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03-28-2014, 01:18 AM | #1 |
Newbie Join Date: Oct 2013 Location: Corvallis
Posts: 11
| Fully Active Pneumatic Suspension Build Completed
Hey guys, I've finally completed a senior project I've been working on . Check it out and let me know what you think. https://sites.google.com/site/pvfjr1/aleas It's a modified SCX10 Honcho that has small pneumatic cylinders for shocks. It has a control system that I designed with an accelerometer, gyroscope, force sensors, and cylinder position encoders. Servos operate small air valves, and two lightweight tanks store compressed air from a bike pump. Using open differentials, I have more than doubled RTI test performance, added 7* of rollover resistance, and improved dynamic ditch escaping abilities. Check out a couple of the videos below, or just visit the site for more information. https://www.youtube.com/watch?v=V_fctmLv1VM https://www.youtube.com/watch?v=_9AArzLKP0E Last edited by pvfjr; 03-28-2014 at 01:31 AM. |
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03-28-2014, 01:38 AM | #2 |
Newbie Join Date: Feb 2014 Location: Indiana
Posts: 10
| Re: Fully Active Pneumatic Suspension Build Completed
That is a very cool project! I will have to remember to watch the videos when I get home from work.
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03-28-2014, 01:43 AM | #3 |
RCC Addict Join Date: Aug 2011 Location: Elkhart
Posts: 922
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Wow. Very cool. That's amazing work. Give yourself a pat on the back. I wish I had the knowledge and time to do that! Very cool. |
03-28-2014, 01:55 AM | #4 |
Newbie Join Date: Oct 2013 Location: Corvallis
Posts: 11
| Re: Fully Active Pneumatic Suspension Build Completed Thanks. This is the project where I get to show off five years of learning electrical, computer, and mechanical engineering. I'm pretty pleased with how things turned out--particularly the dynamic ditch escape. It was an interesting problem that's never really been done before, and I had no idea if it would even work.
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03-28-2014, 05:08 PM | #5 |
Quarry Creeper Join Date: Dec 2013 Location: San Diego county
Posts: 261
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That is seriously one of the coolest self built systems I haver ever seen in rc, awesome.
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03-28-2014, 05:28 PM | #6 |
Quarry Creeper Join Date: Mar 2009 Location: Central WA
Posts: 354
| Re: Fully Active Pneumatic Suspension Build Completed
Thats a pretty nifty setup. Very creative. Question, what is the weight of the stock rig as tested and what is the weight of the modified rig?
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03-28-2014, 07:03 PM | #7 |
RCC Addict Join Date: Oct 2006 Location: crawlifornia
Posts: 1,612
| Re: Fully Active Pneumatic Suspension Build Completed
Love it. Nice work. |
03-28-2014, 07:19 PM | #8 |
Adilynsdad too! Join Date: May 2004 Location: G ville
Posts: 8,844
| Re: Fully Active Pneumatic Suspension Build Completed
That is too cool, very inventive
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03-28-2014, 08:40 PM | #9 | |
RCC Addict Join Date: Oct 2006 Location: crawlifornia
Posts: 1,612
| Re: Fully Active Pneumatic Suspension Build Completed Quote:
I think it has actually been tried before on rcc, but never finished iirc. In 1x1 there was a load leveling system for crawlers based on air bags and a central brain. It never got popular for some reason. I'm also curious of the weight difference between these two test vehicles. Last edited by rockhugger; 03-29-2014 at 12:13 AM. | |
03-29-2014, 12:02 AM | #10 |
Rock Crawler Join Date: Jan 2013 Location: San Diego
Posts: 605
| Re: Fully Active Pneumatic Suspension Build Completed
That is really cool! Your website says that is a proof of concept, so I hope you can continue working on it and get it into bigger and better things! ie. 1:1 rigs!
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03-30-2014, 09:46 AM | #11 |
Newbie Join Date: Oct 2013 Location: Corvallis
Posts: 11
| Re: Fully Active Pneumatic Suspension Build Completed |
03-30-2014, 09:51 AM | #12 | |
Newbie Join Date: Oct 2013 Location: Corvallis
Posts: 11
| Re: Fully Active Pneumatic Suspension Build Completed Quote:
Do you think you could find a link to the 1:1 system you're talking about? | |
03-30-2014, 09:52 AM | #13 |
Newbie Join Date: Oct 2013 Location: Corvallis
Posts: 11
| Re: Fully Active Pneumatic Suspension Build Completed Yeah, I have a Nissan Pathfinder, some 16" cylinders, and a set of Mercedes Unimog axles that I'd like to try this with.
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03-30-2014, 10:03 AM | #14 | |
I wanna be Dave Join Date: Aug 2004 Location: Tri-cities, WA
Posts: 4,831
| Re: Fully Active Pneumatic Suspension Build Completed Quote:
Pretty sure he's talking about the air rock suspension system. I talked to the owner of a winch rope company one year at a big rock crawling event that had the system. The next year he brought his Jeep back with coilovers instead of air bags. I asked him why the change and he said it was great until you went around a long S turn on the highway and the suspension compensated for the side load. When you hit the next corner quickly the weight was already shifted outwardly not in or centered so it was spooky to drive. | |
03-30-2014, 10:06 AM | #15 |
Rock Crawler Join Date: Jul 2012 Location: Long Island, NY
Posts: 563
| Re: Fully Active Pneumatic Suspension Build Completed
Eventually will you be able to do all the setup at the transmitter instead of having to touch the truck to adjust for the ditch escape for example?
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03-31-2014, 12:08 AM | #16 | |
Newbie Join Date: Oct 2013 Location: Corvallis
Posts: 11
| Re: Fully Active Pneumatic Suspension Build Completed Quote:
Too bad they abandoned the system for a fixable problem. | |
03-31-2014, 12:10 AM | #17 |
Newbie Join Date: Oct 2013 Location: Corvallis
Posts: 11
| Re: Fully Active Pneumatic Suspension Build Completed There is a lot of programming that I could have done, but I was gathering a lot of data from the thing as it operated and didn't want to worry about packet loss, so I went with a dedicated UART/USB connection rather than a wireless connection. It would take very little work to hook it up with an Xbee or something though.
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03-31-2014, 12:38 AM | #18 | ||
RCC Addict Join Date: Oct 2006 Location: crawlifornia
Posts: 1,612
| Re: Fully Active Pneumatic Suspension Build Completed Quote:
Quote:
I'm also sure Accelerometers have shrunk in size, and / or are more readily available for such uses now. good stuff on the degrees. | ||
03-31-2014, 08:10 AM | #19 |
RCC Addict Join Date: Feb 2012 Location: UK
Posts: 1,015
| Re: Fully Active Pneumatic Suspension Build Completed
Land Rovers have a similar system. My Discovery 2 had it.
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03-31-2014, 09:38 AM | #20 | |
I wanna be Dave Join Date: Aug 2004 Location: Tri-cities, WA
Posts: 4,831
| Re: Fully Active Pneumatic Suspension Build Completed Quote:
Some people build nice stuff and get around just fine. While others are in engineering programs and think they can build the best mouse trap. Look up chainlink and chainlinks retarded cousin for perfect examples of a super complicated answer to the non problem. I'm not playing down the knowledge or skills needed to build an rc with active suspension so don't get me wrong. I'm just saying enjoy it for what it is, your kick ass project. | |
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