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Calculation of vehicle pitch rate and roll rate from acceleration 
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#1
Jan1210, 04:57 PM

P: 173

I have to estimate the pitch rate and the roll rate of a vehicle, from measured accelerations. I have many three axial accelerometers. How can i accomplish it?



#2
Jan1310, 09:19 AM

P: 250




#3
Jan1310, 10:59 AM

P: 173




#4
Jan1310, 11:42 AM

HW Helper
P: 7,134

Calculation of vehicle pitch rate and roll rate from acceleration
If these are "axial" accelerometers, than placement doesn't matter, as long as you get the "axis" of the accelertometers aligned with the desired axis, pitch, roll, yaw. You wouldn't need to calculate anything, just convert the outputs of the "axial" accelerometers into a rate such as radians / second. Radio control helicopter generally use silicon based "gyros" which include axial accelerometers in the form of a vibrating component that varies electrical output based on rate of rotation.



#5
Jan1310, 03:23 PM

P: 4,663

For an accelerating automobile, the torque in the propeller shaft (into the differential) creates an axial pitch (torque). For a propeller plane, the prop torque (power/radians per sec) may create a pitch also.
Bob S 


#6
Jan1410, 05:08 PM

P: 173




#7
Jan1410, 09:59 PM

P: 4,663

http://en.wikipedia.org/wiki/Euler_angles will align the accelerometer readout with the vehicle axes. Bob S 


#8
Jan1410, 11:49 PM

HW Helper
P: 7,134

If you can setup or buy a 3 orthogonal axis cluster, then you could mount the cluster, then accelerate and brake, adjusting the cluster until you just get a readout for pitch. Yaw and roll would be more difficult to separate, perhaps pushing on the car from the side. You could use a level to make sure the cluster was vertically and horizontally aligned, but the yaw axis would still be an issue. 


#9
Jan1710, 05:42 PM

P: 173




#10
Mar711, 04:42 AM

P: 3

I need some information from you guys.
I have readings from acceleration sensors i.e. Acceleration along Xaxis, Yaxis and Zaxis. I want to find the Pitch and roll angle from the above data. Is it possible to find the Pitch and roll data from accleration data. Regards waiting for your kind and early reply 


#11
Mar811, 09:41 AM

P: 173

http://elib.tudarmstadt.de/tocs/209699132.pdf You can read it from google books. 


#12
Mar1111, 10:31 AM

P: 1

Dear
Actually this book is not frequently available. Can you upload those equation which help for combine angular and translational accelerations? 


#13
Mar1311, 11:45 AM

P: 173

http://books.google.com/books?id=tv8...page&q&f=false however are normal equation of classical mechanics... 


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