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Book
Nonconservative stability problems of modern physics
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ISBN: 3110270439 9783110270433 9783110270341 311027034X Year: 2013 Volume: 14 Publisher: Berlin ; Boston : Walter de Gruyter GmbH & Co., KG,

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Abstract

This work gives a complete overview on the subject of nonconservative stability from the modern point of view. Relevant mathematical concepts are presented, as well as rigorous stability results and numerous classical and contemporary examples from mechanics and physics. It deals with both finite- and infinite-dimensional nonconservative systems and covers the fundamentals of the theory, including such topics as Lyapunov stability and linear stability analysis, Hamiltonian and gyroscopic systems, reversible and circulatory systems, influence of structure of forces on stability, and dissipation-induced instabilities, as well as concrete physical problems, including perturbative techniques for nonself-adjoint boundary eigenvalue problems, theory of the destabilization paradox due to small damping in continuous circulatory systems, Krein-space related perturbation theory for the MHD kinematic mean field α²-dynamo, analysis of Campbell diagrams and friction-induced flutter in gyroscopic continua, non-Hermitian perturbation of Hermitian matrices with applications to optics, and magnetorotational instability and the Velikhov-Chandrasekhar paradox. The book serves present and prospective specialists providing the current state of knowledge in the actively developing field of nonconservative stability theory. Its understanding is vital for many areas of technology, ranging from such traditional ones as rotor dynamics, aeroelasticity and structural mechanics to modern problems of hydro- and magnetohydrodynamics and celestial mechanics.


Book
Instability, Index Theorem, and Exponential Trichotomy for Linear Hamiltonian PDEs.
Authors: ---
ISBN: 1470470136 Year: 2022 Publisher: Providence : American Mathematical Society,

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"Consider a general linear Hamiltonian system tu JLu in a Hilbert space . We assume that L induces a bounded and symmetric bi-linear form L, on , which has only finitely many negative dimensions n (L). There is no restriction on the anti-self-dual operator J D(J) . We first obtain a structural decomposition of into the direct sum of several closed subspaces so that L is blockwise diagonalized and JL is of upper triangular form, where the blocks are easier to handle. Based on this structure, we first prove the linear exponential trichotomy of etJL. In particular, etJL has at most algebraic growth in the finite co-dimensional center subspace. Next we prove an instability index theorem to relate n (L) and the dimensions of generalized eigenspaces of eigenvalues of JL, some of which may be embedded in the continuous spectrum. This generalizes and refines previous results, where mostly J was assumed to have a bounded inverse. More explicit information for the indexes with pure imaginary eigenvalues are obtained as well. Moreover, when Hamiltonian perturbations are considered, we give a sharp condition for the structural instability regarding the generation of unstable spectrum from the imaginary axis. Finally, we discuss Hamiltonian PDEs including dispersive long wave models (BBM, KDV and good Boussinesq equations), 2D Euler equation for ideal fluids, and 2D nonlinear Schrodinger equations with nonzero conditions at infinity, where our general theory applies to yield stability or instability of some coherent states"--

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