Humans learn to make reaching movements in novel dynamic environments by acquiring an internal motor model of their limb dynamics. Here, the authors investigated how 4- to 11-year-old children (N = 39) and adults (N = 7) adapted to changes in arm dynamics, and they examined whether those data support the view that the human brain acquires inverse dynamics models (IDM) during development. While ...

In built-up structures, one of the effective ways of dissipating unwanted vibration is to exploit the occurrence of slip at the interfaces of structural laminates. The present work focuses on the dynamic analysis of welded structures. A mathematical formulation has been developed for the mechanism of slip damping in layered and welded mild steel beams with unequal thickness subjected to both pe...

Annulus pipe conveying fluids have many practical applications, such as hydraulic control lines and aircraft fuel lines. In some these tubes are exposed to high speeds. Normally, this leads a vibration effect which may be of catastrophic nature. The phenomenon is not only driven by the centrifugal forces, but an important role played also Coriolis forces. Many theoretical approaches exist for s...

To evaluate the earth seismic response due to earthquake effects, ground response analyses are used to predict ground surface motions for development of design response spectra, to compute dynamic stresses and strains for evaluation of liquefaction hazards, and to determine the earthquake induced forces that can lead to instability of earth and earth-retaining structures. Most of the analytical...

We present new results on oscillations of the K1.5 III giant Arcturus (αBoo), from analysis of just over 2.5 yr of precise photometric observations made by the Solar Mass Ejection Imager (SMEI) on board the Coriolis satellite. A strong mode of oscillation is uncovered by the analysis, having frequency 3.47 ± 0.03 μHz. By fitting its mode peak, we are able offer a highly constrained direct estim...

The paper considers the influence of external forces, which can act anywhere on the body of the manipulator, on the behavior of the manipulator. For these forces the equivalent generalized forces in the task space and in the null space were defined. Next, a compliant motion controller is proposed, which ensures stiff behavior in the task space and compliant behavior in the null space. Two guide...

Yaw damper represents a major source of excitation for flexural vibration of the railway carbody. In order to reduce transmissibility of such undesired excitation, yaw damper should allow for large force transmission at low working frequencies, but should behave as vibration isolator at high working frequencies. Unfortunately, the yaw oil damper (OD), which is nowadays in service, has poor intr...

Dynamics of motions on long spatial scales, that are strongly affected by rotation and stratification, is in first approximation described by the balance of buoyancy and Coriolis forces. In this regime, the dynamics is nearly two dimensional and energy flows from short to large scales. In contrast, the regime of weak stratification and rotation is dominated by viscosity and advection, and the f...

Defining the four vectors n and τ of Abramowicz’s covariant formalism of inertial forces, in terms of the lapse function α, shift vector β, the metric γij and the velocity 3-vector V , we derive the components of centrifugal and Coriolis accelerations acting on a fluid element with four velocity U. We show that while for purely radial flow the centrifugal acceleration component is zero in stati...

Where r is robot, s is subject, p is robot joint angles, q is subject joint angles, I is an inertial matrix, G is a coriolis-centripetal matrix, and E and C are forces actively generated by the robot and subject respectively. Fhandle is a coupling term that represents the force that the robot and subject apply to each other. The active subject torques, called the controller, are governed by bot...