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-   -   Achieving The Pneumatics Bshoooo (http://www.chiefdelphi.com/forums/showthread.php?t=136972)

DinerKid 27-04-2015 13:12

Achieving The Pneumatics Bshoooo
 
So one thing has been perplexing me for a while now and I figured I may as well open it up to the community here to find answers.

Some teams have pneumatics that make a beautiful "bshooo" sound when fired. Assuming it was simply a specific solenoid I went around at champs and asked some questions. As in any great mystery the noise could not be replicated. Several teams who made the noise had different solenoids and really couldn't explain why it happened.

Does your robot make this glorious noise? If so what is the secret? I will not sleep until this is resolved.

The magnificent solenoid call can be heard in the video below between 4 and 8 seconds in, as well as various other times.

https://www.youtube.com/watch?v=PtRewwr59d8

Thanks
~DK

Monochron 27-04-2015 13:26

Re: Achieving The Pneumatics Bshoooo
 
Hhm, my guess would be that it is a certain bore cylinder combined with a certain flow rate. Our 2" bore cylinders did not make the bwoosh sound that you are talking about, they did more of a "ksshhhchung!"

Alan Anderson 27-04-2015 15:05

Re: Achieving The Pneumatics Bshoooo
 
Might it be due to flow restrictors installed on the cylinder's exhaust? They can easily turn a "PSSHUNK" into a "FSSSSH" sound.

Jared Russell 27-04-2015 15:11

Re: Achieving The Pneumatics Bshoooo
 
I usually hear this with very small bore cylinders with no flow restrictors. In other words, I think it has to do with the velocity of the cylinder rod.

But I could be totally wrong.

orangemoore 27-04-2015 15:13

Re: Achieving The Pneumatics Bshoooo
 
Quote:

Originally Posted by Jared Russell (Post 1477161)
I usually hear this with very small bore cylinders with no flow restrictors. In other words, I think it has to do with the velocity of the cylinder rod.

But I could be totally wrong.

It seems like the noise comes from a small bore, short stroke cylinder supplied with high pressure (60psi)

Electronica1 27-04-2015 15:13

Re: Achieving The Pneumatics Bshoooo
 
I have noticed different solenoids and manifolds make unique sounds when they exhaust.

216Robochick288 27-04-2015 15:15

Re: Achieving The Pneumatics Bshoooo
 
Im going to be not useful right now but this has to be the best thread on CD today...

JesseK 27-04-2015 15:27

Re: Achieving The Pneumatics Bshoooo
 
We use this for our brake on our Tote Lift (not used at champs). It makes that same distinct sound when extending. Not sure if all pancake cylinders do that.

Poseidon5817 27-04-2015 15:33

Re: Achieving The Pneumatics Bshoooo
 
Quote:

Originally Posted by DinerKid (Post 1477017)
The magnificent solenoid call

^This

ASmith1675 27-04-2015 15:35

Re: Achieving The Pneumatics Bshoooo
 
Our pneumatics always seem to make a lot of noise, the prime example being 2013 when you could hear our pneumatics actuate from just about anywhere in the arena.

Midwest Regional QF 3-1

We're the corner climber... not exactly sure what caused that, but those were 1.5" bored 2.5 foot stroke that year. (We were and are slightly crazy)

We use the SMC base stations and double action solenoids through Vex.

Matt_Boehm_329 27-04-2015 15:38

Re: Achieving The Pneumatics Bshoooo
 
This thread has given me an amazing idea. Now to convince the team to use it for next year

MaGiC_PiKaChU 27-04-2015 15:49

Re: Achieving The Pneumatics Bshoooo
 
we did a whistle for our pneumatic actuated claw... We could hear it from the 3rd floor at the Edward Jones dome...
the whistle was made of tubing with an angle cut in it, in the solenoid exhaust, and weights only a few grams.
You can here it here when our claw opens - http://www.thebluealliance.com/match/2015qcmo_qf1m4

Edit: it does not make 118's Bshooo sound, but more of a Tchoo/Tchuiii

GeeTwo 27-04-2015 16:38

Re: Achieving The Pneumatics Bshoooo
 
Especially in the high frequencies, the primary sound you will hear from a pneumatics cylinder is the exhaust, as sound from air flow within the system will be attenuated twice, once as it goes from air to plastic or metal, and again as it goes back to air.

I suspect that the major part of the sound in most cases is during the initial decompression of the compressed air, before the piston has moved very far. For a given exhaust port size, a larger volume piston will create a longer sound with a more gradual reduction in pitch, a smaller piston a shorter, sharper sound. Sound duration is determined by volume.

Just as with a brass or woodwind instrument, The pitch of the radiated sound will depend primarily on the length of the run from the exhaust port to the end of the tubing; a shorter tube will produce a fundamental frequency with a higher pitch.

As you look at robots that make the sound you desire, focus on the exhaust end first, from the exhaust orifice outward to get the pitch, then on the cylinder size to get the duration/decay rate.

Conor Ryan 27-04-2015 16:46

Re: Achieving The Pneumatics Bshoooo
 
Are we really getting to the point where the sound of the robot is an indication of build quality?

Coming in 2016 on a Scouting Form Near You
Quote:

Pneumatics Sound (circle one):
  • bshooo
  • ksshhhchung
  • PSSHUNK
  • PEWWWCHUK (spring loaded cylinder)
  • BRRRRRRRRRRRRRRRRRRRRRR (compressor running the entire match)


GeeTwo 30-04-2015 20:11

Re: Achieving The Pneumatics Bshoooo
 
Quote:

Originally Posted by Conor Ryan (Post 1477266)
Are we really getting to the point where the sound of the robot is an indication of build quality?

Coming in 2016 on a Scouting Form Near You[/list]

Designing for sound makes exactly as much sense as designing a pretty robot. We can count on 1114 to not design for sound just as much as they don't design for pretty, and for the same reasons. Think about all of the distinctive, even identifying, machine noises you've heard:
  • A Harley's pa-thut pa-thut in idle.
  • A classic VW Beetle's trilled purr (copied by George Jetson's space car about an octave up)
  • The throaty roar of a classic Mustang
  • The solid thunk of a steel car door
  • The heartbeat of a grandfather clock
  • Practically every machine in the Star Wars universe

NWChen 30-04-2015 21:00

Re: Achieving The Pneumatics Bshoooo
 
We've been able to replicate the bshoooo with a 3/4" bore, 2" stroke piston at 60psi. The corresponding solenoid was attached to a VexPro 3-station manifold.

DanielPlotas 30-04-2015 22:23

Re: Achieving The Pneumatics Bshoooo
 
Quote:

Originally Posted by NWChen (Post 1479085)
We've been able to replicate the bshoooo with a 3/4" bore, 2" stroke piston at 60psi. The corresponding solenoid was attached to a VexPro 3-station manifold.

Can you post a video?

NWChen 01-05-2015 23:49

Re: Achieving The Pneumatics Bshoooo
 
Quote:

Originally Posted by DanielPlotas (Post 1479117)
Can you post a video?

Sure, I'll try once our crate gets back.

Michael Hill 02-05-2015 08:02

Re: Achieving The Pneumatics Bshoooo
 
I remember 1986 having loud pneumatics in 2014. It was borderline ridiculous but had a rather satisfying sound

pilleya 02-05-2015 08:21

Re: Achieving The Pneumatics Bshoooo
 
This year our robot( team 4613) generated some very nice pneumatic sounds.

http://youtu.be/58SO-kO7Jr8

mrmummert 03-05-2015 11:10

Re: Achieving The Pneumatics Bshoooo
 
Ours chirps....(more so at the beginning and end of match)http://www.thebluealliance.com/match/2015tes_qm1


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