Measuring vibration

[smommer]

Hi all,

 

I have a quesiton about how we measure vibration. I am developing a keypad that provides haptic feedback, for this i am using vibrator motors not too dissimilar from the vibrator motors you find in mobile phones and pagers. such as

 

http://www.vibratormotor.com/4AL-01WA.html

 

and http://www.sanyo.com/industrial/micro_motors/vibrator/downloads/4L-M-01-080.pdf

 

I would need to include a metric for vibration in my study design when evaluating the suitability of such a device. In these specs it notes the motors RPM but this isnt actually a metric of vibration, e.g. amplitude and displacement. Is there a standard metric for measuring vibration? if so is there a way to calculate the vibration theoretically from the specs without the need to get the motors running under a high speed video camera and counting them? Perhaps im misunderstanding the specs but ive looked at a few and there doesnt appear to be a uniform representation of vibration.

[insane_alien]

amplitude and displacement are the same thing in these vibrators. just measure it in millimeters.

[Kedas]

if vibration measuring devices don't have what you are looking for then nothing will.

http://www.korins.co.kr/davis/m/l.pdf

[Equuleus]

http://www.ccohs.ca/oshanswers/phys_agents/vibration/vibration_measure.html