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nkarna1-Visitor
1-Visitor
Jun 3, 2015 2:15 PM UTC
Question

Solving two simultaneous differential equations and need to plot them wrt to time .


Hello all,

I am currently trying to solve two simultaneous equations and they are dependent on multiple variables . I could not solve them and simultaneously and also have to use the output of them to make an input for other and try to iterate and optimise it . I have removed all the units as I was facing problem with a couple of them . so just I m working with plain numbers .

Can some one please help me ..

I am kind of on intermediate level in mathcad prime

Nitin

11 replies

RichardJ19-Tanzanite
19-Tanzanite
Jun 3, 2015 5:26 PM UTC

Sorry, that's a Prime 3.1 file, so I can't read it. If you post a pdf maybe I (or someone else that does not have Prime 3.1) can help.

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nkarna1-VisitorAuthor
1-Visitor
Jun 3, 2015 5:32 PM UTC

Thanks a lot for the reply , please find the attached xps file for the same

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RichardJ19-Tanzanite
19-Tanzanite
Jun 3, 2015 10:26 PM UTC

I assume the two equations you want to solve are M(h) and U(h). You have two definitions of M(h). For the first, you define it as d/dt(h), but since h is a constant that's 0. Your definition of U(h) includes an undefined variable T, and d/dt(omega_rel), but you have defined omega_rel as a constant, not a function of t, so the derivative is 0. Even if you define the variable T and fix the definition of omega_rel the variable h will not appear on  the rhs of the equation though, so the value returned by U(h) will be constant. Lastly, you are using odesolve in the solve block, but you do not have differential equations.

Please specify exactly the form of the two equations you wish to solve, and which two variables you wish to solve for.

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