I would like to know if so, how raw 3-axis accelerometer data could be analyzed and manipulated real-time to register periods of vibration. The device being used has a max sample rate of 62Hz (I understand this is quite low), and aims to recognize when it is in a state of vibration as opposed to freely moving when mounted on a users person.
I have gathered some test data and have plotted resultant acceleration magnitude, although it is looking difficult to recognize contrast between vibration and free movement. I have also looked into plotting the change in angle between each two contiguous readings, thinking along the lines that the angle should be greater than 90 degrees (in the case that the vibration isn't resonating with my hardware's frequency) due to uniform oscillation - would I be along the right lines with this?
Just to clarify, I do not need to measure the vibrations, just acknowledge them.