1,721,087 research outputs found
On the choice of the shunt circuit for single-mode vibration damping of piezoactuated structures
Full text linkThis paper deals with single-mode passive damping of piezoactuated structures. The problem of shunting in the best way a piezoelectric actuator is discussed, and a new passive shunt circuit, given by the parallel of an inductance and a capacitance in series to a resistance, is here proposed. For a su±ciently high piezoelectric coupling coe±cient, it is analytically shown to be more performant than the classical resistive-inductive shunt circuit, in the sense that it guarantees an higher exponential time decay rate of the free vibrations
Sul comportamento dinamico di ponti a sistema misto sospeso/strallato sotto l'azione di carichi mobili
No full textAnalysis of a discrete model for the contact problem between a membrane and an elastic obstacle
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Modelling and simulation of long-span bridges under aerodynamic loads
No full textThis paper deals with the dynamic stability of long-span bridges under non-stationary aerodynamic loads. Some generalizations of
classical models are presented in order to check the critical conditions both in the case of flutter and divergence for long-span bridges with particular reference to the cable-stayed scheme. Furthermore, a numerical model based on a finite volume
formulation of the flow problem around the girder cross-section is developed, able to simulate the steady and non-steady wind load
conditions on the bridge. Good agreement with wind tunnel test results is found for the Normandy Bridge design cross-section
models
On the pin-bearing failure load of GFRP bolted laminates: An experimental analysis on the influence of bolt diameter
Full text linkThis paper presents results summary of an experimental investigation aimed at evaluating the influence of the bolt diameter on the bearing failure strength of glass fibre reinforced polymer (GFRP) bolted laminates with epoxy matrix, for different values of fibre-to-load inclination angle. In this study, three different types of laminates were tested: one of them is mono-directional while the other two are bidirectional, with two different stacking sequence. Reductions in the pin-bearing ultimate load was found to be linearly dependent on bolt diameter. A pin-bearing design formula is also proposed based on experimental results
Effective torsional stiffness of composite shafts reinforced by functionally-graded fibres
No full textIn questo lavoro si considera un albero a torsione in composito fibrato a matrice isotropa e fibre cilindriche parallele all’asse, in materiale a gradazione funzionale cilindricamente ortotropo. Si determina la rigidezza torsionale omogeneizzata dell’albero e l’assetto delle tensioni tangenziali all’interfaccia fibra-matrice, in funzione dei parametri di gradazione funzionale del materiale costituente le fibre.In this paper, a fibre-reinforced composite shaft is considered, comprising functionally graded, cylindrically-orthotropic, parallel fibres embedded into a homogeneous isotropic matrix. The aim of the analysis is to determine the effective torsional stiffness of the shaft and the shear stresses at the fibre-matrix interface. In particular, the main issue is to understand how these quantities depend on the grading features of the fibres
UN’ANALISI NUMERICA PRELIMINARE ED UNDISPOSITIVO SPERIMENTALE PER LO STUDIO DEL COMPORTAMENTO DI COLLEGAMENTI BULLONATIIN STRUTTURE COMPOSITE LAMINATE. XXXV Convegno Nazionale dell'Associazione Italiana per l'Analisi delle Sollecitazioni (AIAS)
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