algorithmic modeling for Rhino
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Reverberation time is an important acoustic measurement that refers to the time it takes for sound to decay by 60 decibels after the sound source stops. This measurement is essential in spaces like concert halls, auditoriums, and even outdoor environments. It is often calculated using the Sabine or Eyring formula, which takes into account the volume of the space and the surface materials within it. For example, during the Upper Mustang Trek trekkers might notice different reverberation times in the unique natural acoustics of the mountain canyons and caves they pass through, influenced by the surrounding terrain and atmospheric conditions.
Hi,
For reference, this forum doesn't send us everything, but we did receive this one. I'll take a look this evening.
Arthur
Hi,
So why did you assign 10 percent transmission to all surfaces in grasshopper and then hide the wires to that input? You lose 40 percent of the energy in your simulation that way. It took me forever to find that, but I'm pretty sure that's your problem.
Arthur
Hi. Here is what I got for this - much closer to the paper:
{0;0}
125. 0.763982
250. 0.965731
500. 0.84799
1000. 0.857607
2000. 1.126713
4000. 1.442056
{0;1}
125. 0.771627
250. 0.979936
500. 0.846216
1000. 0.856514
2000. 1.137329
4000. 1.44285
{0;2}
125. 0.775357
250. 0.98732
500. 0.860795
1000. 0.871164
2000. 1.156493
4000. 1.456735
{0;3}
125. 0.783173
250. 1.002847
500. 0.863712
1000. 0.8734
2000. 1.163863
4000. 1.461097
It is very close to the results from the paper, except at 2000 and 4000 hertz. Now a perfect match is unlikely because of the effects of monte carlo algorithms. Still, the divergence at high frequencies suggests a difference in algorithms. Pachyderm follows non-diffuse effects very deep into the impulse response, so if this is happening in this room, and we know for certain that what is in the paper is correct, then I would argue that there is more scattering at those frequencies, and Pachyderm is more sensitive to the discrepancy in input data.
I hope this helps. Please watch your grasshopper file more carefully in the future. If the transmission on all surfaces was an attempt at a shortcut - don't ever do that again. It amounts to having the wrong absorption coefficients.
Thanks.
Arthur
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