Abstract This research work proposes an equivalent approach modelling the peculiar hysteretic behavior of passive variable friction damper, for engineers who call a simplified way to simulate such damper in anti-earthquake engineering practice with acceptable accuracy. models special nonlinear via paralleling 3 basic link elements that commonly built-in commercially available structural analysi...

Purpose The supercritical design of tail rotor drive shaft has attracted more attention in helicopter due to its high power–weight ratio and low maintenance cost. However, there exists excessive vibration when the passes through critical frequency. Dry friction damper is equipment applied suppress vibration. In order figure out damping mechanism dry improve efficiency, dynamic model shaft/dampe...

A variation of a hanging pendulum thrust stand capable of measuring the performance of an electric thruster operating in the vertical orientation is presented. The vertical orientation of the thruster dictates that the thruster must be horizontally offset from the pendulum pivot arm, necessitating the use of a counterweight system to provide a neutrally stable system. Motion of the pendulum arm...

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...

Semi-active control devices have been shown to be more energy efficient than active devices and more effective in reducing seismic structural vibration than passive devices. A new type of semi-active control device, the piezoelectric friction damper has been made in this paper. Piezoelectric actuators used in the dampers can quickly and accurately respond to a voltage signal. They are also effe...

A particle impact damper (PID) dissipates the vibration energy of a structure through impacts within damper. The PID is not commonly used in practice mainly because its low damping-to-mass ratio and difficulty achieving optimal design due to nonlinear characteristics. In contrast, Coulomb friction (FD) can offer higher damping force-to-mass than other dampers, but it also difficult be controlle...

This paper investigates the effect of span cantilevered RC wall, in-plane stiffness roof, layout friction damper support on both response control walls in gymnasiums with metal spatial roofs and proposed evaluation method. According to history analysis results, method was proved be available various formula column base moment modified following appropriate diagram.