Pachyderm Acoustic

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Comment by Robin Richardson on March 15, 2022 at 7:37am

Hi all, hope you are well.

I'm new to using Pachyderm and could use some assistance—when using the Particle Animation part of the Rhino plugin, the simulated particles don't appear to use the selected color scale—instead taking on the color of the currently selected layer. This only happens in the screen captures saved by using the Animate button; the particles are colored correctly in the viewport when using the Preview button.

Advice? I'm running Rhino 6 Windows.

Comment by Arthur van der Harten on February 15, 2022 at 12:51pm

Hi Jimmy,

Good of you to notice, and scrutinize the results. The version you are using doesn't accomodate noise barriers very well. What it needs is an acoustic screen calculation. I've been working on one, but it's not quite ready yet. However, email me if you'd like to play with it anyhow.

Info@orase.org

Arthur

Comment by Jimmy Pristudor on February 15, 2022 at 9:51am

Hi all!

I am quite new to pachyderm, and hope that you could help me out with my thesis project. I am trying to set up a relatively simple simulation for a road side noise barrier.

I am using 'visualising pachyderm rays', and converting them into cloud particles later. I use a point to generate vertors from (vector star).

If I do not create a closed off Room, only the rays that actually hit something (the floor or the barrier) will be shown. Not the rays that move towards the sky.

If I create a closed box, I get closer to what I want. But the rays will bounce down from the 'sky'.

I have tried to make the irrelevant room surfaces (sides and upper surface) 'terminating surfaces' in the PachVisRays, but this did not change anything. I assumed this would terminate any ray that hits this surface...

I'd love to hear from you! Cheers!

Comment by Arthur van der Harten on January 16, 2022 at 7:56am

Vincent,
Thanks so much for sharing that. I didn't even know that video existed. It's fun to see people experiment... That said, I don't recommend his approach. You bypass a lot of Pachyderm's most valuable functionality doing what he did.

For example, did you know that using the animation tool in the rhino interface, the particles share energy with nearby particles, making it easier to visually detect things like focusing? Additionally, nowhere in his script due it account for surface absorption.

Furthermore, he is using a geometrical model of a diffuser to stimulate scattering explicitly. That's not the way it should be done. That might be somewhat accurate for extremely high frequencies, but in real life, the very large wavelengths of sound also influence the movement of sound energy.

There is a tool in the finite volume method section of Pachyderm that can be used to stimulate that more accurately.

I'm not sure why your result is different, but like I said, ORASE had nothing to do with the creation of that video, so it's not so easy for me to help out with that one. I suggest you try the rhino interface instead. Type 'pachyderm_animation into the command prompt. There may be a tutorial about how to use it on the ORASE website too.

Arthur

Comment by Arthur van der Harten on January 16, 2022 at 7:46am

Hi Ishita,
Sorry - I never saw your question. You can do a lot in Pachyderm, and it's difficult to answer such an open ended question. Why don't you try experimenting and coming back with more specific questions.
Arthur

Comment by Vincent Dissaux on January 16, 2022 at 4:18am

Hi All, I'm trying to follow a youtube tutorial about acoustic simulation using Grasshopper and pachyderm ( this one https://www.youtube.com/watch?v=t9t5jnw6XTk&t=17s ). As you can see at 25:00 of the tutorials every particle disappears, mine stay stuck on the last wall they hit.. If one of you guys has any advice about that I thank you in advance. 

Comment by Ishita Sahai on October 1, 2021 at 11:54pm

Hi, what all components of sound can be calculated in pachyderm? how can we calculate noise absorption?

Comment by Arthur van der Harten on August 15, 2021 at 9:42pm

Hi Harsh,

I think it depends on what you are doing. There are some systems that calculate the absorption coefficient of some commonly used systems in the absorption designer, such as a grid of perforations.

If you need something more bespoke than that, Pachyderm may not be the right tool at this time.

Arthur

Comment by HarshS on June 24, 2021 at 5:37am

Hello,
Is it possible to simulate and study resonance based phenomena such as Helmholtz resonator or Passive Destructive Interference in Pachyderm; and get the Absorption Coefficient across the frequency band?

Comment by Ander Perez on May 10, 2021 at 2:00am

Hello,

 

I am trying to do some mapping calculations, but every time I start a calculatoin (Settings: Specific Ray Count, default settings), receiver displacement: Audience) Rhino crushes.

 

I've tried this in Rhino 6 and Rhino 7, but it keeps crushing. Is there something I am missing? Thanks for your help!

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