Abrégé

The invention relates to a method for determining structural parameters of a railway track comprising a sensor array. The method comprises measuring at least the vertical and/or lateral irregularities of said rail with the sensor array along the rail, thereby providing signals corresponding to the geometrical irregularities at different distance from the wheel-load. A model is provided describing the deflection shape of a rail, wherein the deflection shape is dependent on structural parameters of the rail and on the loads on the rail, said model being stored in the processor. In the processor said geometrical irregularities are compared under different load influence for generating a measured deflection shape. At least one theoretical rail deflection shape is generated using the model by varying the structural parameters and the load in the model. At least one of said theoretical deflection shapes is compared with said measured deflection shape for each point of the rail, and the structural parameters of that theoretical deflection shape which best matches said measured deflection shape are determined. An apparatus configured to perform the method is also provided.

Classes IPC  ?

• B61K 9/08 - Installations de mesure pour surveiller la voie
• E01B 35/12 - Applications des appareils ou dispositifs de mesure à la construction des voies pour mesurer le déplacement de la voie ou de ses composants au passage des charges, p. ex. l'affaissement des traverses, l'augmentation de l'écartement
• G01M 5/00 - Examen de l'élasticité des structures ou ouvrages, p. ex. fléchissement de ponts ou d'ailes d'avions

Abrégé

This invention relates to a method for establishing the deflection and/or the stiffness of a supporting structure which is subjected to a load. The method comprises the steps of moving a measurement vehicle along the supporting structure, the vehicle having a loaded axle, a first measuring system being a first versine system and a second measuring system being one of an inertia based system and a second versine system. At a predetermined sampling rate, two sets of levels are measured using the two measuring systems. The two sets of levels are converted or transformed such that they relate to the same reference system and, thereafter, for each pair of sampled levels, the difference between the two levels is calculated such that the contribution to the measurements originating from unloaded irregularities in the supporting structure is eliminated, whereafter the deflection and/or the stiffness of the supporting structure is established from the calculated difference.

Classes IPC  ?

• E01B 35/12 - Applications des appareils ou dispositifs de mesure à la construction des voies pour mesurer le déplacement de la voie ou de ses composants au passage des charges, p. ex. l'affaissement des traverses, l'augmentation de l'écartement
• B61K 9/08 - Installations de mesure pour surveiller la voie
• G01C 7/04 - Tracé de profils des surfaces du terrain mettant en jeu un véhicule qui se déplace le long du profil à tracer
• G01M 5/00 - Examen de l'élasticité des structures ou ouvrages, p. ex. fléchissement de ponts ou d'ailes d'avions

Abrégé

The present invention relates to a method and device for determining at least a first parameter of a track: the method comprises providing first track geometry quality data (110, 120) associated to at least one point along a rail at a first temperature, providing second track geometry quality data (130, 140) associated to said at least one point at a second temperature, describing (160) a difference between the first and second track geometry quality data by means of a model relating the first and second track geometry quality data with associated temperatures to stress free temperature and/or track resistance, and estimating (170) the stress free temperature and/or track resistance in said at least one point based on the model.

Classes IPC  ?

• E01B 35/06 - Applications des appareils ou dispositifs de mesure à la construction des voies pour mesurer les irrégularités dans le sens longitudinal
• B61K 9/00 - Gabarits de profils des véhicules ferroviairesDétection ou indication de l'échauffement excessif des organesDispositifs sur les locomotives ou les wagons indiquant les sections défectueuses de la voieCaractéristiques générales des véhicules d'auscultation de la voie
• B61L 23/04 - Dispositifs de commande, d'avertissement ou autres dispositifs de sécurité le long de la voie ou entre les véhicules ou les trains pour contrôler l'état mécanique de la voie
• G01L 5/00 - Appareils ou procédés pour la mesure des forces, du travail, de la puissance mécanique ou du couple, spécialement adaptés à des fins spécifiques