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I can get the three x, y, and z values from the accelerometer in Android. How can I use these to calculate the g-force?
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To convert revolutions per minute (RPM) to relative centrifugal force (RCF), or g force, use the following formula: RCF = (RPM)2 × 1.118 × 10-5 × r. Relative centrifugal force is dependent on the speed of rotation in RPM and the distance of the particles from the center of rotation.
The total acceleration is best described by a vector consisting of the x, y, and z components that you have from the accelerometer. The magnitude of the acceleration is the square root of the sum of the squares of each component, i.e. sqrt( x^2+y^2+z^2).
If the accelerometer measures acceleration in meters per second squared (the SI unit), you can convert each acceleration into a g-force measurement by dividing by 9.81 .
The accelerometer in the mobile device provides the XYZ coordinate values, which is used to measure the position and the acceleration of the device. The XYZ coordinate represents direction and position of the device at which acceleration occurred.
If the accelerometer measures acceleration in meters per second squared (the SI unit), you can convert each acceleration into a g-force measurement by dividing by 9.81.
If you want the g-force as an directionless measurement, you just need to apply the pythagorean theorem to the different components of the acceleration:
double g = Math.sqrt(x * x + y * y + z * z);
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