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Terminal sliding mode
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Terminal sliding mode : ウィキペディア英語版
Terminal sliding mode

In the early 1990s, a new type of sliding mode control, named terminal sliding modes (TSM) was invented at the Jet Propulsion Laboratory (JPL) by Venkataraman and Gulati.
The main idea of terminal sliding mode control evolved out of seminal work on terminal attractors done by Zak in the JPL, and is evoked by the concept of terminal attractors which guarantee finite time convergence of the states. While, in normal sliding mode, asymptotic stability is promised which leads to the convergence of the states to the origin.
But this convergence may only be guaranteed within infinite time. In TSM, a nonlinear term is introduced in the sliding surface design so that the manifold is formulated as an attractor. After the sliding surface is intercepted, the trajectory is attracted within the manifold and converges to the origin following a power rule.
Terminal sliding mode also has been widely applied to nonlinear process control, for example, rigid robot control etc.. Several open questions still remain on the mathematical treatment of the system's behavior at the origin since it is non-Lipschitz.
==Control Scheme==
Consider a continuous nonlinear system in canonical form
\overset_(t) =x_(t) ......
\overset_(t) =x_(t)
\overset_(t)=a(x)+b(x)u(t)
where x(t)\in R^ is the state vector, u\in R is the control
input, a(x) and b(x) are nonlinear functions in x(t).
Then a sequence of terminal sliding surfaces can be designed as follows:
s_(t) =\overset_(t)+\alpha _(t)s_^(t) =\overset_(t)+\alpha _(t)s_^(t) =\overset_(t)+\alpha _(t)s_^(t)=x_(t) and \gamma _=\frac}, i=1,2,...,n-1 . p_, q_ are positive odd numbers and p_\leq q_.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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