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- 저자 : Sakellariou, G. (검색결과 2 건)
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John S. Sakellariou,Konstantinos A. Petsounis,Spilios D. Fassois 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.2
The design of a vibration based fault detection and isolation (FDI) unit that can tackle the combined problem of fault detection,isolation (or identification) and magnitude estimation (collectively known as fault diagnosis), in railway vehicle suspensions is presented. The unit is initially “trained” in a baseline phase based on data obtained from a simplified physics-based model of a railway vehiclesuspension. Fault diagnosis is subsequently achieved in an inspection phase through a single, properly preselected, pair of vibrationsignals acquired from the vehicle, and a recently introduced data-based method, referred to as the functional model based method(FMBM), without resorting to the physics-based model of the baseline phase. The method’s cornerstone is the novel class of stochasticARX-type models capable of accurately representing a system in a faulty state for its continuum of fault magnitudes. Fault diagnosisfeasibility in a railway vehicle suspension is demonstrated via Monte Carlo simulations using different types and magnitudes of faults inthe physics-based model and generating vibration signals corresponding to the healthy and faulty suspension. Two vibration signals areused by the diagnosis unit: the track velocity profile and the vehicle body acceleration above the trailing airspring. Fault diagnosis basedon the FMBM is effective in a compact and unified statistical framework accounting for experimental and modelling uncertainty throughappropriate interval estimates and hypothesis testing procedures. The unit is shown to exhibit high sensitivity and accurate estimation ofeven very small fault magnitudes, to detect and isolate unknown faults for which it has not been trained, and to be robust to highmeasurement noise, car body mass variations, and varying track irregularity.
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Synthesis and Linear Viscoelasticity of Polystyrene Stars with a Polyketone Core
Polgar, L. M.,Lentzakis, H.,Collias, D.,Snijkers, F.,Lee, S.,Chang, T.,Sakellariou, G.,Wever, D. A. Z.,Toncelli, C.,Broekhuis, A. A.,Picchioni, F.,Gotsis, A. D.,Vlassopoulos, D. American Chemical Society 2015 Macromolecules Vol.48 No.18
<P>We report on a novel synthetic route to synthesize relatively large quantities of polystyrene (PS) star polymers with targeted arm functionality and molar mass and their rheological properties in the molten state. The synthetic route involves grafting styrene monomers onto a modified (aliphatic, alternating) polyketone backbone with a specific number of initiating grafting sites using controlled atom transfer radical polymerization (ATRP). Several polyketone precursors were used. This resulted in a large array of star polystyrenes with nonspherical cores and varying average arm length and number of arms. Their linear viscoelasticity was investigated and discussed in the context of the known response of anionically synthesized stars. Using a powerful characterization toolbox, including state-of-the-art interaction chromatography, rheometry, and tube modeling via the branch-on-branch (BoB) algorithm, we have assessed the viscoelasticity of these star polymers quantitatively. In particular, we have demonstrated a variability in molecular structure, which differs substantially from their anionically synthesized counterparts. Hence, whereas this new family of star polymers is not recommended for fundamental studies of polymer physics such as the molecular origin of relaxation mechanisms without prior extensive fractionation, they could be used in studies of mixtures as well as industrially relevant processing operations that require large amounts of polymeric stars.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/mamobx/2015/mamobx.2015.48.issue-18/acs.macromol.5b01434/production/images/medium/ma-2015-01434h_0012.gif'></P>
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