Strain Gauge Data Acquisition |
Post Reply |
Author | |
CobraCommander
Milling Master Joined: Feb/03/2010 Location: Ontario, Canada Status: Offline Points: 95 |
Post Options
Thanks(0)
Posted: Apr/23/2010 at 4:04pm |
Anybody already do it? I know some FSAE teams have used it.
I'm trying to get something together for mobile testing on the frame but am not terribly skilled with electronics. My basic plan is to make your run of the mill data logger with a 3-axis accelerometer for estimating the current loading of the frame. Then using a series of strain gauges to test the frame hopefully get some data that can then be used for future optimization. The largest hurdle I've encountered is how to get a useful signal from the strain gauge without the bulky equipment that the college uses. I've found some useful links via google but have yet to try them out. Mostly I'm worried I'll amplify the signal noise as much as the signal itself... Anyone got any thoughts on the subject? |
|
COBRA Team Captain
|
|
Waffles
Welding Master Joined: Jun/02/2009 Status: Offline Points: 110 |
Post Options
Thanks(0)
|
I would instrument the car with accels, load cells on the shocks, and strain gages on the frame in a controlled environment like a lab. Do simple dynamic tests or static load tests to validate your FEM strains to strain gages. Then go out on the track minus the strain gages and apply those conditions to your model to determine strains/stresses.
It's not that you can't use strain gages running outdoors on a track, but its going to be very hard to get good data. Strain gages are notorious for drifting and being noisy to the point of uselessness, whereas accels and loadcells are proven. |
|
CLReedy21
Baja Godfather Joined: Nov/30/2008 Location: Marysville, OH Status: Offline Points: 736 |
Post Options
Thanks(0)
|
Waffles has the right idea.
We did what he suggested with an older car to prove the FE model. We applied strain gages to the frame and suspension members and did drop tests from a hoist in the lab. |
|
-Chris Reedy
TTU Alumni Fourwheeler Drawer "Quick with the hammer, slow with the brain." |
|
collinskl1
Baja Godfather Joined: Jan/21/2009 Location: Saginaw, MI Status: Offline Points: 1056 |
Post Options
Thanks(0)
|
^^^ That's exactly what we do. We have a wireless unit that we use for very short mobile tests as well, but not for running laps... mainly like a short run over a jump. It makes for good validation of our FEA.
|
|
Kyle Collins
Lipscomb University Alumni 2x Project Manager Nexteer Automotive Product Engineer, Electronic Power Steering ... and the 8th simple machine: a bigger hammer. |
|
p.lewis
Welding Master Joined: Oct/05/2009 Location: Greater Detroit Status: Offline Points: 296 |
Post Options
Thanks(0)
|
SAE paper 2006-01-3626: Structural Considerations of a Baja SAE Frame
That may be an interesting read for you.
|
|
mkim44
Double Secret Probation Joined: Jul/22/2014 Status: Offline Points: 2 |
Post Options
Thanks(0)
|
Hi, I was wondering what model of load cell you used on your shocks collinskl1 and CLReedy21.
Also, I was going to use strain gauges on the rear suspension arms to do some static load testing, but I am worried the displacement will be so small that even the best wheatstone bridge won't do it. Did you need amplification for the strain gauges? If so what did you use? Thanks |
|
cozierad
Bolt Sorter Joined: Oct/03/2012 Location: United States Status: Offline Points: 27 |
Post Options
Thanks(0)
|
We did this in testing a couple of years back after a nasty rear end frame break at Wisconsin in 2012.
https://www.youtube.com/watch?v=PtBiS_oW1tU#t=52 |
|
Miami University: RedHawk Racing
Oxford, Ohio Miami was a University when Florida belonged to Spain... |
|
Post Reply | |
Tweet
|
Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |