Building Acoustics Laboratory

• Transmission of Sound in Finite Surrounds
• Sound Power Directivity
• Sound Absorption Coefficient / Impedance evaluation
• Room Property / Acoustic Evaluation

• Room Acoustic Criterion and Fault Assessment
• Sound Intensity Measurement
• The Transmission of Sound in Finite Surrounds

In support of the research activities mentioned above, the Acoustic Laboratory has the following facilities and instrumentation:

• A Reverberation Chamber of volume 15.4 cu.m (94 cu.ft) with wall absorption coefficients of 0.06 or less from 250 Hz. and upwards. The chamber acts as a source room for Random Sound Absorption Coefficient, Machinery Sound Power Assessment, and for Sound Transmission Loss.
  
  
• An Hemi-Anechoic Chamber of 5.57 cu.m (34 cu.ft) dimension and 0.96 or better absorption, from 100 Hz. upwards. The chamber acts as a source room for machine directivity measurements, and as a reception room for Sound Transmission Loss Measurement via the Point to Point or Scanning Intensity Technique.
  
  
• A series of Impedance Tubes ranging from 20 x 20 cm. cross section to 2.54 cm. diameter. These Tubes allow for Material Normal Absorption or Impedance Evaluation from 40 Hz. to 5 KHz. via the Transfer Function Technique. The tubes may also be employed for the Sound Transmission Assessment of small samples.
  
  
• An Omni Directional Sound Source, employed for the Objective Evaluation of Room Acoustic Criterion
  
  
• A series of instrumentation:
  • The Norsonics Analyzer Type 840, employed for the following:
    • Time Series evaluation of Transients or Cyclical Phenomena.
    • In situ Sound Power Assessment via the Intensity Technique.
    • Room Acoustic Assessment / Reverberation Time via the Impulse Response Technique.
    • Room Acoustic Directional Response via the Sound Intensity Technique.
    • Sound Intensity Mapping in situ or from Sound Transmission Loss Evaluation.
    • Discrete Frequency Analysis of Sound or Vibration via Fourier Transform
  • Additional Sound Intensity and Discrete Frequency Analyzer, capable of sound power evaluation and Cepstrum Analysis.
  • Numerous Sound Pressure Meters for standard sound assessment / statistical analysis for discrete, third octave, octave, and broad band assessment.
  • Transducers ranging from Sound Intensity Probes having pressure / zero intensity characteristics in excess of 20 dB, Directional and Diffuse
  • Microphones and a series of accelerometers and fixing conditions.

Research faculty

Joonhee Lee