Simple models have been used to capture the primary behavior of certain degrees of freedom in aircraft, automobiles, and other complicated systems. Many experiments have used the simplest controlled elements with position, velocity, and acceleration responses.
All controlled elements included in the library are shown in the above table. There are the basic position, velocity, and acceleration responses. There are also versions of these basic responses with an added first-order lag, making them less responsive at first, but eventually reaching the same steady-state position/velocity/acceleration.
The unstable FirstOrderDivergent controlled element was used to investigate limitations of a human's effective time delay in Jex et al. (1966). The VelocityFlexibleMode includes a second order mode that can be oscillatory. This controlled element was studied with relatively high damping in Shirley and Young (1968), and with very low damping in Potter and Singhose (2013).
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