Michael Ruderman

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The phase mixing of Alfvén waves in planar two-dimensional open magnetic plasma configurations is considered. It is assumed that the characteristic vertical spatial scale of the configuration is much larger than the horizontal scale, and that the latter is of the order of a wavelength. The WKB method is used to derive the governing equation for the wave(More)
A novel nonlinear friction model with elasto-plasticity is proposed. Being in accordance with state-of-the-art friction properties the model provides a compact set of concentrated parameters and offers a complexity reduction when describing the hysteretic and the transient response of dynamic friction. Considering the first-order dynamic system with(More)
The impact of additive periodic torque disturbances on the controlled motion of permanent magnet motors can be significant. The paper shows how an observer-based drive control can efficiently reject the harmonic torque disturbances providing smooth angular velocity. The proposed control design is based on the state-space torque harmonics representation and(More)