Semiactive control systems that offer the reliability of passive control systems as well as the versatility and adaptability of active control systems have received significant attention for structural vibration control (Jung et al., 2004). Magnetorheological (MR) fluid dampers have emerged as such a class of semiactive damping devices. By activating the MR fluid contained in the device through...

Many publications show that the ride comfort of a railway vehicle can be significantly improved using semi-active damping control lateral secondary dampers. However, efficiency depends on selection algorithm and damper dynamic behaviour, i.e., its force rise response time, drop time range. This paper examines influence these parameters magnetorheological (MR) S/A for several algorithms. One new...

Experience in manufacturing MR fluids for commercial application has shown that some of the greatest barriers to commercial success are not factors or conditions normally considered in the laboratory. The present paper looks at conditions found in MR fluid devices operating in real-world applications where shear rates may exceed 10 5 sec and devices are called upon to operate for very long peri...

This paper investigates the performance of the semiactive control system based on magnetorheological fluid (MR) dampers for suppressing excessive vibration of stay cable installed in cable-stayed bridges under wind load. The cable model is extracted from a 156.3 m long stay cable with high tension. The external wind load is generated from the widely used wind load spectrum such as the Kaimal sp...

Magnetorheological (MR) fluids are substances that respond to an applied magnetic field with a change in their rheological behavior. Though they are functionally similar to electrorheological (ER) fluids, MR fluids exhibit much higher yield strengths for applied magnetic fields than ER fluids for applied electric fields. The devices using MR fluids have an ability to provide high-torque, low-in...

A Magneto-Rheological (MR) fluid brake is a device to transmit torque by the shear force of an MR fluid. An MR rotary brake has the property that its braking torque changes quickly in response to an external magnetic field strength. In this paper, the design method of the cylindrical MR fluid brake is investigated theoretically. The mechanical part is modeled using Bingham’s equation, an approa...

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,...

Wireless sensor networks have rapidly matured in recent years to offer data acquisition capabilities on par with those of traditional tethered data acquisition systems. Entire structural monitoring systems assembled from wireless sensors have proven to be low-cost, easy to install and accurate. However, the functionality of wireless sensors can be further extended to include actuation capabilit...