# Question about damping oscilation

**URL:** <https://forum.kirupa.com/t/question-about-damping-oscilation/154437>\
**Category:** Uncategorized\
**Created:** [July 9, 2005, 8:39pm UTC](https://forum.kirupa.com/t/question-about-damping-oscilation/154437 "2005-07-09T20:39:43Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![engghost](https://avatars.discourse-cdn.com/v4/letter/e/e5b9ba/32.png) [@engghost](https://forum.kirupa.com/u/engghost)\
**Post date:** [July 9, 2005, 8:39pm UTC](https://forum.kirupa.com/t/question-about-damping-oscilation/154437/1 "2005-07-09T20:39:43Z")

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hi every body  
this is my 1st time to type in this facinating forum  
i’m not profesional in AS , so i need any help to learn it  
so … my problem is :  
i want to make the oscilating motion with flash  
general form of damping oscilation motion is  
x=A\*e^(-bt/2m)cos(w’+phy)  
x : the displacement  
A : the ampletude “max displacement”  
e : ohiler’s No.  
b,m : constantes  
t : time  
w’=(w^2-(bt/m)^2)^0.5  
w=(k/m)^0.5  
note: i use “^” as the power not XOR  
so …  
i open Flash … make 4 text types for A,b,m,and k … i condider phy=0  
and opposite of these static texts i made 4 input texts and typed it its var  
A,b,m and k , respectively  
and insered a square movie clip named “spring”  
then i go to the AS panel in frame 1 and typed this action:

```auto
 
 
w=Math.pow((k/m),0.5);
term=b/(2*m);
under=Math.pow(w,2)-Math.pow(term,2);
w_dash=Math.sqrt(under);
e=Math.E;
t= //the problem is in it 
pow_of_e=(-1*b*t)/(2*m);
x=A*Math.pow(e,poe_of_e)*Math.cos(w_dash);
 
spring.onMouseUp=function(){
spring._xscale += x ;
}

```

finally finish  
tip:when i replaced the “x” in the last function with any No. then test the movie and click on the movie clip it become wider  
but if i let it x no thing happen  
whatever the value of t (eg. 100)  
so i think Flash didn’t calculate the value of x

the 2nd problem that i want to make the value of t changed every second so that x will be positive then redueces to be zero and then negative  
i don’t know how to tie the value of t with seconds 😕

please help me ☹