MaplePrimes - MapleSim 4 Posts and Questions

Model preparing and integration process in MapleSim

Macrohard — Mon, 24 Oct 2011 12:34:45 Z

Hello!

Could you pleasу tell me, is it possible to make MapleSim not to simplify equation set of my model and solve equations without simplification? I want to do this because simplification process (reduction of equations number) takes too much time in comparison with integration process.

Thank you!

How can i use a dynamic model doing in maple in maplesim

Jorgenecochea — Tue, 21 Jun 2011 22:54:03 Z

I have a problem.

I don´t know how can i do for working with a dynamic model equation was done in maple in Maplesim?

Help me please

Maplesim Excel Import

Matphysics — Tue, 31 May 2011 22:46:50 Z

How do I import/export excel into Maplesim? Also how do I view mpld data files? I tried viewing mpld files using maplesim and maple 14 but it didn't work.

Model integration

Macrohard — Wed, 18 May 2011 12:37:42 Z

Hello!

I've got a question about model integration process.

I've tried to solve quite complex mechanical model and this messages have appeared.

Computing initial conditions...
Iterate re-initialization...
done.
Simulating...
CreateDataRecord: using dsolve method=rosenbrock_dae
Generating configuration 1
Integrating configuration...
Re-initializing after event at t=4.94271387307997e-009
Generating configuration 2
Integrating configuration...

And so on. Integration process takes a lot of time.

What shall I do with this? Is it possible to tune solver to avoid this problem?

Thank you!

Measure Force by Force and Moment in MapleSim

tratilu — Thu, 21 Apr 2011 16:56:51 Z

Hi everyone.. Now, i learn Maplesim.. I want measures force between 2 frame(a and b). which are connected by prismatic joint.

But a force and moment sensor acts as a weld joint.. so althought i measured force but frame b can't move.

who can solve my problem??

thank very much!!!

PS: i want measure force 2 frame to calculate the friction between them.

Solving ODE system

Macrohard — Wed, 30 Mar 2011 12:58:53 Z

Hello!

I'm trying to solve numerically an ODE system with piecewise. And this piecewise is very important for this task.

This system describes behavior of a pulley with friction. There are some constants: m, c, g, mu and J. Values of this constants are not important.

> sys := m*a(t) = piecewise(a(t) < a0, F0*time, a(t) >= a0, 0), v(t) = diff(x(t), t), a(t) = diff(v(t), t);
> m := 5; F0 := 10; a0 := 5;
> initialconditions := x(0) = 0, v(0) = 0;
> dsolve({sys, initialconditions}, numeric);
Error, (in dsolve/numeric/DAE/explicit) unable to obtain the standard form of the DAE system due to the presence of leading dependent variables/derivatives in the piecewise: -5*a(t)+piecewise(a(t) < 5, 10*time, 5 <= a(t), 0)

What can I do with this? Can I use another Maple-function to solve this ODE or is there no possibility to solve such equations numerically?

Thank you!