At 11.31 2012.06.22, 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
>> >you 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 ring tone, to 'thunk' with just a 1" square of tape applied.
>
>Are you sure that the electronics box isn't moving far enough on its=20
>flexible mounting that it hits the frame on big bumps?

It's moving (vibrating) but not enough to collide with the frame.

Anyhow the bumps aren't causing this (they would worsen the problem though)=
,
as I'm in this situation even just revving with the gearbox in neutral..

Now I have to buy and try with the vibration damper tape (between the ECU a=
nd
the mounting plate, which then is attached to the bike's frame through 2 ru=
bber
washers), higher g's accel, different RC constant, DSP.. I will be busy a b=
it. :D

Cheers,
Mario

--=20
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