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Z. Dimitrovová^1,2

¹Department of Civil Engineering, NOVA School of Science and Technology, Caparica, Portugal
²IDMEC, Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal

doi:10.4203/ccc.7.29.1

Z. Dimitrovová, "Analysis of the Negative Effect of High Damping on the Instability of Moving Inertial Objects", in J. Pombo, (Editor), "Proceedings of the Sixth International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Edinburgh, UK, Online volume: CCC 7, Paper 29.1, 2024, doi:10.4203/ccc.7.29.1

Keywords: layered track models, critical velocity, instability, moving proximate masses, integral transforms, instability lines.

Abstract

In this paper, layered track models are investigated in terms of detecting cases that may be dangerous for track design. Usually, track design is guided by recommendations to avoid exceeding the critical velocity, which is determined as the lowest velocity of waves propagation in the structure, which in turn is equal to the critical velocity of a single moving constant force. Such reasoning does not take into account the anomalous Doppler effect causing a moving inertial object to become unstable. It has been shown in the author's previous works that this effect becomes more dangerous when two close objects are considered, and is generally exacerbated by increased damping, which is contrary to common sense. This paper sheds more light on this deleterious effect and discusses its implications for track design.

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Front Page Browse CCC CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Conferences ISSN 2753-3239 CCC: 7 PROCEEDINGS OF THE SIXTH INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE Edited by: J. Pombo Paper 29.1 Analysis of the Negative Effect of High Damping on the Instability of Moving Inertial Objects Z. Dimitrovová^1,2 ¹Department of Civil Engineering, NOVA School of Science and Technology, Caparica, Portugal ²IDMEC, Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal doi:10.4203/ccc.7.29.1 Full Bibliographic Reference for this paper Z. Dimitrovová, "Analysis of the Negative Effect of High Damping on the Instability of Moving Inertial Objects", in J. Pombo, (Editor), "Proceedings of the Sixth International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Edinburgh, UK, Online volume: CCC 7, Paper 29.1, 2024, doi:10.4203/ccc.7.29.1 Keywords: layered track models, critical velocity, instability, moving proximate masses, integral transforms, instability lines. Abstract In this paper, layered track models are investigated in terms of detecting cases that may be dangerous for track design. Usually, track design is guided by recommendations to avoid exceeding the critical velocity, which is determined as the lowest velocity of waves propagation in the structure, which in turn is equal to the critical velocity of a single moving constant force. Such reasoning does not take into account the anomalous Doppler effect causing a moving inertial object to become unstable. It has been shown in the author's previous works that this effect becomes more dangerous when two close objects are considered, and is generally exacerbated by increased damping, which is contrary to common sense. This paper sheds more light on this deleterious effect and discusses its implications for track design. download the full-text of this paper (PDF, 9 pages, 862 Kb) go to the previous paper go to the next paper return to the table of contents return to the volume description
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