This paper proposes a technique to estimate the angular velocity of a rigid body from vector measurements. Compared to the approaches presented in the literature, it does not use attitude information nor rate gyros as inputs. Instead, vector measurements are directly filtered through a nonlinear observer estimating the angular velocity. Convergence is established using a detailed analysis of th...

In this paper, we deal with the genericity of the observability property and the existence of asymptotic observers for nonlinear systems. In the case where the number of outputs is larger than the number of inputs and the state space is compact, we prove that observability in a very strong sense (more or less, observability for each sufficiently differentiable input) is generic. This is obtaine...

This paper considers output-feedback control of nonlinear discrete-time systems using a nonlinear statefeedback controller combined with a nonlinear observer. Under suitable assumptions, either asymptotic stability or exponential stability of the closed-loop system are established. These results have a general validity and are essential in many advanced nonlinear control techniques, such as mod...

This paper investigates the fault detection of a micro parallel plate capacitor subjected to nonlinear electrostatic force. For this end Thau observer, which has good ability in fault detection of nonlinear system has been presented and governing nonlinear dynamic equation of the capacitor has been presented. Upper and lower threshold for fault detection have been obtained. The robustness of th...

This letter investigates the design of a class infinite-dimensional observers for one dimensional (1D) boundary controlled port-Hamiltonian systems (BC-PHS) defined by differential operators order N≥1. The convergence proposed observer depends on number and location available measurements. Asymptotic is assured N≥1, provided that enough measurements are available, exponential can be cases N=1 N...

A flux observer for induction motors which is adaptive to the active rotor resistance variations presented. Due added fluxes overestimation in structure, global exponential stability properties of current and vector components estimation are ensured under conditions persistency excitation. The proposed has a simpler structure compared existing solutions with properties. simulation results dynam...

The distributed estimation problem is solved for continuous-time observer nodes that obtain real-time measurements but communicate with their neighbors over a communication network. To this end, the digital between modeled by time-delay approach where variable sampling intervals, transmission delays, and packet dropouts are taken into account. An LMI design of gains derived using Halanay's ineq...

results inter-observer agreement of the pathology scores based on nas scoring system was acceptable for steatosis, lobular inflammation, and fibrosis, but not for hepatocyte ballooning. the intra-observer agreement was acceptable in all scales, with lowest intra-class correlation observed for lobular inflammation. materials and methods the anonymous liver biopsy samples of 100 consecutive nafld...

We provide new reduced order observer designs for a key class of nonlinear dynamics. When continuous output measurements are available, we prove that our observers converge in fixed finite time the absence perturbations, and robustness result under uncertainties dynamics, which bounds observation error terms on uncertainties. The contain dynamic extension with only one pointwise delay, they use...