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Jing Wang,Junde Wang,Meng Zhou 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.11
This paper presents an on-line auxiliary input signal design strategy based on set-membership and moving window techniques to deal with the problem of active fault detection and isolation. The goal of active fault detection and isolation is to design an auxiliary input signal, such that the nominal system output set and faulty systems output sets are separated each other after injecting the input signal. In this paper, the output sets are characterized by ellipsoids. First, an extended model of the system based on moving window technique is constructed, then an auxiliary input signal is calculated on-line based on the equivalent model. As the energy of the auxiliary input signal is restricted minimum to decrease the influence of the signal on the system, the design condition of active fault detection and isolation is transformed into an optimal problem. Furthermore, the fault is isolated by judging the actual system output belongs to which output ellipsoid of the faulty models, or determining the probability of the system output is in which faulty model when the output ellipsoids of faulty models are intersecting. Finally, numerical simulations illustrate the feasibility and effectiveness of the proposed approach.
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Guiqing Chen,Gaosheng Fu,Tianyun Wei,Chaozeng Cheng,Huosheng Wang,Junde Wang 대한금속·재료학회 2018 METALS AND MATERIALS International Vol.24 No.4
The 3003 aluminum alloys with four Different initial grain sizes were deformed by isothermal compression in the range ofdeformation temperature 300–500 °C at strain rate 0.01–10.0 s −1 with Gleeble-1500 thermal simulator. The results showthat the smaller the initial grain size of the alloy, the greater the required deformation resistance, and the smaller the peakstrain, which is conducive to the occurrence of dynamic recrystallization (DRX). The DRX critical strain increases with thedecrease of the deformation temperature or the increase of the strain rate, and the DRX volume fraction increases with thedecrease of the strain rate and the increase of the deformation temperature. The average grain size of 3003 aluminum alloyafter deformation is smaller than that before deformation. The smaller the initial grain size, the lower the critical recrystallizationstrain. So the DRX is carried out more fully, contributing to the thermoplastic deformation of the alloy.
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