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"In theory, theory and practice are the same. In practice, they are not." ..."Albert Einstein (1879~1955, Mathematical physicist, Nobel Prize 1921-Physics)"
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Author Topic: Double pendulum  (Read 37598 times)
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Fu-Kwun Hwang
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on: June 07, 2005, 03:42:03 pm »

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This applet simulate motion of a double pendulum.



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


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Fu-Kwun Hwang
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Reply #1 on: April 21, 2008, 10:22:31 am »

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;
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Reply #2 on: January 28, 2012, 07:35:31 pm » posted from:Beirut,Beyrouth,Lebanon

how i can get the code of this java stimulation for the double pendulum .please help me Wink
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Fu-Kwun Hwang
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Reply #3 on: January 28, 2012, 08:45:52 pm »

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.

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