Magnetorheological dampers have raised as promising devices for structural seismic protection since they have many attractive features such as small power requirements, reliability, and relatively low cost. These devices have strongly nonlinear behaviour which is very difficult to characterize. For this reason, the modelling of MR dampers has been an active field during the last years and has p...

Magnetorheological (MR) dampers represent one of the most promising semi-active control devices for applications aiming at the seismic risk mitigation of new or existing civil structures. Two 30 kN MR dampers were experimentally tested subjecting them to assigned conventional displacement laws at their ends. The paper describes the main results of the above experimental activity and aims at imp...

A key feature of magnetorheological fluid is its variability rheological properties in which upon exposing this fluid, the viscosity changes accordingly. Hence nature can be implemented various engineering applications. To understand influence a (MR) damper, it essential to study flow behaviour using computational and numerical methods. The main objective work estimate external magnetic field o...

Magnetorheological (MR) dampers, used as intelligent semi-active vibration control devices to achieve low energy consumption, fast response, controllability, and other capabilities are generally installed with a variety of sensors on their exterior ensure that the damping force can be accurately controlled. However, external often affected by complications reduce reliability damper, cost poweri...

In this study, the dynamic range and dispersion stability of a shear-type magnetorheological (MR) grease damper were experimentally investigated as important characteristics affecting performance semi-active vibration suppression. Furthermore, was applied to suppression small single-degree-of-freedom model structure subjected seismic excitation. The test results indicated that it has 157 times,...

The increase in bearing displacements of sliding isolated buildings due to near-fault earthquakes, with long-period pulse type of ground motion, is an important problem. Often, supplemental nonlinear passive dampers are incorporated into the isolation system to reduce the base displacements; however, this may increase the interstory drifts and accelerations in the superstructure. Hence, there i...

This paper presents the modeling and simulation of a magnetorheological damper based semiactive suspension using variable structure controllers. Passive suspension systems tend to limit the trade-off between passenger comfort and road handling. But Semiactive suspensions can reduce this trade-off margin and dynamically respond to the damping requirements. Active suspensions provide the best res...

An adaptive sliding mode controller for vibration control is proposed in this paper for structures embedded with magnetorheological (MR) dampers. Civil structures and buildings are liable to damages during earthquake periods. The application of structural control methodologies is important in order to suppress vibrations due to seismic phenomena and dynamic loading. The use of sliding mode cont...

This chapter provides an introduction to semi active control of base isolated buildings using magnetorheological (MR) dampers. Recently developed nonlinear control algorithms are discussed. First a fuzzy logic control (FLC) is designed to decide how much voltage is required to be supplied to the MR damper for a desired structural response. The FLC is optimized using micro genetic algorithm. A n...

To effectively suppress the horizontal vibration of a high-speed elevator car caused by uncertainties such as irregularity guide rails and piston wind in hoistway, this paper proposes new variable universe fuzzy control method for semi-active shoes with magnetorheological (MR) dampers based on firefly algorithm backpropagation (FA-BP) neural network (FNN). First, dynamic model system is constru...