000003705 001__ 3705
000003705 005__ 20141118153350.0
000003705 04107 $$acze
000003705 046__ $$k2013-05-13
000003705 100__ $$aZapoměl, J.
000003705 24500 $$aTHE STABILITY INVESTIGATION OF VIBRATIONS OF FLEXIBLY SUPPORTED RIGID ROTORS DAMPED BY HYBRID MAGNETORHEOLOGICAL DAMPING ELEMENTS

000003705 24630 $$n19.$$pEngineering Mechanics 2013
000003705 260__ $$bInstitute of Thermomechanics AS CR, v.v.i., Praha
000003705 506__ $$arestricted
000003705 520__ $$2eng$$aA usual technological solution how to reduce the time varying forces transmitted between the rotor and its casing consists in application of a flexible suspension and in adding the damping devices to the constraint elements. To achieve their optimum performance their damping effect must be controllable. For this purpose a concept of a hybrid damping device working on the principle of squeezing the layers of normal and magnetorheological oils have been developed. Here in this paper, there is investigated influence of the proposed damping element on stability of the rotor vibrations induced by its imbalance during the steady state operating regimes. The stability is evaluated by two approaches: by utilization of a transition matrix and the Floquet theorem and by the evolutive method. The former determines the stability by means of magnitude of the largest eigenvalue of the transition matrix set up over the span of time of one period, the later by time evaluation of eigenvalues of the system linearized in a small neighbourhood of the steady state phase trajectory of the rotor during one period and calculation of the corresponding damping ratio or logarithmic decrement.

000003705 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000003705 653__ $$arigid rotors, controllable damping, hybrid magnetorheological dampers, vibration stability, Floquet theorem, evolutive method

000003705 7112_ $$aEngineering Mechanics 2013$$cSvratka (CZ)$$d2013-05-13 / 2013-05-16$$gEM2013
000003705 720__ $$aZapoměl, J.$$iFerfecki, P.$$iKozánek, J.
000003705 8560_ $$ffischerc@itam.cas.cz
000003705 8564_ $$s288441$$uhttps://invenio.itam.cas.cz/record/3705/files/115_Zapomel_J-FT.pdf$$y
             Original version of the author's contribution as presented on CD, DYN.
            
000003705 962__ $$r3632
000003705 980__ $$aPAPER