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01-21-2014, 09:45 AM | #21 | |
I joined the Band! Join Date: Jun 2008 Location: Sacramento
Posts: 1,303
| Re: Does a bend in a link effect the geometry of the suspension?
he just said the same thing. Quote:
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01-21-2014, 09:46 AM | #22 |
Suck it up! Join Date: Mar 2008 Location: Arkansas
Posts: 11,652
| Re: Does a bend in a link effect the geometry of the suspension?
Somebody build this: This setup will give us repeatability and measure whether there are any lifting/squatting forces applied with a bent lint vs a straight one. |
01-21-2014, 09:50 AM | #23 |
Pebble Pounder Join Date: Nov 2013 Location: Here
Posts: 150
| Re: Does a bend in a link effect the geometry of the suspension? |
01-21-2014, 09:54 AM | #24 |
Im Brandon Join Date: Feb 2005 Location: Colfax, CA
Posts: 8,156
| Re: Does a bend in a link effect the geometry of the suspension? |
01-21-2014, 09:56 AM | #25 |
I joined the Band! Join Date: Jun 2008 Location: Sacramento
Posts: 1,303
| Re: Does a bend in a link effect the geometry of the suspension?
great fixture eyeball engineering to the rescue ? need to add a way to measure the compression or decompression length of the bent link Last edited by tom@vp; 01-21-2014 at 09:59 AM. |
01-21-2014, 10:06 AM | #26 |
Rock Stacker Join Date: Jan 2008 Location: Victoria BC
Posts: 94
| Re: Does a bend in a link effect the geometry of the suspension?
In the 1:1 world, the only thing we care about is the end points. Geometry is not effected at all by the shape of the link. Rcs are a whole differant ball game.The things that you can get away with on small scale would never fly in full scale, and things flex. I can run the RC and watch shocks flex and twist, plastic rod ends flex when maxed, everything moves a whole lot easier. I dont think that the video is a fair comparison though to be completly honest. Run it up a rock, actually drive it up, off camber, wouldnt be too bad to run the exact same line before and after and do the same type of video. I'd bet that it makes zero differance provided that the bends are causing the rod ends to contact anywhere. |
01-21-2014, 10:07 AM | #27 |
Scale Detail Engineering Join Date: Apr 2010 Location: Turtle Island
Posts: 5,573
| Re: Does a bend in a link effect the geometry of the suspension?
an arc is an arc. I could do a quick test in Maya with different bent links using the same pivot points but it doesn't make any sense to me... so I'm not going to. |
01-21-2014, 10:15 AM | #28 |
I wanna be Dave Join Date: Dec 2009 Location: .
Posts: 7,967
| Re: Does a bend in a link effect the geometry of the suspension?
Ti in first vid, all thread in second? If so thats apples and oranges and I'd bet the all thread flexes more. |
01-21-2014, 10:29 AM | #29 | |
Suck it up! Join Date: Mar 2008 Location: Arkansas
Posts: 11,652
| Re: Does a bend in a link effect the geometry of the suspension? Quote:
Compression/decompression would be easy, though it might require molestation of a digital caliper....ie...drill a hole in each arm and bolt it on with the link. If the link flexes it'll pick it up. | |
01-21-2014, 10:30 AM | #30 |
Suck it up! Join Date: Mar 2008 Location: Arkansas
Posts: 11,652
| Re: Does a bend in a link effect the geometry of the suspension? |
01-21-2014, 10:45 AM | #31 |
20K Club Join Date: Jul 2004 Location: Sending illegals home one Hayabusa at a time.
Posts: 22,981
| Re: Does a bend in a link effect the geometry of the suspension?
Endpoint to endpoint. #physics Only variable is material properties. |
01-21-2014, 10:48 AM | #32 |
I wanna be Dave Join Date: May 2007 Location: Fairfield ME
Posts: 3,886
| Re: Does a bend in a link effect the geometry of the suspension? |
01-21-2014, 11:18 AM | #33 |
Pebble Pounder Join Date: Nov 2013 Location: Here
Posts: 150
| Re: Does a bend in a link effect the geometry of the suspension?
I made a quick model of a link. 4" (101.6mm) from eyelet to eyelet. I picked an arbitrary number of 10lbs in the X axis for the load which was applied to one eyelet. I measured the reaction forces at the other eyelet. This first analysis is with 15 degree bend. It's hard to see when resized @ 800pixels so click the link for the full size. Reaction @ the eyelet in the X direction is 10lbs. Reaction in the Y direction for all intents and purposes is zero. FEA solvers have a problem calculating Zero so you will have to trust that 0.0000000002 is as close to zero as you will get from this particular solver. https://lh6.googleusercontent.com/-7..._15_Degree.jpg Here is a link with a 30 degree bend. Same eye to eye dimension of 101.6mm and same 10lbs load. Reaction forces are the same, zero off axis and 10lbs in the X axis. Displacement has jumped 239% under the same load. Stresses has increased 203%. https://lh3.googleusercontent.com/-e..._30_Degree.jpg Finally I did a sensitivity study and varied the angle of the bend in the link from 1 to 40 to see how the stresses and displacement behave when the angle of the link is varied. The stresses in the link behave in a linear fashion while the displacement behave non-linearly. https://lh5.googleusercontent.com/-P...ensitivity.jpg |
01-21-2014, 11:24 AM | #34 |
RCC Addict Join Date: Apr 2009 Location: Token's life matters
Posts: 1,836
| Re: Does a bend in a link effect the geometry of the suspension? |
01-21-2014, 11:46 AM | #35 | |||||
Wanna get? Gotta want. Join Date: Apr 2010 Location: SLC, UT
Posts: 7,052
| Re: Does a bend in a link effect the geometry of the suspension? Quote:
Quote:
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Are bent links covered in that book? I have not read it. If it is, do you have a page reference? Last edited by Erik D_lux; 01-21-2014 at 11:53 AM. | |||||
01-21-2014, 11:50 AM | #36 |
Wanna get? Gotta want. Join Date: Apr 2010 Location: SLC, UT
Posts: 7,052
| Re: Does a bend in a link effect the geometry of the suspension?
The reason I am holding the rear axle is because its the only idea I have of simulating the axle rotation. I do know that it shows accurate affects on my chassis when I move them up/down at the chassis so that is why I took the assumption when I did it this way too. If anybody has a better simulation, other than driving, which I plan to do, I am all ears.
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01-21-2014, 11:52 AM | #37 |
2013 2.2P Nat. Champion Join Date: Sep 2009 Location: BorderLine Crawlers Season 3 is on!
Posts: 2,584
| Re: Does a bend in a link effect the geometry of the suspension?
From the other thread. Imagine one of those crazy straws, the liquid still goes from your cup to your mouth. Same as a straight straw. Two points lie on a line, independent of how you get there. J |
01-21-2014, 11:56 AM | #38 |
Suck it up! Join Date: Mar 2008 Location: Arkansas
Posts: 11,652
| Re: Does a bend in a link effect the geometry of the suspension? Just for giggles, can you do it again with the bends near one end of the link?
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01-21-2014, 12:04 PM | #39 |
Wanna get? Gotta want. Join Date: Apr 2010 Location: SLC, UT
Posts: 7,052
| Re: Does a bend in a link effect the geometry of the suspension?
Just more food for thought... My bends are pretty impractical in the video, but what about a bent rod end? I would guess it should have the same impact on a smaller scale? |
01-21-2014, 12:16 PM | #40 |
I wanna be Dave Join Date: Dec 2009 Location: .
Posts: 7,967
| Re: Does a bend in a link effect the geometry of the suspension? I'm guessing it works the same way as those uppers are physically in the center of the axle, but not bolted directly to it.
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