89 citations · 264 across the 15 of their papers we have counts for
16 papers
Designing controllers with predefined convergence-time bound using bounded time-varying gains
Rodrigo Aldana-López, Richard Seeber, Hernan Haimovich +1
Recently, there has been a great deal of attention in a class of controllers based on time-varying gains, called prescribed-time controllers, that steer the system's state to the o…
Worst-case error bounds for the super-twisting differentiator in presence of measurement noise
Richard Seeber
The super-twisting differentiator, also known as the first-order robust exact differentiator, is a well known sliding mode differentiator. In the absence of measurement noise, it a…
Generalized Filippov solutions for systems with prescribed-time convergence
Richard Seeber
Dynamical systems with prescribed-time convergence sometimes feature a right-hand side exhibiting a singularity at the prescribed convergence time instant. In an open neighborhood…
Implementing prescribed-time convergent control: sampling and robustness
Hernan Haimovich, Rodrigo Aldana-Lopez, Richard Seeber +1
According to recent results, convergence in a prespecified or prescribed finite time can be achieved under extreme model uncertainty if control is applied continuously over time. T…
On inherent limitations in robustness and performance for a class of prescribed-time algorithms
Rodrigo Aldana-López, Richard Seeber, Hernan Haimovich +1
Prescribed-time algorithms based on time-varying gains may have remarkable properties, such as regulation in a user-prescribed finite time that is the same for every nonzero initia…
Unknown Input Observer Design for Linear Time-Invariant Systems -- A Unifying Framework
Markus Tranninger, Helmut Niederwieser, Richard Seeber +1
This paper presents a new observer design approach for linear time invariant multivariable systems subject to unknown inputs. The design is based on a transformation to the so-call…
Integral state-feedback control of linear time-varying systems: A performance preserving approach
Richard Seeber, Markus Tranninger
An integral extension of state-feedback controllers for linear time-varying plants is proposed, which preserves performance of the nominal controller in the unperturbed case. Simil…
Optimal Robust Exact Differentiation via Linear Adaptive Techniques
Richard Seeber, Hernan Haimovich
The problem of differentiating a function with bounded second derivative in the presence of bounded measurement noise is considered in both continuous-time and sampled-data setting…
Higher-order sliding mode observer design for linear time-invariant multivariable systems based on a new observer normal form
Helmut Niederwieser, Markus Tranninger, Richard Seeber +1
In various applications in the field of control engineering the estimation of the state variables of dynamic systems in the presence of unknown inputs plays an important role. Exis…
Differentiator for Noisy Sampled Signals with Best Worst-Case Accuracy
Hernan Haimovich, Richard Seeber, Rodrigo Aldana-López +1
This paper proposes a differentiator for sampled signals with bounded noise and bounded second derivative. It is based on a linear program derived from the available sample informa…
Detectability Conditions and State Estimation for Linear Time-Varying and Nonlinear Systems
Markus Tranninger, Richard Seeber, Martin Steinberger +2
This work proposes a detectability condition for linear time-varying systems based on the exponential dichotomy spectrum. The condition guarantees the existence of an observer, who…
Designing predefined-time differentiators with bounded time-varying gains
Rodrigo Aldana-López, Richard Seeber, David Gómez-Gutiérrez +2
There is an increasing interest in designing differentiators, which converge exactly before a prespecified time regardless of the initial conditions, i.e., which are fixed-time con…
An arbitrary-order predefined-time exact differentiator for signals with exponential growth bound
David Gómez-Gutiérrez, Rodrigo Aldana-López, Richard Seeber +2
There is a growing interest in differentiation algorithms that converge in fixed time with a predefined Upper Bound on the Settling Time (UBST). However, existing differentiation a…
Strong Detectability and Observers for Linear Time Varying Systems
Markus Tranninger, Richard Seeber, Juan G. Rueda-Escobedo +1
This work presents a notion of strong detectability for linear time varying systems affected by unknown inputs. It is shown that this notion is equivalent to detectability of an au…
Robust exact differentiators with predefined convergence time
Richard Seeber, Hernan Haimovich, Martin Horn +2
The problem of exactly differentiating a signal with bounded second derivative is considered. A class of differentiators is proposed, which converge to the derivative of such a sig…
Uniform Detectability of Linear Time Varying Systems with Exponential Dichotomy
Markus Tranninger, Richard Seeber, Martin Steinberger +1
Exponential dichotomies play a central role in stability theory for dynamical systems. They allow to split the state space into two subspaces, where all trajectories in one subspac…