ivar_kjelberg

Mr. Ivar KJELBERG

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19 years, 222 days
Private
Retired Senior Expert
Yvonand, Vaud, Switzerland

Social Networks and Content at Maplesoft.com

Now retired, since 2019, but still "consultant", my last post was "Senior Expert" at CSEM SA in Switzerland. With 30+ years of experience in mechatronics developments in the frame of complex, multidisciplinary, high tech "systems engineering" activities. Previous posts were "Senior Project Manager, Section Head, Project Manager, Quality Engineer, R&D Engineer. CSEM is a retained profit company, a "High Tech", R&D Institution, closely linked to the EPFL (Ecole Polytechnique Federale de Lausanne), we are located in Neuchatel Switzerland. We use advanced tools such as Maple(r), MapleSim(r) and COMSOL Multiphyiscs(r) for our developments and for our Ph.D. training activities.

MaplePrimes Activity


These are replies submitted by ivar_kjelberg

@Joe Riel 

Thnaks for the precisions Joe

I will take some more time to study the Modelica outputs then, but for me most of my simulations are a mixture of algebraic equations and block build items (the later typically for a mechanical geometry/structure). But everything can not easily be put into blocks, I need the equation inputs. I.e I have a non-linear spring (linking two parts of my structure) that depends on the local position of my structure. This implies acting on the spring constant k(x), I do not see how to get around only by adding forces ;)

Well more work for me, it will not be as easy as hoped, but lets see the nice side, I'll learn something new ;)

Thanks again

Ivar

@Joe Riel 

Thnaks for the precisions Joe

I will take some more time to study the Modelica outputs then, but for me most of my simulations are a mixture of algebraic equations and block build items (the later typically for a mechanical geometry/structure). But everything can not easily be put into blocks, I need the equation inputs. I.e I have a non-linear spring (linking two parts of my structure) that depends on the local position of my structure. This implies acting on the spring constant k(x), I do not see how to get around only by adding forces ;)

Well more work for me, it will not be as easy as hoped, but lets see the nice side, I'll learn something new ;)

Thanks again

Ivar

Hi Joe

Well then I'm missing some of the interest in MapleSim, I need to be able to loop my variables such that i.e I have a spring constant "k" that changes with position, or that I adapt a value as function of time.

for me the variables x,y,z and t should be adressable in my variables. For x,y,z I need to ba able to use my own references too, I can set a relative position sensor, but then I ne to feed it back into a variable of another block

Ivar

Hi Joe

Well then I'm missing some of the interest in MapleSim, I need to be able to loop my variables such that i.e I have a spring constant "k" that changes with position, or that I adapt a value as function of time.

for me the variables x,y,z and t should be adressable in my variables. For x,y,z I need to ba able to use my own references too, I can set a relative position sensor, but then I ne to feed it back into a variable of another block

Ivar

Thanks,

this work-around looks great, it will save me hours of clicking

I hope Maple will add soon a global plot time axis selection in their plot window, as often one want to skip the first 1-2 periods to leave your system settle (and to avoid the spikes that scales your graphs out of usefull range)

So long

ivar

Thanks,

this work-around looks great, it will save me hours of clicking

I hope Maple will add soon a global plot time axis selection in their plot window, as often one want to skip the first 1-2 periods to leave your system settle (and to avoid the spikes that scales your graphs out of usefull range)

So long

ivar

And if I have a piecewise function (continuous derivable to the "jerck"), depending on a several line internal function, how can I get that into a block such to replace the simpel "real-signal Sine" block ?

Because none of the templates are right fo that, I have a function not a series of data points, nor a PDE

 

Thanks in advance

Ivar

And if I have a piecewise function (continuous derivable to the "jerck"), depending on a several line internal function, how can I get that into a block such to replace the simpel "real-signal Sine" block ?

Because none of the templates are right fo that, I have a function not a series of data points, nor a PDE

 

Thanks in advance

Ivar

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