报告题目：STOCHASTIC RESONANCES

报告时间：2025年6月11日，星期三，14:00-15:30

报告地点：龙赛理科楼南楼519会议室

主讲人：Francesco Pellicano

摘要：

The seminar aims to provide an overview of complex dynamic phenomena occurring in shells under diverse environmental conditions. It presents the results of an extensive experimental campaign on a polymeric shell subjected to purely random excitation, characterized by a narrow frequency band (almost monochromatic noise). The findings show that Extreme Events can also occur in structural systems.The system under investigation is a circular cylindrical shell, seismically excited from the base along its longitudinal axis. This type of excitation directly forces axisymmetric modes and induces autoparametric excitation of shell-like modes. Under extreme conditions—specifically, high-energy input—the system’s response to the random excitation displays unexpected spikes, which are irregular in both amplitude and temporal distribution.These spikes bear a strong resemblance to phenomena observed in neuronal models, electronic circuits, laser systems, and ocean waves. Consequently, models such as van der Pol, FitzHugh–Nagumo, Morris-Lecar, and Langevin are particularly useful for interpreting the experimental observations.The analysis of the extreme events recorded during the experiments revealed an oscillatory nature of the spikes, with spectral content matching the natural frequencies of the structure and a decay pattern similar to the transient response of free structural oscillations. For this reason, we refer to these events as “ghost hammering”—as if an invisible impact excites the shell and initiates a transient vibration.

主讲人简介：

Francesco Pellicano is Aeronautical Engineer and Ph.D. in Theoretical and Applied Mechanics, he is currently Full Professor, member of the European Academy of Sciences and Arts, member of the Executive Committee of the Applied Mechanics Division of the American Society of Mechanics Engineers ASME, General Chair of the ISVCS (International Symposium on Vibrations of Continuous Systems), Track Chair of the ASME-IMECE Conference, he was committee president of 2 BsC and 2 MsC programmes, he was Head of the Centre Intermech MoRe. He is/was coordinator (PI or local) of several projects: COMETA, NATO (composite metamaterials), THEORETIC (Electric Powertrain), DIADEM (Diagnostics and Innovative sensors), REFIMAN (industrial retrofitting), METaGEAR POR-FESR (Gears, Materials, Robotics), INDGEAR, EU-Fp7 (condition monitoring) and HPGA Fortissimo, EU-Fp7 (applications of high performance computing). He published 2 Books, more than 90 Journal papers and more than 100 conference papers. Bibliometry: 200 papers on Scopus, h-index 38, more than 4200 citations.