Evaluación de los elementos amortiguantes para vehículos con dos etapas de suspensión

El trabajo plantea la evaluación del estado técnico de los elementos de amortiguación de un vehículo con dos (2) etapas de suspensión, por medio de modelos numéricos basados en la teoría de sistemas multicuerpo, a los cuales se aplica un conjunto de pruebas virtuales usando el método matemático de vectores propios. Se desarrolla una prueba basada en el análisis modal experimental (EMA) aplicada al sistema físico, como base para validar los modelos numéricos, y posteriormente el estudio se enfoca en la evaluación de la dinámica del vehículo para determinar la influencia del estado técnico de los amortiguadores en cada etapa de suspensión.The technical state of the damping elements for a vehicle having two-stage suspension was evaluated by using numerical models based on the multi-body system theory; a set of virtual tests used the eigenproblem mathematical method. A test was developed based on experimental modal analysis (EMA) applied to a physical system as the basis for validating the numerical models. The study focused on evaluating vehicle dynamics to determine the influence of the dampers’ technical state in each suspension state

Evaluating damping elements for two-stage suspension vehicles

The technical state of the damping elements for a vehicle having two-stage suspension was evaluated by using numerical models based on the multi-body system theory; a set of virtual tests used the eigenproblem mathematical method. A test was developed based on experimental modal analysis (EMA) applied to a physical system as the basis for validating the numerical models. The study focused on evaluating vehicle dynamics to determine the influence of the dampers’ technical state in each suspension state.El trabajo plantea la evaluación del estado técnico de los elementos de amortiguación de un vehículo con dos (2) etapas de suspensión, por medio de modelos numéricos basados en la teoría de sistemas multicuerpo, a los cuales se aplica un conjunto de pruebas virtuales usando el método matemático de vectores propios. Se desarrolla una prueba basada en el análisis modal experimental (EMA) aplicada al sistema físico, como base para validar los modelos numéricos, y posteriormente el estudio se enfoca en la evaluación de la dinámica del vehículo para determinar la influencia del estado técnico de los amortiguadores en cada etapa de suspensión

A study of the effect of the transition curve in the coupling elements between the carbody and the bogie

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

Identification of the technical state of suspension elements in railway systems

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