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Abstract

A systematic approach for analyzing the static and dynamic electromechanical response of electrostatic actuators is presented. The analysis is based on energy methods. An analysis approach for extracting dynamic response parameters of electrostatic actuators, while only considering static states of the system, is presented. This is an efficient method for extracting the dynamic pull-in parameters because it does not require time integration of momentum equations.
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Abstract

The author believes that one all-inclusive assessment of Marx’s philosophy is inevitably misleading. Although Marx constructed one theory that has a texture of a uniform fabric, the fabric has been woven with threads of two very different qualities. His presentation of capitalist instability, exploitation and alienation has the quality of scientific explanations. But his treatment of dialectic, economy formulated in terms of priceless commodities and his vision of communism is fantastic and arbitrary.
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Abstract

The considerations presented in the paper relate to one of the most intriguing phenomena, which is the development of oil whirls and oil whips in rotors with journal bearings. This effect is sometimes referred to as flutter, as its origin is in some relation to self-exciting vibrations of the system. Despite the fact that the flutter has been an object of investigation in numerous research centres all over the world, its nature has not been sufficiently recognized yet. The present paper delivers a description of particular phases of development of the hydrodynamic instability and proposes diagnostic determinants for this state. The object of investigations also included bearings with hybrid lubrication and siphon pockets in the oil gaps. The answer has been received to the question whether the self-exciting vibrations in rotating machines can be avoided, or reduced by means of additional oil supply having the form of siphon oil.
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