http://repositorio.lnec.pt:8080/jspui/handle/123456789/1007757 2026-04-04T21:10:27Z 2026-04-04T21:10:27Z Morais, J. Fortunato, E. Ribeiro, D. Calçada, R. Mendes, J. http://repositorio.lnec.pt:8080/jspui/handle/123456789/1016527 2023-10-10T13:58:48Z 2023-10-01T00:00:00Z

Railway track support condition assessment — Methodology validation using numerical simulations Morais, J.; Fortunato, E.; Ribeiro, D.; Calçada, R.; Mendes, J. Abstract A novel methodology to evaluate railway track support conditions is currently being developed. This methodology is based on modal analysis of the multi-element system composed by the railway infrastructure and an instrumented railway vehicle. It belongs to the group of vibration-based structural damage identification methods and is focused on observing the characteristic frequencies of this multi-element system, which can be related with changes in the physical properties of the railway infrastructure. As opposed to other vehicle-based track monitoring methods, the proposed methodology should enable condition assessment of the railway infrastructure subgrade, an element that is often neglected during railway monitoring operations. Since this methodology is vehicle-based, it can be used to assess the entire extension of a railway infrastructure to gather data regarding the support conditions of the track. It can also assess the evolution of track support conditions over time by comparing different rides over the same railway stretch. An important aspect of this methodology that still lacks validation is the topic of characterizing track support conditions of a railway infrastructure through its natural frequencies. The suitability of the theoretical model behind this methodology is another aspect that needs to be assessed. Numerical simulations tests using the multibody simulation software Simpack® are currently being performed to address both topics. This paper describes some of the simulations performed in this context, including a description of the numerical models used. The obtained results support the selected theoretical model and the overall validity of the proposed methodology.

2023-10-01T00:00:00Z Reis, J. P. Oliveira Costa, C. Costa , J. http://repositorio.lnec.pt:8080/jspui/handle/123456789/1012149 2019-12-05T10:26:35Z 2018-04-25T00:00:00Z

Double bridge circuit for self-validated structural health monitoring strain measurements Reis, J. P.; Oliveira Costa, C.; Costa , J. John Wiley & Sons Ltd (‘Wiley)

2018-04-25T00:00:00Z Reis, J. P. Oliveira Costa, C. Costa , J. http://repositorio.lnec.pt:8080/jspui/handle/123456789/1012148 2019-12-05T10:26:42Z 2018-08-13T00:00:00Z

Strain gauges debonding fault detection for structural health monitoring Reis, J. P.; Oliveira Costa, C.; Costa , J. John Wiley & Sons Ltd (‘Wiley)

2018-08-13T00:00:00Z Reis, J. P. Oliveira Costa, C. Costa , J. http://repositorio.lnec.pt:8080/jspui/handle/123456789/1012146 2019-12-05T10:26:47Z 2018-12-18T00:00:00Z

Local validation of structural health monitoring strain measurements Reis, J. P.; Oliveira Costa, C.; Costa , J. ELSEVIER

2018-12-18T00:00:00Z