This paper is focused on the analytical model, design, and simulation of a variable coil-based friction damper (VCBFD)
for vibration control of structures. The proposed VCBFD is composed of a soft ferromagnetic plate, made of a linear
magnetic material, and two identical thick rectangular air-core coils connected in parallel, each one attached to the plate
through a friction pad. The friction force is provided by a normal force produced through an attractive electromagnetic
interaction between the air-core coils (ACs) and the soft ferromagnetic plate when sliding relative to each other. The
magnitude of the normal force in the damper is varied by a semi-active controller that controls the command current
passing through the ACs. To demonstrate the efficiency of the proposed VCBFD and its semi-active controller, it has
been implemented on a two-degree-of-freedom (2DOF) base-isolated model subjected to the acceleration components of
three records of strong earthquakes. The results show that the performance of the proposed VCBFD in its passive-on
mode is overshadowed by the undesirable effects of stick-slip motion. However, the damper in its semi-active mode is
more successful in not only reducing the displacement of the base-floor but also avoiding stick-slip motion, due to acting
completely in its sliding phase.
Mohsen Amjadian and Anil K. Agrawal, "Vibration control using a variable coil-based friction damper," Proc. SPIE 10164, Active and Passive Smart Structures and Integrated Systems 2017, 101642J (Presented at SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring: March 29, 2017; Published: 11 April 2017); https://doi.org/10.1117/12.2257143.
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