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vlehner1-Visitor
1-Visitor
February 23, 2017
Solved

System of Differential Equations - How to solve?

  • February 23, 2017
  • 6 replies
  • 4414 views

Hello,

Attached you can see a solve block with a system of Differential Equations.

Has somebody an idea what is wrong or is it a typical Prime-problem-if then it should be fixed in Prime 4.0?

I tried to solve completely without units but then i got the same error message again.

I am working with MathCad Prime 3.1

Thank you for your efforts.

regards

Volker

Best answer by -MFra-

Hi Volker,

what do you think about my solution shown in the following picture?

Lagrangesche.jpg

6 replies

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-MFra-21-Topaz IIAnswer
21-Topaz II
February 24, 2017

Hi Volker,

what do you think about my solution shown in the following picture?

Lagrangesche.jpg

V
vlehner1-VisitorAuthor
1-Visitor
February 24, 2017

Hi!

Wow, you got a solution.

you replaced x''(t) from the first Equation into the second Equation-and it works- can't belive it.

Why does MathCad don't accept my first solution?

Thank you!!!

-
-MFra-21-Topaz II
21-Topaz II
February 24, 2017

Hi Volker,

Perhaps to define two times the second derivative of the same function, it creates difficulties.

since the argument I always liked (Lagrange equations) could you give me a sketch of the mechanical system (which seems like a pendulum, or something like that)?

In any case Thanks.

FM

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