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Download e-book for iPad: Applications of Liapunov Methods in Stability by A. Halanay, V. Rasvan

By A. Halanay, V. Rasvan

ISBN-10: 9401046972

ISBN-13: 9789401046978

ISBN-10: 9401116008

ISBN-13: 9789401116008

The 12 months 1992 marks the centennial anniversary of book of the distinguished monograph "The basic challenge of balance of movement" written through A. M. Liapunov. This anniversary evokes to contemplate the way in which conception and functions have constructed in this century. the 1st statement you will make is that the so-called "second method", these days referred to as the "Liapunov functionality method", has obtained extra awareness than the "first method"; allow us to additionally point out the learn of severe circumstances, which introduced extra realization lately in reference to the learn of bifurcations and with nonlinear stabilization. one of many purposes of recognition of the Liapunov functionality strategy can be the truth that, in lots of events in technological know-how and engineering, and never purely in mechanics, which used to be the most resource of notion for the paintings of Liapunov, average Liapunov capabilities could be proposed, in detail hooked up with the homes of the techniques. it's one of many reasons of this booklet to recommend this concept. From the mathematical standpoint, the century after the 1st seem­ ance of Liapunov's monograph has been characterised either via basic­ izations and through refinements of Liapunov's principles. yet we suppose that the main staggering growth is the knowledge of the broad probabilities open for purposes via balance conception as built through Liapunov a century in the past. we've attempted to teach the various rules during this course by way of commence­ ing with our own event within the research of a few models.

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4 Liapunov Functions in Hydraulic Engineering 53 We see directly that we can take Bf = II(Qi - ~t) i#k Appendix E Consider now the system n-l L.

N - 1 . We have already discussed the system for Xle. and we have deduced that Xle. are constant if y is constant. Since Xle. are constant they also satisfy also hence Therefore A direct computation shows 44 Some General Results in Stability Theory = Qo(H + 3Zo) 2Zo(H + Zo) # O. = = = We deduce that y 0 hence Xk 0, k 1, ... , n and the proof is completed. 3. Finally, we describe another application to a scheme with two tunnels feeding one surge tank and with one intermediary intake shaft on each of these tunnels.

1). Let Vet) V(x(t; to, Xo)); we have = AI V (t) d = oV ax (x(t; to, Xo)) dt x(t; to, Xo) = = oV ax (x(t;to,XQ))f(x(t;to,XQ))::; O. Hence t ~ Vet) is decreasing. We deduce that V(t) ::; Veto) for t ~ to. Therefore cx(lx(t;to,XQ)I)::; V(x(t;to,XQ)) = V(t)::; Veto) = = V(IXQI) ::; ~(IXQI) It follows that cx(lx(t;to,Xo)I)::; ~(IXoI)::; ~(cS(e)) = cx(e) hence Ix(t; to, Xo)1 < e for t 2: to and uniform stability is proved. 3 let there exist a con- tinuous, increasing function y, defined on [0,00), yeO) = 0 such that OV .

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Applications of Liapunov Methods in Stability by A. Halanay, V. Rasvan

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