Diy crankshaft balancer

[racear]

I finally got around to building the automotive crankshaft balancer that I discussed in thread71-55369. Am using two piezos to get my readings. will be doing in Visual Basic. Am getting noise and can't filter out. Have heard of Fourier but do not know how to use the calculations or if there is another way to filter out the noise. Can see it on the data. Any help or suggestions would be unbelievably appreciated. Been out of school to long.
thanks
racear

 

[GregLocock]

There's lots of ways to filter out the noise, but Fourier is unfortunately the best, ad the basis for most of the others.

However, you may find that a moving average technique is good enough.

Say you have one revolution in 0.1 seconds, then just average (say) 0.02 seconds worth of data together, for each datapoint. If you apply exactly the same to both channels, and your once per rev marker, then you will get usable results.

Alternatively post some results up and get some more suggestions.



Cheers

Greg Locock

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.