An experimental study on the vibration of a payload isolated through a quasi-zero stiffness (QZS) isolator subject to vertical ground motion is presented. QZS isolators exploit kinematic nonlinearities to enhance the vibration attenuation of a linear mass-spring system. In this paper, stepped-sine tests have been performed to identify the system parameters and determine the isolator transmissibility. The parameter identification has been carried out by fitting a phenomenological model to the experimental data. The QZS isolator transmissibility exhibits a natural frequency reduction, and the system effectively suppresses the ground harmonic vibration about the fundamental frequency of the mass-spring isolator. A non-negligible presence of dry friction has been observed, leading to the stick-slip phenomenon, and affecting the suspension activation at low frequencies. Then, the suspension response under different realistic earthquake signals is presented and critically discussed.
An experimental study on the vibration of a payload isolated through a quasi-zero stiffness (QZS) isolator subject to vertical ground motion is presented. QZS isolators exploit kinematic nonlinearities to enhance the vibration attenuation of a linear mass-spring system. In this paper, stepped-sine tests have been performed to identify the system parameters and determine the isolator transmissibility. The parameter identification has been carried out by fitting a phenomenological model to the experimental data. The QZS isolator transmissibility exhibits a natural frequency reduction, and the system effectively suppresses the ground harmonic vibration about the fundamental frequency of the mass-spring isolator. A non-negligible presence of dry friction has been observed, leading to the stick-slip phenomenon, and affecting the suspension activation at low frequencies. Then, the suspension response under different realistic earthquake signals is presented and critically discussed.
Nonlinear isolators for civil applications / Iarriccio, G.; Zippo, A.; Molaie, M.; Pellicano, F.. - 2023:1(2023), pp. 1-3. (Intervento presentato al convegno 19th International Conference on Condition Monitoring and Asset Management, CM 2023 tenutosi a Northampton nel 2023) [10.1784/cm2023.4d6].
Nonlinear isolators for civil applications
Iarriccio G.;Zippo A.;Molaie M.;Pellicano F.
2023
Abstract
An experimental study on the vibration of a payload isolated through a quasi-zero stiffness (QZS) isolator subject to vertical ground motion is presented. QZS isolators exploit kinematic nonlinearities to enhance the vibration attenuation of a linear mass-spring system. In this paper, stepped-sine tests have been performed to identify the system parameters and determine the isolator transmissibility. The parameter identification has been carried out by fitting a phenomenological model to the experimental data. The QZS isolator transmissibility exhibits a natural frequency reduction, and the system effectively suppresses the ground harmonic vibration about the fundamental frequency of the mass-spring isolator. A non-negligible presence of dry friction has been observed, leading to the stick-slip phenomenon, and affecting the suspension activation at low frequencies. Then, the suspension response under different realistic earthquake signals is presented and critically discussed.
Pubblicazioni consigliate
I metadati presenti in IRIS UNIMORE sono rilasciati con licenza Creative Commons CC0 1.0 Universal, mentre i file delle pubblicazioni sono rilasciati con licenza Attribuzione 4.0 Internazionale (CC BY 4.0), salvo diversa indicazione.
In caso di violazione di copyright, contattare Supporto Iris
