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This paper addresses the problem of observer-based fault detection for networked control systems (NCSs) with uncertain time-delays and data packet dropouts. The uncertain time-varying delays and packet dropouts of NCSs are modeled as parameter uncertainties of the NCSs and a stochastic variable satisfying Bernoulli distribution, respectively. Combining with the delta operator theory, a new discrete...
Reliability of a navigation system is one of greatimportance for navigation purposes. Therefore, anintegrity monitoring system is an inseparable part of aviation navigation system. Failures or faults due to malfunctions in the systems should be detected and repaired to keep the integrity of the system intact. In this paper, we present a method based on wavelet analysis for detecting failures. The...
This paper investigates sensor fault problems in time-delay systems with uncertain disturbances. Using the measurement equation, the sensor fault can be translated into the state inputs. Subsequently, a cluster of residual generators is designed by employing the space geometric method. The corresponding filter parameters are obtained based on the space geometric approach, then using H∞ optimization...
In this study, an application of genetic algorithm optimization-based fault detection for an induction motor with actuator faults is addressed. The frequencies of the modelling errors are identified from the Fourier transform of the measurement outputs, and a multi-objective cost function is constructed for minimizing the effects from the dominant modelling errors components while maximizing the influences...
Sensor selection and optimization (SSO) plays an important role in the design of fault diagnosis system. In this paper, we propose a modeling method considering detecting performance of sensor. Firstly, the system model which applies structural analysis theory on the analytical redundancy relations (ARRs) and faults of the system is introduced. Then a new performance metric for the sensor suite based...
By comparing the test verification method, the testability virtual verification technique based on Modelica is proposed. This paper designs the model architecture of testability virtual verification, completes implementations of the testability virtual verification and develops a software about testability virtual verification based on OpenModelica. And through a system instance, practicality and...
This paper presents a simple and reliable method for detecting the faults occurring in a permanent magnet synchronous generator (PMSG) connected with a three-phase uncontrolled rectifier bridge (TPURB), which is based on monitoring the output DC current. A PMSG connected with a TPURB at constant speed is discussed under two types of faults, namely phase winding faults and diode faults. An adaptive...
In order to increase the reliability which is important for marine energy exploitation, five-phase PMSG diode rectifier drive is investigated in this paper. Nevertheless, the use of diode rectifier increases the difficulty of the analysis of drive's behavior, as it introduces uncertainty of harmonic components. Especially in fault mode, this irregularity greatly affects the fault detection. Harmonic...
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