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Testing and modelling of transient adhesion phenomena in rolling-sliding contacts

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Friction 2024年第5期12卷 1016-1027页

作者： Daniel KVARDA Alexander MEIERHOFER Klaus SIX Faculty of Mechanical Engineering Brno University of TechnologyBrno61669Czech Republic Virtual Vehicle Research gmbh Graz8010Austria

Transient adhesion effects in rolling–sliding contacts influence all aspects of train–track *** is of high importance specifically when these effects result in critically low adhesion,which poses a risk to traction and braking of railway *** study presents a model that can replicate the transient changes of the coefficient of adhesion with tested water and solid particle *** experimental data for the model are measured using a commercial ball-on-disc *** experimental results showed a liquid reservoir in front of the contact area that slowly reduces in *** observation was used in the modelling approach to divide the calculation into two stages where the reservoir is present and when it *** model was able to reproduce the occurrence of low adhesion region seen in experimental results with different particle concentrations.

关键词： coefficient of adhesion tribology transient effects wheel-rail contact

Coupling sensor observation services and web processing services for online geoprocessing in water dam monitoring

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International Journal of Digital Earth 2018年第1期11卷 64-78页

作者： C.Stasch B.Pross B.Gräler C.Malewski C.Förster S.Jirka 52°North gmbh Martin-Luther-King-WegMünsterGermany Wupperverband Untere LichtenplatzerWuppertalGermany

Novel sensor technologies are rapidly *** enable a monitoring and modelling of our environment in a level of detail that was not possible a few years ***,while the raw data produced by these sensors are useful to get a first overview,it usually needs to be post-processed and integrated with other data or models in different *** this paper,we present an approach for integrating several geoprocessing components in the TaMIS water dam monitoring system developed with the Wupperverband,a regional waterbody authority in *** approach relies upon the OGC Web Processing Service and is tightly coupled with Sensor Observation Service instances running at the *** implementing the standardized XML-based interface,lightweight REST APIs have been developed to ease the integration with thin Web clients and other Web-based *** this standards-based approach,new processing facilities can be easily integrated and coupled with different observation data sources.

关键词： Geoprocessing sensor web spatial data infrastructure water monitoring dam monitoring

Visual analytics for event detection: Focusing on fraud

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Visual Informatics 2018年第4期2卷 198-212页

作者： Roger A.Leite Theresia Gschwandtner Silvia Miksch Erich Gstrein Johannes Kuntner Vienna University of Technology Austria sIT Solutions AT Spardat gmbh Austria Erste Group IT International Austria

The detection of anomalous events in huge amounts of data is sought in many *** instance,in the context of financial data,the detection of suspicious events is a prerequisite to identify and prevent attempts to ***,various financial fraud detection approaches have started to exploit Visual Analytics ***,there is no study available giving a systematic outline of the different approaches in this field to understand common strategies but also ***,we present a survey of existing approaches of visual fraud detection in order to classify different tasks and solutions,to identify and to propose further research *** this work,fraud detection solutions are explored through five main domains:banks,the stock market,telecommunication companies,insurance companies,and internal *** selected domains explored in this survey were chosen for sharing similar time-oriented and multivariate data *** this survey,we(1)analyze the current state of the art in this field;(2)define a categorization scheme covering different application domains,visualization methods,interaction techniques,and analytical methods which are used in the context of fraud detection;(3)describe and discuss each approach according to the proposed scheme;and(4)identify challenges and future research topics.

关键词： Visual knowledge discovery Time series data Business and finance visualization Financial fraud detection

Usage Scenarios for Byte-addressable Persistent Memory inHigh-Performance and Data Intensive Computing

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Journal of Computer Science & Technology 2021年第1期36卷 110-122页

作者： Michèle Weiland Bernhard Homölle EPCC The University of EdinburghEdinburgh EH89BTU.K. System Vertrieb Alexander gmbh Paderborn 33106Germany

Byte-addressable persistent memory(B-APM)presents a new opportunity to bridge the performance gap between main memory and *** this paper,we present the usage scenarios for this new technology,based on the capabilities of Intel’s *** outline some of the basic performance characteristics of DCPMM,and explain how it can be configured and used to address the needs of memory and I/O intensive applications in the HPC(high-performance computing)and data intensive *** decision trees are presented to advise on the configuration options for BAPM;their use is illustrated with two *** show that the flexibility of the technology has the potential to be truly disruptive,not only because of the performance improvements it can deliver,but also because it allows systems to cater for wider range of applications on homogeneous hardware.

关键词： byte-addressable data intensive memory intensive persistent

Phase Relationship and Properties of MgO Stabilized Zirconia as a Variation of the Sintering Conditions and the Chemistry

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China's Refractories 2017年第2期26卷 7-12页

作者： BORGER A PRIESE A LORICOURT J Center for Abrasives and Refractories Research and Development(C.A.R.R.D.)gmbh Villach 9524Austria Imerys Fused Minerals Murg gmbh Laufenburg 79725Germany

In this paper we present the results of studies on making MgO zirconia sintered parts（ intended to be used as metering nozzles in continuous casting of steel） from monoclinic zirconia and MgO powders via a granulation process. The parts were pressed and sintered under different conditions,and analysed for physical properties,microstructure and phase composition. We found a strong influence of the MgO concentration and the sintering cycle,especially the cooling rate on the thermal shock resistance. The paper concludes with recommendations for the production of zirconia metering nozzles in an economic way.

关键词： zirconia magnesia refractory granula-tion metering nozzles

Influence of Impurities of Zircon Sand on the Microstructure of Fused Zirconia Grains for Continuous Casting of Steel Refractories

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China's Refractories 2018年第1期27卷 1-7页

作者： Andreas BORGER Johan LORICOURT Angelika PRIESE Center for Abrasives and Refractories Research and Development (C.A.R.R.D.) gmbh Villach 9524 Austria Imerys Fused Minerals Murg gmbh Laufenburg 79725 Germany

Certain impurities of zircon sands, especially alumina, titania, calcia and yttria cannot be completely re- moved in the production of fused zirconia and may have an influence on the corrosion resistance and other product properties of refractories for continuous casting of steel. In this paper, we present our findings on how impurities in raw materials end up in different stabilised zirconia refractory grains, in particular calcia-, magnesia- and yttria-stabilised zirconia. The microstructure （and phase composition） is affected by both the raw materials and the fusion conditions （furnace type and cooling technology）.

关键词： zirconia zircon impurities stabilisation microstructure impurity phases

Utilizing neural networks to supplant chemical kinetics tabulation through mass conservation and weighting of species depletion

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Energy and AI 2024年第2期16卷 101-110页

作者： Franz M.Rohrhofer Stefan Posch Clemens Gößnitzer JoséM.García-Oliver Bernhard C.Geiger Know-Center gmbh Sandgasse 36Graz8010StyriaAustria LEC gmbh Inffeldgasse 19Graz8010StyriaAustria Universitat Politècnica de València Camíde VeraValència46022ValènciaSpain

Artificial Neural Networks(ANNs)have emerged as a powerful tool in combustion simulations to replace memory-intensive tabulation of integrated chemical *** reaction mechanisms,however,present a challenge for standard ANN approaches as modeling multiple species typically suffers from inaccurate predictions on minor *** paper presents a novel ANN approach which can be applied on complex reaction mechanisms in tabular data form,and only involves training a single ANN for a complete reaction *** approach incorporates a network architecture that automatically conserves mass and employs a particular loss weighting based on species *** modifications are used to improve the overall ANN performance and individual prediction accuracies,especially for minor species mass *** validate its effectiveness,the approach is compared to standard ANNs in terms of performance and ANN *** distinct reaction mechanisms(H_(2),C_(7)H_(16),C_(12)H_(26),OME_(34))are used as a test cases,and results demonstrate that considerable improvements can be achieved by applying both modifications.

关键词： Neural network approach Chemical kinetics Flamelet tabulation Mass conservation Species loss weighting

On the Simulation of Industrial Gas Dynamic Applications with the Disconti- nuous Galerkin Spectral Element Method

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Journal of Thermal Science 2016年第3期25卷 250-257页

作者： F. Hempert M. Hoffmann U. Iben C.-D. Munz Robert-Bosch gmbh Robert-Bosch Campus 1 71272 Renningen Germany Institute of Aerodynamics and Gas Dynamics Pfaffenwaldring 21 70569 Stuttgart Germany

In the present investigation, we demonstrate the capabilities of the discontinuous Galerkin spectral element method for high order accuracy computation of gas dynamics. The internal flow field of a natural gas injector for bivalent combustion engines is investigated under its operating conditions. The simulations of the flow field and the aeroacoustic noise emissions were in a good agreement with the cxperirnental data. We tested several shockcapturing techniques for the discontinuous Galerkin scheme. Based on the validated framework, we analyzed the development of the supersonic jets during different opening procedures of a compressed natural gas injector. The results suggest that a more gradual injector opening decreases the noise emission.

关键词： Discontinuous Galerkin natural gas injection supersonic under-expanded jet high performance computing

Plants and Animals as Concept Generators for the Development of Biomimetic Cable Entry Systems

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Journal of Bionic Engineering 2008年第2期5卷 167-173页

作者： Tom Masselter Uwe Scharf Thomas Speck Plant Biomechanics Group Botanic Garden of the University Freiburg Rittal gmbh & Co.KG Auf dem SttzelbergHerborn D-35745Germany

Many animals and plants have high potential to serve as concept generators for developing biomimetic materials and structures. We present some ideas based on structural and functional properties of plants and animals that led to the development of two types ofbiomimetic cable entry systems. Those systems have been realized on the level of functional demonstrators.

关键词： bionics biomimetics cable entry stents folding structures