Importing Model to Ecotect Anaysis.

.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 calculation Acoustical Analysis

Trial 1 Default

Trial 1 12m dia=30m

Trial 1 Default 12m dia=30m

Trial 1 Default 12m dia=30m

Trial 1 Default 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 2 Lowering ceiling Decreased by 3m 9m dia=30m

Trial 2 Lowering ceiling Decreased by 3m 9m dia=30m

Decreased by 3m Trial 2 Lowering ceiling 9m dia=30m

Trial 3 Increased 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-SE FREQ. ABSPT. RT(60) RT(60) RT(60) Hz: Hz: Hz: Hz: kHz: kHz: kHz: kHz: kHz:

STATISTICAL ACOUSTICS - 18 Room Volume: m3 Surface Area: m2 Occupancy: 680 (850 x 80%) Optimum RT (500Hz - Speech): 0.99 s Optimum RT (500Hz - Music): 1.65 s Volume per Seat: m3 Minimum (Speech): m3 Minimum (Music): m3 Most Suitable: Norris-Eyring (Highly absorbant) Selected: Sabine (Uniformly distributed)