This paper presents a simple, cheap and easily accessible demonstration experiment in two modifications. A typical example of a physical system for which damping forces have to be involved into equations is a damped spring mechanical oscillator. Here we use two models of the damping force, being produced by Foucault currents and by the force of the drag in air. It turns out, maybe as a slightly...

In dynamic plowing lithography, the sample surface is indented using a vibrating tip in tapping mode atomic force microscopy. During writing, the gap between the cantilever and the sample surface is very small, usually on the order of micrometers. High vibration frequency and small distance induce squeeze film air damping from the air in the gap. This damping can cause variations in the cantile...

We discuss damping of the collective rotational motion in A ∼ 150 superdeformed nuclei by means of a shell model combining the cranked Nilsson mean-filed and the surface-delta two-body residual force. It is shown that, because of the shell structure associated with the superdeformed mean-field, onset energy of the rotational damping becomes Ex ∼ 2 − 3 MeV above yrast line, which is much higher ...

This paper extends an earlier work that achieved resonance damping of a micro-machined directional microphone by embedding it in a compensated sigma-delta modulator (Wu et al., 2004). The goal was to combat the quadratic nonlinearity in the electrostatic force. The new developments in this paper include the use of a different capacitive device that is also biased to allow more effective readout...

In this paper we explore the space of design freedoms associated with series elastic actuators. We specifically focus on the problem of damping, and evaluate through simulation how inclusion of series damping can improve the reliability and controllability of tasks involving force control and impact. We explicitly build upon the pioneering work by Pratt and colleagues at the MIT Leg Lab in the ...

We discuss damping of the collective rotational motion in A ∼ 150 superdeformed nuclei by means of a shell model combining the cranked Nilsson mean-filed and the surface-delta two-body residual force. It is shown that, because of the shell structure associated with the superdeformed mean-field, onset energy of the rotational damping becomes Ex ∼ 2− 3 MeV above yrast line, which is much higher t...

This paper proposes a novel method to test the dynamic damping characteristics of valve. The testing system employs the vertical movement pattern, and has a suspension support structure. Force sensors are installed to measure the dynamic friction of the working valve directly. Making use of LuGre friction model and both adaptive genetic algorithm and chaos particle swarm optimization algorithm,...

Linear dynamics of Euler-Bernoulli beams with non-viscous non-local damping is considered. It is assumed that the damping force at a given point in the beam depends on the past history of velocities at different points via convolution integrals over exponentially decaying kernel functions. Conventional viscous and viscoelastic damping models can be obtained as special cases of this general damp...

We numerically solve the functional differential equations (FDE’s) of 2-particle electrodynamics, using the full electrodynamic force obtained from the retarded Lienard-Wiechert potentials and the Lorentz force law. In contrast, the usual formulation uses only the Coulomb force (scalar potential), reducing the electrodynamic 2-body problem to a system of ordinary differential equations (ODE’s)....

This paper presents the utilization of inertial effect in damping-based posture control of a mobile manipulator. As a measure for redundancy resolution of a mobile manipulator, an effective inertia at the end effector in the operational space is proposed and investigated. By changing the effective inertia property via null-motion, we can get the reduced inertial property of the mobile manipulat...