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- FourBar:
-
- FourBar is a Mechanical Engineering application that is used to
- illustrate the motion of four bar linkages. The software is currently
- being developed for use in an Elements of Mechanisms course offered at
- Washington University in St. Louis.
-
- FourBar is developed under NeXTStep 2.0.
-
- The FourBar program is FreeWare and it may be freely distributed to
- whomever. However, I do NOT take any responsibility for its use. I
- am currently developing new versions on this software. If you would
- like to recieve the latest versions and be added to the mailing list
- please send US$10.00 to the below address. Thanx.
-
- How it works:
-
- Animate:
- The Animate button drives the crank link of the linkage.
-
- Animate Window:
- The linkage can also be modified using the mouse. The
- user can click on one of the joints and drag it to a new location.
- This will update the Control Window and the classification text.
-
- Controls:
- The Control Window allows the user to specify the link
- lengths and the starting angles of the mechanism. If the linkage can
- not be assembled in the desired configuration then garbage appears on
- the screen.
-
- Configurations:
- The Configuration buttons allows the user to change
- the linkage from the open to the cross configuration. If you do not
- understand just try it.
-
- Set:
- The Set button retrieves the current linkage position and stores it.
-
- Revert:
- The Revert button restores the linkage to last "Set" position.
-
- Draw:
- The Draw button draws linkage using the current values in the
- Control Window.
-
- BUGS:
- I don't know of bugs that will cause major problems. However,
- in the animation if the user tries to animate a double change point
- linkage which has one of the long links a ground and the other long
- link as the crank the animation is not smooth. Also if the user tries
- wierd orientations of the ground link the animation may fail - sorry.
- I am working on these. If you find any other bugs please let me know.
-
- This is my first time doing this so I am not making any promises. If
- you have any comments or suggestions I would appreciate hearing from
- you.
-
- Thanx,
- Jim.
-
- Jim Lammers
- Campus Box 1185
- Washington University
- St. Louis, MO 63130
- 314.481.6161
- jal@coven.wustl.edu
-
-