Advanced search options

Advanced Search Options 🞨

Browse by author name (“Author name starts with…”).

Find ETDs with:

in
/  
in
/  
in
/  
in

Written in Published in Earliest date Latest date

Sorted by

Results per page:

Sorted by: relevance · author · university · date | New search

You searched for subject:(widely separated frequencies). Showing records 1 – 2 of 2 total matches.

Search Limiters

Last 2 Years | English Only

No search limiters apply to these results.

▼ Search Limiters


Universiteit Utrecht

1. Tuwankotta, J.M. Higher-Order Resonances in Dynamical Systems.

Degree: 2002, Universiteit Utrecht

This thesis is a collection of studies on higher-order resonances in an important class of dynamical systems called coupled oscillators systems. After giving an overview of the mathematical background, we start in Chapter 1 by presenting a study on resonances in two degrees of freedom, autonomous, Hamiltonian systems. Due to the presence of a symmetry condition on one of the degrees of freedom, we show that some of the resonances vanish as lower order resonances. After giving a sharp estimate of the resonance domain, we investigate this order change of resonance in a rather general potential problem with discrete symmetry and consider as an example the H´enon-Heiles family of Hamiltonians. We also study a classical example of a mechanical system with symmetry, the elastic pendulum, which leads to a natural hierarchy of resonances with the 4 : 1-resonance as the most prominent after the 2 : 1-resonance and which explains why the 3 : 1- resonance is neglected. In chapter 2 of this thesis we study the performance of a symplectic numerical integrator based on the splitting method. This method is applied to a subtle problem i.e. higher order resonance of the elastic pendulum. In order to numerically study the phase space of the elastic pendulum at higher order resonance, a numerical integrator which preserves qualitative features after long integration times is needed. We show by means of an example that our symplectic method offers a relatively cheap and accurate numerical integrator. In chapter 3 we study two degree of freedom Hamiltonian systems and applications to nonlinear wave equations. Near the origin, we assume that near the linearized system has purely imaginary eigenvalues: ±i[omega]1 and ±i[omega]2 with 0 <[omega]2/[omega]1«1 or w2/w1»1, which is interpreted as a perturbation of a problem with double zero eigenvalues. Using the averaging method, we compute the normal form and show that the dynamics differs from the usual one for Hamiltonian systems at higher order resonances. Under certain conditions, the normal form is degenerate which forces us to normalize to higher degree. The asymptotic character of the normal form and the corresponding invariant tori is validated using KAM theorem. This analysis is then applied to widely separated mode-interaction in a family of nonlinear wave equations containing various degeneracies. In chapter 4 we present an analysis of a system of coupled-oscillators. We make two assumptions for our system. The first assumption is that the frequencies of the characteristic oscillations are widely separated, and the second is that the nonlinear part of the vector field preserves the distance to the origin. Using the first assumption, we prove that the reduced normal form of our system, exhibits an invariant manifold which, exists for all values of the parameters and cannot be perturbed away by including higher order terms in the normal form. Using the second assumption, we view the normal form as an energy-preserving three-dimensional system which is linearly perturbed.…

Subjects/Keywords: Wiskunde en Informatica; Hamiltonian mechanics; higher-order resonance; normal forms; symmetry; elastic pendulum; symplectic numerical integration; widely separated frequencies; singular perturbation; bifurcation; coupled oscillators

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Tuwankotta, J. M. (2002). Higher-Order Resonances in Dynamical Systems. (Doctoral Dissertation). Universiteit Utrecht. Retrieved from http://dspace.library.uu.nl:8080/handle/1874/877

Chicago Manual of Style (16th Edition):

Tuwankotta, J M. “Higher-Order Resonances in Dynamical Systems.” 2002. Doctoral Dissertation, Universiteit Utrecht. Accessed November 25, 2020. http://dspace.library.uu.nl:8080/handle/1874/877.

MLA Handbook (7th Edition):

Tuwankotta, J M. “Higher-Order Resonances in Dynamical Systems.” 2002. Web. 25 Nov 2020.

Vancouver:

Tuwankotta JM. Higher-Order Resonances in Dynamical Systems. [Internet] [Doctoral dissertation]. Universiteit Utrecht; 2002. [cited 2020 Nov 25]. Available from: http://dspace.library.uu.nl:8080/handle/1874/877.

Council of Science Editors:

Tuwankotta JM. Higher-Order Resonances in Dynamical Systems. [Doctoral Dissertation]. Universiteit Utrecht; 2002. Available from: http://dspace.library.uu.nl:8080/handle/1874/877

2. Tuwankotta, J.M. Higher-Order Resonances in Dynamical Systems.

Degree: 2002, University Utrecht

This thesis is a collection of studies on higher-order resonances in an important class of dynamical systems called coupled oscillators systems. After giving an overview of the mathematical background, we start in Chapter 1 by presenting a study on resonances in two degrees of freedom, autonomous, Hamiltonian systems. Due to the presence of a symmetry condition on one of the degrees of freedom, we show that some of the resonances vanish as lower order resonances. After giving a sharp estimate of the resonance domain, we investigate this order change of resonance in a rather general potential problem with discrete symmetry and consider as an example the H´enon-Heiles family of Hamiltonians. We also study a classical example of a mechanical system with symmetry, the elastic pendulum, which leads to a natural hierarchy of resonances with the 4 : 1-resonance as the most prominent after the 2 : 1-resonance and which explains why the 3 : 1- resonance is neglected. In chapter 2 of this thesis we study the performance of a symplectic numerical integrator based on the splitting method. This method is applied to a subtle problem i.e. higher order resonance of the elastic pendulum. In order to numerically study the phase space of the elastic pendulum at higher order resonance, a numerical integrator which preserves qualitative features after long integration times is needed. We show by means of an example that our symplectic method offers a relatively cheap and accurate numerical integrator. In chapter 3 we study two degree of freedom Hamiltonian systems and applications to nonlinear wave equations. Near the origin, we assume that near the linearized system has purely imaginary eigenvalues: ±i[omega]1 and ±i[omega]2 with 0 <[omega]2/[omega]1«1 or w2/w1»1, which is interpreted as a perturbation of a problem with double zero eigenvalues. Using the averaging method, we compute the normal form and show that the dynamics differs from the usual one for Hamiltonian systems at higher order resonances. Under certain conditions, the normal form is degenerate which forces us to normalize to higher degree. The asymptotic character of the normal form and the corresponding invariant tori is validated using KAM theorem. This analysis is then applied to widely separated mode-interaction in a family of nonlinear wave equations containing various degeneracies. In chapter 4 we present an analysis of a system of coupled-oscillators. We make two assumptions for our system. The first assumption is that the frequencies of the characteristic oscillations are widely separated, and the second is that the nonlinear part of the vector field preserves the distance to the origin. Using the first assumption, we prove that the reduced normal form of our system, exhibits an invariant manifold which, exists for all values of the parameters and cannot be perturbed away by including higher order terms in the normal form. Using the second assumption, we view the normal form as an energy-preserving three-dimensional system which is linearly perturbed.…

Subjects/Keywords: Hamiltonian mechanics; higher-order resonance; normal forms; symmetry; elastic pendulum; symplectic numerical integration; widely separated frequencies; singular perturbation; bifurcation; coupled oscillators

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Tuwankotta, J. M. (2002). Higher-Order Resonances in Dynamical Systems. (Doctoral Dissertation). University Utrecht. Retrieved from https://dspace.library.uu.nl/handle/1874/877 ; URN:NBN:NL:UI:10-1874-877 ; URN:NBN:NL:UI:10-1874-877 ; https://dspace.library.uu.nl/handle/1874/877

Chicago Manual of Style (16th Edition):

Tuwankotta, J M. “Higher-Order Resonances in Dynamical Systems.” 2002. Doctoral Dissertation, University Utrecht. Accessed November 25, 2020. https://dspace.library.uu.nl/handle/1874/877 ; URN:NBN:NL:UI:10-1874-877 ; URN:NBN:NL:UI:10-1874-877 ; https://dspace.library.uu.nl/handle/1874/877.

MLA Handbook (7th Edition):

Tuwankotta, J M. “Higher-Order Resonances in Dynamical Systems.” 2002. Web. 25 Nov 2020.

Vancouver:

Tuwankotta JM. Higher-Order Resonances in Dynamical Systems. [Internet] [Doctoral dissertation]. University Utrecht; 2002. [cited 2020 Nov 25]. Available from: https://dspace.library.uu.nl/handle/1874/877 ; URN:NBN:NL:UI:10-1874-877 ; URN:NBN:NL:UI:10-1874-877 ; https://dspace.library.uu.nl/handle/1874/877.

Council of Science Editors:

Tuwankotta JM. Higher-Order Resonances in Dynamical Systems. [Doctoral Dissertation]. University Utrecht; 2002. Available from: https://dspace.library.uu.nl/handle/1874/877 ; URN:NBN:NL:UI:10-1874-877 ; URN:NBN:NL:UI:10-1874-877 ; https://dspace.library.uu.nl/handle/1874/877

.