The future power system integrated a large share of distributed generation (DG) may causes a reduction of the system rotational inertia, resulting in high frequency variations with any disturbances. An additional rotational inertia will be provided to the system if many DG units combined with relative small storage systems operate like virtual synchronous generators (VSG). This paper presents t...

We prove the existence of a compact, finite dimensional, global attractor for a coupled PDE system comprising a nonlinearly damped semilinear wave equation and a nonlinear system of thermoelastic plate equations, without any mechanical (viscous or structural) dissipation in the plate component. The plate dynamics is modelled following Berger’s approach; we investigate both cases when rotational...

This paper summarizes the mechanical and control design concepts of an inverted or unstable pendulum where stabilization is achieved by a moment exchange generated by a controlled symmetric rotation of a rotational inertia attached to the pendulum. The proposed design of the pendulum has a fixed bottom rotation or point of support as opposed to the usual vertically or horizontally moving point ...

In 2004 Kim and Chan performed a torsional oscillator measurement of the rotational inertia of solid helium-4. They found frequency changes which were interpreted in terms of a non-classical rotational inertia, that is a partial superfluidity or “supersolidity” of solid helium-4. Since then there have been many further studies using various versions of this technique. One important question tha...

Successful use of a hand-held tool requires overcoming the rotational inertia of the hand-plus-tool system. Where an object is grasped affects this rotational inertia. Appropriate choice of grip position may be crucial in the safe, effective, and efficient control of a hand-held tool. In 3 experiments, the authors investigated how choice of grip position on a tool was constrained by task demand...

The rotational band structure of the Z=104 nucleus (256)Rf has been observed up to a tentative spin of 20ℏ using state-of-the-art γ-ray spectroscopic techniques. This represents the first such measurement in a superheavy nucleus whose stability is entirely derived from the shell-correction energy. The observed rotational properties are compared to those of neighboring nuclei and it is shown tha...

This study investigates preschoolers’ ability to perceive the heaviness of objects by dynamic touch, a perceptual system that relies on the use of the muscle as a sensory organ. In total, 18 preschoolers were asked to hold objects by a handle without being able to see them. The 9 objects differed in mass and volume, allowing us to test the size–weight illusion by dynamic touch. Children were as...

The Finite Element (FE) method has been used to study full-scale oblique impacts of a motorcycle helmet. For these impacts, an elaborate FE model of the human body was employed. The results were compared to the results of the same impacts but by using the detached head of the body. It has been found that the presence of the body influences the head rotational acceleration components (up to 40% ...

In many applications, such as structural testing or vehicle collision studies, rotational data are required. Modal analysis will mainly use it to identify rotational degrees of freedom (DOFs), where crash testing will mainly look into rotational inertia. Measuring rotational acceleration can be done by computing measurements from linear sensors, but this leads inevitably to an increase in measu...

Context. Vesta is the second largest body of the main asteroid belt, and it has been studied recently in great detail by the Dawn mission. It was the first time that this asteroid, or protoplanet, has been explored by a space mission, and it revealed a differentiated body. The knowledge of the rotational motion and, especially, its precession-nutation and length-of-day variations may add precio...