles)
  • Development of adaptive feedforward controllers
  • Experimental studies of supersonic inlet noise conducted by W. F. Ng

Recent Sponsors

Laboratory address :
131 Durham Hall, Virginia Tech
Blacksburg, Virginia 24061

Department of Mechanical Engineering
College of Engineering, Virginia Tech
635 Prices Fork Road, Blacksburg, VA 24061
540-231-6045