Bendesarts

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These are questions asked by Bendesarts

Hello,

I have difficulties to solve a small linear system.

I attach my code. It may be due to derivate variables but i'm not sure. I remember having solve before similar systems.

Analyse_cinematique_test2.mw

May you have a look at my code and tell me why the solve function doesn't return any results ?

Thank you for your help.

Hello,

I have a set of 8 kinematic constraints.

I would like to express them into the following form Jxdq with J the jacobian matrix.

I attached my code.

the 8 equations are gathered in SysEq

Thanks a lot for your help

Analyse_cinematique_test.mw

Hello,

I have two functions :
x(apha1,alpha2)
y(alpha1,alpha2)

When alpha2 is fixed, i can make a parametric plot to see the evolution of the point M which have the coordinates (x,y).

Consequently, 

for alpha2 = 30°, i can plot 

plot([eval(X(alpha1,30*Pi/180)),eval(Y(alpha1,30*Pi/180)),alpha1=-30*Pi/180..30*Pi/180],-1..1,-1..1);

for alpha2 = 25°, i can plot 

plot([eval(X(alpha1,25*Pi/180)),eval(Y(alpha1,25*Pi/180)),alpha1=-30*Pi/180..30*Pi/180],-1..1,-1..1);

for alpha2 = 20°, i can plot 

plot([eval(X(alpha1,20*Pi/180)),eval(Y(alpha1,20*Pi/180)),alpha1=-30*Pi/180..30*Pi/180],-1..1,-1..1);

and so on ...

I would like to plot these different parametric plots with a increment of 5 degrees for alpha2 from 30° to -30°. But, i would like to gather all the plots on the same plot.

I attach my code. My attempt with a for loop doesn't work.

How can i do such a plot (gathering several parametric plots) ?

Thank you for your help.

Analyse_cinematique_vehicule_4D_28.01_test.mw

 

 

 

Hello,

I could build the table routh of the characteristic equation of the system by using the function RouthTable( )

I try to find the stability conditions as fonction as the gain g. For that purpose, i have to solve some inequalities.

Each terms of the first column of the routh table should be positive.

I would like to find the conditions on the gain g so that my system is stable.

In order to solve the inequalities as function of g, i must assume the mass, and the spring to be positive. I'm not sure that i have well assumed the parameters to be positive.

Have you some ideas to solve my inequalities and find symbolically the conditions of the gain g? 

I attach an extract of my code.

Thank you for your help

Extract of my code: 

SolvingTableRouth.mw

 

 

Hello,

In the maple.ini, i defined some folders where i have put my packages.
It seems that, when I made some altercations in the maple.ini, they are not taken into account immediately.
Do you have ideas about when the update of the maple.ini is taken into account ?
And how can I force the update ? Should I restart my computer so that the update of the file is taken into account ?
Thanks a lot for your feedback.

 

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