sound analysis of an amphitheatre
DESCRIPTION
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 !. - PowerPoint PPT PresentationTRANSCRIPT
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Sound Analysis of an Amphitheatre
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Importing Model to Ecotect Anaysis.
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.3ds geometry--Ecotect
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.3ds geometry--Ecotect
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Conclusion: Analysis will retard or take long time.
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Revit and Ecotect
Tag the object carefully in Revit for gbxml filetype!
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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
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Conclusion: Analysis will work but cylindrical geometry will be a mess as ecotect converts it into triangular components.
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Cylinder computed by Ecotect becomes more complex triangular geometry
Avoid Complex Geometry as far as possible.
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Carefully deleted the outer cylindrical from imported xml file and created cylinder surface on ecotect so that analysis is done smoothly.
More Simplified geometry for Ecotect Model
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Acoustical Analysis
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Set Sound Source and Reflectors (ceilings)
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Generate Rays
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Reflector position and orientation calculationAcoustical Analysis
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Trial 1Default
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Trial 1
12m
dia=30m
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Trial 1Default
12m
dia=30m
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Trial 1Default
12m
dia=30m
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Trial 1Default
dia=30m
12m
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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.
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Trial 2Lowering ceiling
Decreased by 3m
9m
dia=30m
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Trial 2Lowering ceiling
Decreased by 3m
9m
dia=30m
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Decreased by 3mTrial 2
Lowering ceiling
9m
dia=30m
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Trial 3Increased by 3m
15m
dia=30m
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Trial 3
15m
dia=30m
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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.
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Material assignment to the Reflectors at height of 12m
Acoustical Analysis
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Assigning all reflectors as Acoustical Tile.
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Table to feed different NRC Values
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Feeding different Absorptive value for different frequency.
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Adding Material-NRC.03
dia=30m
12m
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Adding Material-NRC.03
12m
dia=30m
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Adding Material-NRC.61
dia=30m
12m
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Adding Material-NRC.85
dia=30m
12m
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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.
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Adding Material-NRC.56
12m
dia=30m
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Adding Material-NRC.56
12m
dia=30m
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Results or Output from Ecotect Analysis.Acoustical Analysis
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Acoustical Response
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Sound Decay for different frequency
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Reverberation Graph
TOTAL SABINE NOR-ER MIL-SEFREQ. ABSPT. RT(60) RT(60) RT(60)------- -------- ------- ------- ------- 63Hz: 104.349 3.35 2.80 4.87125Hz: 110.039 3.21 2.70 1.70250Hz: 206.346 1.53 1.39 1.13500Hz: 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 0.8216kHz: 308.554 1.14 1.07 0.99
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STATISTICAL ACOUSTICS - 18 Room
Volume: 4070.390 m3Surface Area: 761.794 m2Occupancy: 680 (850 x 80%)Optimum RT (500Hz - Speech): 0.99 sOptimum RT (500Hz - Music): 1.65 s
Volume per Seat: 4.789 m3Minimum (Speech): 5.329 m3Minimum (Music): 9.129 m3
Most Suitable: Norris-Eyring (Highly absorbant)Selected: Sabine (Uniformly distributed)