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ptc-57292991-Visitor
1-Visitor
March 11, 2014
Solved

Odesolver problem

  • March 11, 2014
  • 1 reply
  • 2646 views

Hello,

I try to solve a differential equation with the Odesolver.

Unfortunately I don't know how to continue.

It is written, that the variable v.1 in the solution matrix must be a function but it is now any1.

Maybe I just made a small mistake, but I can't find it out.

Thanks for your help

Adrian

p.s I added a Screenshot

Best answer by StuartBruff

I suspect a major part of the problem with this ODE is the relative magnitudes of the numbers involved - F.kolb is very small for all values of t. Re-arranging to put v' on the rhs by itself produces a result; how sensible it is is another matter ...

Stuart

1 reply

W
Werner_E25-Diamond I
25-Diamond I
March 11, 2014

Please post your sheet, not just a pic

We don't see how you had defined the function F().

Try to keep the derivatives on the LHS

P
ptc-57292991-VisitorAuthor
1-Visitor
March 11, 2014

Here is the file.

A
AndyWesterman12-Amethyst
12-Amethyst
March 11, 2014

Hi,

There are a few things that mathcad can't handle in your file.

1. definition for Ihub still has units.

2.You cannot define boundary conditions other than at the start or end of the solve block

So v(0)=0 or v(0.05)=0 would be OK

v(1/75/4)=0 (or (v(0.053) ) isn't.

3. Mathcad needs the differential equations in a standard form d/dx (f(x)= g(x).

Otherwise I think that the problem becomes too ill defined.

Regards

Andy

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