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Sound Analysis of an Amphitheatre

Sound Analysis of an Amphitheatre. Importing Model to Ecotect Anaysis . .3ds geometry-- Ecotect. .3ds geometry-- Ecotect. Conclusion: Analysis will retard or take long time. Revit and Ecotect. Tag the object carefully in Revit for gbxml filetype !.

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Sound Analysis of an Amphitheatre

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  1. Sound Analysis of an Amphitheatre

  2. Importing Model to EcotectAnaysis.

  3. .3ds geometry--Ecotect

  4. .3ds geometry--Ecotect

  5. Conclusion: Analysis will retard or take long time.

  6. Revit and Ecotect Tag the object carefully in Revit for gbxmlfiletype!

  7. Revit model tagged as shaded part and untagged as un-shaded part. To import gbxml format from revit for analysis, whole part should be completely tagged

  8. Conclusion: Analysis will work but cylindrical geometry will be a mess as ecotect converts it into triangular components.

  9. Avoid Complex Geometry as far as possible. Cylinder computed by Ecotect becomes more complex triangular geometry

  10. More Simplified geometry for Ecotect Model Carefully deleted the outer cylindrical from imported xml file and created cylinder surface on ecotect so that analysis is done smoothly.

  11. Acoustical Analysis

  12. Set Sound Source and Reflectors (ceilings)

  13. Generate Rays

  14. Reflector position and orientation calculation Acoustical Analysis

  15. Trial 1Default

  16. Trial 1 12m dia=30m

  17. Trial 1Default 12m dia=30m

  18. Trial 1Default 12m dia=30m

  19. Trial 1Default 12m dia=30m

  20. Conclusion of Trial 1 • More REVEB sound was detected. • Hence need to modify -Geometry -Orientation (incident angle etc.) • Material quality is kept as default. • Hence parameters to control in the analysis are Reflectors (ceilings) property.

  21. Trial 2Lowering ceiling Decreased by 3m 9m dia=30m

  22. Trial 2Lowering ceiling Decreased by 3m 9m dia=30m

  23. Trial 2Lowering ceiling Decreased by 3m 9m dia=30m

  24. Trial 3 Increased by 3m 15m dia=30m

  25. Trial 3 15m dia=30m

  26. Conclusion of Trials 2 and 3 • As we change the heights of the ceiling, just above the stage, quality changes drastically • As we lower more noise is observed • As we higher the ceiling good quality is observed for same directed ray generated.

  27. Acoustical Analysis Material assignment to the Reflectors at height of 12m

  28. Assigning all reflectors as Acoustical Tile.

  29. Table to feed different NRC Values

  30. Feeding different Absorptive value for different frequency.

  31. Adding Material-NRC.03 12m dia=30m

  32. Adding Material-NRC.03 12m dia=30m

  33. Adding Material-NRC.61 12m dia=30m

  34. Adding Material-NRC.85 12m dia=30m

  35. Conclusion of different NRC Values • For Higher Noise Reduction Coefficients (NRC 0.6 and above) most of the sound waves are observed that leads to Dryness of Sound which seems to be bad of an amphitheatre. • For lower NRC(0.3) we have variety of sound variation which is not desired • Hence selected NRC 0.56 which is 12 mm Mineral Fiber Material which is also fire resistant.

  36. Adding Material-NRC.56 12m dia=30m

  37. Adding Material-NRC.56 12m dia=30m

  38. Acoustical Analysis Results or Output from Ecotect Analysis.

  39. Acoustical Response

  40. Sound Decay for different frequency

  41. TOTAL SABINE NOR-ER MIL-SE FREQ. ABSPT. RT(60) RT(60) RT(60) ------- -------- ------- ------- ------- 63Hz: 104.349 3.35 2.80 4.87 125Hz: 110.039 3.21 2.70 1.70 250Hz: 206.346 1.53 1.39 1.13 500Hz: 519.030 0.86 0.68 0.57 1kHz: 579.543 0.80 0.60 0.49 2kHz: 485.506 0.86 0.71 0.62 4kHz: 390.240 1.04 0.90 0.82 8kHz: 390.551 1.02 0.90 0.82 16kHz: 308.554 1.14 1.07 0.99 • Reverberation Graph

  42. STATISTICAL ACOUSTICS - 18 Room Volume: 4070.390 m3 Surface Area: 761.794 m2 Occupancy: 680 (850 x 80%) Optimum RT (500Hz - Speech): 0.99 s Optimum RT (500Hz - Music): 1.65 s Volume per Seat: 4.789 m3 Minimum (Speech): 5.329 m3 Minimum (Music): 9.129 m3 Most Suitable: Norris-Eyring (Highly absorbant) Selected: Sabine (Uniformly distributed)

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