In the context of the periodic monitoring of bridges or other civil artifacts, characterized by low natural frequencies, a vibration excitation system is proposed for the dynamic monitoring. The system is based on a mass suspended on an air spring and excited to vibrate in resonance condition by means of an electrodynamic exciter (EDE). Therefore, the energy supplied by the EDE to the mass is small thanks to the resonance conditions. To perform a sweep excitation, the stiffness characteristics of the spring can be continuously modified, adjusting the air pressure of the spring and, consequently, the frequency and the amplitude of the exciting action provided by the EDE. The paper presents the description of the device and some evaluations based on experimental tests conducted on the air spring.
A Vibration Exciter for Dynamic Testing of Large Structures
De Falco D.;
2023
Abstract
In the context of the periodic monitoring of bridges or other civil artifacts, characterized by low natural frequencies, a vibration excitation system is proposed for the dynamic monitoring. The system is based on a mass suspended on an air spring and excited to vibrate in resonance condition by means of an electrodynamic exciter (EDE). Therefore, the energy supplied by the EDE to the mass is small thanks to the resonance conditions. To perform a sweep excitation, the stiffness characteristics of the spring can be continuously modified, adjusting the air pressure of the spring and, consequently, the frequency and the amplitude of the exciting action provided by the EDE. The paper presents the description of the device and some evaluations based on experimental tests conducted on the air spring.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
