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S
ssato15-Moonstone
15-Moonstone
July 26, 2019
Solved

Circuit equation

  • July 26, 2019
  • 5 replies
  • 8710 views

Hello everyone

 

I can not find the solution M of the attached equation. (mathcad 15)

[undefind] is displayed.

 

Please give some advice on what this means.

Best answer by Werner_E

Simply don't use the symbolic evaluation after minerr

B.png

5 replies

L
LucMeekes23-Emerald IV
23-Emerald IV
July 26, 2019

Here's an example of circuit analysis with Mathcad:LM_20190726_Circuit.png

(I generally first try to solve symbolically, afterwards I can fill in the numbers)

Success!
Luc

S
ssato15-MoonstoneAuthor
15-Moonstone
July 26, 2019

Hello Luc san

 

Thanks your quick response.

 

I can not solve  symbolically my problem.

 

I attached file.

L
LucMeekes23-Emerald IV
23-Emerald IV
July 26, 2019

Hello Ssato san,

 

I cannot read your file directly,

Please save as Mathcad 11 .mcd file and attach.

(do not care about any warnings when saving).

 

Luc

A
AlanStevens19-Tanzanite
19-Tanzanite
July 26, 2019

Because your initial equations are linear in the currents, I1, I2 and I3, they can be rearranged in matrix form and solved as in the attached  (I first manipulated the equations a little before putting them into matrix form).

 

Alan

 

S
ssato15-MoonstoneAuthor
15-Moonstone
July 28, 2019

Alan san

 

Thank you for your response.

I understood your method.

 

 

W
Werner_E25-Diamond IAnswer
25-Diamond I
July 26, 2019

Simply don't use the symbolic evaluation after minerr

B.png

S
ssato15-MoonstoneAuthor
15-Moonstone
July 28, 2019

Hello Werner-E san

 

Thank you for your response.

 

What is it?....

 It was a rudimentary mistake.

 
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-MFra-21-Topaz II
21-Topaz II
July 28, 2019

Hi ssato,

Using the "direct network inspection" method. In my previous analysis, there was a mistake (I forgot to calculate a parallel) that now I've corrected.  (I renamed the passive and reactive components but the values correspond), and using the Minerr function in the solution block, I obtained these results :

network 222.jpgnetwork 223.jpgnetwork 224.jpgResults 1.jpgResults 2.jpg

 

    S
    ssato15-MoonstoneAuthor
    15-Moonstone
    July 29, 2019

    Hello Topaz san

     

    Thank you for your response.

     

    Topaz
    -
    -MFra-21-Topaz II
    21-Topaz II
    July 29, 2019

    Hi ssato,

    you will find the complete xmcd worksheet in my previous post.

    Results 1.jpg

    Results 2.jpg

    It was fun. Many greetings, Francesco

    S
    ssato15-MoonstoneAuthor
    15-Moonstone
    July 30, 2019

    Hello MFranc san

     

    I'm intersted in your post. You solve without cicuit equations.

    But it is difficult for me...

     

    -
    -MFra-21-Topaz II
    21-Topaz II
    July 30, 2019

    Hi Ssato,

    the one I applied, in fact, is one of the most used procedures for small passive or active electrical networks. The generalized Ohm's law V (s) = Z (s) I (s) is applied.

    Sincerely 

    Franc

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