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...

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...

u(t) c 1 2 k 3 m f c Abstract A preliminary study was conducted to investigate numerical models that can be used to simulate the dynamic behaviour of a damper based on magnetorheological (MR) materials. Several articles presenting the results of experimental testing and mathematical modelling have been published recently. The goal for this study was to implement a selected model into the finite...

In this paper, we consider the implementation of a static H∞ output feedback controller to a quarter vehicle suspension system with a semi-active magnetorheological fluid (MRF) damper. Unlike most of the existing literature, all the states in the equation of motion are relative displacements and velocities between sprung, unsprung masses and road disturbance instead, in addition the input to th...

This paper discusses the damping measurements on cables with real-time controlled MR dampers that were performed on a laboratory scale single strand cable and on cables of the Sutong Bridge, China. The control approach aims at producing amplitude and frequency independent cable damping which is confirmed by the tests. The experimentally obtained cable damping in comparison to the theoretical va...

Abstract Recent developments have demonstrated that the brake pedal simulator (BPS) is becoming an indispensable apparatus for break-by-wire systems in future electric vehicles. Its main function to provide driver with a comfortable feel improve braking safety and comfort. This paper presents development control of adjustable BPS, using disk-type magnetorheological (MR) damper as passive reacti...

The transient behaviour of magnetorheological (MR) damper is a very important parameter affecting the performance this technology in modern semi-actively controlled suspension systems. Currently, MR limited by dynamics fluid (MRF) itself. significant part MRF response time hydrodynamic which connected with rheology and development velocity profile slit gap. In paper, method for measuring operat...