Mathematical modeling and experimental research represented in this paper is aimed at dynamic force analysis of circuit cards order to eliminate or reduce stress deflection an acceptable level provide strength reliability design card assemblies subjected vibration. In conditions when viscous friction forces are negligible dampers, such as liquid cannot be used reduction oscillation amplitude cr...

The grand piano action has been developped empirically and provides a remarkably accurate control of the hammer velocity and the impact time [1]. The numerical simulation of the action is necessary to improve numerical keyboards and to better understand haptic controllability. Following previous efforts [2, 3], we propose a simulation based on an explicit model and a solver of non-smooth dynami...

This paper proposes a re-centering variable friction device (RVFD) for control of civil structures subjected to near-field earthquakes. The proposed hybrid device has two subcomponents. The first subcomponent of this hybrid device consists of shape memory alloy (SMA) wires that exhibit a unique hysteretic behavior and full recovery following post-transformation deformations. The second subcompo...

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...