Examinando por Materia "Automobile bodies"
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Ítem Electric public transport vehicle with composite material body diagnostic - User safety(EDP Sciences, 2018-01-01) Escobar M.; Cadena D.; Francisco Castañeda L.; Universidad EAFIT. Departamento de Ingeniería Mecánica; Estudios en Mantenimiento (GEMI)The project contemplated the elaboration of modules of composite material, with which a bus body of less weight was built, compared with the traditional kind, and adapted for the chassis that are currently being used in the city. The structure was prepared for the evaluation of the security space of the future users. The panels were instrumented with different sensors and configured to the conditions of the test by means of a data acquisition system. The test was carried out following the procedure of regulation 66 of the UNECE. The results obtained demonstrated the feasibility of using this type of bodywork in public transport. © The Authors, published by EDP Sciences, 2018.Ítem Identification of the technical state of suspension elements in railway systems(TAYLOR & FRANCIS LTD, 2012-01-01) Mauricio Martinod, Ronald; Rene Betancur, German; Castaneda Heredia, Leonel Francisco; Universidad EAFIT. Departamento de Ingeniería Mecánica; Estudios en Mantenimiento (GEMI)The running safety and passenger comfort levels in a vehicle are tightly related to the technical state of the suspension elements. The technical state of the suspension depends of the service life time as its components become old and wear out. In this paper, a study on the dynamic behaviour of a railway vehicle is established in relation to the damping elements in one of its suspension stages. An experimental measurement model is developed, obtaining a set of useful signals for the identification of the dynamic parameters of the vehicle and developing a test through the application of the operational modal analysis technique, using least-squares complex exponential method as a basis to validate the numerical model of the multi-body system. Then, the study focuses on developing numerical simulations for the identification of the technical state of the dampers by the registration of dynamic variables under commercial service conditions and on estimating the state of the suspension elements. © 2012 Taylor & Francis.Ítem A study of the effect of the transition curve in the coupling elements between the carbody and the bogie(INDERSCIENCE ENTERPRISES LTD, 2014-01-01) Martinod, Ronald M.; Betancur, German R.; Osorio, Jose F.; Castaneda, Leonel F.; Universidad EAFIT. Departamento de Ingeniería Mecánica; Estudios en Mantenimiento (GEMI)This work describes an analysis of the effect of the transition curves in the coupling elements between the carbody and the bogie, by means of recorded variables under commercial operation conditions of a railway vehicle. A set of field tests are developed and applied to the railway system as a basis to validate a numerical model. The dataset is obtained from a numerical model based on the multi-body systems theory using a transient method. The study focuses on the dynamic evaluation of the vehicle to determine the transversal dynamic effect generated by the circulation in the transition curve sections, especially in curves with short radius. The work includes a case study of a passenger railway, and it is used to identify aspects of the railway system that could be improved by the operators, such as inspection routines, rail track design and elements subjected to considerable loads. Copyright © 2014 Inderscience Enterprises Ltd.