BYU Acoustics Research Group

Acoustics Facilities at BYU

There are several physical facilities available on campus at BYU for acoustics and structural dynamics research.  There is an anechoic chamber that simulates free-field radiation conditions.  The chamber has working dimensions of 8.71 x 5.66 x 5.74 m, and is anechoic down to approximately 80 Hz.  In addition, an automated, rotating (by stepper motor), measurement boom in the chamber has been built that allows the acquisition of global radiation data from a source with 13 precision microphones.  This provides the capability of measuring both the directivity function and the radiated acoustic power associated with a source.  Additionally there is an automated microphone positioning system in the chamber that can move to any X and Y position in the chamber to provide scanning capabilities (the vertical Z direction motion controller is under construction).

BYU's Large Anechoic Chamber

In addition to the large anechoic chamber, BYU also has a smaller anechoic chamber with working dimensions of 3.00 x 2.38 x 2.59 m.  This chamber is anechoic down to 150 Hz but is also anechoic in the ultrasonic frequency range as well (whereas the large chamber's high frequency anechoic cutoff is around 20 kHz, due to the perforated metal covering on the wedges).

BYU's Small Anechoic Chamber

There is an additional chamber that has variable acoustic properties, such that various acoustic conditions can be established in the enclosure.  The working dimensions of this room are 3.57 x 2.88 x 2.59 m.

BYU's Variable Acoustics Chamber

Furthermore, two new reverberation chambers have recently been constructed.  The large chamber is 4.96 x 5.89 x 6.98 m (204 cubic meters) and the small chamber is approximately 5.69 x 4.32 x 2.49 m (61 cubic meters).  These rooms are adjacent to each other and are acoustically coupled through a variable test panel (dimensions 2.44 x 3.05 m) to allow transmission loss testing.

             

BYU's Large Reverberation Chamber and Variable Test Panel

There are a number of resources available for performing the numerical analysis involved with projects.  The software packages SysNoise, VitrualLab, IDEAS, CATT, EASE/EARS, Fluent, and FIDAP are available.  Other fairly standard software packages, such as MATLAB and LabView are also available.  The research group has direct access to several PCs, and SGI workstations.  Furthermore, BYU has one of the largest university owned supercomputing facilities, being ranked in the top five nationally.  These supercomputers can run the SysNoise, IDEAS, and Fluent packages when needed, to take advantage of the parallel processing capabilities and faster computation times.

General purpose hardware, such as microphones, loudspeakers, signal filters, and amplifiers are also available to assist in the research.  Multi-channel dynamic signal analyzers are available for general  purpose measurements. Specialty analyzers are available for transducer and room acoustics measurements.  A computer-controlled turntable may be used to rotate booms, sources, sensors, or arrays within chambers if required.  An acoustic intensity probe is available for determining acoustic intensity in a sound field.  General purpose hardware such as microphones, accelerometers, loudspeakers, shakers, and so forth are also available.  A scanning laser Doppler vibrometer (SLDV) is available for noncontact structural vibration measurements.

Partial Listing of BYU Acoustical Equipment and Facilities

Chambers

Analyzers

Transducers

Electronics

Computers

Specialized Software

Other Devices