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:''See [[Lyapunov stability]], which gives a definition of '''asymptotic stability''' for more general [[dynamical systems]]. All '''exponentially stable''' systems are also '''asymptotically stable.'''''
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In [[control theory]], a continuous [[LTI system theory|linear time-invariant system]] is '''exponentially stable''' if and only if the system has [[eigenvalue]]s (i.e., the [[pole (complex analysis)|pole]]s of input-to-output systems) with strictly negative real parts. (i.e., in the left half of the [[complex plane]]).<ref>David N. Cheban (2004), ''Global Attractors Of Non-autonomous Dissipative Dynamical Systems''. p.&nbsp;47</ref> A discrete-time input-to-output LTI system is exponentially stable if and only if the poles of its [[transfer function]] lie strictly within the [[unit circle]] centered on the origin of the complex plane. Exponential stability is a form of [[asymptotic stability]]. Systems that are not LTI are exponentially stable if their convergence is [[bounded function|bounded]] by [[exponential growth|exponential decay]].


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An exponentially stable LTI system is one that will not "blow up" (i.e., give an unbounded output) when given a finite input or non-zero initial condition. Moreover, if the system is given a fixed, finite input (i.e., a [[Heaviside step function|step]]), then any resulting oscillations in the output will decay at an [[exponential growth|exponential rate]], and the output will tend [[asymptote|asymptotically]] to a new final, steady-state value. If the system is instead given a [[Dirac delta function|Dirac delta impulse]] as input, then induced oscillations will die away and the system will return to its previous value. If oscillations do not die away, or the system does not return to its original output when an impulse is applied, the system is instead [[marginal stability|marginally stable]].
 
==Example exponentially stable LTI systems==
 
[[Image:AsymptoticStabilityImpulseScilab.png|thumb|320px|The impulse responses of two exponentially stable systems]]
 
The graph on the right shows the [[impulse response]] of two similar systems. The green curve is the response of the system with impulse response <math>y(t) = e^{-\frac{t}{5}}</math>, while the blue represents the system <math>y(t) = e^{-\frac{t}{5}}\sin(t)</math>. Although one response is oscillatory, both return to the original value of 0 over time.
 
===Real-world example===
 
Imagine putting a marble in a ladle. It will settle itself into the lowest point of the ladle and, unless disturbed, will stay there. Now imagine giving the ball a push, which is an approximation to a Dirac [[Dirac delta function|delta impulse]]. The marble will roll back and forth but eventually resettle in the bottom of the ladle. Drawing the horizontal position of the marble over time would give a gradually diminishing sinusoid rather like the blue curve in the image above.
 
A step input in this case requires supporting the marble away from the bottom of the ladle, so that it cannot roll back. It will stay in the same position and will not, as would be the case if the system were only marginally stable or entirely unstable, continue to move away from the bottom of the ladle under this constant force equal to its weight.
 
It is important to note that in this example the system is not stable for all inputs. Give the marble a big enough push, and it will fall out of the ladle and fall, stopping only when it reaches the floor. For some systems, therefore, it is proper to state that a system is exponentially stable ''over a certain range of inputs''.
 
==See also==
* [[Control theory]]
* [[State space (controls)]]
 
==References==
{{reflist}}
 
==External links==
* [http://www.princeton.edu/~ap/stability.pdf. Parameter estimation and asymptotic stability instochastic filtering], Anastasia Papavasiliou∗September 28, 2004
 
 
[[Category:Dynamical systems]]
[[Category:Stability theory]]
 
[[fr:Stabilité de Lyapunov#Les stabilités]]

Latest revision as of 00:41, 13 December 2014

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