Neat and sweet.
Regards,
Alex Johnson
The Foxboro Company
10707 Haddington
Houston, TX 77043
713.722.2859 (v)
713.722.2700 (sb)
713.932.0222 (f)
[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
-----Original Message-----
From: Schouten, Frits JF [SMTP:[EMAIL PROTECTED]]
Sent: Sunday, September 10, 2000 3:53 PM
To: 'Foxboro DCS Mail List'
Subject: RE: Rolling average
Talking about rolling average, I use a AIN block with filter option.
That just works a gem.
Anyone ever thought about 0-360deg wind vane damping?
See the problem around North? 1,360,1,360..... would average 180
wouldn't it?
Here is what I did.
In a CALC block split out the SIN and COS and output it to say
RO02/03
Those two outputs each go to an AIN block with filter option ON and
filtertime say 1.
The output of those AIN blocks is then fed back in the CALC block to
be ASINed and ACOSed and with a bit of smarts put back together to form
0-360deg.
There you have it. A very well stabilised wind vane signal which can
now be used to drive an directional indicator (FoxView) without driving the
operator mad.
Cheers,
Frits Schouten.
BHP-NZSteel.
EOM
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