Research stay at UC3M: DEPARTMENT OF MECHANICAL ENGINEERING
Project: Non-destructive evaluation techniques for identification and diagnosis of mechanical systems, and related inverse problems.
Non-Destructive Evaluation (NDE) techniques for identification and diagnosis constitute an interdisciplinary research field of up-to-date international relevance in several engineering areas. Applications of NDE methods lead to inverse problems, that is problems in which one wishes to determine some mechanical or geometrical property of a system on the basis of measurements of its response. Therefore, pathologies typical of this class of problems occur, such as non-uniqueness of the solution or non-continuous dependence of the solution on the data. When NDE techniques are applied to the study of real mechanical systems, additional difficulties arise because of the complexity of structural modelling, the inaccuracy of the analytical models used for the interpretation of the experiments and the effect of measurement errors.
Aim of the project is to give a contribution on the study of the identification and diagnostic techniques via NDE methods under both the general and practical aspects. One goal of the research concerns with the detection of defects in plates by natural frequency measurements. In particular, an extension of the so-called Fourier Coefficient Method, originally developed for damage detection in beams, will be attempted, and the identification of localized defects by minimal natural frequency data will be considered. Another topic is the identification of cracks in rotating shafts, a subject on which the research team FABDIS of the Department of Mechanical Engineering of the Universidad Carlos III de Madrid has significant experience. In this case, the different sensitivity of the various natural frequencies to damage will be explored in order to localize the defects. In connection with the above topics, the construction of vibrating systems with localized singularities/defects and having specified spectral properties will be also investigated.
Stay period: OCT 2013 - SEP 2014