Search Results for author: Hector Ramirez

Found 5 papers, 0 papers with code

Infinite-dimensional observers for high order boundary-controlled port-Hamiltonian systems

no code implementations17 May 2023 Jesus-Pablo Toledo-Zucco, Yongxin Wu, Hector Ramirez, Yann Le Gorrec

This letter investigates the design of a class of infinite-dimensional observers for one dimensional (1D) boundary controlled port-Hamiltonian systems (BC-PHS) defined by differential operators of order $N \geq 1$.

Boundary controlled irreversible port-Hamiltonian systems

no code implementations27 Apr 2021 Hector Ramirez, Yann Le Gorrec, Bernhard Maschke

Boundary controlled irreversible port-Hamiltonian systems (BC-IPHS) on 1-dimensional spatial domains are defined by extending the formulation of reversible BC-PHS to irreversible thermodynamic systems controlled at the boundaries of their spatial domains.

Linear Matrix Inequality Design of Exponentially Stabilizing Observer-Based State Feedback Port-Hamiltonian Controllers

no code implementations13 Oct 2020 Jesus Toledo, Hector Ramirez, Yongxin Wu, Yann Le Gorrec

The design of an observer-based state feedback (OBSF) controller with guaranteed passivity properties for port-Hamiltonian systems (PHS) is addressed using linear matrix inequalities (LMIs).

Observer-based boundary control of distributed port-Hamiltonian systems

no code implementations9 Oct 2019 Jesus Toledo, Yongxin Wu, Hector Ramirez, Yann Le Gorrec

The design is based on an early-lumping approach in which a finite-dimensional approximation of the infinite-dimensional system derived by spatial discretization is used to design the observer and the controller.

Primordial power spectrum features in phenomenological descriptions of inflation

no code implementations2 Jun 2016 Stefano Gariazzo, Olga Mena, Hector Ramirez, Lotfi Boubekeur

We extend an alternative, phenomenological approach to inflation by means of an equation of state and a sound speed, both of them functions of the number of $e$-folds and four phenomenological parameters.

Cosmology and Nongalactic Astrophysics

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