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Old 03-08-2016, 04:10 PM   #1
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Can anyone read a vibration app chart?

I do not know what I'm looking at. I was trying to analyze a chassis vibration and get an app for my iPhone. I don't know what the result is, but I was doing about 45mph and rested the phone on my dash to get a reading:

I think it says that at 3.1250 Hz/div, the big spike looks to be about 15.6 Hz?
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Old 03-08-2016, 04:34 PM   #2
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These apps can work two ways....using sound, and using the internal
accellerometers.

The frequency give you a hint of how big the thing is which is vibrating.
A lower frequency would be something like a tire or wheel, a higher frequency would be the bearing in a heater fan.

For a chassis vibration, watch the phone and try to make the vibration come and go. Watch which frequency seems to match when it appears.

then move the phone around the coach, to see when the amplitude is greatest (loudest). That means your getting closer.

Using your ear may work better.

regards,

Dan
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