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.
Avoid Complex Geometry as far as possible.
Cylinder computed by Ecotect becomes more complex triangular geometry
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.
Acoustical Analysis
Set Sound Source and Reflectors (ceilings)
Generate Rays
Acoustical Analysis
Reflector position and orientation calculation
Trial 1
Default
Trial 1
12m
Trial 1
Default
12m
Trial 1
Default
12m
Trial 1
Default
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 2
Lowering ceiling
Decreased by 3m
9m
Trial 2
Lowering ceiling
Decreased by 3m
9m
Trial 2
Lowering ceiling
Decreased by 3m
9m
Trial 3
Increased by 3m
15m
Trial 3
15m
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.
Acoustical Analysis
Material assignment to the Reflectors
at height of 12m
Assigning all reflectors as Acoustical Tile.
Table to feed different NRC Values
Feeding different Absorptive value for different frequency.
Adding Material-NRC.03
12m
dia=30m
Adding Material-NRC.03
12m
dia=30m
Adding Material-NRC.61
12m
dia=30m
Adding Material-NRC.85
12m
dia=30m
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
Acoustical Analysis
Results or Output from Ecotect Analysis.
Acoustical Response
Sound Decay for different frequency
Reverberation Graph
FREQ.
------63Hz:
125Hz:
250Hz:
500Hz:
1kHz:
2kHz:
4kHz:
8kHz:
16kHz:
TOTAL SABINE NOR-ER MIL-SE
ABSPT. RT(60) RT(60) RT(60)
-------------------------104.349 3.35
2.80
4.87
110.039 3.21
2.70
1.70
206.346 1.53
1.39
1.13
519.030 0.86
0.68
0.57
579.543 0.80
0.60
0.49
485.506 0.86
0.71
0.62
390.240 1.04
0.90
0.82
390.551 1.02
0.90
0.82
308.554 1.14
1.07
0.99
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)