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davorin
Joined: 07 Jun 2003
Posts: 1490
Helped: 8
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 04 Oct 2004 21:51 Heater simulation |
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Difficult to choose right forum here...but it has more to do with math and simulation than everything else..
I have a heaterblock and a K-type thermocouple sensor and want to acquire the step-response of the system when turned on 100% cycle...
1. Is this step-response enough for calculating the right parameters for controlling the temperature then?
2. Is there anything in Matlab I can use for this?
3. Never done anything like that before (o;
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flatulent
Joined: 19 Jul 2002
Posts: 4863
Helped: 292
Location: Middle Earth
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| 05 Oct 2004 1:02 Re: Heater simulation |
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Making feedback systems for this use is very difficult. There are several poles in the system. this is why house heating systems are "crash-bang" with full on and off at temperature limits.
I would suspect that you would have to do an experiment where you record the thermocouple output over time from a cold start and full heating power. From this graph you can do a curve fit and get a polynomial for the poles and zeros.
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nicleo
Joined: 06 Sep 2004
Posts: 717
Helped: 60
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| 05 Oct 2004 16:38 Heater simulation |
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| Another option is to use Fuzzy Logic technology. I notice that most of the heater (for bathroom) are built around Fuzzy Logic technology.
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davorin
Joined: 07 Jun 2003
Posts: 1490
Helped: 8
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| 05 Oct 2004 17:08 Re: Heater simulation |
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Well..the application is more delecate than that (o;
Generating a temperature profile for BGA soldering (o;
Or is there a way to extract the neccessary duty cycle for a specific temperature?
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JNekas
Joined: 11 Mar 2002
Posts: 331
Helped: 3
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| 05 Oct 2004 17:59 Heater simulation |
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Davorin, you can simulate transient response by using CosmosWorks, for example, or other FEM soft such as FEMLAB.
Then you may find transport delay (td) and get polynominal as flatulent writes. The transport delay is time from beginning of heating till beginning of temperature changing at the point where temperature sensor is installed. After this procedure you can use simulink to simulate your temperature stabilization system. A propos, FEMLAB may be used with simulink seamless.
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