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> Usage of "outer" and "inner" mechanism in OM, Is the inner and outer feature already completely implemented?
post Feb 26 2009, 11:59 PM
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Posts: 4
Joined: 11-February 09
Member No.: 30,428

Hi All!

i plan to use that in my models and few simple examples are fine.
Then i tried this:

model AircraftOM
import ModelicaAdditions.MultiBody;
MultiBody.Joints.FreeMotion freemotion;
MultiBody.Parts.Body acstructure(m = 1, I11 = 0.05, I22 = 0.1, I33 = 0.05);
outer MultiBody.Parts.InertialSystem world;
end AircraftOM;

model Mission1OM
import ModelicaAdditions.MultiBody;
inner MultiBody.Parts.InertialSystem world;
AircraftOM aircraft1;
end Mission1OM;

Then, simulate(Mission1OM) leads to:
Too many equations, overdetermined system. The model has 84 variables and 90 equations

I think that should work. Removing "outer" and "inner MultiBody.InertialSystem" will make it work. The implementation of InertialSystem looks pretty simple as well and i dont know, what could be wrong there.

I know using inner and outer is not really necessary in this case because there wont be interactions between the aircrafts. But i plan to use it to for simulation of wind or wireless communications.


in order to get it run you need to change in MultiBody.Joints.FreeMotion (watch earlier posts)

when switch_state then
S_fix[1,1] = pre(S_rel[1,1]);
S_fix[1,2] = pre(S_rel[1,2]);
S_fix[1,3] = pre(S_rel[1,3]);
S_fix[2,1] = pre(S_rel[2,1]);
S_fix[2,2] = pre(S_rel[2,2]);
S_fix[2,3] = pre(S_rel[2,3]);
S_fix[3,1] = pre(S_rel[3,1]);
S_fix[3,2] = pre(S_rel[3,2]);
S_fix[3,3] = pre(S_rel[3,3]);
//S_fix = pre(S_rel); //ORIGINAL CODE
end when;
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