importing model to ecotect anaysis. .3ds geometry--ecotect
TRANSCRIPT
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!
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
Conclusion: Analysis will work but cylindrical geometry will be a mess as ecotect converts it into triangular components.
Cylinder computed by Ecotect becomes more complex triangular geometry
Avoid Complex Geometry as far as possible.
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
Acoustical Analysis
Set Sound Source and Reflectors (ceilings)
Generate Rays
Reflector position and orientation calculationAcoustical Analysis
Trial 1Default
Trial 1
12m
dia=30m
Trial 1Default
12m
dia=30m
Trial 1Default
12m
dia=30m
Trial 1Default
dia=30m
12m
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.
Trial 2Lowering ceiling
Decreased by 3m
9m
dia=30m
Trial 2Lowering ceiling
Decreased by 3m
9m
dia=30m
Decreased by 3m
Trial 2Lowering ceiling
9m
dia=30m
Trial 3Increased by 3m
15m
dia=30m
Trial 3
15m
dia=30m
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.
Material assignment to the Reflectors at height of 12m
Acoustical Analysis
Assigning all reflectors as Acoustical Tile.
Table to feed different NRC Values
Feeding different Absorptive value for different frequency.
Adding Material-NRC.03
dia=30m
12m
Adding Material-NRC.03
12m
dia=30m
Adding Material-NRC.61
dia=30m
12m
Adding Material-NRC.85
dia=30m
12m
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.
Adding Material-NRC.56
12m
dia=30m
Adding Material-NRC.56
12m
dia=30m
Results or Output from Ecotect Analysis.Acoustical Analysis
Acoustical Response
Sound Decay for different frequency
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
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)