As building structures frequently collapse and cause losses of lives and properties, due to excessive vibrations induced during earthquake periods, it is crucial to reduce the structural vibrations. This paper develops a Lyapunov-based controller for Magnetorheological (MR) dampers embedded in building structures to mitigate quake-induced vibrations. In this work, MR dampers are used as semi-ac...

This paper deals with the numerical computation of the structural and acoustic response of a building to an incoming wave field generated by high-speed railway traffic at grade. The source model consists of the model of a moving vehicle on a longitudinally invariant domain coupled to a boundary element model of the underlying ground. The receiver model is based on a substructuring formulation a...

Abstract Train-induced structural vibration caused more and attentions nowadays, the present paper developed a numerical approach of train-induced simulation with ANSYS software. The finite element model is composed by buildings, rail, sleepers, ballast several layers soil, moving load represented wheel-rail coupling forces, both solid element, shell beam are used in model. Acceleration time hi...

Large structures, like manipulators for assembling the space station, are lightweight, and hence flexible. The structural flexibility results in significant elastic vibrations that are caused not only by exogenous perturbations but are also caused by maneuvers like slewing. For example, the Mobile Transporter Unit in the Space Station carries a flexible manipulator with payloads from one part o...

Small-amplitude fast vibrations and small surface micropatterns affect properties of various systems involving wetting, such as superhydrophobic surfaces and membranes. We review a mathematical method of averaging the effect of small spatial and temporal patterns. For small fast vibrations, this method is known as the method of separation of motions. The vibrations are substituted by effective ...

In order to reduce the impact of noise on environment and dissipation useless energy traction motors, this study analyzed a motor by detecting vibration acceleration suspension frame. Field tests were conducted measure frame in commercially operational medium- low-speed maglev train. The showed that as train accelerates, sound pressure grows overall, but increase becomes smaller at each test sp...

Floor vibrations induced by human walking were investigated in a reinforced concrete structure. Six experimental floor structures were built in laboratories with the same dimensions and boundary conditions. Subjective tests were performed to assess the vibration serviceability of the floor structures. First, the subjects were asked to walk across a floor and then to rate the intensity of the vi...

Engineers, architects, planners and designers must carefully consider the effects of wind in their work. Due to slender flexible nature, long-span bridges can often experience vibrations due wind, so careful analysis is paramount. Traditionally, tunnel tests have been preferred method conducting bridge analysis. In recent times, owing improved computational power, fluid dynamics simulations are...

First we present and theoretically analyze the phenomenological physical picture behind Vibration-Induced Conductivity Fluctuations. We identify the relevant tensors characterizing the electromechanical response against the vibrations for both longitudinal and transversal responses. We analyze the conductivity response with acceleration type vibrations and a new scheme, measurements with more a...