Animating complex shapes

[harryhaller]

Hello,

I don't know if this is the right forum for this.

I would like to animate some mode shapes, at the moment I have written my program so that it uses cos(real part of mode shape) + sin(imaginary part of the mode shape). This indeed produces a shape which seems correct, but when I compare my complex mode shapes to those in a commercial modal analysis program(mescope) the shape at 0 degrees( when the shape should be entirely imaginary?) looks slightly different than mine, although using the same data.

Many thanks in advance

Harry

 

[Twoballcane]

Hmmm what software are you using?

Tobalcane
"If you avoid failure, you also avoid success."

 

[harryhaller]

I've written my own software. I'm comparing it against Vibrant technology's Mescope.

 

[harryhaller]

Please ignore the formula in the first post, thats not what I've written, I didn`t have the code in front of me when I wrote my original post, my brain must need defragmenting.

My code goes as follows

degrees = 0 to 360 in 10 degree steps

real(mode shape) * cos(degrees) + imag(mode shape)*sin(degrees)


Many thanks

Harry

 

[sreid]

If you want to get the magnitude from Re and Im data, you need to take the square root of the sum of the squares of the magnitudes.

 

[cbrn]

... and the phase is arctan(Im/Re).