The Non-Environment Control Room

2012 ◽  
pp. 487-518
Keyword(s):  
Control Room ◽  
Environment Control

A Study of Wideband Absorbers in a Non-Environment Control Room: Characterisation of the Sound Field by Means of p-p Probe Measurements

2011 ◽  
Vol 97 (1) ◽  
pp. 82-92 ◽  
Author(s):  
Soledad Torres-Guijarro ◽  
Antonio Pena ◽  
Alfonso Rodríguez-Molares ◽  
Norberto Degara-Quintela
Keyword(s):  
Sound Field ◽  
Control Room ◽  
Environment Control ◽  
Probe Measurements

A Study of Wideband Absorbers in a Non-Environment Control Room: Normal Absorption Coefficient Measurement and Analysis

2012 ◽  
Vol 98 (3) ◽  
pp. 411-417 ◽  
Author(s):  
Soledad Torres-Guijarro ◽  
Antonio Pena ◽  
David Pérez-Cabo ◽  
Norberto Degara-Quintela
Keyword(s):  
Absorption Coefficient ◽  
Acoustic Impedance ◽  
Low Frequency ◽  
Sound Field ◽  
Control Room ◽  
Rear Wall ◽  
Channel Opening ◽  
Measurement And Analysis ◽  
Environment Control ◽  
Coefficient Measurement

This contribution concludes the study initiated in [1] about the wideband absorbers of the rear wall in a nonenvironment control room at the “Universidade de Vigo”. The specific acoustic impedance will be calculated from microphone signals of a p-p intensity probe, and the H2 estimator will demonstrate that it provides the best estimate both at fixed measuring points and in scanning. The absorption coefficient calculated from the specific acoustic impedance is related to the sound field characterisation in the vicinity of the panels: in the very low frequency region it presents maxima and minima attributable to the behaviour of the channels between panels as open-closed tubes, and also shows the effect of the first transverse standing wave in fixed point measurements performed in the centre of the channel opening. This effect disappears in the scanning measurement providing an average absorption curve in a wide area in front of the absorbers. A simple model can be made from the results for the absorption of the wideband absorbers of the rear wall of the room.

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