I am surprised by that, but it is the crux of the issue in modelling the various panel materials in use.
I went by the 5 value used for MDF and bumped it up a bit, but you're suggesting a huge leap...
And then we take the raw material and apply coatings....🤷♂️
We need a full blown lab 😵💫😵💫
Eucy
I only chose this large panel to test Steve's statement on the SPL effects of clamping... It's way too big for my practical use but it does maybe indicate an advantage held by large panels in smoothing out the FR
Eucy
Oh wow thanks Dave, no pressure as I'm sure I can borrow a PC or it may work on my windows workaround I just haven't tried yet. Looking forward to having a play with it and trying different placement options non physically.
Have you had any contact with Ben Zenker of Xcite? I'm not sure if he views the DML full range forum or partakes under another name. I'm sure your program would be of interest to him as I remember from one of his videos he manually tried many many placements to model panel behaviour.
Thank you Eric
Do you know what is this transparent variant of PS used as protective glass for frames? I think it exists also in non transparent white in DIY stores.
Christian
In my experience..acrylic Christian
acrylic
Picture frame glass and acrylic both come in clear finishes. This choice is common for most artwork and photography, especially for pieces with vibrant colors. It offers full, window-like clarity, allowing all the detail to pop right out of the frame.
I also thought so, until I read what Wiki says:
"Polystyrene (PS) /ˌpɒliˈstaɪriːn/ is a synthetic polymer made from monomers of the aromatic hydrocarbon styrene.[5] Polystyrene can be solid or foamed. General-purpose polystyrene is clear, hard, and brittle. It is an inexpensive resin per unit weight. It is a poor barrier to air and water vapor and has a relatively low melting point.[6] Polystyrene is one of the most widely used plastics, with the scale of its production being several million tonnes per year.[7] Polystyrene is naturally transparent, but can be colored with colorants."
I have never seen transparent polystyrene myself. This is all new to me.
Because it’s transparent! Haha! But seriously, I’m sure you have seen it. You just didn’t realize that that is what it was.
Ikea frame below.
Next step : I will inform about the density. Polystyrene is lighter than acrylic.
Next step : I will inform about the density. Polystyrene is lighter than acrylic.
Sorry if I missed it but are you looking into polystyrene instead of acrylic because it is lighter/less dense? Therefore more sensitivity/SPL?
This is called high impact polystyrene or HIPS and available from plastic suppliers.
This is called high impact polystyrene or HIPS and available from plastic suppliers.
The iOS version is now available on github!
Getting in touch with Ben is on my list. My students and I are still trying to figure out the best way to model the DA exciters we have, so I was hoping to get through all of that first.
Hello Dave,
I would be interested to have a better understanding of how PETTaLS models the exciters. As there are already 2 exciters in the current version, I thought it was a closed topic. Seems not?
Christian
Some exciters, like the two models that are in my software already, are easy to model. Some, like the DAEX32Q-8, behave a little differently. I'm trying to come up with a comprehensive model that works for everything... it might be overkill, though.
The model is still pretty close to Ch.5 from my thesis. It's now probably closer to what's outlined in This paper, but it was pretty hard to make heads or tails of what was going on in those old NXT papers (because they wanted to keep it proprietary, I'm sure).
Thanks Dave! I didn't expect you to do it so fast or at all!
I was more meaning Ben would be interested in using PETTals rather than asking for more exciters to be loaded.
I downloaded the iOS version but it says it can't be opened on my Mac as it says it's damaged and should be moved to the bin, should it work on MacOs or is it for iOS on an IPad? Or is there other software needed to host it? Sorry I couldn't find info on the host program on the Github but I remember there was something needed to run it on Windows?
Thanks again
Eric -
I've been thinking more about the high-frequency schemes, and I think there's more to be said that's difficult to quantify...
One of the perceptually interesting things about sound coming from a panel is that the source really is "distributed" over space, as opposed to a traditional loudspeaker where the size of the driver is normally meant to be much smaller than the wavelength of the reproduced frequency, so that the sound appears to emanate from a single point. The picture below is one example of how modal patterns produce a really distributed acoustic source, the "localized" pattern is somewhat in between, and the PIP pattern is a very localized source. The bottom row of graphs is a nearfield SPL map with the speaker at the bottom center.
The PIP pattern is probably almost always above coincidence, though, which muddies the results a bit.
Yeah, I meant macOS. I renamed the file. I'm mostly an iPhone user so I just had iOS in the back of my mind. Oops!
This is apparently just a problem with macOS not liking third party apps. This worked for me:
https://discussions.apple.com/thread/253714860?sortBy=rank
JoskaNZ,
I'm sure Ben would be interested to try Pettals, but he has his own version of it, I would say. He describes in section 3 the attached paper. It's not something you or I could run, however without pretty expensive software and even more extensive knowledge of how to use it! Dave has put it in a form that is inexpensive (free!) and accessible. It's a great thing.
Eric