ACOUSTICS IN SPORTS HALLSresearch on the acoustical behaviour of Frenger panels                                           ...
ACOUSTICS IN SPORTS HALLS                                Yvonne Wattez 1360809 graduation projectresearch on the acoustica...
ACOUSTICS IN SPORTS HALLS                                Yvonne Wattez 1360809 graduation projectresearch on the acoustica...
ACOUSTICS IN SPORTS HALLS                                Yvonne Wattez 1360809 graduation projectresearch on the acoustica...
ACOUSTICS IN SPORTS HALLS                                 Yvonne Wattez 1360809 graduation projectresearch on the acoustic...
ACOUSTICS IN SPORTS HALLS                                 Yvonne Wattez 1360809 graduation projectresearch on the acoustic...
ACOUSTICS IN SPORTS HALLS                                 Yvonne Wattez 1360809 graduation projectresearch on the acoustic...
ACOUSTICS IN SPORTS HALLS                                Yvonne Wattez 1360809 graduation projectresearch on the acoustica...
ACOUSTICS IN SPORTS HALLS                                Yvonne Wattez 1360809 graduation projectresearch on the acoustica...
ACOUSTICS IN SPORTS HALLS                                Yvonne Wattez 1360809 graduation projectresearch on the acoustica...
ACOUSTICS IN SPORTS HALLS                                 Yvonne Wattez 1360809 graduation projectresearch on the acoustic...
ACOUSTICS IN SPORTS HALLS                                                                  Yvonne Wattez 1360809 graduatio...
ACOUSTICS IN SPORTS HALLS                                 Yvonne Wattez 1360809 graduation projectresearch on the acoustic...
ACOUSTICS IN SPORTS HALLS                                                                  Yvonne Wattez 1360809 graduatio...
ACOUSTICS IN SPORTS HALLS                                           Yvonne Wattez 1360809 graduation projectresearch on th...
ACOUSTICS IN SPORTS HALLS                                         Yvonne Wattez 1360809 graduation projectresearch on the ...
ACOUSTICS IN SPORTS HALLS                                          Yvonne Wattez 1360809 graduation projectresearch on the...
ACOUSTICS IN SPORTS HALLS                                Yvonne Wattez 1360809 graduation projectresearch on the acoustica...
ACOUSTICS IN SPORTS HALLS                                Yvonne Wattez 1360809 graduation projectresearch on the acoustica...
ACOUSTICS IN SPORTS HALLS                                Yvonne Wattez 1360809 graduation projectresearch on the acoustica...
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P1 presentation Yvonne Wattez 11/11/11

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P1 presentation Yvonne Wattez 11/11/11

  1. 1. ACOUSTICS IN SPORTS HALLSresearch on the acoustical behaviour of Frenger panels Presentation P1 11/11/2011 Graduation project of Yvonne Wattez Student nr. 1360809 Building Technology | Green Building Innovation Faculty of Architecture | TU Delft Mentor 1: Martin Tenpierik Mentor 2: still unknown
  2. 2. ACOUSTICS IN SPORTS HALLS Yvonne Wattez 1360809 graduation projectresearch on the acoustical behaviour of Frenger panels P1 presentation 11/11/2011 Why? I like sports. 2
  3. 3. ACOUSTICS IN SPORTS HALLS Yvonne Wattez 1360809 graduation projectresearch on the acoustical behaviour of Frenger panels P1 presentation 11/11/2011 Why? I like sports. I like acoustics. 3
  4. 4. ACOUSTICS IN SPORTS HALLS Yvonne Wattez 1360809 graduation projectresearch on the acoustical behaviour of Frenger panels P1 presentation 11/11/2011 Why? I like sports. I like acoustics. Acoustics in sports halls seem to be a problem. 4
  5. 5. ACOUSTICS IN SPORTS HALLS Yvonne Wattez 1360809 graduation projectresearch on the acoustical behaviour of Frenger panels P1 presentation 11/11/2011 Problem? Complaints of PE teachers: - voice problems, - hearing problems, - tiredness. Mainly caused by bad acoustics of sports halls. - reverberation time, - background noise, - speechintelligibility. Teachers need to shout to make themselves heard. Pictures: Protest action in Rijssen - Holten. [source: tcturbantia 27 sept 2010] 5
  6. 6. ACOUSTICS IN SPORTS HALLS Yvonne Wattez 1360809 graduation projectresearch on the acoustical behaviour of Frenger panels P1 presentation 11/11/2011 Standards Based on reverberation time [T] and sound pressure level. Average: between 1,2 and 1,8 sec Max: between 1,5 and 2,2 sec depending on size and volume. [source: ISA Sport, Handboek sportaccomodaties] picture: sports hall in Amstelveen [source:www.sportbedrijfamstelveen.nl] 6
  7. 7. ACOUSTICS IN SPORTS HALLS Yvonne Wattez 1360809 graduation projectresearch on the acoustical behaviour of Frenger panels P1 presentation 11/11/2011Sabine Reverberation time Calculations vs. measurements. Calculations: formula of Sabine. [source: ISA-Sport (2002)] 7
  8. 8. ACOUSTICS IN SPORTS HALLS Yvonne Wattez 1360809 graduation projectresearch on the acoustical behaviour of Frenger panels P1 presentation 11/11/2011Eyring Reverberation time Calculations vs. measurements. Calculations: formula of Sabine. Other formulas to calculate [T]: Eyring, 8
  9. 9. ACOUSTICS IN SPORTS HALLS Yvonne Wattez 1360809 graduation projectresearch on the acoustical behaviour of Frenger panels P1 presentation 11/11/2011Kosten Reverberation time Calculations vs. measurements. Calculations: formula of Sabine. Other formulas to calculate [T]: Eyring, Kosten, 9
  10. 10. ACOUSTICS IN SPORTS HALLS Yvonne Wattez 1360809 graduation projectresearch on the acoustical behaviour of Frenger panels P1 presentation 11/11/2011Fitzroy Reverberation time Calculations vs. measurements. Calculations: formula of Sabine. Other formulas to calculate [T]: Eyring, Kosten, Fitzroy. 10
  11. 11. ACOUSTICS IN SPORTS HALLS Yvonne Wattez 1360809 graduation projectresearch on the acoustical behaviour of Frenger panels P1 presentation 11/11/2011Formulas compared: Reverberation timesports hall Nieuwleusen: stone walls Calculations vs. measurements. Calculations: formula of Sabine. Other formulas to calculate [T]: Eyring, Kosten, Fitzroy. Chart: formulas show considerable difference compared to the measurement.sports hall Schijndel: perforated steel panels on walls 11
  12. 12. ACOUSTICS IN SPORTS HALLS Yvonne Wattez 1360809 graduation projectresearch on the acoustical behaviour of Frenger panels P1 presentation 11/11/2011 Reverberation time Nagalmtijd Calculations vs. measurements. Gymzaal (21 x 12 x 6 m) High peek around 500Hz could be Meting vs berek ening caused by flutters. 2.5 2.0 Tgem = 1,6 s 1.5 RT [s] Tgem = 1,0 s 1.0 0.5 Tgem = 0,8 s 0.0 125 250 500 1000 2000 4000 f [Hz] T20-meting T-Sabine norm [source: Vugts, J. (2008) LBP|SIGHT via nvbv.org] 12
  13. 13. ACOUSTICS IN SPORTS HALLS Yvonne Wattez 1360809 graduation projectresearch on the acoustical behaviour of Frenger panels P1 presentation 11/11/2011 Flutters Reflecting sound in between parallel walls. De nagalmtijd als te berek in het ontwerp 90 m = 2 x zaallengte [source: Vugts, J. (2008) LBP|SIGHT via nvbv.org] Sportzaal (32x24x7,8 m) – Norm: Tgem = 1,5 s; Tmax/fb = 2,1 s 13
  14. 14. ACOUSTICS IN SPORTS HALLS Yvonne Wattez 1360809 graduation projectresearch on the acoustical behaviour of Frenger panels P1 presentation 11/11/2011 Sound absorption Remarkable differences in a: ‘Berekende’ geluidabsorptiecoëfficiënt De nagalmtijd in relatie t (not only in frequencies with possible flutters) Gymzaal (21 x 12 x 6 m) - stonevan de geluidabsorptie walls, Meting vs berek ening - soundSporthal (48x28x9 m) absorbing panels. 0.6 α ‘aanwezig’ (seem to behave ‘better’ = 1,9 s; Tmax/fb = 2,7 s - Norm: Tgem in low frequencies) 0.5 0.4 The sound absorbing panels seem α ‘norm’ to behave different than expected α [-] 0.3 from laboratory measurements. 0.2 α ‘gemeten’ 0.1 0.0 125 250 500 1000 2000 4000 3 varianten met gelijke hoeveelheid geluidabs f [Hz] • Variant 1: Wandabsorptie rondom bovens Research question!Wandabsorptie rondom onderst • Variant 2: T20-meting T-Sabine norm • Variant 3: Wandabsorptie twee hele wand [source: Vugts, J. (2008) LBP|SIGHT via nvbv.org] 14
  15. 15. ACOUSTICS IN SPORTS HALLS Yvonne Wattez 1360809 graduation projectresearch on the acoustical behaviour of Frenger panels P1 presentation 11/11/2011Research question Frenger panels are a common type of perforated steel absorption panels.Why do Frenger sound absorbing ceiling/wall panels seem tobehave differently in absorption coefficient in sports halls thanexpected from laboratory test results? 15
  16. 16. ACOUSTICS IN SPORTS HALLS Yvonne Wattez 1360809 graduation projectresearch on the acoustical behaviour of Frenger panels P1 presentation 11/11/2011Objective1. Determining whether or not a difference in soundabsorption behaviour of Frenger panels exists between practicalapplications and lab situations.2. If no difference exist, understanding what causes thedifferences in results.3. If a difference exists, understanding what causes thisdifference in behaviour. 16
  17. 17. ACOUSTICS IN SPORTS HALLS Yvonne Wattez 1360809 graduation projectresearch on the acoustical behaviour of Frenger panels P1 presentation 11/11/2011HypothesesIf there is no difference in sound absorbing behaviour:• A Frenger panel behaves differently in practice than in a laboratory situation on absorption coefficient because of adifference in sound field.If there is a difference in sound absorbing behaviour:• A Frenger panel behaves differently in practice than in a laboratory situation on absorption coefficient, the differentplacement of the panel in the laboratory than in practice hasinfluence on the result.• A Frenger panel behaves differently in practice than in a laboratory situation on absorption coefficient because thebacking construction is not taken into account in the laboratorymeasurement, it has influence on the result. 17
  18. 18. ACOUSTICS IN SPORTS HALLS Yvonne Wattez 1360809 graduation projectresearch on the acoustical behaviour of Frenger panels P1 presentation 11/11/2011Method Method 18
  19. 19. ACOUSTICS IN SPORTS HALLS Yvonne Wattez 1360809 graduation projectresearch on the acoustical behaviour of Frenger panels P1 presentation 11/11/2011Timelinedecision on more specific topic andsecond mentor 19
  20. 20. ACOUSTICS IN SPORTS HALLS Yvonne Wattez 1360809 graduation projectresearch on the acoustical behaviour of Frenger panels P1 presentation 11/11/2011 Questions? 20

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