Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
DYNAMIC BEHAVIOR ANALYSIS OF A FRAME WITH ROTATIONAL FRICTION DAMPER BY NUMERICAL AND EXPERIMENTAL METHOD
Submission Author:
Fabrício do Amaral Cristóvão , PB
Co-Authors:
Fabrício do Amaral Cristóvão, Antonio Almeida Silva, Andersson Oliveira, José Sávyo Soares Lira, Handerson Valdevino
Presenter: Antonio Almeida Silva
doi://10.26678/ABCM.COBEM2023.COB2023-1188
Abstract
The control of vibration amplitudes in structures is a highly relevant topic in the scientific-technological context, since the study of vibratory phenomena is essential to predict the dynamic behavior, extrapolating the effect of its dynamic response under external events, thus avoiding structural failures. In this paper shows a numericalexperimental procedure to analyze the dynamic behavior of a one-degree-of-freedom frame structure after the incorporation of a rotational friction damper. This damper is a device composed of aluminum disks that rotate in opposite directions, producing friction between their sliding surfaces. A compression coil spring works to apply the normal force to the friction surface, which also allows the determination of the normal force to the sliding plane from its deformed configuration, whose arrangement is mounted on a screw in the center of the damper. The behavior of the mechanism was characterized by base excitation tests under controlled conditions, exhibiting hysteresis of the same order of magnitude for a variation of cycles, which is linearly dependent on the displacement amplitude and normal force. Harmonic loads were applied, varying input parameters such as displacement amplitude, excitation frequency, and normal force. The results show that the use of the rotational friction damper as an additional damping system is capable of dissipating a large amount of vibrational energy and attenuating the vibration amplitudes of a structure, as well as providing a small increase in stiffness before the mechanism is activated, which could be an advantage over other conventional devices.
Keywords
rotational friction damper, experimental analysis, Numerical analysis, dynamic behavior., hysteretic damping.
