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Unread 10-02-2011, 14:37
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Re: How to Mount a Gyro

Quote:
Originally Posted by omalleyj View Post
Think about an extreme example where the gyro very far from the axis of rotation. Its a yaw rate sensor where the amount of rotation is determined by integrating the angular acceleration. You can indirectly compensate for the increased acceleration by changing your mv/deg/s constant, but you will reduce the maximum deg/sec you can measure before you out pace its ability to keep up.
The datasheet for the ADXRS150 says the null has a linear acceleration effect of 0.2 degrees per second per g.

So if the gyro were mounted, say, 38/2 = 19 inches away from the center of rotation of the robot, and the robot were rotating at 180 degrees per second, you could calculate the effect:

180 degrees/sec = 3.14 radians/sec

(3.14^2)*(19) = 187.5 inches/sec^2 = 15.6 ft/sec^2 = 0.488 g's radial acceleration

So (0.2 degrees/sec/g)*(0.488 g) ~= 0.1 deg/sec





Last edited by Ether : 10-02-2011 at 14:49.
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