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i want to get the overall transfer function of the parallel conncected transfer functions blocks

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deekshith
deekshith 2024-3-31
回答： Sam Chak 2024-3-31
num1=[576 288];
den1=[4.8 34.992 73.392 1504.8];
num2=[57.6 230.4 -288];
den2=[249.831 1938.651 1742.688 -8162.8476 -11905.033 -241];
num3=[167.40 837.04];
den3=[57.708 179.307 1921.539 3712.548 1662.54];
>> [num,den]=parallel(num1,den1,num2,den2,num3,den3);
and iam getting this error Error using parallel (line 158)
Wrong number of input arguments for obsolete matrix-based syntax.

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采纳的回答

Sam Chak
Sam Chak 2024-3-31
Hi @deekshith, Check if this works for you.
%% Transfer function 1
num1=[576 288];
den1=[4.8 34.992 73.392 1504.8];
G1 = tf(num1, den1)
%% Transfer function 2
num2=[57.6 230.4 -288];
den2=[249.831 1938.651 1742.688 -8162.8476 -11905.033 -241];
G2 = tf(num2, den2)
%% Transfer function 3
num3=[167.40 837.04];
den3=[57.708 179.307 1921.539 3712.548 1662.54];
G3 = tf(num3, den3)
%% Transfer functions in parallel
G = parallel(parallel(G1, G2), G3)
G = minreal(G)
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deekshith
deekshith 2024-3-31
%% Transfer function 1
num1=[576 288];
den1=[4.8 34.992 73.392 1504.8];
G1 = tf(num1, den1)
%% Transfer function 2
num2=[57.6 230.4 -288];
den2=[249.831 1938.651 1742.688 -8162.8476 -11905.033 -241];
G2 = tf(num2, den2)
%% Transfer function 3
num3=[167.40 837.04];
den3=[57.708 179.307 1921.539 3712.548 1662.54];
G3 = tf(num3, den3)
%% Transfer functions in parallel
G = parallel(parallel(G1, G2), G3)
G = minreal(G)
by using this code i got the answer but while iam entering the denominator values i'm getting error

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更多回答（1 个）

Sam Chak
Sam Chak 2024-3-31
@deekshith, Oh I see. Because you left the spaces. Either you ensure no spaces, or place commas (,) between the elements.

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