Pachyderm Acoustic

Information

Pachyderm is a plugin largely used by Designers and Scientists alike to simulate acoustics in buildings, rooms, cities, and other settings.

Website: http://www.orase.org
Location: Earth
Members: 192
Latest Activity: on Tuesday

Hello Pachyderm Users,

We are going through an exciting period, including the startup of an organization to support the growth of Pachyderm, and extend the educational agenda of the project. In the next few weeks, we will be submitting our long-form 501(c)3 application, which will give us the rights of a not-for-profit organization established in the state of Connecticut. As part of the transition, we are phasing out the old website. The new site will be up in the next few weeks, and you can find it at:

www.orase.org

We are looking forward to the next phase of this project, and we hope that you will be there with us to learn and continue to support us!

kind regards,

Arthur van der Harten

Executive Director

Open Research in Acoustical Science and Education

ORASE

Discussion Forum

Very cool, but Error "Index was outside the bounds of the array." 5 Replies

Hi, I am intrigued by Pachyderm. Thanks for creating and sharing it. Oddly, I am experimenting with not a room but a portable semi-transmission-line speaker enclosure. I want to see what's going on…Continue

Started by Brenda EM. Last reply by Michael Dubby on Tuesday.

Could not load file or assembly 'Pachyderm_Acoustic, Version=2.6.0.14. 2 Replies

Hi Arthur,I'm experiencing a persistent issue with the Pachyderm components in Grasshopper. While the plugin works correctly when launching a simulation directly from Rhino, as soon as I open…Continue

Tags: issue, installation

Started by valentina. Last reply by valentina Jun 20.

Impulse response (IR) and auralization grasshopper components 1 Reply

Hi Arthur,Thank you for your software as usual, it is a great tool !I tried my model using the Pachyderm Rhino interface to auralize and export some impulse responses, and it works like a charm…Continue

Started by Taha B. Last reply by Taha B Mar 25.

Sound Simulation_ Reverberation Time calculation_Inconsistant Results 1 Reply

Good morning all,I am currently working on the calculation of the reverberation time of different closed spaces. I have a closed geometry (simplified model of the Hypogeum in Malta), and what I did…Continue

Started by Alejandro Estrella. Last reply by Michael Dubby Dec 21, 2024.

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Comment by Daniel Horta on June 5, 2022 at 3:32pm: Hi Arthur, hope everything is fine.

I was wondering if you could explain how we should use the "Variegation (characteristic dimension)" slider. I searched online but didn't manage to find anything about this specific term in articles about the use of scattering coefficients in simulations. Thanks in advance. Cheers!

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?