Brian Chapman

Brian Chapman

Academic Contractor and Pianist


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The lift door mechanism shown below is a simulation taken from the award-winning Engineering Mechanics CD-ROM produced for Monash University's Department of Mechanical Engineering.

The mechanism works in both automatic (default) and manual modes. Click the button to stop the motion. You will then be able to operate the doors by dragging the red pin on the crank in a circular motion in either direction.

During manual operation the screen objects are positioned by runtime solution of six nonlinear equations obtained from inspection of the client's line diagram. In automatic mode the screen objects are positioned by reference to a lookup table that was generated using these equations.


Move the sliding bars to see the effect of changing the mean and the standard deviation.

When changing the mean the overall shape remains the same, but the curve moves along the horizontal axis.

Larger standard deviations correspond to wider and flatter curves.