Wyniki wyszukiwania dla: SUBHARMONICS

• Subharmonic solutions for a class of Lagrangian systems

  Publikacja

  • A. Bahrouni
  • M. Izydorek
  • J. Janczewska

  - Discrete and Continuous Dynamical Systems-Series S - Rok 2019

  We prove that second order Hamiltonian systems with a potential of class C1, periodic in time and superquadratic at infinity with respect to the space variable have subharmonic solutions. Our intention is to generalise a result on subharmonics for Hamiltonian systems with a potential satisfying the global Ambrosetti-Rabinowitz condition from [P. H. Rabinowitz, Proc. Roy. Soc. Edinburgh Sect. A, 114 (1990), 33-38]. Indeed, we weaken...

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• A Strategy to Locate Fixed Points and Global Perturbations of ODE’s: Mixing Topology with Metric Conditions

  Publikacja

  • G. Graff
  • A. Ruiz-Herrera

  - Journal of Dynamics and Differential Equations - Rok 2013

  In this paper we discuss a topological treatment for the planar system z' = f (t, z) + g(t, z) where f and g are T -periodic in time and g(t, z) is bounded. Namely, we study the effect of g(t, z) in two different frameworks: isochronous centers and time periodic systems having subharmonics. The main tool employed in the proofs consists of a topological strategy to locate fixed points in the class of orientation preserving embedding...

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• Synchronized six-step voltage generation in high-speed PMSM drive

  Publikacja

  • L. Jarzębowicz
  • M. Cisek

  - Rok 2019

  Synchronized voltage generation has already been considered in the context of pulse width modulation (PWM). References prove that synchronized PWM substantially decreases subharmonics in inverter output voltage when operating with low switching-to-fundamental frequency ratio. This paper identifies problems of unsynchronized voltage generation in electric drives under six-step inverter operation. Guidelines for the synchronization...

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