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Parametric reduced-order models via SSMs for imperfect structures
Abbreviations Context Complex mechanical structures are typically analysed using FE models with hundreds of thousands to millions of DOFs. Computing their nonlinear dynamic response can be prohibitively expensive, as internal forces and, for implicit solvers, tangent stiffness matrices must be repeatedly evaluated during time integration. Reduced-order models address this challenge by describing the dynamics through a small number of dominant coordinates, extending the idea of modal reduction to nonlinear systems. In particular, SSM-based methods provide a systematic framework for constructing nonlinear ROMs and efficiently computing the frequency response of large FE models. Project Although SSM-based ROMs enable efficient simulations, their… Read more
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Experimental nonlinear identification of a pantograph model using CBC techniques
This thesis focuses on the nonlinear identification of a railway pantograph using Control-Based Continuation (CBC), a class of experimental techniques that enables the reconstruction of the nonlinear frequency response of a system under closed-loop operation. The goal is to develop and validate a methodology to identify the main nonlinear features of the pantograph, such as amplitude-dependent stiffness and damping effects, starting from experimental or numerical data. The work may include the definition of a reduced-order model, the implementation of CBC-based tests, the analysis of the measured response, and the comparison between identified and reference dynamics. The thesis will involve both… Read more
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Topology Optimization in nonlinear dynamics: internal and parametric resonances
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