Re: [foxboro] RE : LLAG Block
- From: "Clement, Mark (Kiddmetallurgical - Copper)" <MClement@xxxxxxxxxxxxxxxxxxxxxxxx>
- To: "'foxboro@xxxxxxxxxxxxx'" <foxboro@xxxxxxxxxxxxx>
- Date: Wed, 4 Jul 2007 13:29:20 -0400
Thanks Terry=20
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx
[mailto:foxboro-bounce@xxxxxxxxxxxxx]On Behalf Of Doucet, Terrence
Sent: Wednesday, July 04, 2007 12:54 PM
To: foxboro@xxxxxxxxxxxxx
Subject: [foxboro] RE : LLAG Block
Mark,
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Just so we don't leave you hanging I will make a few statements which
hopefuly you do not already know.
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1. I really don't know the specific Foxboro answer. The EDOC shows the
complex equation used when this form is enabled and it would probably =
take
me two days to resolve for " y " unless I could find a recent graduate =
who
remembers how to do all that stuff.
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2. The standard lead-lag block uses LAGTIM that specifies the time =
constant
for a "first order" lag.
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3. A quadratic equation is one that uses a higher power (you know, like
George Bush) perhaps squared or fourth power or something else. The =
LAG2
operation seems to cause the output to take a different form than first
order lag and that varrying the parameters can change the shape of the
response.
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4. My last recollection of using such equations was for open flow
measurement such as on river flood water.
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Hope this helps.
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Terry
________________________________
De: foxboro-bounce@xxxxxxxxxxxxx de la part de Clement, Mark
(Kiddmetallurgical - Copper)
Date: mer. 2007-07-04 07:15
=C0: 'foxboro@xxxxxxxxxxxxx'
Objet : Re: [foxboro] LLAG Block
Trying this again
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx
[mailto:foxboro-bounce@xxxxxxxxxxxxx]On Behalf Of Clement, Mark
(Kiddmetallurgical - Copper)
Sent: Friday, June 29, 2007 1:35 PM
To: 'foxboro@xxxxxxxxxxxxx'
Subject: [foxboro] LLAG Block
Hi All,
Has anyone ever run across documentation on how the LAG2 parameter =
works
with the LLAG block ?
Specifically interested in knowing what "quadratic lag time " is and =
how it
could be used
Thanks in advance
Regards
Mark
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your own risks. Read http://www.thecassandraproject.org/disclaimer.html
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