Export transfer function model to workspace from Simulink without linmod

2013 10 14
1 个回答
更新时间：2020 8 13
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I want to export the trasfer function of a simple simulink program to the workspace. I know it can be done simply by using the commands
[a,b,c,d]=linmod('model')
sys=ss(a,b,c,d);
tf(sys)
Is there any way to avoid the linmod command? The reason I need to do this is to present this method for people who are not familiar with state-sspace models.

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回答（1 个）

Azzi Abdelmalek
Azzi Abdelmalek 2013-10-14
编辑：Azzi Abdelmalek 2013-10-14

0 个投票

Edit
Your model name is transfer, and you have two transfer function named Transfer Fcn and Transfer Fcn1
To get the parameters of Transfer Fcn block
num=get_param('transfer/Transfer Fcn','Numerator');
den=get_param('transfer/Transfer Fcn','Denominator');
model=tf(str2num(num),str2num(den))

8 个评论
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Lazaros Moysis
Lazaros Moysis 2013-10-14
Though this is helpful, I actually want to get the trasfer function of the whole system (in this case the series connection), not just the tf of a single block.
Azzi Abdelmalek
Azzi Abdelmalek 2013-10-14
num=get_param('transfer/Transfer Fcn','Numerator');
den=get_param('transfer/Transfer Fcn','Denominator');
num1=get_param('transfer/Transfer Fcn1','Numerator');
den1=get_param('transfer/Transfer Fcn1','Denominator');
model=tf(str2num(num),str2num(den))
model1=tf(str2num(num1),str2num(den1))
modelg=model*model1
Lazaros Moysis
Lazaros Moysis 2013-10-14
编辑：Lazaros Moysis 2013-10-14
You do not understand the point of my question sir. If i am to do all this, of course i might as well not use simulink at all. The question is how can i get the transfer function of a simulink model, without having to use the linmod and the ss command. The model in question could be 10 times more complex, the question remains the same
Azzi Abdelmalek
Azzi Abdelmalek 2013-10-18
When you read the help of linmod, nothing is referring to an equivalent function, which make me think there is not another way. I think also Its the way simulink stores your model (linear or non linerar), even when you use a transfer function, I think, simulink stores it as state space representation.
Lazaros Moysis
Lazaros Moysis 2013-10-18
Yes this is what i think too, that the models are generated as state-space representations, but since simulink has too many different paremeters to check, I thought maybe there was a way i did not know.
haryana thomas
haryana thomas 2018-8-21
you should type this command in the matlab command line.
plant = linearize('name of simulink model')
tf(plant)
Raja Singh R
Raja Singh R 2020-8-13
Thomas, It is showing empty transfer function

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