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Unread 12-24-2002, 07:56 PM
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kmcclary kmcclary is offline
Founder:7 teams;Mentor:66/470/more
FRC #0470 (Grizzly Robotics)
Team Role: Engineer
 
Join Date: Aug 2001
Rookie Year: 1994
Location: Ann Arbor, MI
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Sorry... Not on AHL. How about expanding the air supply???

Quote:
Originally posted by sanddrag
I have a couple of ideas. I was wondering if the following would be legal.

1) An onboard tank with some kind of cold liquid circulating through tubing wrapped around the motors. And/or a fan blowing across the tubes making a cold wind on the breakers.

2)An onboard can of cold spray actuated by a servo.
Sorry, BOTH are illegal due to using materials not on the Additional Hardware List (AHL). Remember, All materials on the robot must be either from the kit or the Additional Hardware List (AHL). Cold spray is not on the AHL, and you have no AHL legal refrigerant to circulate. You can use cold spray as a TOOL, but not as a PART on the robot. BTW, I already joked about that before. See above.

Hey, how about clamping a thermal mass (made out of AHL stuff) onto each breaker and chilling THEM before each round?

--- Air supply expansion as a coolant? ---

Depending on the pneumatics manual rules, you MIGHT be able to create an expansion valve for 120psi air and a heat fin assy to create a pretty lousy cooler out of the compressed air supply... Gad, that "feels" AWFULLY expensive in terms of compressor power usage for a TINY bit of cooling.

Are there any Air Conditioning experts out there that can run the numbers for that one and comment on it? How much cooling can you get by expanding the 120 PSI air supply to atmosphere for two minutes?? Assume you have NO other cylinder loads, have precharged ALL the tanks in this setup before the round, and clamped the heatsink onto ONE breaker:

(compressor)--> (ALL tanks)--> (control valve)--> (expansion_valve & heatsink assy)--> open air

At round start you open the control valve, and run the compressor full tilt. How much cooling could we get, in terms of degrees dropped on that one breaker over the two minutes?


That aside, I'm more interested in seeing DESIGN METHODS to prevent breaker trips listed here, versus simply finding ways to FOOL the breakers with chilling. Anyone have any OTHER ways to prevent breaker trips other than chilling, and the design methods already listed?

- Keith
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Keith McClary - Organizer/Mentor/Sponsor, Ann Arbor MI area FIRST teams
ACTI - Automation Computer Technologies, Inc; Sponsoring FIRST teams since 2001!
MI Robot Club / GO-Tech Maker's Club / RepRap-Michigan / SEMICNC Club
"Certifiably Insane": Started SEVEN FRC teams & many robot clubs (so far)!
2002: 830 Rat Pack | 2003-5;14: 1015;1076 Pi Hi Samurai | 2005-6: 1549 Washtenuts/FireTraxx
2005-..: 1502 Technical Difficulties | 2006-..: FIRST Volunteer!
2009-..: 470 AlphaOmega/Grizzlies | WAFL | Sponsor & Floating Engineer for MI Dist 13 (Washtenaw Cnty)
2011: 3638 Tigertrons | 2013-..: 4395 ViBots | 2014-.. 66 Grizzlies | 2016: 6190 Will Er Run | 2017-.. 6101 Strange Quarks
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