The aim of this study is to investigate the performance isolated structures by considering possibility impact under severe earthquakes. In design structures, required displacement capacity determined based on considered earthquake hazard level. However, there a an caused moat walls or adjacent Dampers are used in improve structural and nonstructural components. regard, three (6, 9, 12 stories) ...

Many of the physical phenomena, like friction, backlash, drag, and etc., which appear in mechanical systems are inherently nonlinear and have destructive effects on the control systems behavior. Generally, they are modeled by hard nonlinearities. In this paper, two different methods are proposed to cope with the effects of hard nonlinearities which exist in friction various models. Simple inver...

The variation of the monomeric friction coefficient of styrene butadiene copolymer (SBR) and natural rubber (NR) with various degrees of cure was analyzed. Samples with different levels of cure were prepared. Loss tangent measurements of the samples were performed by means of a damped torsion pendulum between 173 K and 373 K. Data were analyzed in the frame of the Kloczkowsky, Mark and Frisch m...

In attempts to better understand the etiology of osteoarthritis, a debilitating joint disease that results in the degeneration of articular cartilage (AC) in synovial joints, researchers have focused on joint tribology, the study of joint friction, lubrication, and wear. Several different approaches have been used to investigate the frictional properties of articular cartilage. In this study, w...

In this paper, two feedback linearizing control laws for the stabilization of the Inertia Wheel Pendulum are derived: a full-state linearizing controller, generalizing the existing results in literature, with friction ignored in the description and an inputoutput linearizing control law, based on a physically motivated definition of the system output. Experiments are carried out on a laboratory...

In the last 50 years several studies have been made to understand the relaxation mechanisms of the heavy interstitial atoms present in transition metals and their alloys. Internal friction measurements have been carried out in a Nb–Ti alloy containing 3.1 at.% of Ti produced by the Materials Department of Chemical Engineering Faculty of Lorena (Brazil), with several quantities of oxygen in soli...

Base isolators and fluid viscous dampers are viable protective devices that have been commonly considered in the seismic protection of civil engineering structures. However, optimal design these remains a tedious iterative undertaking due to uncertainty ground motions, nonlinear behavior structure, its change dynamic characteristics (i.e., effective stiffness damping ratio) under each new desig...

The effectiveness of Double Concave Curved Surface Sliders (DCCSS), which initially spread under the name Friction Pendulum (DFP) isolators, was already widely proven by numerous experimental campaigns carried out worldwide. However, many aspects concerning their dynamical behavior still need to be clarified and some details require improvement optimization. In particular, due boundary geometri...

The robust stabilization of the cart pendulum system was studied under structured uncertainty with a continuous-time periodic controller. The cart pendulum system was considered here as the test set-up as it is a wellknown example of an unstable nonminimum phase system. The uncertainty in the system rose due to measurement error or dry friction in it. In this paper, the robust stability of the ...

This article describes a set of experiences in modeling dynamic systems using Genetic Programming and Gene Expression Programming. We have made experiments in linear systems, non-linear systems and times series. The experiments in linear systems include linear pendulum, coupled mass-spring, electrical circuits, etc. In non-linear systems we have modeled the Van der Pol Equation, non-linear pend...