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

12m Trial 1

Default

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

9m

Trial 2

Lowering ceiling

9m

Trial 2

Lowering ceiling

9m

Trial 3

Increased by 3m 15m

15m

Trial 3

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

dia=30m

12m

Adding Material-NRC.03

dia=30m

12m

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

dia=30m

12m

Adding Material-NRC.56

dia=30m

12m

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 ABSPT.

------- 104.349

110.039

206.346

519.030

579.543

485.506

390.240

390.551

308.554

SABINE RT(60) ------ 3.35

3.21

1.53

0.86

0.80

0.86

1.04

1.02

1.14

NOR-ER MIL-SE RT(60) ------ RT(60) ------ 2.80

2.70

1.39

0.68

0.60

4.87

1.70

1.13

0.57

0.49

0.71

0.90

0.90

1.07

0.62

0.82

0.82

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)