- pendula.exe
- pendula.txt
- egavga.bgi
- or write: [hetrick@physics.arizona.edu]
Pendula 1.0
Copyright (C) 1995 James E. Hetrick
*** This software is under developement! ***
*** Check again soon for a new version ***
Pendula simulates the coupled pendulum problem, with two equal length
and equal mass rods.
Pendula uses a 4th order Rung-Kutte algorithm to integrate the equations
of motion derived from the Lagrangian of the system. A PostScript
version of this computation should accompany the Pendula package
shortly (look for it where you downloaded this package).
It requires a mouse and EGA or better graphics.
To run Pendula, simply type
pendula
Command line options are:
pendula [timestep]
pendula [theta_1] [theta_2]
pendula [timestep] [theta_1] [theta_2]
where:
timestep, determines the speed of the simulation. Typical
speeds are 0.0005 for a 60 Hz 486. The default (for
my laptop, where this was written, is 0.025, and is
apt to be far too fast on most modern machines).
theta_1, is the angle (in degrees) of the inner rod from the
horizontal, ie. theta_1 = 0 is pointing directly to
the right.
theta_2, is the the angle of the outer rod, measured from the
the inner rod. Thus theta_2 = 0 means the rod is
folded, while theta_2 = 180 is fully extended.
The menu bar contains:
File: (does nothing yet, although the EXIT option works)
Display:
Clear -- clears the screen
Trace 1 -- toggles Trace of the end point of the inner rod
Default is OFF
Trace 2 -- toggles Trace of the end point of the outer rod
Default is ON
Configurations:
Several starting configurations for the rods.
Run: Run simulation. *Hitting ANY KEY STOPS the simulation*
Note that moving the mouse during simulation can cause anomolous screen
writes. This is because the simulation part of the program isn't yet
a fully interactive object, which will be remedied soon.
Pendula was written in C++. It is very much in the developmental
phase and your comments are welcome. Please check again soon for a new
version.
J. E. Hetrick Dec. 1995
hetrick@physics.arizona.edu
http://www.physics.arizona.edu/~hetrick
Dept. of Physics and Astronomy
University of Arizona
Tucson, AZ 85721
More Sample Screens:
Jim Hetrick [ hetrick@physics.arizona.edu] Last modified: Mon Dec 11 13:09:02 1995