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.

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

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

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

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