Simultaneous state and parameter estimation based actuator fault detection and diagnosis (FDD) for single-rotor unmanned helicopters (UHs) is investigated in this paper. A literature review of actuator FDD for UHs is given firstly. Based on actuator healthy coefficients (AHCs), which are introduced to represent actuator faults, a combined dynamic model is established with the augmented state co...

The protection of meshed HVDC grids requires the fast identification faults affecting transmission lines. Communication-based methods are thus not suited due to delays. Many approaches involving a model transient behavior faulty line have recently been proposed. Nevertheless, an accurate description traveling wave phenomenon in multi-conductor lines such as overhead complex computations ill-sui...

Condition monitoring of electric drives is of paramount importance since it contributes to enhance the system reliability and availability. Moreover, the knowledge about the fault mode behavior is extremely important in order to improve system protection and fault-tolerant control. Fault detection and diagnosis in squirrel cage induction machines based on motor current signature analysis (MCSA)...

We pose a multi-model system parameter estimation problem. A multi-model system is a linearly parameterized system H(z, p) = ∑np i=1 piHi(z). The parameter estimation problem is: given the set of systems {Hi(z)} np i=1, describing the multi-model system, find a causal system that assumes as an input the input/output signals of the multi-model system and produces as an output the parameter estim...

Abstract—In this paper, the problem of fault detection and isolation in the attitude control subsystem of spacecraft formation flying is considered. In order to design the fault detection method, an extended Kalman filter is utilized which is a nonlinear stochastic state estimation method. Three fault detection architectures, namely, centralized, decentralized, and semi-decentralized are design...

In this paper, we will present an analysis on the fault erasure BP decoders based on the density evolution. In the fault BP decoder, messages exchanged in a BP process are stochastically corrupted due to unreliable logic gates and flip-flops; i.e., we assume circuit components with transient faults. We derived a set of the density evolution equations for the fault erasure BP processes. Our dens...

Abstract Fault damage zones have a higher upscaled permeability than the host rock because of fracture intensity therein. Fracture distribution in zone depends highly on geometry fault segments. However, precise images architectural elements large-scale faults at depth are difficult to obtain by seismic acquisition and imaging techniques. We present numerical method that generates segments mult...