TY - CONF A1 - Jauregui-Correa, J. C. A1 - Otremba, Frank A1 - Romero-Navarrete, José A. A1 - Hurtado-Hurtado, G. T1 - Determination of the effect of sloshing on the railcar-track dynamic behavior N2 - Liquid cargo has a significant impact on the interface wheel-track interaction. The sloshing affects the track-railcar's dynamic behavior. The effect is detectable at the track level and at the vehicle. Its characterization requires the combination of different techniques: Empirical Mode Decomposition (EMD) Time-Frequency Maps Sloshing occurred when significant perturbations happened in the railcar: The railcar entered a curve Reduction in its travel speed A railcar with a tank is a clear example of a multibody dynamic system with a nonlinear behavior. T2 - 7th International Symposium on Multibody Systems and Mechatronics - MuSMe 2021 CY - Córdoba, Argentina DA - 12.10.2021 KW - Liquid cargo KW - Wheel-track interaction KW - Sloshing affects KW - Vehicle PY - 2021 AN - OPUS4-53572 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Würsig, Andreas A1 - Otremba, Frank T1 - Neue FVK-Tanks in den Unmodellvorschriften sowie Ergebnisse aktueller Forschungsvorhaben N2 - 100 mm of PUR-foam give satisfying results in terms of thermal properties. The non-pressure testing methods gives reliable and repeatable results. Bending modulus of laminates does not change until the first damage occurs. After that, the bending modulus decreases by 50 % but max. stress is still higher than at room temperature. T2 - 25. Gefahrgutkongress MV CY - Rostock, Germany DA - 19.10.2021 KW - FVK-Tanks KW - Unmodellvorschriften KW - Forschungsvorhaben PY - 2021 AN - OPUS4-53570 LA - mul AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Jauregui-Correa, J. C. A1 - Otremba, Frank A1 - Hurtado-Hurtado, G. A1 - Romero-Navarrete, J. A. T1 - Experimental test rig for simulating dynamic loads on subway systems N2 - Degradation in substructures, Mexico’s City Subway. Improve predictions using vibration Measurements. Ability to test operating conditions at Laboratory. Improve previous laboratory rig. Control operating conditions. Produce enough data for evaluating actual conditions. T2 - Fifth International Conference on Railway Technology CY - Montpellier, France DA - 22.08.2022 KW - Test rig KW - Simulating KW - Dynamic loads KW - Subway PY - 2022 AN - OPUS4-55568 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Fraňa, K. A1 - Attia, S. H. A1 - Otremba, Frank T1 - Numerical simulation of the filling process in the pressure bottle N2 - Parameter study for CFD in the bottle – grid resolution plays an important role on the temperature at the specific positions, 2D axi-symetrical calculation is a sufficient solution strategy in regards to the examined particular Problem. The intensity of filling process can be controlled by pressure “User defined function” provided by experiments. Numerical simulation demonstrated feasibility to predict temperature progress during the filling process successfully validated by experiments. The turbulent model k-w SST is the best strategy for the turbulent property calculations. The most intensive turbulent kinetic energy appeared in the middle region of the pressure bottle, the impact of the eddy viscosity on the wall was mostly in the wall region. T2 - ECMMM 2018 CY - Krakow, Poland DA - 10.02.2018 KW - Numerical simulation KW - Pressure bottle PY - 2018 AN - OPUS4-44177 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Otremba, Frank T1 - Hazmat tanks subjected to fire N2 - Smaleand large scale tests have been carried out. Pressure vessel –to improve numerical modelling. Thermal coating –increase of surveillance time. Numerical calculations -quantifying the safety margin. RV cannot avoid catastrophic failure. T2 - Kolloquium Gefahrgut an der UAQ CY - Queretaro, Mexico DA - 22.03.2018 KW - Hazmat KW - Tank KW - Fire PY - 2018 AN - OPUS4-44629 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Otremba, Frank T1 - Qualitätssicherung anstatt Wasserdruckprüfung? N2 - Wasserdruckprüfung kann entfallen: Schutzziel definieren, Qualitätssichernde Maßnahmen während der Herstellung, Nachweise der vorhandenen Qualität muss stetig erfolgen mittels: Betriebsüberwachung, zfP Bewertung des Standes der Technik: Zustandsorientierte Instandhaltung/Inspektion, Reduzierung von Ausfallzeiten durch optimierten Betrieb T2 - CSE-Sicherheitstage CY - Wangerooge, Germany DA - 22.04.2018 KW - Qualitätssicherung KW - Wasserdruckprüfung PY - 2018 AN - OPUS4-44817 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Otremba, Frank A1 - Romero-Navarrete, José A. T1 - Sloshing in vertical circular Tanks and Earthquakes Perturbations N2 - Tanks with capacity larger than 700 m3, could be exposed to a resonance excitation when subjected to earthquake motions, regardless of the fill level. Further studies to assess the dynamic forces linked to such resonance and close-to-resonance situations, in a context of a standard overloading situation due to sloshing forces. T2 - WCECS 2019 CY - San Francisco, CA, USA DA - 22.10.2019 KW - Sloshing KW - Tanks KW - Earthquake KW - Perturbation PY - 2019 AN - OPUS4-49408 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Otremba, Frank A1 - Romero-Navarrete, José A. T1 - A real-time GPS scheme to assess safe driving skills N2 - Avoiding road crashes has been the purpose behind many specialized software and hardware systems, involving both active and passive safety principles. Global Positioning technologies were incorporated into the transportation systems with the main purpose of acquiring the position of the vehicle under a continuous basis, for security and economy purposes. However, the GPS data can also be used for assessing the level of safety at which the vehicle is driven. On the basis of the essential data available from commercial GPS devices, in this paper we propose a combined performance measurement to assess the road safety level at which the vehicle is being driven. Such performance measure uses GPS data of the vehicle displacement, including the speed and the acceleration, as well as the course (latitude and longitude coordinates), in an integral driving assessment formulation that can run in real time. Results from the experimental use of this formulation suggest that the level of safety in the driving is time dependent, and that there are risky situations when different factors converge. T2 - ICASAT – 2019 – IEEE international Conference on Applied Science and Advanced Technology CY - Queretaro, México DA - 27.11.2019 KW - GPS Scheme KW - Safe KW - Driving PY - 2019 AN - OPUS4-49982 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Otremba, Frank T1 - Hazmat tanks subjected to fire N2 - Transport safety depends in great extent of what happens to the cargo once the carrying vehicle derails or rollovers. The exposure of tanks to direct fire is a condition that potentially involves catastrophic consequences. Studying the behavior of the contained fluid under these drastic circumstances, is critical to develop methods and techniques to mitigate the serious consequences of many mishaps. In this paper, the experimental potentials of a Particle Image Velocimetry data acquisition system are described, for providing experimental data that could be used to calibrate mathematical models. As an example of the situations that need to be modelled, an experiment is described concerning the effect of the boundary conditions and protecting devices, on the rate of variation of pressure and temperature of the fluid in a tank exposed to a direct fire. In this regard, the results emphasize the importance of equipping the vessels with both thermal insulation and safety valves. T2 - ICMEA CY - Da Nang, Vietnam DA - 16.01.2019 KW - Pool fire KW - Pressure vessel PY - 2019 AN - OPUS4-47231 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Otremba, Frank A1 - Romero-Navarrete, José A. T1 - Modelling a partly filled road tanker during an emergency braking N2 - Figure 10 illustrates the theoretical results from the simplified model considered, together with the experimental data. These results and measurements are presented one next to the other, in order to facilitate the validity analysis of the proposed simulation methodology. These results illustrate that the trends are comparable for both sets of data, that is, a similar range is obtained for all of the variables reported. A lower pressure is generated in chamber 5, which is attributed to the shorter length of this chamber. However, such increase in pressure does not correspond exactly to the difference of lengths, as the ratio of lengths would cause a differential pressure of 2.3/1.23 = 1.86, while the ratio of average pressures is on the order of 2. That is, there is an incremental, which is associated to the maximum height attained by the fluid in the chamber. The major difference between both sets of data, the experimental and theoretical, is that the theoretical do not include much of the noise and random oscillations reported in the experimental data. Such noise, however, is of very low amplitude, in comparison with the maximum values attained. The practical applications of these results could be in the area of chamber design, so that the effects of the length of the chambers be taken into account. That is, such greater lengths for the fluid in the chamber would involve larger pressures and consequently, greater stresses. However, the analysis should include an overall perspective, that is, the shortening of the chambers would imply an increase in the number of chambers, for a certain total payload, and the superposition effect of pressures, should be considered. On the other hand, the analysis could be extended to characterize the effects of the distribution of the lengths of the different chambers along the axis of the tanker, as the different resulting forces could have different effects on the pitch response of the road tanker. T2 - WCECS 2017 CY - San Francisco, CA, USA DA - 25.10.2017 KW - Tanker KW - Emergency KW - Braking PY - 2017 AN - OPUS4-42854 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -