A base-isolation system was developed for earthquake protection of low-rise structures. The system incorporates spherical supports for the base, a specially designed spring-cam system to keep the base supported under normal conditions, and moves for the duration of the earthquake under the constraint of a spring with optimized stiffness characteristics. The dynamic behaviour of a three-story co...

OBJECTIVE To investigate the effects of external ankle support (EAS) on lower extremity joint mechanics and vertical ground-reaction forces (VGRF) during drop landings. DESIGN A 1 x 3 repeated-measures, crossover design. SETTING Biomechanics research laboratory. PATIENTS 13 male recreationally active basketball players (age 22.3 +/- 2.2 y, height 177.5 +/- 7.5 cm, mass 72.2 +/- 11.4 kg) f...

The effort to reduce costs and environmental impact of modern commercial aircraft requires an ever better understanding physics, including the characterisation effective damping introduced on a structure by slosh dynamics. In this paper experimental vertical sloshing dissipative behaviour rectangular tank, representative scaled wing is addressed. Specifically, controlled electrodynamic shaker e...

The focus of the present paper is on the development of a finite element formulation to investigate the sloshing of liquids in partially filled rigid rectangular tanks undergoing base excitation. The liquid domain is discretized into two-dimensional four-node rectangular elements with the liquid velocity potential representing the nodal degrees of freedom. Liquid sloshing effects induced by bot...

In recent years, the nonlinear 3D magnetohydrodynamic codes JOREK, M3D-C$^1$ and NIMROD developed capability of modelling realistic vertical displacement events (VDEs) including resistive walls. this paper, a comprehensive VDE benchmark is presented between these state art codes. The simulated case based on an experimental NSTX plasma but with simplified rectangular wall. spite pronounced diffe...

Individuals jump higher when they adopt an external focus of attention, relative to an internal focus or no focus of attention (G. Wulf, T. Zachry, C. Granados, & J. S. Dufek, 2007). In the present study, the authors determined the underlying cause of this effect. Participants performed a vertical jump-and-reach task for (a) an external focus condition (i.e., participants focused on the rungs o...

Static force transmission at the knee is analysed using measurements from radiographs showing the position of the line of body weight and also the bones of the knee in their correct orientation during function. With this technique it is possible to suggest values for a variety of forces acting at the knee. During function the degree of knee flexion is not as important as the angle that the thig...

This paper presents the design and multivariable feedback control of a compact precision positioner. The moving stage that has a total mass of 1.52 kg can generate all 6-axis motions with a single frame. Aerostatic bearings levitate the positioner and three 3-phase synchronous permanent-magnet planar motors (SPMPMs) generate electromagnetic forces over the concentrated-field permanent-magnet ma...

In clinical gait analysis, ground reaction force (GRF) is the gait parameter which can validate the state of disorder of the patient's movement. The purpose of this study was to explore the possibilities of employing the GRF derived from kinematics of the center of gravity (COG) in the study of dynamics of human gait. Gait data was collected for healthy able-bodied men and women and patients af...