Damper equations?

vvvv beta general
1

Does anyone know the equations/algorithm used by the VVVV Damper node? I am interesting in borrowing its behaviour for a C project.

2

thats gregsns paper about it: Oscillator Math

3

oh, unfourtunately the pictures are missing, maybe gregsn will upload it again…

4

Thanks. Looks great if it had the pictures.

5

A bit of experimentation suggests that the damper is a simple critically damped system of the type written up here.

6

not well formated but with all the info…
http://joreg.ath.cx/gregsn/tbof.html

hope that helps. ah and please tell me of your project!

7

the differential equation from wikipedia can be calculated efficiently by a Runge-Kutta integrator. plus you can add a disturbing function (ie value input). i can send you a java code, should be easy to convert to C…

8

Thanks. I had done a very crude approximation so an RK implementation would be better. I would be interested to see the Java. Perhaps you could attach it to the forum?

Thanks

9

ok, have to clean up first, tomorrow…

10

here it is. you have to set c1 and c2. they are the coefficients of x’ and x from this equation:

instead the 0 you set some force function in the ‘stoer’ method.
edit: download below

11

Thanks a lot. That is good fun.

I might well borrow your R-K implementation.

12

that was an exercise from my study. maybe i make a R-K node for vvvv, if i find a senseful input/output definition, which is a good generalization. here is it again with a better html for the applet:

Uebung03.zip (12.4 kB)