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 ID: 777746
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Slide1
Sound Analysis
of an
Amphitheatre
Slide2Importing Model to Ecotect
Anaysis.
Slide3.3ds geometry--
Ecotect
Slide4.3ds geometry--
Ecotect
Slide5Conclusion: Analysis will retard or take long time.
Slide6Revit and Ecotect
Tag the object carefully in
Revit
for
gbxml
filetype
!
Slide7Revit
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
Slide8Conclusion: Analysis will work but cylindrical geometry will be a mess as
ecotect
converts it into triangular components.
Slide9Cylinder computed by
Ecotect
becomes more complex triangular geometry
Avoid Complex Geometry as far as possible.
Slide10Carefully 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
Slide11Acoustical Analysis
Slide12Set Sound Source and Reflectors (ceilings)
Slide13Generate Rays
Slide14Reflector position and orientation calculation
Acoustical Analysis
Slide15Trial 1
Default
Slide16Trial 1
12m
dia
=30m
Slide17Trial 1
Default
12m
dia
=30m
Slide18Trial 1
Default
12m
dia
=30m
Slide19Trial 1
Default
dia
=30m
12m
Slide20Conclusion 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.
Slide21Trial 2
Lowering ceiling
Decreased by 3m
9m
dia
=30m
Slide22Trial 2
Lowering ceiling
Decreased by 3m
9m
dia
=30m
Slide23Decreased by 3m
Trial 2
Lowering ceiling
9m
dia
=30m
Slide24Trial 3
Increased by 3m
15m
dia
=30m
Slide25Trial 3
15m
dia
=30m
Slide26Conclusion 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 observedAs we higher the ceiling good quality is observed for same directed ray generated.
Slide27Material
assignment to the Reflectors
at height of 12m
Acoustical Analysis
Slide28Assigning all reflectors as
Acoustical Tile.
Slide29Table to feed different NRC Values
Slide30Feeding different Absorptive value for different frequency
.
Slide31Adding Material-NRC.03
dia
=30m
12m
Slide32Adding Material-NRC.03
12m
dia
=30m
Slide33Adding Material-NRC.61
dia
=30m
12m
Slide34Adding Material-NRC.85
dia
=30m
12m
Slide35Conclusion 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.
Slide36Adding Material-NRC.56
12m
dia
=30m
Slide37Adding Material-NRC.56
12m
dia
=30m
Slide38Results or Output from
Ecotect
Analysis.
Acoustical Analysis
Slide39Acoustical Response
Slide40Sound Decay for different frequency
Slide41Reverberation Graph
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
Slide42STATISTICAL ACOUSTICS - 18 Room
Volume: 4070.390 m3
Surface Area: 761.794 m2Occupancy: 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)