Analysis software for modeling suppressors?

[texan_eagle_scout]

I was doing some web searching yesterday and cane across this forum.

I am thinking about modelling my own can design, but I was looking for what CFD analysis software people have been using. I have found software that analyzes car muffler flow and harmonics, and I have found software that computes flow at a constant rate. Nothing I have come across indicated that anyone other than the big manufacturers like Sig or possibly Ruger are using anything successfully.

Have the members here come across anything?

Here is what I have found so far:

FEA Analysis for acoustics (vehicle exhaust)
https://www.comsol.com/acoustics-module
https://www.comsol.com/livelink-for-solidworks



https://www.comsol.com/model/muffler-wi ... rates-1843

https://www.comsol.com/model/flow-duct-1371

https://www.comsol.com/model/absorptive-muffler-1367




firearm noise tester
http://www.larsondavis.com/products/sou ... dellxt1qpr

[Bendersquint]

Gotta have deeeeeeep pockets to get even a remotely accurate package and then its not really that accurate...will give you an IDEA, thats abot it though.

[Bendersquint]

Reading over the Larson Davis link it is not giving accurate number, not even remotely. Its either catching the trailing end of the shot or the mic is farther away than its supposed to be.

Fastest response time for it is 30ms(according to LD rep), its not fast enough to catch the peak of the noise or meet mil spec requirements.

It can't even measure high enough to accurately document an unsuppressed shot.

Pass on this, definitely not suitable for suppressor testing if you want accurate numbers.

[Capt. Link.]

This should be a good seat.

[silencer_kid]

your local library, online books, fluid dynamics, aerodynamics, and thermodynamics will get you to about 90% of the way there. the other 10% is chomping through stock on your fav machine.
just be sure the garage door is closed and that window has blinds, the ATF will be watching you, and whiterussin is standing by to enforce the laws

all of the LD devices are not suitable, but my ~10yr old $200 dscope is, just need the mic, which i had already posted about, mic with its preamp will be right around $1000.

but check the nasa open source, they might just have something (quiet, its a secret).

[whiterussian1974]

just be sure the garage door is closed and that window has blinds, the ATF will be watching you, and whiterussin is standing by to enforce the laws

but check the nasa open source, they might just have something (quiet, its a secret).

Nasa has excellent info and software.

I'm not looking to stop anyone's fun. Just don't want the 1 in 10,000 to cause gov't to clamp down on the rest of us b/c of foolishly posting Intent to commit Felonies on Net. Do what you want. Just don't publicly post it and encourage others to engage in criminal conspiracies.

I'm about as easy going as it gets. I even supported your interest until your posts b/c grating and inflamitory. But you've turned toxic and you're asking for a taxpayer-funded vacation. A real pity since you are ardently seeking to improve suppressor theory.

[Capt. Link.]

What lathe do you own as the picture is a download from PM.

[silencer_kid]

just be sure the garage door is closed and that window has blinds, the ATF will be watching you, and whiterussin is standing by to enforce the laws

but check the nasa open source, they might just have something (quiet, its a secret).

Nasa has excellent info and software.

I'm not looking to stop anyone's fun. Just don't want the 1 in 10,000 to cause gov't to clamp down on the rest of us b/c of foolishly posting Intent to commit Felonies on Net. Do what you want. Just don't publicly post it and encourage others to engage in criminal conspiracies.

I'm about as easy going as it gets. I even supported your interest until your posts b/c grating and inflamitory. But you've turned toxic and you're asking for a taxpayer-funded vacation. A real pity since you are ardently seeking to improve suppressor theory.

whaaaaaat. using flow analysis software is not a crime. maybe the enforcing-the-laws bit is getting to you?
i dont own a lathe, i dont have anything illegal, i am not engaging in any illegal activities, i am not promoting illegal activities. that said, machine away (legally under F1 of course) until your fingers fall off, which allows you to machine 50,000 can parts for yourself if you want, but at any given time you only have the "incomplete" can, etc. my stock of AL tube and 1" solid AL round is nothing but stock until such time a can part comes of it.

[Capt. Link.]

I was just wondering why a picture of a lathe popped up nothing else.

[whiterussian1974]

just be sure the garage door is closed and that window has blinds, the ATF will be watching you, and whiterussin is standing by to enforce the laws

but check the nasa open source, they might just have something (quiet, its a secret).

I'm not looking to stop anyone's fun. Just don't want the 1 in 10,000 to cause gov't to clamp down on the rest of us b/c of foolishly posting Intent to commit Felonies on Net. Do what you want. Just don't publicly post it and encourage others to engage in criminal conspiracies.

I'm about as easy going as it gets. I even supported your interest until your posts b/c grating and inflamitory. But you've turned toxic and you're asking for a taxpayer-funded vacation. A real pity since you are ardently seeking to improve suppressor theory.

whaaaaaat. using flow analysis software is not a crime. maybe the enforcing-the-laws bit is getting to you?
i dont own a lathe, i dont have anything illegal, i am not engaging in any illegal activities, i am not promoting illegal activities. that said, machine away (legally under F1 of course) until your fingers fall off, which allows you to machine 50,000 can parts for yourself if you want,...

Noone said that software is a crime.

I referred to your posts in various threads where you stated Clear Intent to machine K baffles from a tree in your backyard at a Stated Date and Address. Also your Incitement to Engage in Criminal Conspiracy to Defraud Federal Gov't(SOT), Conspiracy to Subvert NFA(making multiple iterations of silencer parts that can't all fit into the stated tube length on the F1), and Unlawful Use of Interstate Telecommunications to Engage in Criminal Activities(Using Net to Encourage others to bypass NFA). (A quick call to a local FBI Duty Officer would result in many more charges. I just list some of the most obvious.)

But don't let any of THAT stop you. You're great job security for many of us.

Your use of other peoples' addresses, photos of machinery, etc just show that you are a fraud. An irritant that none of us should take seriously. You simply aren't worth the time.

[silencer_kid]

. An irritant that none of us should take seriously. You simply aren't worth the time.

are you talking about 1st amendment rights, or something other? a conspiracy , conspiring to do what exactly.
well, you do know how to use a phone, right? feel free to call my local FBI field office (they already know who i am), please record their laugh back at you, then post it for the rest of us to hear. i'll be patiently waiting.......

and yikes, you can read either. i didnt say make 50,000 baffle that dont fit, now did i. the law is the law, and thankfully there is no timeframe verbiage in the law for a F1 build, so i guess you'll just keep on enforcing whatever laws you are enforcing.

and correct, i should not be taken seriously. simply ignore me and move on, very simple.

[whiterussian1974]

. An irritant that none of us should take seriously. You simply aren't worth the time.

correct, i should not be taken seriously. simply ignore me and move on, very simple.

[silencer_kid]

I was just wondering why a picture of a lathe popped up nothing else.

not hard to understand, it was a as-example pic.

here. let me show you where to find some, right --> here

[a_canadian]

You're feeding the troll WR. Internet rule #14: "Do not feed the trolls... it means they win." The little pissant is truly not worth anyone's time.

[Capt. Link.]

Sorry still can't see any connection between the conversation and a picture of a lathe.If I'm wrong then this should make sense.

[curtistactical]

I was feeling left out.

[whiterussian1974]

If I'm wrong then this should make sense.

I am not now, nor have I ever been a member of HUAC.

[doubloon]

Sorry still can't see any connection between the conversation and a picture of a lathe.If I'm wrong then this should make sense.

There is no logical reason for the picture of the lathe.

[T-Rex]

FIII

[Tony M.]

So there.

[Shanks]

Man I might be new here but god damn you folks really crack me up. You got one feller in here that just wants to beat an unjust system and is worried about another feller talking like a lawyer or somethin' who seems to really belive in the laws set in place. Let me tell you a story about my cousin back in maybe the late to mid 90s. After the Assult Weapons ban in 94. We were botu machinists down in Alabama way back in the sticks. Well ends up George gets involved with some bad folks who were selling coke some not so nice folks north of us. Ends up dumb bastard gets into debt with these folks and as soon as they learn hes a machinist and a gun nut, he goes out and starts making them some of them silly ass SP1s select fire, well sure as s--t about 500 guns into it big brother catchs on. I spent a weekend in lock up being interrogated because they found George shot to death in his shop. Well figures they go on and charge them bikers with the whole damn book. Problem is they only recovered i want to say 150 or so rifles. That means that there are still a few hundred out there and that was one man in the 90s! Now down there there are a ton of solitary, government free community's where people just don't have problems, and if you dont belive that every one of them has a sawn off or a silencer i figure you might just be a fool. A lot of good people do a lot of things some people might think is wrong but they ain't there to hurt no body and they keep their mouth shut and go on with life. Not everyone at the atf is looking out for the free people of America but then again a few are. Instead of cowarding in fear, we need to infiltrate them and make a change for our selfs. I've seen a lot of things in life but im just a simple man and try to walk a line, theres a lot of folks like me and a lot of you out there. I'm not saying that I keep any of that stuff around as I've got to much at stake to be betting the farm at this point. But know this, there's a lot of illegal machine guns, silencers, sbrs and sbss out there. A lot of you might know someone who might have one. Just think to yourselfs, is it your duty to go out and make a call to there local FBI agents office or just leave them alone. The fact that there are so many nfa items out there and communitys willing to keep quite about them scares the hell out of the jack booted thugs that are in the government. The atf now is what the fbi was in the 80 and early 90s. Just do some reading into ruby ridge or waco Texas.

Shanks

[a_canadian]

Well whatever that was Shanks, thanks, it made for a fun reading. But you've left something out. The Internet is not 'free' in the sense that anyone can say anything they like anywhere without consequence. Locally, we have our good host, the owner of Silenertalk, who stands to suffer certain consequences should the BATF or other authorities decide that what's being discussed here is a cause for a certain sort of concern. I'm not resident in the country which hosts this forum, but I do my best to follow the rules such that I will not impinge upon Mr Silvers' (at least I think that's the owner's name) rights to run a civil discussion forum without unwanted authoritarian intervention. When someone like the 'kid' comes along spouting crap like he's been spouting at every opportunity, basically trolling, I have no patience for it in the context of this forum, which has provided and ought to continue to provide a valuable resource for those interested in subjects related to silencersmithing. I have certainly vented my political spleen upon occasion and have taken my smackdowns in turn, s--t happens, but there's no call to be openly recommending illegal activities. It's just not acceptable.

Sorry to hear you lost your cousin George, but hey, deal with the devil you're gonna get bit. Comes a time when a man has to make decisions. If I got myself into a similar pickle I'd be sincerely thinking of relocating my family and maybe changing my name. When you're dead it doesn't matter which side of the moral line you stood on nor how much cash you had on hand. You're just dead.

I happen to be a hobbyist/enthusiast with a bit of machining experience and an airgun hobby to feed, and this forum helps me in certain ways. I try to give back to the forum's members with the odd bit of advice to the best of my ability when baffle questions or related subjects come up. There's no call for misbehaving. The kid is jeopardizing a valued resource. The fact that he hasn't been blocked from participating seems to me either an awfully naive move or a magnanimous one on the part of the forum moderators. Either way, he's causing damage, and his nonsense in this thread is just one of many examples. At his most earnest he demonstrates repeatedly the depth of his ignorance regarding audio technology. At his worst he's inciting dangerous activity which could threaten the freedoms of his readers should they take his words to heart and commit to actions which can not be taken back. Smart people shut the hell up about such things. The kid ain't smart, he's just mouthy.

[Shanks]

Hey there canadian, suppose you aren't the only one whose told me about jt blocking them and there posts, how do you figure I can block their posts?

[silencer_kid]

Sorry still can't see any connection between the conversation and a picture of a lathe.If I'm wrong then this should make sense.

ah, now i understand your Q. after doing all of the reading and understanding, you turn to tour lathe, bridgeport, cnc, press, whatever, to machine away until your carbides are exhausted, so that you have a "complete" can that works for you. i thought it was clear, my bad.

and hah , yeah, i know nothing about audio technology

and you all should re-read my posts, i always say the F1 build should be done legally, so machine away, make 50,000 baffles (for yourself), only have enough to be legal.

[Capt. Link.]

Get it.