Tennessee Technological University owns one of the most extensive noise control facilities in the State of Tennessee with two adjacent reverberation rooms and an anechoic chamber. A typical array of sound measuring equipment is available and includes sound level meters and analyzers, function generators, rotating boom, noise sources and noise dosimeters.The small reverberation room has a volume of 173 m3 and can be used for high frequency sound measurements. The large reverberation room, with a volume of 305 m3, is used for low frequency noise measurement. This room was designed and built with a spring suspension system in order to operate independently and to isolate it from external low frequency vibrations. Comparative sound power or absorption measurements can be made in either room, based on the frequencies of interest. Windows of several sizes are also available between the two rooms so that when a device is mounted there, inlet and outlet noise can be separated and measured independently or transmission properties can be measured. The large reverberation room is not yet certified but meets ANSI and ISO standards for determination of sound power levels and absorption measurements.
A small anechoic chamber (64 m 3) is also available for free-field measurements such as sound power or directivity, or for diagnostics purposes. Foam wedges cover all six walls for fully anechoic measurements but can easily be removed from the floor for semi-anechoic data acquisition.
Acoustics and Non-Destructive Evaluation (NDE)
Lab Location: Stadium, Room 104