Hello to whole community,

I am working on a spreadsheet to calculate the response of a cantilever beam VIA a simple F.E.M solver.

I would like to find a solution to modify the part in yellow in the linked spreadsheet, as i dont like its presentation (string and var manipulation).
Modal analysis.sm (85,46 KiB) scaricato 1703 volta(e).
Please dont focus on the presentation, it is still an ongoing work

However, i would be glad, if any mistake or optimisation (not liked to my question) is raised.

Thank you

Hi. This could be an option.

Modal analysis.sm (88,41 KiB) scaricato 1676 volta(e).



Best regards.
Alvaro.

Sometimes I don't understand how it works anymore. The symbolic form of ODE was implemented for simpler expressions. It surprises me that this form of notation calculates anything.

Thank you Alvaro for your answer.

That cleaner

Another point is: I dont get why i can't use the diff(f,x,i) function in this specific case. Is it due to some way diff function and ' are coded?

Regards,

Pierre

Wrote

...
Another point is: I dont get why i can't use the diff(f,x,i) function in this specific case. Is it due to some way diff function and ' are coded? ...

Hi. I don't know the internals of the Viacheslav plugin. But, in any case, you can see how difficult it is to describe the initials conditions with the diff notation in other languages, like maple or mathematica, checking the help of dsolve functions.

BTW, the plugin looks like a very powerful tool. For instance, in this file you can find how to solve your system with the classical D(t,x) runge kutta notation.

Modal analysis.sm (102,28 KiB) scaricato 1711 volta(e).

I guess that the plugin can handle your system because it is lineal and uncoupled. You can see a try to use the mathcad block for solving hard coupled systems at the end of the first post of the Mathcad toolbox, https://en.smath.com/forum/yaf_postst726_Mathcad-Toolbox.aspx , in the files RKA.

Best regards.
Alvaro.