Can two first order transfer functions be added together in matlab to make a second order transfer function

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Daniel
Daniel 2014-2-4
评论： Azzi Abdelmalek 2014-2-4
As the title says is this possible I have
g=(31.2)/(155*s+1)
and
g1=(4)/(172*s+1)
if i then do
g2=(g+g1) does this give the correct second order tf

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回答（3 个）

Daniel
Daniel 2014-2-4
Thanks so that also means putting two first order transfer functions in series on simulink does not make it a second order system?
Given the two transfer functions i have for two responses to level and pressure when a given step change was implemented in a valve how would i make this second order transfer function
Paul
Paul 2014-2-4
编辑：Paul 2014-2-4
Yes, unlike Mischa said you do get a second order tf because g and g1 do not have a common denominator. The result is:
g2 =
5986 s + 35.2
---------------------
26660 s^2 + 327 s + 1
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Paul
Paul 2014-2-4
Depends on what you do. Add them and you get this one, multiply and you get the 124.8 one. In the question Daniel said he wanted to add them, but in a reply he said he wanted two transfer functions in series so you have to multiply.

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Daniel
Daniel 2014-2-4
spot on that thanks lads

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