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Subject: Re: THERM, modeling of PID controller
Author: Dave Johnson
Date: 1998-12-16 00:48:00Hi Alex,
Sounds like a COMBIN37 problem. See Verification Manual problem
VM-159 for a simple example (its in the On-Line Help, Table of Contents,
Verification Manual). You'll also need to study the elements manual
description on COMBIN37 to get all the element options and real
constants working the way you want them.
For your problem, perhaps use a node with a dummy element on it and a
fixed temp (at the "desired temp" for your problem). That node will be
one of the control nodes for the COMBIN37. Then you can control the
heat input based on the difference of that "desired temp" node and some
other node on your solid.
Good luck,
Dave Johnson
Ng Siu Wai, Alex wrote:
> From: "Ng Siu Wai, Alex"
> Dear all,
> I am trying to model a transient thermal problem which consists of a heater
> and a solid. The output of the heater is governed by a PID controller, with
> the difference between the desired temperature and the temperature feedback
> from a certain position of the solid as input.
> Is there anyone has similar experience to model the PID controller in
> transient thermal analysis?
> Thanks in advance.
> Alex Ng
> ASM Assembly Automation Ltd