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Methodology for determination of anaerobic digestion kinetics using a bench top digester
Marko Tramšek, Andreja Goršek, Peter Glavič, 2007, original scientific article

Abstract: This paper presents a methodology for determining the microbial growth kinetics of an ideal anaerobic process in a non-ideal laboratory anaerobic digester (Armfield). Some laboratory experiments were performed, to confirm the proposed methodology. Having the same zero biomass concentration, some process parameters were changed and their influence on substrate outlet concentration was monitored. The specific growth rate of the biomass, the saturation constant of the substrate, and the yield coefficient were calculated, on the basis of the measured values. These parameters enabled us to perform a dynamic simulation of an anaerobic process in ideal continuously-stirred tank reactors (CSTR). The results represented the mass concentration profiles for substrate and biomass, from which the time required for reaching the steady state (60 d), where the operation is optimal, could be determined. The laboratory anaerobic digester provided operational process data, which are applicable for wastewater treatment plant design purposes.
Keywords: wastewater treatment, anaerobic digester, kinetics, dynamic simulation
Published: 31.05.2012; Views: 1406; Downloads: 71
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Experimental and numerical evaluation of the mechanical behavior of strongly anisotropic light-weight metallic fiber structures under static and dynamic compressive loading
Olaf Andersen, Matej Vesenjak, Thomas Fiedler, Jehring, Lovre Krstulović-Opara, original scientific article

Abstract: Rigid metallic fiber structures made from a variety of different metals and alloys have been investigated mainly with regard to their functional properties such as heat transfer, pressure drop, or filtration characteristics. With the recent advent of aluminum and magnesium-based fiber structures, the application of such structures in light-weight crash absorbers has become conceivable. The present paper therefore elucidates the mechanical behavior of rigid sintered fiber structures under quasi-static and dynamic loading. Special attention is paid to the strongly anisotropic properties observed for different directions of loading in relation to the main fiber orientation. Basically, the structures show an orthotropic behavior; however, a finite thickness of the fiber slabs results in moderate deviations from a purely orthotropic behavior. The morphology of the tested specimens is examined by computed tomography, and experimental results for different directions of loading as well as different relative densities are presented. Numerical calculations were carried out using real structural data derived from the computed tomography data. Depending on the direction of loading, the fiber structures show a distinctively different deformation behavior both experimentally and numerically. Based on these results, the prevalent modes of deformation are discussed and a first comparison with an established polymer foam and an assessment of the applicability of aluminum fiber structures in crash protection devices is attempted.
Keywords: aluminum fiber, fiber structure, orthotropy, sintering, compression, static loading, dynamic loading, energy absorption, numerical simulation
Published: 21.06.2017; Views: 289; Downloads: 172
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Behavior of metallic foam under shock wave loading
Matej Vesenjak, Matej Borovinšek, Zoran Ren, Seiichi Irie, Shigeru Itoh, 2012, original scientific article

Abstract: In this manuscript, the behavior of metallic foam under impact loading and shock wave propagation has been observed. The goal of this research was to investigate the material and structural properties of submerged open-cell aluminum foam under impact loading conditions with particular interest in shock wave propagation and its effects on cellular material deformation. For this purpose experimental tests and dynamic computational simulations of aluminum foam specimens inside a water tank subjected to explosive charge have been performed. Comparison of the results shows a good correlation between the experimental and simulation results.
Keywords: metal foam, shock wave loading, experimental testing, dynamic simulation
Published: 21.06.2017; Views: 396; Downloads: 210
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O identifikaciji parametrov sinhronskega generatorja med obratovanjem z uporabo linearnega ekvivalenta
Gorazd Bone, Urban Rudež, Rafael Mihalič, published scientific conference contribution

Abstract: V članku je obravnavana zmožnost identifikacije parametrov sinhronskega generatorja iz dinamičnih meritev na priključnih sponkah z uporabo linearnega ekvivalenta. Predstavljena je metoda, ki to izvede z izčrpnim pregledovanjem. Uporabljeni model generatorja ima po dve dušilni navitji na vsaki od osi rotorjev. Ker so meritve izvedene na priključnih sponkah je dinamika rotorjevega kota in vrtilne hitrosti nepoznana. Za namen študije se je simuliralo delovanje sinhronskega generatorja priključenega na togo mrežo. V simulaciji se je vzbujalna napetost stopničasto spremenila. Za iskanje parametrov sinhronskega generatorja je bilo uporabljeno izčrpno preiskovanje možnih parametrov, saj se s to metodo lahko najde vse možne kombinacije parametrov, ki zadovoljujejo kriterije identifikacije. Ob ugotovitvi, da nekateri parametri ne vplivajo na nekatere merjene signale, se je pojavila možnost uporabe razcepljene identifikacije. Brez omenjene razcepitve izčrpna metoda iskanja ne bi bila izvedljiva. Ker je bilo v študiji ugotovljeno, da zelo različni parametri dajejo zelo podobne rezultate za dinamične signale avtorji zaključijo, da parametrov modela generatorja osmega reda ne moremo identificirati z identifikacijskimi metodami, ki uporabljajo linearne ekvivalente.
Keywords: digital simulation, synchronous generator, dynamic system identification, linearization
Published: 10.10.2017; Views: 230; Downloads: 39
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Electrified powertrain configurator
Jernej Kosi, 2019, master's thesis

Abstract: This master’s thesis describes the development, use and simulation results of the Excel based electrified powertrain configurator tool. First, different electrified powertrains are introduced and divided based on the powertrain type. Within the scope of this master’s thesis, we focused on battery electric vehicles. A mathematical vehicle model was developed to describe different battery electric vehicle powertrain architectures. The mathematical vehicle model was implemented in Excel. The performance of the Excel tool was demonstrated by simulating various driving cycles. To evaluate the accuracy and usability of the tool, simulation results from Excel tool were compared with those from AVL Cruise.
Keywords: electrified powertrain, vehicle longitudinal dynamic, driving simulation, Excel, tool development
Published: 23.12.2019; Views: 90; Downloads: 0

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