sjoegele

a double pendulum simulator

‘Sjoegele’ ([ˈʃuɡələ]; Limburgish: swinging) simulatates a double pendulum. [Wikipedia article] You can use this for generating smooth chaotic control voltages.

You can set the length of the rods, the gravititational acceleration and the coefficient of friction with the corresponding knobs and inputs. The gravity knob has labels for the surface gravitiy of Pluto, the Moon, Mercury, Earth, Jupiter and the Sun. [Wikipedia article] The length and gravitiy parameters are set when the ‘start’ button is hit, or the corresponding input receives a gate. These parameters cannot be changed on the fly, but the friction parameter can. On “start”, both masses are set to an angle θ = π.

The four “x” and “y” outputs give the x and y positions of the masses; the x outputs as bipolar (–5 to 5 V) signals, the y outputs as unipolar (0 to 10 V) signals. The two “θ = 0”outputs give a high gate when the angle θ is 0. (They go low again when either θ = π or dθ/dt = 0.)

Sjoegele works with polyphony. The number of channels is determined by the maximum number of channels at the four inputs.