Systems with strong damping and their spectra

Jacob, Birgit; Tretter, Christiane; Trunk, Carsten; Vogt, Hendrik (2018). Systems with strong damping and their spectra. Mathematical methods in the applied sciences, 41(16), pp. 6546-6573. Wiley 10.1002/mma.5166

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We establish a new method for obtaining nonconvex spectral enclosures for operators associated with second‐order differential equations ż:(t) + Dż(t) + A₀z(t) = 0 in a Hilbert space. In particular, we succeed in establishing the existence of a spectral gap, which is the first result of this kind since the seminal results of Krein and Langer for oscillations of damped systems. While the latter and other spectral bounds are confined to dampings D that are symmetric and dominated by A0, we allow for accretive D of equal strength as A₀. To achieve these results, we prove new abstract spectral inclusion results that are much more powerful than classical numerical range bounds. Two different applications, small transverse oscillations of a horizontal pipe carrying a steady‐state flow of an ideal incompressible fluid and wave equations with strong (viscoelastic and frictional) damping, illustrate that our new bounds are explicit.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Department of Mathematics and Statistics > Institute of Mathematics

UniBE Contributor:

Tretter, Christiane

Subjects:

500 Science > 510 Mathematics

ISSN:

0170-4214

Publisher:

Wiley

Language:

English

Submitter:

Olivier Bernard Mila

Date Deposited:

16 May 2019 16:04

Last Modified:

24 Oct 2019 15:30

Publisher DOI:

10.1002/mma.5166

BORIS DOI:

10.7892/boris.126062

URI:

https://boris.unibe.ch/id/eprint/126062

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