Estimation of Reverberation Time in Classrooms Using the Residual Minimization Method

The objective of the residual minimization method is to determine a coefficient correcting the Sabine’s model. The Sabine’s equation is the most commonly applied formula in the designing process of room acoustics with the use of analytical methods. The correction of this model is indispensable for its application in rooms having non-diffusive acoustic field. The authors of the present paper will be using the residual minimization method to work out a suitable correction to be applied for classrooms. For this purpose, five different poorly dampened classrooms were selected, in which the measurements of reverberation time were carried out, and for which reverberation time was calculated with the use of theoretical methods. Three of the selected classrooms had the cubic volume of 258.5 m3 and the remaining two had the cubic volume of 190.8 m3. It was sufficient to estimate the correction for the Sabine’s equation. To verify the results, three other classrooms were selected, in which also the measurements of reverberation time were carried out. The results were verified by means of real measurements of reverberation time and by means of computer simulations in the program ODEON.

[1]  H Fromme,et al.  Effect of classroom air quality on students' concentration: results of a cluster-randomized cross-over experimental study. , 2012, Indoor air.

[2]  Colin Campbell,et al.  The Same Reverberation Time in Two Identical Rooms does not Necessarily Mean the Same Levels of Speech Clarity and Sound Levels when We Look at Impact of different Ceiling and Wall Absorbers , 2015 .

[3]  Artur Nowoświat,et al.  Prediction of reverberation time using the residual minimization method , 2016 .

[4]  Artur Nowoświat,et al.  Investigation Studies on the Application of Reverberation Time , 2016 .

[5]  Neha Agarwal,et al.  Modelling of particulate matters distribution inside the multilevel urban classrooms in tropical climate for exposure assessment , 2016 .

[6]  Jan Radosz,et al.  Acoustics of Classrooms in Primary Schools – Results of the Reverberation Time and the Speech Transmission Index Assessments in Selected Buildings , 2011 .

[7]  Draško Mašovi,et al.  Reverberation Radius in Real Rooms , .

[8]  Ayman I. Madbouly,et al.  Assessment model of classroom acoustics criteria for enhancing speech intelligibility and learning quality , 2016 .

[9]  S C Lee,et al.  Indoor air quality investigations at five classrooms. , 1999, Indoor air.

[10]  Umberto Berardi,et al.  Simulation of acoustical parameters in rectangular churches , 2014 .

[11]  Akshay P. Patil,et al.  Acoustical characteristics of classrooms of tropical climate , 2017 .

[12]  M Frontczak,et al.  Quantitative relationships between occupant satisfaction and satisfaction aspects of indoor environmental quality and building design. , 2012, Indoor air.

[13]  U. Berardi,et al.  A Revised Sound Energy Theory Based on a New Formula for the Reverberation Radius in Rooms with Non-Diffuse Sound Field , 2015 .

[14]  Paulo Henrique Trombetta Zannin,et al.  Acoustic, thermal and luminous comfort in classrooms , 2004 .

[15]  E Keskinen,et al.  Performance effects and subjective disturbance of speech in acoustically different office types--a laboratory experiment. , 2009, Indoor air.

[16]  Umberto Berardi,et al.  A comparative analysis of acoustic energy models for churches. , 2009, The Journal of the Acoustical Society of America.

[17]  Artur Nowoświat,et al.  Fast estimation of speech transmission index using the reverberation time , 2016 .

[18]  Paulo Henrique Trombetta Zannin,et al.  Statistical comparison of reverberation times measured by the integrated impulse response and interrupted noise methods, computationally simulated with ODEON software, and calculated by Sabine, Eyring and Arau-Puchades’ formulas , 2010 .

[19]  J. S. Bradley,et al.  The intelligibility of speech in elementary school classrooms. , 2008, The Journal of the Acoustical Society of America.

[20]  Nicola Prodi,et al.  Intelligibility, listening difficulty and listening efficiency in auralized classrooms. , 2010, The Journal of the Acoustical Society of America.

[21]  B. Premlet,et al.  Objective and subjective evaluation of acoustic comfort in classrooms: A comparative investigation of vernacular and modern school classroom in Kerala , 2016 .

[22]  Ewa Skrodzka,et al.  Subjective Evaluation of Classroom Acoustics by Teenagers vs. Reverberation Time , 2010 .

[23]  Murray Hodgson,et al.  Experimental investigation of the acoustical characteristics of university classrooms , 1999 .

[24]  C. Kielb,et al.  Building-related health symptoms and classroom indoor air quality: a survey of school teachers in New York State. , 2015, Indoor air.

[25]  L. Beranek,et al.  Analysis of Sabine and Eyring equations and their application to concert hall audience and chair absorption. , 2006, The Journal of the Acoustical Society of America.

[26]  P J Lee,et al.  A laboratory study for assessing speech privacy in a simulated open-plan office. , 2014, Indoor air.

[27]  Lothar Cremer,et al.  Principles and applications of room acoustics , 2016 .

[28]  Arianna Astolfi,et al.  Comparison between measured and calculated parameters for the acoustical characterization of small classrooms , 2008 .

[29]  V Hongisto,et al.  A model predicting the effect of speech of varying intelligibility on work performance. , 2005, Indoor air.

[30]  Jörg M. Buchholz,et al.  Investigating the acoustics of a sample of open plan and enclosed Kindergarten classrooms in Australia , 2015 .

[31]  Young-Ji Choi.  Effect of occupancy on acoustical conditions in university classrooms , 2016 .

[32]  S R Bistafa,et al.  Predicting reverberation times in a simulated classroom. , 2000, The Journal of the Acoustical Society of America.

[33]  Burcin Becerik-Gerber,et al.  A study on student perceptions of higher education classrooms: Impact of classroom attributes on student satisfaction and performance , 2013 .

[34]  Jian Kanga,et al.  Predicting Reverberation Time : Comparison between Analytic Formulae and Computer Simulation , 2002 .

[35]  Bozena Kostek,et al.  Prediction of the reverberation time in rectangular rooms with non-uniformlydistributed sound absorption , 2001 .