Abstract
Stochastic flexural vibrations of small-scale Bernoulli–Euler beams with external damping are investigated by stress-driven nonlocal mechanics. Damping effects are simulated considering viscous interactions between beam and surrounding environment. Loadings are modeled by accounting for their random nature. Such a dynamic problem is characterized by a stochastic partial differential equation in space and time governing time-evolution of the relevant displacement field. Differential eigenanalyses are performed to evaluate modal time coordinates and mode shapes, providing a complete stochastic description of response solutions. Closed-form expressions of power spectral density, correlation function, stationary and non-stationary variances of displacement fields are analytically detected. Size-dependent dynamic behaviour is assessed in terms of stiffness, variance and power spectral density of displacements. The outcomes can be useful for design and optimization of structural components of modern small-scale devices, such as micro- and nano-electro-mechanical-systems.
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Acknowledgements
Financial supports from the MIUR in the framework of the Projects PRIN 2015 “COAN 5.50.16.01” (code 2015JW9NJT Advanced mechanical modeling of new materials and structures for the solution of 2020 Horizon challenges) and PRIN 2017 (code 2017J4EAYB Multiscale Innovative Materials and Structures (MIMS); University of Naples Federico II Research Unit) and from the research program ReLUIS 2019 are gratefully acknowledged.
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Pinnola, F.P., Vaccaro, M.S., Barretta, R. et al. Random vibrations of stress-driven nonlocal beams with external damping. Meccanica 56, 1329–1344 (2021). https://doi.org/10.1007/s11012-020-01181-7
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DOI: https://doi.org/10.1007/s11012-020-01181-7