Go to Post Admiring the new chassis: "Oooo, nerd bling!" - Rick TYler [more]
Home
Go Back   Chief Delphi > Technical > Pneumatics
CD-Media   CD-Spy  
portal register members calendar search Today's Posts Mark Forums Read FAQ rules

 
 
 
Thread Tools Rate Thread Display Modes
Prev Previous Post   Next Post Next
  #7   Spotlight this post!  
Unread 16-12-2003, 15:37
Matt Adams's Avatar
Matt Adams Matt Adams is offline
b(o_o)d
FRC #1525 (Warbots)
Team Role: Engineer
 
Join Date: Dec 2003
Rookie Year: 2000
Location: Arlington Hts. IL
Posts: 375
Matt Adams has a reputation beyond reputeMatt Adams has a reputation beyond reputeMatt Adams has a reputation beyond reputeMatt Adams has a reputation beyond reputeMatt Adams has a reputation beyond reputeMatt Adams has a reputation beyond reputeMatt Adams has a reputation beyond reputeMatt Adams has a reputation beyond reputeMatt Adams has a reputation beyond reputeMatt Adams has a reputation beyond reputeMatt Adams has a reputation beyond repute
Send a message via AIM to Matt Adams
Re: PSI formula for pneumatic pistons

Quote:
Originally Posted by Ryan
Thanks, I need to clarify my question. If the PSI isn't on the piston, what formula do you use to figure it out? It's for a project in my robotics class.
If you would like to treat it as a "thin-walled pressure vessel" I could get you the formula for that... it is:

Max Tangential (hoop) Stress = p * (di + t) / (2t)

p = pressure inside the vessel
di = inner diameter
t = wall thickness

Max stress for steel varies widely.. from maybe 30,000 to 150,000 psi. Assuming you know this, you can re-arrange the above equation to solve for the max pressure inside. (then divide this by maybe 1.5 or 2 for a factor of safety, probably more since failure would be catastrophic!)

A longitudinal stress also exists because of the pressure on the end of the vessel.

this stress is equal to: (p*di) /(4*t)

If you want to think of these as pressurized cylinders that are NOT thin-walled, ie. the thickness of the wall is greater than 1/20th the radius, the formulas become more complicated.

Let me know what you need, I can come up with them pretty quick.

Matt
__________________
Matt Adams - Engineer at Danaher Motion
Team 1525 - Warbots - Deerfield High School
 


Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Inverse Tangent D.Viddy Programming 10 25-01-2003 22:24
Auto Air Pump Code zorro Programming 25 05-01-2003 16:50


All times are GMT -5. The time now is 11:03.

The Chief Delphi Forums are sponsored by Innovation First International, Inc.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Copyright © Chief Delphi