Hi @Arthur !
Why can’t I get any result after calculation? Please help, thanks!
Neko_Box.3dm (1.6 MB)
Neko_Box.3dm (1.6 MB)
Hi,
The reason you are not getting a result is because you have put a receiver inside a box with probably a dozen surfaces around it, and have not even set transmission loss or transparency for any of the materials… Rightly, Pachyderm did exactly what you asked it to. It simulated a condition where rays from the source could not possibly meet the receiver.
However, I need to tell you that this is the wrong solution for testing the sound isolation of multiple layers of material. There are wave phenomena that the ray-tracing method does not (can not) simulate correctly. You can specify a precalculated or measured transmission loss for the assembly, and then model the box as 1 layer only. However, if you do that, and you already know what the transmission loss of the box is, do you need to do the model at all?
Food for thought.
Also, you are using an older version of Pachyderm. Please update to Rhino 8 and get the latest version from the Package Manager. You won’t regret it. Much faster, and much better version…
Arthur
Hi @Arthur !
Thanks for ur reply. So base on your reply, I come up with 2 questions:
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About Pachyderm: so I need to insert transmission ratio in the software, if i only have Sound reduction index, can I transmit into transmission ratio?
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Outside of pachyderm, how can I pre-calculate the transmission loss of multi layer materials. Is there any recommended literature I can look up?
Lastly, for the Rhino 8 part, I will try it.
Again, thank you very very much!
Hi,
Sound reduction index is pretty much interchangeable with transmission loss. You can use that.
There is a software called insul which is pretty good for calculating transmission loss of wall assemblies. It’s very complicated to do it on your own, and unfortunately error prone without a lot of comparison with known assemblies.
Kind regards,
Arthur