Nonconservative Stability Problems of Modern Physics by Oleg N. Kirillov

By Oleg N. Kirillov

This paintings supplies a whole evaluate with reference to nonconservative balance from the fashionable perspective. proper mathematical recommendations are offered, in addition to rigorous balance effects and various classical and modern examples from mechanics and physics. The e-book shall serve to offer and potential experts delivering the present kingdom of data during this actively constructing box. the certainty of this idea is essential for plenty of components of expertise, as dissipative results in rotor dynamics orcelestial mechanics

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E. it is indefinite with the eigenvalues 1,2 D ˙ku0 k2 . 48) determines the frequency and the growth rate of the perturbed modulation [90] p ˛ 2 2 2˛ ku0 k2 . 47) formally coincides with that of the Jeffcott rotor and therefore its eigenvalues are pure imaginary: D ˙i ˛ . ˙ 2k/. k/ exhibit crossings at diabolical points [270] where double semisimple eigenvalues originate, cf. 3 (b). e. 18 At small amplitudes of the modulation, the eigenvalues are pure imaginary. With an increase in the amplitude, the modes with the opposite Krein signature collide at the threshold ku0 k D ku0 ki , where [90, 610] ku0 k2i D ˛ 2 .

0, the stability boundary tends to a limiting curve that is below the undamped q ˛ threshold for all > 0 and thus does not coincide with the line ku0 k D 2 . 52). 10 (d) such limiting curves are plotted for ˇ D 5, 50, 500 and for ˇ ! 1 and are visible as the boundaries between the gray areas of different darkness. In the case ˇ ! 52) yields [305] r r ˛ 2 ˛ 2 2 /, ku0 k D ˙ k 2 /. k . 10 (d). Note, however, that the modulational instability is characterized by < k [90]. 3 Brouwer’s problem with damping and circulatory forces Enhancement of the modulational instability with dissipation is a manifestation of one of the most fundamental phenomena that characterize nonconservative systems – the effect of dissipation-induced instabilities [74, 312, 333].

18 Chapter 1 Introduction In the RF-electric-quadrupole Paul trap16 invented in 1953 [471], a saddle-shaped field created to trap a charged ion is not rotating about the ion in the center. The Paul-trap potential can only ‘flap’ the field up and down, which yields two decoupled Mathieu equations describing the motion of a single ion in the trap. Nevertheless, comparing the rotating saddle trap and the Paul trap, Shapiro [522] and Thompson et al. [571] demonstrated that the former mimics most of the characteristics of the Paul trap, such as regions of stability and instability, micromotion and secular oscillation frequency [571].

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