Dear Robert,


At 22.11 2012.06.21, you wrote:
>Can you sample your accelerometer data with your 20G sensor and then look
>at it with
>a sound editor so you can scroll through the data set easily (Audigy is
>free OSS).
>You could then also do a FFT on the signal at a constant motor RPM and see
>if the
>cylinder firing rate is the dominant noise source or something else.
>You really need to look at your signal to see why it isn't filtering as yo=
u
>expect.
>
>3M makes a noise damping tape that you might be able to fit on one side of
>your mounting plate. It is 0.15 mm thick but works amazingly well to damp
>HF ringing of metal.  A 2 x 6" steel plate going from 'ping' with long rin=
g
>tone, to 'thunk' with just a 1" square of tape applied.

Found it, thanks:
http://multimedia.3m.com/mws/mediawebserver?mwsId=3DSSSSSu7zK1fslxtU4x_1mx_=
Gev7qe17zHvTSevTSeSSSSSS--&fn=3D436.pdf


>I think you actually want the LEAST stiff mounting plate so that you damp
>out the high frequency components coupled in from the mounting holes.

All right.


>I think you will find that if you want good frequency response to tilt,
>you'll need to go with a composite (accel + gyro) solution.

Would ~ 3Hz still make a gyro necessary in Your opinion?

Thanks a lot.

Mario

>
>R
>--=20
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