Items tagged with dynamicsystemsdynamicsystems Tagged Items Feed

Non-autonomous system of DE to autonomous...

June 17 2013 by Maple 16

0

6

Hi,

I'm searching for the third differential equation that will transform the following two equations non-autonomous system into a three equations autonomous one:

diff(x(t),t)=-x(t)+2*(m*t+n)*y(t)-2*k*(m*t+n)2

diff(y(t),t)=-y(t)+k*m-(m*t+n)*((x(t)/2)-1)

diff(z(t),t)= ...

Regards,

Johnny

Function transfer with direct method...

May 27 2013 by Maple

Hello,

I like to plot the Bode diagram of function transfer. For that purpose, i use Dynamicsystem package.

I obtain my transfer function by 2 different methods :
- direct method
- state space method.

The issue is the fact that i don't obtain the same results with the 2 methods.

Why does DynamicSystems recognise an...

January 16 2013 by Maple 15 MapleSim 5

1

5

hi,

I am trying to make a custom on maple but when i get an error on dynamicSystems saying:

> sys := DynamicSystems[AlgEquation](eq, inputvariable = [Altura(t)], outputvariable = [Teste(t)]);
Error, (in DynamicSystems:-AlgEquation) algebraic equations cannot depend on past/future values of the input/output

But if i change AlgEquation to diffEquation i get no error. I dont have any diff equation on the system. This is happening with one of the "equations":

What is the problem when in Dynamic...

October 30 2012 by Maple 15 MapleSim 5

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5

Hello. I am creating a custom component similar to the one that maplesoft has as an example (the discretized counterflow heat exchanger), but with some diff. The problem is that when i execute dyamic systems i get an error saying:

Error, (in DynamicSystems:-ParseSystemInputs) cannot match the arguments to an appropriate system

Is this a problem on my equation (something that i may have forget) or is another thing? Are the arguments type of dynamic system in the right "type"?

Combustion model

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1

hi,

I am trying to make a simple model of a combustion. To start i am just calculating the composition of the products for a complete combustion and flame´s adiabatic temperature. The equations used to solve the model are:

equations:
    nch4 = nco2;    2 * nar = 2 * nco2 + nh2o + 2 * no2;    7.52 * nar = 2 * nn2;    4 * nch4 = 2 * nh2o;    nch4 * hfch4 + nar(hfo2 + 3.76 * hfn2) = nco2(hfco2 + cpco2(Tad - 25)...

plotting using DEplot

February 13 2012 by

i have a differential equation like below

with(DynamicSystems):

with(DETools):

ivs3:=[y(0)=100,y(0)=250,y(0)=800]:

DEplot(sys1,y(t),t=0..1000,ivs3);

i tried to plot this diff equation but received an error message:

Warning, plot may be incomplete, the following error(s) were issued:

How to plot the Bode plot of this transfer...

June 21 2011 by Maple 15

0

5

> restart:   with(DynamicSystems):> sys := TransferFunction(1/((1+0.1*s)(1+0.002*s+0.0001*s^2)));> BodePlot(sys,range=10^(-1)..10^(3)); I get the following warning:

             Warning, transfer-function(s) are not rational-polynomial(s) in s Why?.. How can I make it work without any warning? Thanks everybody for help!



Equations of motion to state space

June 08 2011 by Maple 15

0

2

Hello:

I am in need of help with Maple Linearize and an exremely crypitc and most un-helpful error message. What does this mean:

> linmod := Linearize(syss, parm, linp);
Error, invalid input: Linearize uses a 4th argument, linpoint (of type {list(=), set(=)}), which is missing

I can find nothing in the help in this.

Linearize works fine when running a sample program from the help files, but fails when I run my equations.

Some warnings when using ResponsePlot...

March 05 2011 by

Hi,

I use maple to verify some examples in my textbook. The followings are two warnings which I came across.

1.

> with(DynamicSystems); sys := TransferFunction((1+.2*s)/(1+.1*s));
> ResponsePlot(sys, Step());

When running the codes above, a warning appears unexpectly.
Warning, cannot evaluate the solution past the initial point, problem may be complex, initially singular or improperly set up

With this question, I...

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