Estimation of Input to Transfer Function

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Omar Khalifa
Omar Khalifa 2020-4-20
评论： Ameer Hamza 2020-4-21
Hello,
I want to control 220V 100 Watt "Band Heater", to apply 160 degree celsius on load and control it using PID Controller using on/off Relay, so in order to get Transfer function for this system, i applied 220V to the
heater and record the output values in array and send them to MATLAB, but in order to get transfer function i have to specify input/output for the system, so i specify the output(temperature), but i couldn't specify the exact input to the system. So my question is:
What is the exact input to this system in order to identify it in MATLAB?

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回答（1 个）

Ameer Hamza
Ameer Hamza 2020-4-20
Since you applied a constant voltage of 220V, so you should create a vector with all values 220 and the same size and y2. Then use it as input for transfer function estimation.
x2 = 220*ones(size(y2));
define this in MATLAB workspace, and input x2 in the input field.
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Omar Khalifa
Omar Khalifa 2020-4-20
编辑：Omar Khalifa 2020-4-20
Alright, i understand that i should give Band Heater enough time to make the temperature curve becomes horizontal. I hope this will fix my problem.
Once again, thank you very much for your help.
Ameer Hamza
Ameer Hamza 2020-4-21
Correct. That will give enough data to estimate an accurate transfer function.

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