Double pendulum

[Fu-Kwun Hwang]

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This applet simulate motion of a double pendulum.



http://www.youtube.com/watch?v=QXf95_EKS6E

Registed user can get files related to this applet for offline access.
Problem viewing java?Add http://www.phy.ntnu.edu.tw/ to exception site list
If java program did not show up, please download and install latest Java RUN TIME

[Fu-Kwun Hwang]

Equation of motion for the above double pendulum.

if c1,c2 are angle for those two pendulums, w1,w2 are angular frequency for two pendulum. (1 is the upper one)
m1,m2 are mass for two pendulum. gravity is g=9.8m/s²
d(w1)/dt= -gravity*((m1+m2)*Math.sin(c1)-m2*Math.sin(c2)*Math.cos(c1-c2))/((m1+m2)-m2*Math.cos(c1-c2)*Math.cos(c1-c2))/L1;
d(w2)/dt= -gravity*(m1+m2)*(Math.sin(c1)*Math.cos(c1-c2)-Math.sin(c2))/(m2*Math.cos(c1-c2)*Math.cos(c1-c2)-(m1+m2))/L2;

[flower]

how i can get the code of this java stimulation for the double pendulum .please help me

[Fu-Kwun Hwang]

The above simulation was created/generated with EJS.
You can download the EJS source from the above link (You need to login to the forum) and open it with EJS.