Natural frequency calculation of mechanical structures

[klaus]

I submit a program to calculate natural frequencies and eigenvectors of mechanical structures for vibration analysis. The purpose of knowing these frequencies is to check if there is any risk of resonance with excitation frequencies from external forces.

I enclosed a short user’s guide that explains the program and some very basic theory of mechanical dynamics. I will send it in a second thread because of it's size.

If there is any interest, the user’s guide could be translated to French and German.

Any positive critic, improvement suggestion and bug report is of course welcome.

The program is relatively slow on the device, but with version 6.00 of Basic4ppc hopefully it could speed up. Probably from the code point of view I have not used all the potential of Basic4ppc, I don't know yet all the possibilities.

Klaus
Switzerland

Update 2008.01.21
The program has been updated for the new compiler, thanks to agraham who made run the Eigenvalue routine once again.
Speed increase for the calculation 8 times !
Klaus Switzerland

[dzt]

A very

[alfcen]

Hallo Klaus,
Geez, 4600 lines of code! That does require a geat deal of patience and diligence. I am not really familiar with the subject, but your UI design (realized on a single form!) is one of the most eye-pleasing in this subforum. Beautiful, well ordered, intuitive, technical but not cluttered.
Heartful congratulations!
Robert

[klaus]

Hello Dimitri and Robert

Thank you for your nice comments.

Robert, a big part of the code existed from a program on the desktop in VB.
So I knew exactly what I wanted and all the functions and elements I needed.
Nevertheless, I have rewritten a lot of it, the graphic handling and control is specific to the PPC. The functions copy and cut work even better now in the PPC program.

Best regards
Klaus

[alfcen]

Hallo Klaus,
I have ported several applications from VB6 and embVB myself and know what amount of work, time and testing us involved. I do not withdraw a single word of my compliments to you Personally, I believe that screen design is quite an important issue. Your UI design sense is impressive, indeed.
All the very best, Klaus.
Robert