The paper discusses the design and performance of a novel type of passive control system used for suppressing unwanted vibrations in civil engineering structures subjected to both lateral and base excitation. The new control system is inspired by the traditional tuned mass damper (TMD) with the modification that the mass is replaced by an inerter. An inerter has a two-terminal flywheel device c...

The Viscous Beam is a wearable tremor-suppression orthosis that applies viscous resistance to motion of the wrist in flexion and extension. The orthosis reduces tremor amplitude and is small enough to be worn under the sleeve of a shirt. Hand and forearm cuffs couple the damper to the user. The cuffs permit full thumb and finger motion, wrist flexion and extension, and forearm pronation and sup...

The paper presents the semi-active vibration control based on the Skyhook algorithm which benefits from the adaptively tuned inverse magnetorheological (MR) damper model. The structure of the inverse model consists of the atan function and a linear viscous damping component. The proposed algorithm was tested by simulation of the quarter-car suspension model subjected to multiple bump road excit...

The efficacy of dampers in providing seismic protection has been validated by the excellent performance of buildings fitted with dampers in the past earthquakes. However, previous studies have not accounted for the limit states of dampers. Recently, a multi-year research project was completed that investigated the seismic performance of building with dampers subject to large earthquakes. It was...

This paper considers the use of a tuned inerter damper (TID) system for suppressing unwanted cable vibrations. The TID consists of an inerter, a device that exerts a force proportional to relative acceleration, coupled with a parallel spring and damper. It may be thought of as similar to a tuned-mass-damper, but requiring two terminals. As a two terminal device, the performance of the TID is co...

This paper investigates the use of inerters for vibration suppression of a multistorey building structure. The inerter was proposed as a two-terminal replacement for the mass element, with the property that the applied force is proportional to the relative acceleration across its terminals. It completes the force-current mechanical-electrical network analogy, providing the mechanical equivalent...

This study aims to develop a knee-brace friction damper for mid-rise timber frame buildings. First, time history seismic response analysis was conducted investigate the performance of improve four-story building. Then, static cyclic loading test on beam-column joint with/without prototype carried out verify effectiveness damper. It is found that mitigates slip behavior and increases equivalent ...

In this paper, acoustic radiation response of thin-walled box with particle dampers is predicted. First, the effect of the collisions and friction between the granular inter-particles is interpreted as an equivalent nonlinear viscous damping based on multiphase flow theory of gas-particle. Then the contribution of particle damper is estimated as an equivalent mass-damper system. And the acousti...