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Geez Data
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Geez Data
8/27/10 7:37 AM
Is there any chance of getting the software to sample the internal accelerometer 10 times a sec and the internal GPS one time per sec. and include this data in the standard excel log. With this combination of data, It would be possible to do an incredible amount of off line data analysis.

Andy Whittle
RE: Geez Data
8/27/10 10:16 AM as a reply to Andy Whittle.
The GPS and the accelerometer are two different data sources and I need to resort to using the one with the lowest rate. Up sampling the slower would be inaccurate. If you use a higher rate GPS like an external 5Hz or 10hz GPS, then you will be able to receive the higher rate of the accelerometer as well. Since you're analyzing at this level of detail, you'll probably want the external bluetooth GPS for better accuracy and resolution, too.

Jeff
RE: Geez Data
8/27/10 10:46 AM as a reply to Jeff Trackaroo.
So will it be possible if I get on of the 10 hz GPS devices?

Here is where I have pulled off so far. The lines to the inside of the turn indicate the instantaneous center of curvature.

http://www.ncs-stl.com/trackmaster/GatewayScreenShot03.JPG

Here is some geez data off one of the autocross cars I work on.

http://www.ncs-stl.com/dynolicious/Mike_GG_Front_6_13_2010.jpg

http://www.ncs-stl.com/dynolicious/Mike_StripChart_Front_6_13_2010.jpg

Andy
RE: Geez Data
8/27/10 11:01 AM as a reply to Andy Whittle.
Yes, a 10 Hz will work, too.

Jeff
RE: Geez Data
8/27/10 11:28 AM as a reply to Jeff Trackaroo.
Thanks Jeff

Just for fun I did the Bremmerton run that was posted as an example on your site.

RE: Geez Data
9/16/10 1:44 PM as a reply to Andy Whittle.
Interesting. I'm curious, what are you using this information for? Reverse engineering a track?
RE: Geez Data
9/16/10 2:55 PM as a reply to Ryan Utara.
I primarily autocross. We use this to compare drivers and see how smooth a driver is. Eventually I will be doing motorcycle coaching. They a quite difficult to get your head around from one lap to the next.

AW
RE: Geez Data
9/17/10 4:55 AM as a reply to Andy Whittle.
Ah, that makes much more sense. Thanks for the school lesson.
RE: Geez Data
9/17/10 5:32 AM as a reply to Ryan Utara.
Here is a better example from the 2010 national autocross championship

http://www.ncs-stl.com/trackmaster/Nationals2010Trackmap.jpg

on the left is corner radius and on the right is relative geez
RE: Geez Data
9/21/10 5:06 AM as a reply to Andy Whittle.
Gotcha. It was also key for me to understand that you meant acceleration by "geez". I googled it and realized that's a common software name for you autocrossers. emoticon had me confused. I'm an engineer so "geez" = OMG, and "G" = acceleration normalized to gravitational units. It seems the playback of an acceleration circle is more informative than simply knowing your cornering acceleration as you're missing half of the info in those charts (brake and gas).

I just figure I could stare at those charts you posted for hours and not really learn much from my "run" (although I don't really autocross anymore, myself). I should think a replay with an acceleration circle would be much more informative. Either that or acceleration data + steering angle data overlaid could really help you examine your driving habits. example: http://www.optimumg.com/OptimumGWebSite/Documents/TechTips/SteeringvLatacceltechtip.pdf
RE: Geez Data
9/21/10 8:45 AM as a reply to Ryan Utara.
We do that with a 3 axis accelerometer.

see http://www.ncs-stl.com/dynolicious/CRX_GG_Ctr_8_3_2009.jpg for a sample off my CRX

I think Geez may be an autocross terminology that originated from an older device that ran off a palm V that was known as a GeezCube. It still all comes down to V^2/R and ft/sec/sec

AW

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