TY - JOUR A1 - Hurtado-Hurtado, G. A1 - Morales-Velazquez, L. A1 - Valtierra-Rodríguez, M. A1 - Otremba, Frank A1 - Jáuregui-Correa, J. C. T1 - Frequency Analysis of the Railway Track under Loads Caused by the Hunting Phenomenon N2 - Hunting is a potentially dangerous phenomenon related to the lateral oscillation of the wheels that impacts the rails and causes the wear of the infrastructure’s components. Therefore, the analysis and timely detection of hunting can lead to the application of corrective maintenance tasks, reducing damages, and costs and even derailments as a result. In this work, the vibration response of a finite element model of a rail with hunting-induced loads by a single wheel is analyzed in three directions: longitudinal, lateral, and vertical. The contact patch forces are calculated by means of Simpack® using the Kalker linear theory and the contact Hertz theory. The system is solved by using the Newmark-_ approach. The results of the deflection and vibration analysis, following the proposed methodology, show how the different characteristics of the loads impact the rail. KW - Continuous wavelet transform KW - Empirical mode decomposition KW - Finite element method KW - Frequency analysis KW - Hunting phenomenon KW - Mechanical modelling KW - Rail vibrations PY - 2022 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:b43-551517 UR - https://www.mdpi.com/2227-7390/10/13/2286/htm# VL - 10 IS - 13 SP - 1 EP - 17 PB - MDPI AN - OPUS4-55151 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Otremba, Frank A1 - Romero Navarrete, J. A. T1 - Experimental Assessing of the Energy Transformation in Turns N2 - Turning maneuvers of rail vehicles involve demanding situations for the infrastructure because of the steering forces generated and the resultant lateral load transfers. Such forcing situation involves increased tangential forces that consume kinetic energy from the vehicle. While much attention has been paid in the literature to the damage in such infrastructure segments, the energy that is dissipated in these maneuvers, has not been explicitly addressed. In this paper, a specialized scale-down infrastructure is used to characterize the effect of the initial speed of the vehicle and its mass, on the magnitude of both the rail forces developed and the amount of dissipated energy during turning maneuvers. The outputs of the experiments suggest that most of the original kinetic energy is dissipated at the first portion of the turn. Also, that the magnitude of the wheel forces and the amount of dissipated energy, correlate. That is, a greater rail damage would correspond to greater energy dissipation. T2 - IMECE2022 CY - Columbus, OH, USA DA - 30.10.2022 KW - Energy dissipation KW - Turning maneuvers KW - Rail damage KW - Experimental approaches PY - 2022 AN - OPUS4-56333 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Otremba, Frank A1 - Romero Navarrete, J. A. T1 - Experimental Assessing of the Energy Transformation in Turns N2 - Turning maneuvers of rail vehicles involve demanding situations for the infrastructure because of the steering forces generated and the resultant lateral load transfers. Such forcing situation involves increased tangential forces that consume kinetic energy from the vehicle. While much attention has been paid in the literature to the damage in such infrastructure segments, the energy that is dissipated in these maneuvers, has not been explicitly addressed. In this paper, a specialized scale-down infrastructure is used to characterize the effect of the initial speed of the vehicle and its mass, on the magnitude of both the rail forces developed and the amount of dissipated energy during turning maneuvers. The outputs of the experiments suggest that most of the original kinetic energy is dissipated at the first portion of the turn. Also, that the magnitude of the wheel forces and the amount of dissipated energy, correlate. That is, a greater rail damage would correspond to greater energy dissipation. T2 - IMECE2022 CY - Columbus, OH, USA DA - 30.10.2022 KW - Turning maneuvers KW - Energy dissipation KW - Rail damage KW - Experimental approaches PY - 2022 SP - 1 EP - 6 AN - OPUS4-56334 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Romero-Navarrete, José A. A1 - Otremba, Frank ED - Zobory, I. T1 - Conceptual design of an active centre plate N2 - The efficiency and safety of railway transportation depend both on numerous factors linked to the vehicle, the infrastructure, the operator and the environment. Curved tracks are subjected to demanding situations due to elevated stress levels, as a function of the operating conditions and vehicle/infrastructure design. In such segments, steering forces are superimposed to lateral load transfers. The steering forces depend on the condition and the design of the centre plate and bogies’ suspensions design. While the friction at the centre plate provides the needed damping to mitigate the hunting vibration of the bogie in straight track segments, such yaw resistance originates high steering forces and rail damage on curved tracks. A centre plate with low friction at turns and high friction at straight track segments would thus be highly advantageous. In this paper, a centre plate design is proposed which provides a yaw-rotation resistance torque that depends on the bogie-car relative position. Two different designs are considered for that purpose, one that combines a spring-acted centring mechanism with a lower pair kinematics, while the other one involves higher kinematic pairs which should incorporate lateral damping elements. As a result of using an engineering design approach, the higher kinematic pairs-based design is recommended however, the validation of such operational principles, including the introduction of the needed damping, should be configured on the basis of experimental models. T2 - 11th International Conference on Railway Bogies and Running Gears CY - Budapest, Hungary DA - 09.09.2019 KW - Steering torques KW - Railway transportation KW - Bogie design KW - Conceptual design KW - Engineering design KW - Transport externalities PY - 2020 SN - 978-963-9058-42-2 SP - 77 EP - 86 PB - Scientific Society of Mechanical Engineers (SSME/GTE) CY - Budapest AN - OPUS4-54086 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - 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 - CHAP A1 - Jauregui-Correa, J. C. A1 - Otremba, Frank A1 - Romero-Navarrete, José A. A1 - Hurtado-Hurtado, G. ED - Pucheta, M. ED - Cardona, A. ED - Preidikman, S. ED - Hecker, R. T1 - Determination of the Effect of Sloshing on the Railcar-Track Dynamic Behavior N2 - This paper presents the study of the impact caused by a liquid Cargo on a railway infrastructure. The dynamic behavior of a tank car corresponds to a multibody dynamic system with several degrees of freedom. This study’s data were obtained from a scale experimental fixture consisting of a track and a railcar with a tank. The track was instrumented with strain gauges and the railcar with accelerometers. The data showed non-periodic and periodic terms; therefore, the results were analyzed with the Empirical Mode Decomposition method (EMD). It was found that the EMD identified the signal components that were related to the sloshing. These components represent the mode shapes of the original signal. The location of the sloshing in the track was found applying spectrograms to the accelerometer data. This paper’s experimental outputs suggest that the sloshing effect is detectable at the track and in the vehicle dynamics. KW - Sloshing effect KW - Empirical Mode Decomposition KW - Wheel/track interaction KW - Multibody dynamics PY - 2021 SN - 978-3-030-88750-6 U6 - https://doi.org/10.1007/978-3-030-88751-3_14 SP - 131 EP - 140 PB - Springer Nature Switzerland AG AN - OPUS4-53561 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 - Werner, Jan A1 - Kutz, P. W. A1 - Otremba, Frank T1 - Testing of Small Scale Tank Prototypes under Cryogenic Conditions N2 - Climate change, CO2 reduction, resource efficiency are only 3 current keywords that describe the current industrial-economic situation. In order to influence climate change effectively, the conversion of supply systems with technically usable forms of energy must succeed in the next decade. The international network founded in Baku in 2015 bundles research activities in the broad field of energy supply and energy efficiency. Discuss current research approaches and results with scientists and experts from renowned universities and follow Azerbaijan's efforts to implement the energy revolution. T2 - Neseff 2020 CY - Online meeting DA - 28.09.2020 KW - Mud pumps KW - Mud circulation system KW - Pistons KW - Hydrostatic pressure KW - Friction wear KW - Ceramic liners KW - Tribology PY - 2020 SN - 978-3-940471-59-8 SP - 4 EP - 9 AN - OPUS4-52149 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Romero Navarrete, J. A. A1 - Otremba, Frank A1 - Lozano Guzmán, A. A. T1 - Experimental-theoretical modelling of the lateral sloshing in rail tankers N2 - The objective of this paper is to describe and to validate a simplified pendulum-analogy model to simulate the interaction of a liquid cargo with ist carrying vehicle. The resulting testing rig consists of a rectangular container, spring supported on a two wheelset-bogie having a scale down of 1/10 with respect to a full-size equipment. The testing rig is used to validate a simple pendulum-based, simplified three degree-of-freedom mathematical model of the response of a partially filled container to lateral accelerations. The length of the pendulum is set according to validated methodologies. The resulting mathematical scheme reveals a high correlation with the experimental output, on the order of 99%, while some other performance measures, related to the peak forces and the range of variation of the wheel-rail forces, also show good concordance with the experimental results. KW - Sloshing KW - Rail tankers KW - Pendulum analogy KW - Experimental modelling KW - Mechanical fatigue PY - 2021 U6 - https://doi.org/10.1504/ijhvs.2021.117504 VL - 28 IS - 3 SP - 435 EP - 454 AN - OPUS4-53101 LA - eng 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 - Scaled-down experimental facility: Can reproduce actual failures; can produce simulated data for identifying cracks in the substructure or other defects. The acceleration data can be converted into an equivalent deformation. The experimental facility can analyse dynamic loads. Equivalent force data: Facilitates the application to a health monitoring system; simplifies the development of predictive maintenance. These data is helpful in validating analytical or simulation models. T2 - Fifth International Conference on Railway Technology CY - Montpellier, France DA - 22.08.2022 KW - Test rig KW - Dynamic loads KW - Subway system PY - 2020 SP - 1 EP - 6 AN - OPUS4-55566 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -