There will be presented a model of a passive magnetic bearing. The model uses the ring with molecular current as a source of external magnetic field (the unmovable magnet mounts in a case of machine). The next ring with molecular current moves in external field generated by unmovable ring (the magnet connects with the shaft of machine). The density of magnetic field is obtained from the Biota-S...

This article deals with the analysis of effects passive control on complex dynamics a nonlinear damping gyroscope. After modeling gyroscope under influence force, using harmonic balance method, amplitudes oscillations are determined. Subsequently, Routh–Hurwitz criterion is used to analyze and determine stability domains oscillations. The force parameters amplitude studied. chaotic coexistence ...

Abstract In this paper a broadband active shunt technique for controlling vibration in piezoelectric laminated structures is proposed. The effect of the negative capacitance controller is studied theoretically and then validated experimentally on a piezoelectric laminated simply supported plate. The ‘negative capacitance controller’ is similar in nature to passive shunt damping techniques, as a...

Among the passive control techniques for vibration attenuation in composite structures demonstrated in the last decades, the use of viscoelastic material as a damping core in laminated beam like components is an interesting possibility but has not yet received sufficient attention so far. In order to gain an insight into this interest and develop more accurate and efficient viscoelastic-based v...

This paper addresses an on-off adaptive damping isolation, in which the can be frequency dependent. The comparison with passive isolation is illustrated by trade off performance curve, shown relation between displacement and force transmissibility. control based on dampings a switching frequency. analytical optimization of law obtained. optimized showed remarkable improvement comparing one. At ...

Although the incidence of floor vibration problems appears to be on the rise, the use of mechanical damping devices to control vibrations is limited. In a recent survey of vibration control methods, Murray reports that passive-mechanical damping methods, including viscous damping, visco-elastic damping, and tuned-mass dampers, have often gone untried outside the laboratory or have had marginal ...