The sparse decomposition based on matching pursuit is an adaptive sparse expression method for signals. This paper proposes an idea concerning a composite dictionary multi-atom matching decomposition and reconstruction algorithm, and the introduction of threshold de-noising in the reconstruction algorithm. Based on the structural characteristics of gear fault signals, a composite dictionary com...

VAV system is a very complicated one in airconditionging systems, thus automatic control become the key of such a system. As necessary components in automatic control system, sensor has failure risk. It is so expensive that detect sensor fault by hardware redundancy in comfortable air-conditioning system. This paper presents an approach, Principal Component Analysis (PCA), to detect and identif...

This paper proposes a robust sliding mode observer for a class of linear uncertain systems to generate a reconstruction of faults. The state estimation error of the proposed observer is shown to be uniformly ultimately bounded with respect to a ball whose radius is a function of design parameters. An exact fault reconstruction scheme that is decoupled from the uncertainty is presented. In simul...

The major inconvenient for the fault detection and isolation (FDI) in technical processes based on analytical redundancy is the requirement of a very accurate model of the system. By contrary, in the methods based on data handling it is not required of a precise model, since they are based on the manipulation of the information by means of the measured data. Thus, in this work a set of statisti...

This paper deals with tomographic image reconstruction under the situation where some of projection data bins are contaminated with abnormal data. Such situations occur in various instances of tomography. We propose a new reconstruction algorithm called the Fault-Tolerant reconstruction outlined as follows. The least-squares (Lnorm) error function ‖ A~x−~b ‖2 used in ordinary iterative reconstr...

This paper deals with a current sensor fault reconstruction algorithm for the torque closed-loop drive system of an interior PMSM. First, sensor faults are equated to actuator ones by a new introduced state variable. Then, in αβ coordinates, based on the motor model with active flux linkage, a current observer is constructed with a specific sliding mode equivalent control methodology to elimina...