Acougamic: Dynamic Acoustical Control
|
|
- Chad Robbins
- 5 years ago
- Views:
Transcription
1 Acougamic: Dynamic Acoustical Control MOHAMED HUSSEIN, NURUL FARHANAH MUARAT, RAJA ISHAK RAJA HAMZAH, ZAIR ASRAR AHMAD, MAZIAH MOHAMED, MOHD ZARHAMDY MD ZAIN and *NORASIKIN MAT ISA Department of Applied Mechanics, Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, 81310, Johor Baharu, Johor MALAYSIA *Dept. of Plant and Automotive Engineering, Faculty of Mech. and Mfg. Engineering, Universiti Tun Hussein Onn Malaysia, Batu Pahat, Johor MALAYSIA Abstract: - This paper presents a preliminary study on variable acoustic technique using acougamics which is the use of origami shapes in acoustical control. The acougamics are acoustic diffusers constructed from a flat sheets folded in origami-like manner. Three acougamics are presented in this paper. The purpose of the study is to investigate the possibility of using acougamics to vary the reverberation time of a multi-purpose hall. Findings from the preliminary investigation reported in this paper are based on the three acougamics being tested according to ISO 354:2003 standard in Measurement of Sound Absorption in a Reverberation Room. The results from the preliminary investigation have shown promising trends demonstrating that the acougamic is capable to be used as a technique to provide variable acoustic of multi-acoustic requirements. Key-Words: - Origami, variable acoustic, multi-purpose hall, sound absorption 1 Introduction Because of economic reasons, the building of multipurpose halls has become apparently common recently [1]. Thus, variable acoustic techniques are necessary in order to accommodate various types of events in the multi-purpose hall, which normally focus on changing the reverberation time according to the required event. This is due to the fact that different types of acoustic events will require different optimum reverberation time, as reverberation time is the crucial parameter to determine the quality of the sound produced. The available techniques on variable acoustics so far can be divided into several ways, namely variable volume, variable absorption, variable scattering and electroacoustic system. Each technique has its pros and cons. Variable volume technique is normally achieved using a movable ceiling, movable shutter system and by coupling the hall with a reverberation chamber to provide adjustable reverberation time [2]. Milton Keynes Theatres, for instance, uses a movable ceiling technique in which its ceiling can be moved in a vertical distance of 10 m and result in a reverberation time range of 1.1 to 1.5 seconds [1]. Another example is Studio Acusticum in Sweden where the ceiling of the hall can be adjusted up to 5m which effectively changes the reverberation volume by 30% [3]. Besides that, the advantage of varying the volume is that it gives a significant change to the reverberation time, and at the same time is able to maintain the sound level inside the hall [4,5]. However, the variability of the reverberation time based on the variable volume is quite costly and sometimes the degree of variability is unsatisfactory [1]. It is also technically more difficult compared to variable absorption technique [6] Variable absorption technique is a most common technique used in the control of reverberation time of multi-purpose halls. The technique is realized through the use of retractable curtains, hinged panels, acoustic banner, adjustable audience seats and/or movable reflectors [1,2,4,5]. This technique has been employed in Fitzwilliam College Auditorium, Cambridge, where the change of reverberation time is accomplished using acoustical absorbing panels and retractable audience seats. The result of the technique produces a reverberation time range of 1.3 to 1.5 seconds which is appropriate for music and speech performance [4]. However, the problem ISBN:
2 associated by variable absorption is it reduces the sound strength and it causes the hall to seem quiet even though the reverberation time is reduced. The effectiveness of this technique also depends on the thickness of the acoustic material which means that high thickness is necessary in order to absorb sound at low frequency [7]. Hence, the limitation of variable absorption is that it is only suitable to be used for sound absorption at low frequency ranges. On the other hand, variable scattering technique, which involves the replacement of flat surfaces with scattered surfaces, has also been tested to improve the sound diffusivity inside a hall. However, the effect on reverberation time is usually not so obvious as compared to the use of variable absorption technique [1]. Variable absorption, variable volume and variable scattering techniques are passive control methods of which the changes of reverberation time are obtained through physical means. Electroacoustic contrariwise is an active control method used to control reverberation by changing the properties of a room electronically using loudspeakers, microphones and recorders in order to produce reverberant halls [8]. However, many musicians are against performing in electronic enhancement environment [1]. This is probably due to the unnatural sound produced. Therefore, this paper proposes another method in controlling reverberation time, which is based on origami concept. This idea is inspired by a parametric survey conducted on the prediction of sound absorption on a periodic rectangular groove structure, where according to the investigation, sound absorption characteristics can be designed by adjusting the parameter of the profile in a suitable way [9]. That means sound absorption properties are dependent on the parameter of the rectangular groove structure, but in that research, the structure is rigid and it would be good if the structure is deformable where the sound absorption properties can be changed according to the deformation of the structure. According to Sabine Equation [10], reverberation time can be varied by changing the volume and the absorption, so to provide variable reverberation time is either by changing the volume of the room or by changing the absorption properties inside the room. 2 Acougamic Acougamic in this paper is the combination of acoustic and origami. Origami originates from Japanese word and it is widely utilized in engineering applications [11]. The concept of origami is by folding a flat sheet to become a three-dimensional structure. In this paper, three types of acougamic are presented as shown in Figure 1 to Figure 3. In order to check the feasibility of the proposed method, the acougamics are tested in the reverberation chamber according to ISO 354. The acougamics are folded using 1200 gsm chipboards and are joined using white glue to form a large specimen. Figure 1: Acougamic 1 Figure 2: Acougamic 2 Figure 3: Acougamic 3 In this paper, the purpose of the investigation is to see whether the acougamics have the potential to provide variable absorptions by changing their geometrical properties. This is because when the acougamics in Figure 1, Figure 2 and Figure 3 are dynamically deformed in the x direction, the geometric properties (value h and x) of the acougamics change as well. 3 Experimental Method In the preliminary study, three acougamics are tested in a reverberation room of Faculty Mechanical Engineering, UTM. The reverberation room has a volume of m 3 and a Schroeder frequency of ISBN:
3 500 Hz. The measurement procedures are according to ISO 354:2003 Measurement of Sound Absorption Coefficient in a Reverberation Room [12]. Measurements are taken in the empty reverberation room, and then again with the presence of the specimens of different configurations as tabulated in Table 1 to Table 3. The excitation inside the reverberation room is carried out using balloon bursts and the impulse responses are recorded by a Solo 01dB Sound Level Meter from two different microphone positions. The microphones are 1.5 m apart and the distance of the specimen to the microphone is 1m. Each measurement is repeated four times and the reverberation times are then averaged for the two microphone positions. The temperature and relative humidity of the measurement were maintained approximately at 26 C and 78% throughout the whole measurement. Table 1: Geometrical Configurations of Acougamic 1 h x z Area (m 2 ) Table 2: Geometrical Configurations of Acougamic 2 h x w z Area (m 2 ) Table 1 until Table 3 represent the geometrical configurations of acougamic 1, acougamic 2 and acougamic 3 respectively. In this study, the surface area of each acougamic is the same, which is m 2. This is because according to Sabine Equation, variation of surface area would affect the absorption inside the room [10], thus in order to investigate the effect of other geometric parameters, the surface area should remain fixed. For each acougamic, the number of geometrical configurations is different due to different structure. Referring to Table 1, when acougamic 1 is dynamically deformed at initial position, which is at configuration 1 to final position at configuration 4, the geometric parameters h and x are varied simultaneously while value z remains the same throughout the process. Table 2 shows that when acougamic 2 is dynamically deformed, the parameter h and x are also varied simultaneously but values w and z remain the same. The same goes for acougamic 3, in Table 3, where the varied geometric parameters are h and x. Table 3: Geometrical Configurations of Acougamic 3 h x y z Area (m 2 ) Results and Analysis The results and analysis of this preliminary investigation are according to 1/3 octave band frequency range, which has been specified in ISO 354. The results presented are in the form of sound absorption coefficient. The main focus is to see whether the acogamics are capable in providing variable sound absorption coefficients when the acougamics are dynamically deformed. Figure 4 to Figure 6 show the results of sound absorption coefficients of several geometrical configurations of acougamic 1, acougamic 2 and acougamic 3. Acougamic 1 has four geometrical configurations followed by acougamic 2, which has ISBN:
4 six geometrical configurations, and lastly acougamic 3 has five geometrical configurations. Figure 4 shows the variation of sound absorption coefficients of acougamic 1 when its geometric properties changes from configuration 1 to configuration 4. At the frequency of 2000 Hz and above, the variations of the results show good trends. Based on the trends, sound absorption coefficients decrease as the acougamic 1 changes its configurations from 1 to 4. The differences on the sound absorption coefficients from one configuration to another seem inconsistent throughout the measurements. Meanwhile, Figure 5 shows the change of sound absorption coefficients from configurations 1 to 6. This clearly indicates that at a frequency of 2000 Hz and above, the sound absorption coefficients decrease as acougamic 2 changes its geometrical configurations, but at configurations 3, 4 and 5, the trends seem unchanged. Similarly, a same trend is also observed at Figure 6 where the sound absorption coefficients slightly decrease as the geometrical configurations of acougamic 3 vary from configurations 1 to 5. Although the results show small differences, the differences between configurations were still noticeable. However, the results of sound absorption coefficients at low and mid frequencies did not show any conclusive trends. This is due to the fact that the wavelengths are very long at low frequencies, thus the thickness of the material should be at least onequarter of a wavelength in order to effectively absorb sound at those frequencies ranges (see Table 4) [13]. Consequently, the results show good trends at high frequencies which are above 2000 Hz, which is probably due to the depth of the acougamic being sufficient to absorb sound at high frequencies. Besides that, the measured sound absorption coefficients are often more inaccurate at low than high frequencies due to modal effects [14]. In addition, since the specimen is quite large, at about m 2, and joined with white glue, there are surface irregularities. This problem then affects the measurement process, especially when taking the value of geometric parameters h, x, w, y and z, as well as maintaining the fixed surface area. The surface irregularity of the acougamic also might contribute to the edge effects which will result in poor prediction of sound absorption coefficients [15]. changes are small. However, this is only a preliminary investigation, and future works in a onefifth scale model of the reverberation chamber will be carried out as to verify the current results. Figure 4: Variation of Sound Absorption Coefficient for Acougamic 1 Figure 5: Variation of Sound Absorption Coefficient for Acougamic 2 5 Conclusion The present preliminary work has shown good trends on the variation of sound absorption for Acougamic 1, Acougamic 2 and Acougamic 3 even though the Figure 6: Variation of Sound Absorption Coeffiient for Acougamic 3 ISBN:
5 Table 4: Wavelengths of the Frequencies in 1/3 Octave Band [13] ¼ of the Frequency Wavelength Frequency Wavelength Acknowledgements The authors would like to thank Universiti Teknologi Malaysia (UTM) and Ministry of Education, Malaysia (MOE) for providing continuous support, especially in term of funding through GUP (Vot:05H30) and FRGS (Vot: 4F524). References: [1] M. Barron, Acoustics for multi-purpose use, Auditorium Acoustics and Architectural Design, Second., London and New York: Spon Press, 2010, p [2] F. A. Everest and K. C. Pohlmann, Adjustable Acoustics, in Master Handbook of Acoustics, 5th ed., McGraw-Hills, 2009, p [3] R. Okvist, A. Ågren, and B. Tunemamlm, Studio Acusticum A Concert Hall with Variable Volume, in Proceedings of the Institute of Acoustics, 2008, vol. 30, pp [4] M. Aretz and R. Orlowski, Sound strength and reverberation time in small concert halls, Appl. Acoust., vol. 70, no. 8, pp , Aug [5] M. A. Poletti, Active Acoustic Systems for the Control of Room Acoustics, Proceedings of the International Symposium on Room Acoustics, ISRA, 2010, no. August, pp [6] W. Chiang, W. Lin, Y. Chen, and H. Hu, Variable Acoustics Design of a Small Proscenium Concert Hall, Asian Archit. Build. Eng., no. May, pp , [7] T. Geometry, Variable Acoustics, Recording Studio Design, Elsevier Ltd, 2012, pp [8] R. W. Schwenke, J. R. Duty, and P. E, NOISE-CON 2010 Electroacoustic Architecture : Is it Green?, Noise-Con 2010, [9] J. Wang, P. Leistner, and X. Li, Prediction of sound absorption of a periodic groove structure with rectangular profile, Appl. Acoust., vol. 73, no. 9, pp , Sep [10] H. Kuttruff, Room Acoustics, Fifth. New York: Spon Press, 2009, p [11] C. Lv, D. Krishnaraju, G. Konjevod, H. Yu, and H. Jiang, Origami based mechanical metamaterials., Sci. Rep., vol. 4, p. 5979, Jan [12] BS EN ISO 354:2003 Measurement of sound absorption in a reverberation room, [13] P. Newell, Sound, Decibels and Hearing, Recording Studio Design, Third Edit., Elsevier Ltd., 2012, pp [14] T. J. Cox and P. D Antonio, Acoustic, Absorbers and Diffusers, Second Edi. Taylor & Francis, 2009, pp [15] J. Kim, J. Lee, Y. Choi, and D. Jeong, The Effect of an Edge on the Measured Scattering Coefficients in a Reverberation Chamber based on ISO , Build. Acoust., vol. 19, no. 1, pp , ISBN:
The effect of an edge on the measured scattering coefficients in a reverberation chamber based on ISO
Proceedings of the International Symposium on Room Acoustics, ISRA 2010 29-31 August 2010, Melbourne, Australia The effect of an edge on the measured scattering coefficients in a reverberation chamber
More informationROOM ACOUSTICS THREE APPROACHES 1. GEOMETRIC RAY TRACING SOUND DISTRIBUTION
ROOM ACOUSTICS THREE APPROACHES 1. GEOMETRIC RAY TRACING. RESONANCE (STANDING WAVES) 3. GROWTH AND DECAY OF SOUND 1. GEOMETRIC RAY TRACING SIMPLE CONSTRUCTION OF SOUND RAYS WHICH OBEY THE LAWS OF REFLECTION
More informationSome issues in measurement of the random-incidence scattering coefficients in a reverberation room
Proceedings of ACOUSTICS 6 20-22 November 6, Christchurch, New Zealand Some issues in measurement of the random-incidence scattering coefficients in a reverberation room Young-Ji Choi, Dae-Up Jeong and
More informationA suggested method to be used to measure scattering coefficients of full scale samples.
A suggested method to be used to measure scattering coefficients of full scale samples. Ronald Sauro a Michael Vargas b NWAA Labs, Inc 25132 Rye Canyon Loop Santa Clarita, CA 91355 USA ABSTRACT In attempting
More informationNon-linear decays in simple spaces and their possible exploitation
akutek www.akutek.info PRESENTS Non-linear decays in simple spaces and their possible exploitation by Mike Barron ABSTRACT Standard room acoustic theory is based on the assumption that the sound field
More informationThe Effect of Scenery on the Stage Acoustic Conditions in a Theatre
Department of The Built Environment Building Physics - Acoustics Research group The Effect of Scenery on the Stage Acoustic Conditions in a Theatre Master Thesis Ni Putu Amanda Nitidara Supervisors: Ir.
More informationBasic Study on a Laboratory Measurement Method of the Normal-Incidence Scattering Coefficient
Basic Study on a Laboratory Measurement Method of the Normal-Incidence Scattering Coefficient Hyojin LEE, Tetsuya SAKUMA Graduate School of Frontier Sciences, University of Tokyo, Kashiwa, Japan. 1. Introduction
More informationThe practical application of G and C 50 in classrooms
The practical application of G and C 50 in classrooms Jack Harvie-Clark 1, Nicholas Dobinson 2 1 Apex Acoustics Ltd 2 Apex Acoustics Ltd ABSTRACT Reverberation time remains the primary indicator of room
More informationExperimental and numerical studies on reverberation characteristics in a rectangular room with unevenly distributed absorbers
Acoust. Sci. & Tech. 7, () PAPER Experimental and numerical studies on reverberation characteristics in a rectangular room with unevenly distributed absorbers Yosuke Yasuda ;, Ayumi Ushiyama ;y, Shinichi
More informationUsing an ambisonic microphone for measurement of the diffuse state in a reverberant room
Proceedings of 20 th International Congress on Acoustics, ICA 2010 23-27 August 2010, Sydney, Australia Using an ambisonic microphone for measurement of the diffuse state in a reverberant room John Bassett
More informationTest Report. RI Acoustic Lab. Measurement of Sound Absorption Coefficient for RockDelta NoiStop Noise Barrier. 20 Feb. 07
Test Report RI Acoustic Lab Measurement of Sound Absorption Coefficient for RockDelta NoiStop Noise Barrier 20 Feb. 07 Title Measurement of Sound Absorption Coefficient for RockDelta NoiStop Noise Barrier
More informationDIFFUSIVITY AND ITS SIGNIFICANCE TO EFFECTIVE SEAT ABSORPTION IN CONCERT HALLS
akutek DIFFUSIVITY AND ITS SIGNIFICANCE TO EFFECTIVE SEAT ABSORPTION IN CONCERT HALLS M Skålevik 1,2, Bølstadtunet 7, 3430 Spikkestad, Norway 1 ) 2 ) Brekke & Strand akustikk email:msk@bs-akustikk 1 INTRODUCTION
More informationEFFECT OF MEMBRANE SURFACE TENSION AND BACKED-AIR GAP DISTANCE ON SOUND ABSORPTION CHARACTERISTICS
EFFECT OF MEMBRANE SURFACE TENSION AND BACKED-AIR GAP DISTANCE ON SOUND ABSORPTION CHARACTERISTICS M. H. Zainulabidin 1, L. M. Wan 1, A. E. Ismail 1, M. Z. Kasron 1 and A. S. M. Kassim 2 1 Faculty of Mechanical
More informationRecent topics in acoustic scattering coefficient determination for wall surfaces
Toronto, Canada International Symposium on Room Acoustics 2013 June 9-11 Recent topics in acoustic scattering coefficient determination for wall surfaces Tetsuya Sakuma (sakuma@k.u-tokyo.ac.jp) Hyojin
More informationREVERBERATION TIME, STRENGTH & CLARITY IN SCHOOL HALLS: MEASUREMENTS AND MODELLING
REVERBERATION TIME, STRENGTH & CLARITY IN SCHOOL HALLS: MEASUREMENTS AND MODELLING J Harvie-Clark Apex Acoustics Ltd, Gateshead UK D Wallace Apex Acoustics Ltd, Gateshead UK N Dobinson Apex Acoustics Ltd,
More informationKeywords: absorption coefficient, reverberation time, Zernike Moments, Radial Basic Function(RBF), Sabine equation.
Development of the System to Predict the Absorption Coefficient of the Room Acoustic Using Zernike Moments and Radial Basic Function (RBF) Mohamad Hafiz Abu Bakar 1, a *, Abd Kadir Mahamad 2,b, Sharifah
More informationISO 354 INTERNATIONAL STANDARD. Acoustics Measurement of sound absorption in a reverberation room
INTERNATIONAL STANDARD ISO 354 Second edition 2003-05-15 Acoustics Measurement of sound absorption in a reverberation room Acoustique Mesurage de l'absorption acoustique en salle réverbérante Reference
More informationSOUND ABSORPTION OF SLAT STRUCTURES FOR PRACTICAL APPLICATIONS
SOUND ABSORPTION OF SLAT STRUCTURES FOR PRACTICAL APPLICATIONS J Riionheimo N Näveri T Lokki H Möller Aalto University, Akukon Ltd. Helsinki, Finland Akukon Ltd. Helsinki, Finland Aalto University, Espoo,
More informationDELTA Test Report. DANAK TEST Reg. no Measurement of Sound Absorption Coefficient for Kvadrat Soft Cells Wall Panel Type Time
We help ideas meet the real world DELTA Test Report DANAK TEST Reg. no. 100 Measurement of Sound Absorption Coefficient for Kvadrat Soft Cells Wall Panel Type Time Client: Kvadrat Soft Cells A/S Page 1
More informationRoom acoustic modelling techniques: A comparison of a scale model and a computer model for a new opera theatre
Proceedings of the International Symposium on Room Acoustics, ISRA 2010 29-31 August 2010, Melbourne, Australia Room acoustic modelling techniques: A comparison of a scale model and a computer model for
More informationACOUSTIC CLARITY AND AUDITORY ROOM SIZE PERCEPTION. Densil Cabrera 1. Sydney, NSW 2006, Australia
ICSV14 Cairns Australia 9-12 July, 2007 ACOUSTIC CLARITY AND AUDITORY ROOM SIZE PERCEPTION Densil Cabrera 1 1 Faculty of Architecture, Design and Planning, University of Sydney Sydney, NSW 2006, Australia
More informationAcoustics of the Louis Armstrong Theatre
Grand Valley State University ScholarWorks@GVSU Student Summer Scholars Undergraduate Research and Creative Practice 2015 Acoustics of the Louis Armstrong Theatre Bailey Groendyke Grand Valley State University
More informationREPORT ON THE DETERMINATION OF SOUND ABSORPTION COEFFICIENTS OF WOVEN IMAGE ECHO PANEL 7MM TESTED WITH A 20MM AIR GAP IN A REVERBERATION ROOM.
REPORT ON THE DETERMINATION OF SOUND ABSORPTION COEFFICIENTS OF WOVEN IMAGE ECHO PANEL 7MM TESTED WITH A 20MM AIR GAP IN A REVERBERATION ROOM. Testing Procedure: AS ISO 354-2006 Testing Laboratory: Client:
More informationSTUDY ON ROUGHNESS COEFFICIENT AT NATURAL CHANNEL
STUDY ON ROUGHNESS COEFFICIENT AT NATURAL CHANNEL ZARINA MD. ALI 1, NUR HUSNA ABDUL KARIM 2, MOHD ADIB MOHAMAD RAZI 3 1,2,3 Department of Water and Environmental Engineering Faculty of Civil and Environmental
More informationChapter 3 Room acoustics
Chapter 3 Room acoustics Acoustic phenomena in a closed room are the main focal problems in architectural acoustics. In this chapter, fundamental theories are described and their practical applications
More informationCepstral Deconvolution Method for Measurement of Absorption and Scattering Coefficients of Materials
Cepstral Deconvolution Method for Measurement of Absorption and Scattering Coefficients of Materials Mehmet ÇALIŞKAN a) Middle East Technical University, Department of Mechanical Engineering, Ankara, 06800,
More informationMeasurement of sound absorption coefficient for Fraster felt SpaceCover
DELTA Test Report TEST Reg. no. 100 Measurement of sound absorption coefficient for Fraster felt SpaceCover Performed for Fraster ApS Project no.: I100645 Page 1 of 9 27 November 2014 DELTA Venlighedsvej
More informationDELTA Test Report. Measurement of sound absorption coefficient for 15 mm Fraster felt Plus acoustic panels with mounting depth 45 mm
DELTA Test Report TEST Reg. no. 100 Measurement of sound absorption coefficient for 15 mm Fraster felt Plus acoustic panels with mounting depth 45 mm Performed for Fraster ApS DANAK 100/2275 Project no.:
More informationReverberation time, mean free path and sound absorption in concert halls
19 th INTERNATIONAL CONGRESS ON ACOUSTICS MADRID, -7 SEPTEMBER 007 Reverberation time, mean free path and sound absorption in concert halls PACS: 43.55.Fw, 43.55.Br Hidaka Takayuki and Nishihara Noriko
More informationChapter 2. Room acoustics
Chapter 2. Room acoustics Acoustic phenomena in a closed room are the main focal problems in architectural acoustics. In this chapter, fundamental theories are described and their practical applications
More informationProceedings of Meetings on Acoustics
Proceedings of Meetings on Acoustics Volume 19, 13 http://acousticalsocietyorg/ ICA 13 Montreal Montreal, Canada - 7 June 13 Architectural Acoustics Session paab: Dah-You Maa: His Contributions and Life
More informationFESI DOCUMENT A5 Acoustics in rooms
FESI DOCUMENT A5 Acoustics in rooms FileName: A5 Acoustics in rooms - English version.pdf o o Abstract: The first theory developed was Sabine\'s formula (1902) and it is the basis of the so-called \"classic
More informationDesign and Acoustics Brought into Harmony
Acoustics and sound absorption General principles Design and Acoustics Brought into Harmony Acoustics Brochure values Acoustics and sound absorption General principles Table of Contents Page Principles
More informationAvailable online at ScienceDirect. Energy Procedia 78 (2015 ) th International Building Physics Conference, IBPC 2015
Available online at www.sciencedirect.com ScienceDirect Energy Procedia 78 (2015 ) 128 133 6th International Building Physics Conference, IBPC 2015 Sound insulation of building elements at low frequency:
More informationStudy of Wenger Audience Seating Chair Absorption. Ron Freiheit
Study of Wenger Audience Seating Chair Absorption Ron Freiheit January 22, 2002 Study of Wenger Audience Seating Chair Absorption Purpose The purpose of this project was to evaluate the acoustical performance
More informationProceedings of Meetings on Acoustics
Proceedings of Meetings on Acoustics Volume 19, 2013 http://acousticalsociety.org/ ICA 2013 Montreal Montreal, Canada 2-7 June 2013 Architectural Acoustics Session 1pAAa: Advanced Analysis of Room Acoustics:
More informationAbsorption boundary conditions for geometrical acoustics
Absorption boundary conditions for geometrical acoustics Cheol-Ho Jeong a) Acoustic Technology, Department of Electrical Engineering, Technical University of Denmark, DK-800, Kongens Lyngby, Denmark Defining
More informationLABORATORY MEASUREMENTS OF THE SOUND ABSORPTION COEFFICIENTS OF OSCAR EVO-PANELS
Report No. L/3237 Page 1 of 8 for Oscar Acoustics Michaels Lane Ash Kent TN15 7HT Dated: 24 July 2012 LABORATORY MEASUREMENTS OF THE SOUND ABSORPTION COEFFICIENTS OF OSCAR EVO-PANELS Report Author: M Sawyer
More informationDELTA Test Report. Measurement of Sound Absorption for AqFlex ON, one Sample as a discrete Object. Performed for Flex Acoustics
DELTA Test Report TEST Reg. no. 100 Measurement of Sound Absorption for AqFlex ON, one Sample as a discrete Object Performed for Flex Acoustics Project no.: T202611 Page 1 of 7 21 January 2013 DELTA Venlighedsvej
More informationSound Reflection from Overhead Stage Canopies Depending on Ceiling Modification
ARCHIVES OF ACOUSTICS Vol.37,No.2, pp.213 218(2012) Copyright c 2012byPAN IPPT DOI: 10.2478/v10168-012-0028-1 Sound Reflection from Overhead Stage Canopies Depending on Ceiling Modification Tadeusz KAMISIŃSKI,
More informationLABORATORY MEASUREMENTS OF THE SOUND ABSORPTION OF CLASSICTONE 700 ASTM C Type E Mounting. Test Number 2
LABORATORY MEASUREMENTS OF THE SOUND ABSORPTION OF CLASSICTONE 700 ASTM C423-01 Type E Mounting Date of Test: 27/11/2009 Report Author: Mark Simms Test Number 2 Report Number 1644 Report Number 1644 Page
More informationMapping the sound field of a 400 seat theatre
Mapping the sound field of a 400 seat theatre Michael. Ermanna) School of Architecture + Design Virginia Polytechnic Institute and State University Blacksburg VA 24060 USA M. R. F. Kidnerb) and D. Mennittc)
More information4.2 MODELLING OF SOUND FIELDS IN ROOMS. OVERVIEW
CHAPTER 4 Room acoustics 4.1 INTRODUCTION In talking about the concept of room acoustics we shall include all aspects of the behaviour of sound in a room, covering both the physical aspects as well as
More informationREPORT ON THE DETERMINATION OF SOUND ABSORPTION COEFFICIENTS OF WOVEN IMAGE ECHO PANEL 24MM TESTED WITH NO AIR GAP MEASURED IN A REVERBERATION ROOM.
RMIT University Building 1 Level 1 Room 1 124 La Trobe Street Melbourne VIC 3000 Australia GPO Box 2476V Melbourne VIC 3001 Australia Tel. +61 3 9925 2000 Fax +61 3 9925 2000 www.rmit.edu.au REPORT ON
More informationD. BARD, J. NEGREIRA DIVISION OF ENGINEERING ACOUSTICS, LUND UNIVERSITY
Room Acoustics (2) (VTAF01) D. BARD, J. NEGREIRA DIVISION OF ENGINEERING ACOUSTICS, LUND UNIVERSITY Parameters: Importance T30, EDT: Reverberation T60 = 2*T30 D50: Clarity of speech C80: Clarity of music
More informationLaser scanning vibrometry measurements on a light weight building element
Laser scanning vibrometry measurements on a light weight building element N.B. Roozen, M. Rychtáriková, Katholieke Universiteit Leuven, Laboratory for Acoustics and Thermal Physics (ATF), Department of
More informationNoise in enclosed spaces. Phil Joseph
Noise in enclosed spaces Phil Joseph MODES OF A CLOSED PIPE A 1 A x = 0 x = L Consider a pipe with a rigid termination at x = 0 and x = L. The particle velocity must be zero at both ends. Acoustic resonances
More informationArchitectural Acoustics Prof. Shankha Pratim Bhattacharya Department of Architecture and Regional Planning Indian Institute of Technology, Kharagpur
Architectural Acoustics Prof. Shankha Pratim Bhattacharya Department of Architecture and Regional Planning Indian Institute of Technology, Kharagpur Lecture 10 Application of Reverberation Time Good morning,
More informationDepartment of Applied Acoustics, Salford University, Salford M5 4WT, England
1 Comment on "Predicting theater chair absorption from reverberation chamber measurements" [J. Acoust. Soc. Am. 91, 1514-1524 (1992)] W. J. Davies *, Y. W. Lam and R. J. Orlowski Department of Applied
More informationinter.noise 2000 The 29th International Congress and Exhibition on Noise Control Engineering August 2000, Nice, FRANCE
Copyright SFA - InterNoise 2000 1 inter.noise 2000 The 29th International Congress and Exhibition on Noise Control Engineering 27-30 August 2000, Nice, FRANCE I-INCE Classification: 7.2 LABORATORY MEASUREMENT
More informationAcoustic response in non-diffuse rooms
Acoustic response in non-diffuse rooms Jack Harvie-Clark Apex Acoustics, Gateshead, United Kingdom. Nicholas Dobinson Apex Acoustics, Gateshead, United Kingdom. Richard Hinton Apex Acoustics, Gateshead,
More informationConsultancy Report Ref: 9383-R01
Consultancy Report Ref: 9383-R01 Submitted to: Prepared by: Mr Tim Simmons The Woolley Shepherd Secret Meadow Weekmoor Milverton Taunton TA4 1QE John Fithyan Laboratory Manager Approved for issue by: Andy
More informationTHE EFFECTS OF ABSORBER ATTACHMENT LOCATION ON VIBRATION RESPONSE OF SIMPLY SUPPORTED PLATE
THE EFFECTS OF ABSORBER ATTACHMENT LOCATION ON VIBRATION RESPONSE OF SIMPLY SUPPORTED PLATE Muhammad Mohamed Salleh 1 and Izzuddin Zaman 1,2 1 Faculty of Mechanical and Manufacturing Engineering, 2 Structural
More informationLaboratory and In Situ Sound Absorption Measurement under a Synthetized Diffuse Acoustic Field: a Case Study on Five Materials
Laboratory and In Situ Sound Absorption Measurement under a Synthetized Diffuse Acoustic Field: a Case Study on Five Materials Olivier Robin, Celse Kafui Amedin, Alain Berry, Noureddine Atalla, Olivier
More informationInvestigation of the Correlation between Late Lateral Sound Level and Total Acoustic Absorption, and an Overview of a Related Subjective Study
Proceedings of the International Symposium on Room Acoustics, ISRA 2010 29-31 August 2010, Melbourne, Australia Investigation of the Correlation between Late Lateral Sound Level and Total Acoustic Absorption,
More informationModeling and simulation of windows with noise mitigation and natural ventilation
Modeling and simulation of windows with noise mitigation and natural ventilation Xiang YU ; Fangsen CUI ; ze-tiong TAN 2 ; Kui YAO 3 Institute of High Performance Computing, A*TAR, ingapore 2 Building
More informationThis is a repository copy of The effect of acoustic diffusers on room mode decay.
This is a repository copy of The effect of acoustic diffusers on room mode decay. White Rose Research Online URL for this paper: http://eprints.whiterose.ac.uk/101635/ Proceedings Paper: Angus, J A S,
More informationReflection and absorption coefficients for use in room acoustic simulations
Downloaded from orbit.dtu.dk on: May 1, 018 Reflection and absorption coefficients for use in room acoustic simulations Jeong, Cheol-Ho Published in: Proceedings of Spring Meeting of the Acoustical Society
More informationFabric STREAMER pro. Measurement of sound absorption in a reverberation room according to EN ISO 354. Test Report No. M111250/04
Müller-BBM GmbH Robert-Koch-Str. 11 82152 Planegg bei München Telephone +49(89)85602 0 Telefax +49(89)85602 111 www.muellerbbm.de M.Eng. Philipp Meistring Telephone +49(89)85602 228 Philipp.Meistring@mbbm.com
More informationISO INTERNATIONAL STANDARD
INTERNATIONAL STANDARD ISO 140-6 Second edition 1998-08-15 Acoustics Measurement of sound insulation in buildings and of building elements Part 6: Laboratory measurements of impact sound insulation of
More informationINFLUENCE OF TIME-VARIANCE IN AUDITORIUM ON IMPULSE RESPONSE MEASUREMENT
INFLUENCE OF TIME-VARIANCE IN AUDITORIUM ON IMPULSE RESPONSE MEASUREMENT PACS: 43.55.MC Satoh Fumiaki* 1 ; Nagayama Mitsuru* 1 ; Tachibana Hideki* 2 *1 Chiba Institution of Technology Tsudanuma 2-17-1,
More informationRoom Acoustics Experimental Study: Characterization of the Sound Quality in a New Built Church
Room Acoustics Experimental Study: Characterization of the Sound Quality in a New Built Church J. Quartieri*, S. D Ambrosio, C. Guarnaccia*, G. Iannone* * Department of Physics E. Caianiello, Faculty of
More informationACOUSTIC PHENOMENA ASSOCIATED TO THE AUDIENCE
ACOUSTIC PHENOMENA ASSOCIATED TO THE AUDIENCE PACS REFERENCE: 43.55 Br Ivana Rossell, Cristina Vicent Enginyeria i Arquitectura La Salle, Universitat Ramon Llull. Pg. Bonanova, 8 (08022) Barcelona Spain
More informationREVIEW OF ACOUSTIC CHARACTERISTICS OF MATERIALS USING IMPEDANCE TUBE
REVIEW OF ACOUSTIC CHARACTERISTICS OF MATERIALS USING IMPEDANCE TUBE Niresh J. 1, Neelakrishnan S. 1, Subharani S. 2, Kannaian T. 3 and Prabhakaran R. 1 1 Department of Automobile Engineering, PSG College
More informationTFI Report Sound Absorption Impact Sound Insulation
TFI Report 481380-01 Sound Absorption Impact Sound Insulation Customer NEWSPEC CARPET (NINGBO) CO. LTD Cevin Yindong South Road NO. 399 315100 Ningbo CHINA VR Product textile floor covering This report
More informationACOUSTICS 1.01 Pantone 144 U & Pantone 5405 U
ACOUSTICS 1.01 CONTENT 1. INTRODUCTION 3 2. WHAT IS SOUND? 4 2.1 Sound 4 2.2 Sound Pressure 5 2.3 The Decibel Scale 5 2.4 Sound Pressure Increase For Muliple Sound Sources 6 2.5 Frequency 7 2.6 Wavelength
More informationCOMPARISON OF A MULTI-PURPOSE HALL WITH THREE WELL-KNOWN CONCERT HALLS ABSTRACT SOMMAIRE
Canadian Acoustics! Acoustique Canadienne 19(2) 3-10 (1991 ) Research article / Article de recherche COMPARISON OF A MULTI-PURPOSE HALL WITH THREE WELL-KNOWN CONCERT HALLS J.S. Bradley Institute for Research
More informationMeasurement of Acoustic Properties of light weight concrete SL-Deck
DELTA Test Report TEST Reg. no. 100 Measurement of Acoustic Properties of light weight concrete SL-Deck Performed for Abeo A/S Project no.: I100486 Page 1 of 25 30 June 2014 DELTA Venlighedsvej 4 2970
More informationLoudspeaker Choice and Placement. D. G. Meyer School of Electrical & Computer Engineering
Loudspeaker Choice and Placement D. G. Meyer School of Electrical & Computer Engineering Outline Sound System Design Goals Review Acoustic Environment Outdoors Acoustic Environment Indoors Loudspeaker
More informationFabric Corsica. Measurement of sound absorption in a reverberation room according to EN ISO 354. Test Report No. M111250/16
Müller-BBM GmbH Robert-Koch-Str. 11 82152 Planegg bei München Telephone +49(89)85602 0 Telefax +49(89)85602 111 www.muellerbbm.de M. Eng. Philipp Meistring Telephone +49(89)85602 228 Philipp.Meistring@mbbm.com
More informationFabric Dazzle 6086 Manufacturer Carnegie Fabrics
Müller-BBM GmbH Robert-Koch-Str. 11 82152 Planegg bei München Telephone +49(89)85602 0 Telefax +49(89)85602 111 www.muellerbbm.de Dipl.-Ing. (FH) Dominik Reif Telephone +49(89)85602 3566 Dominik.Reif@mbbm.com
More informationLABORATORY MEASUREMENTS OF THE REDUCTION OF TRANSMITTED IMPACT NOISE PANETTI OVERLAID BY CONCRETE FLOORING
Report No. L/3194 Page 1 of 8 for EA Mimarlik Insaat Teknolojileri San.ve. Tic.Ltd.Sti 1420/3 Sokak NO. 22 Kizilkanat Silesi D Blok D.12 Alsancak Izmir Turkey Dated: 18 July 2011 LABORATORY MEASUREMENTS
More informationISSUES ON THE REVERBERATION ROOM METHOD FOR MEASURING THE SCATTERING COEFFICIENTS -BORTHER SETTING AND REVOLUTION OF TEST SAMPLE-
ISSUES ON THE REVERBERATION ROOM METHOD FOR MEASURING THE SCATTERING COEFFICIENTS -BORTHER SETTING AND REVOLUTION OF TEST SAMPLE- Hyojin LEE 1 ; Yuzo TSUCHIYA 2 ; Tetsuya SAKUMA 3 1,2,3 Graduate School
More informationCOMPARISON OF THE METHODS TO CALIBRATE THE DIFFUSE FIELD SENSITIVITY OF LABORATORY STAND- ARD MICROPHONE
COMPARISON OF THE METHODS TO CALIBRATE THE DIFFUSE FIELD SENSITIVITY OF LABORATORY STAND- ARD MICROPHONE Wan-Ho Cho, Hyu-Sang Kwon, and Ji-Ho Chang Korea Research Institute of Standards and Science, Center
More informationEvaluation of standards for transmission loss tests
Evaluation of standards for transmission loss tests M. Cassidy, R. K Cooper, R. Gault and J. Wang Queen s University Belfast, School of Mechanical and Aerospace Engineering, Ashby Building, Stranmillis
More informationLABORATORY MEASUREMENT OF SOUND ABSORPTION OF SONOGLASS SPRAY-ON TREATMENT IN THREE CONFIGURATIONS
LABORATORY MEASUREMENT OF SOUND ABSORPTION OF SONOGLASS SPRAY-ON TREATMENT IN THREE CONFIGURATIONS Prepared for: MONOGLASS INC. 922-1200 West 73rd Avenue Vancouver, BC, Canada V6P 6G5 Prepared by: THE
More informationFrom a profiled diffuser to an optimized absorber
From a profiled diffuser to an optimized absorber Wu, T, Cox, TJ and Lam, YW http://dx.doi.org/10.1121/1.429596 Title Authors Type URL From a profiled diffuser to an optimized absorber Wu, T, Cox, TJ and
More informationEstimation and Determination Correction for the Area Effect of the Sound Absorber Material
Estimation and Determination Correction for the Area Effect of the Sound Absorber Material M.G. El-Shaarawy 1, Mohamed Abd-elbasseer, Abd-elfattah A. Mahmoud *, and Rabab. S. youssif 1 Faculty of Science
More informationTFI Report Sound Absorption Impact Sound Insulation
TFI Report 462257-01 Sound Absorption Impact Sound Insulation Customer Desso B.V. Taxandriaweg 15 5142 PA Waalwijk NETHERLANDS Product textile floor covering This report includes 2 pages and 2 annex(es)
More informationINVESTIGATIONS INTO THE PERFORMANCE OF THE REVERBERATION CHAMBER OF THE INTEGRATED ACOUSTICS LABORATORY. A Thesis Presented to The Academic Faculty
INVESTIGATIONS INTO THE PERFORMANCE OF THE REVERBERATION CHAMBER OF THE INTEGRATED ACOUSTICS LABORATORY A Thesis Presented to The Academic Faculty By Tina M. Famighetti In Partial Fulfillment Of the Requirements
More informationModeling Measurement Uncertainty in Room Acoustics P. Dietrich
Modeling Measurement Uncertainty in Room Acoustics P. Dietrich This paper investigates a way of determining and modeling uncertainty contributions in measurements of room acoustic parameters, which are
More informationDetermination of absorption characteristic of materials on basis of sound intensity measurement
Determination of absorption characteristic of materials on basis of sound intensity measurement R. Prascevic, A. Milosevic, S. Cvetkovic To cite this version: R. Prascevic, A. Milosevic, S. Cvetkovic.
More informationUSING STATISTICAL ROOM ACOUSTICS FOR ANALYSING THE OUTPUT SNR OF THE MWF IN ACOUSTIC SENSOR NETWORKS. Toby Christian Lawin-Ore, Simon Doclo
th European Signal Processing Conference (EUSIPCO 1 Bucharest, Romania, August 7-31, 1 USING STATISTICAL ROOM ACOUSTICS FOR ANALYSING THE OUTPUT SNR OF THE MWF IN ACOUSTIC SENSOR NETWORKS Toby Christian
More informationMeasurements of the Sound Absorption Coefficient of Auditorium Seats for Various Geometries of the Samples
ARCHIVES OF ACOUSTICS Vol.37,No.4, pp.483 488(2012) Copyright c 2012byPAN IPPT DOI: 10.2478/v10168-012-0060-1 Measurements of the Sound Absorption Coefficient of Auditorium Seats for Various Geometries
More informationFabric Sport. Measurement of sound absorption in a reverberation room according to EN ISO 354. Test Report No. M102794/02
Müller-BBM GmbH Robert-Koch-Str. 11 82152 Planegg bei München Germany Telephone +49(89)85602 0 Telefax +49(89)85602 111 www.muellerbbm.de Dipl.-Ing. (FH) Eva Müller Telephone +49(89)85602 3206 Eva.Mueller@mbbm.com
More informationWitold MIKULSKI. Central Institute for Labour Protection National Research Institute Czerniakowska 16, Warszawa, Poland;
ARCHIVES OF ACOUSTICS Vol. 38, No. 2, pp. 177 183 (2013) Copyright c 2013 by PAN IPPT DOI: 10.2478/aoa-2013-0020 Method of Determining the Sound Absorbing Coefficient of Materials within the Frequency
More informationLast time: small acoustics
Last time: small acoustics Voice, many instruments, modeled by tubes Traveling waves in both directions yield standing waves Standing waves correspond to resonances Variations from the idealization give
More informationODEON APPLICATION NOTE Calibration of Impulse Response Measurements
ODEON APPLICATION NOTE Calibration of Impulse Response Measurements Part 2 Free Field Method GK, CLC - May 2015 Scope In this application note we explain how to use the Free-field calibration tool in ODEON
More informationCurtain fabric type Ace Manufacturer Kvadrat A/S
Müller-BBM GmbH Robert-Koch-Str. 11 82152 Planegg bei München Telephone +49(89)85602 0 Telefax +49(89)85602 111 www.muellerbbm.com M. Eng. Philipp Meistring Telephone +49(89)85602 228 Philipp.Meistring@mbbm.com
More informationModelling of sound elds in enclosed spaces with absorbent room surfaces. Part I: performance spaces
Applied Acoustics 58 (1999) 1±18 Modelling of sound elds in enclosed spaces with absorbent room surfaces. Part I: performance spaces S.M. Dance*, B.M. Shield Acoustics Group, School of Engineering Systems
More informationPhysics 115 Lecture 20. Reflection and Reverberation March 9, 2018
Physics 115 Lecture 20 Reflection and Reverberation March 9, 2018 1 Attenuation by absorption The wave intensity decreases due to internal friction among the molecules of the medium Attenuation is described
More informationExperimental investigation on varied degrees of sound field diffuseness in enclosed spaces
22 nd International Congress on Acoustics ` Isotropy and Diffuseness in Room Acoustics: Paper ICA2016-551 Experimental investigation on varied degrees of sound field diffuseness in enclosed spaces Bidondo,
More informationTFI Report Sound Absorption Impact Sound Insulation
TFI Report 471194-01 Sound Absorption Impact Sound Insulation Customer egetaepper a/s Industrivej Nord 25 7400 Herning DENMARK Product textile floor covering This report includes 2 pages and 2 annex(es)
More informationTHERMAL AND ACTIVATION ENERGY OF RENEWABLE POLYMER AFTER UV IRRADIATION
THERMAL AND ACTIVATION ENERGY OF RENEWABLE POLYMER AFTER UV IRRADIATION Nik Normunira Mat Hassan and Anika Zafiah M. Rus Sustainable Polymer Engineering, Advanced Manufacturing and Material Center (AMMC),
More informationAcoustic particle velocity enabled methods to assess room acoustics
Acoustic particle velocity enabled methods to assess room acoustics Emiel Tijs a Microflown Technologies, Arnhem, the Netherlands Jonathan Botts Rensselaer Polytechnic Institute, New York, US / Microflown
More information1238. Relation between reduction of weighted impact sound pressure level and shape of small size specimen of floating floor construction
1238. Relation between reduction of weighted impact sound pressure level and shape of small size specimen of floating floor construction Vidmantas Dikavičius 1, Kęstutis Miškinis 2, Karolis Banionis 3,
More informationPaseo Recoletos, nº Madrid TEST REPORT
LGAI LGAI Technological Center, S.A. Campus de la UAB Apartado de Correos 18 E - 08193 BELLATERRA (Barcelona) T +34 93 567 20 00 F +34 93 567 20 01 www.applus.com 9/LE766 Bellaterra: June 5 th, 2012 File
More informationLaboratory for Acoustics. Determination of the sound absorption (reverberation room method) of curtains, manufacturer Vescom BV
Laboratory for Acoustics Determination of the sound absorption (reverberation room method) of curtains, manufacturer Vescom BV Report number A 3012-2E-RA-002 d.d. February 4, 2016 Laboratory for Acoustics
More informationTechnical Report. Project. The Laboratory Determination of The Random Incidence sound Absorption Coefficient of VertiQ Panels.
Technical Report Ref Number C/21387/R01a Date 06 April 2011 Project The Laboratory Determination of The Random Incidence sound Absorption Coefficient of VertiQ Panels Prepared for Rockfon Rockwool A/S
More informationTesting Procedure: AS ISO
RMIT University Building 1 Level 1 Room 1 124 La Trobe Street Melbourne VIC 3000 Australia GPO Box 2476V Melbourne VIC 3001 Australia Tel. +61 3 9925 2000 Fax +61 3 9925 2000 www.rmit.edu.au REPORT ON
More information