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Lateral-torsional vibration analysis of the rotor-shaftbearing system using various mechanical models

100%

Kiciński J. , Rządkowski R. , Szolc T. , Walczyk Z.

Vibrations in Physical Systems

2002

tom Vol. 20

180--181

Srovnání dvou přístupů pro výpočet příčného kmitání rotoru s uvážením rázů kotoučů na stacionární část data

100%

Obruča Z.

Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska

2002

tom z. 19

113-118

This contribution deals with analysis of lateral vibration of a rotor taking into account impacts of the discs on the stationary part. The shaft was represented by a beam-like body that was discretized into finite elements. For solving the equation of motion an implicit Newmark method has been chosen and modified for the purpose of the calculation. In the paper there are compared two approaches to incorporation of components of the contact force into the equation of motion.

Modeling and Analysis of Lateral Vibrations of the Forest Crane Boom

84%

Cekus D. , Posiadała B. , Waryś P.

Machine Dynamics Research

2010

tom Vol. 34, No. 3

38-46

In this paper the analysis of vibrations on the basis of two computational models of the crane: the simulating model, worked out with help of the finite elements method (FEM) and the modal model which is the result of the experimental modal analysis conducted on the real object have been presented. The carried out research concern the vibrations of the system in the lifting and rotary plane of the boom. Researchers have been performed by fixed configuration of the system, reflecting the crane position while the load is picked from the foundation. Frequencies and the mode shapes obtained from simulating research have been compared with the results of the experimental modal analysis. The simulation FEM model represents properly the dynamical properties of the real forest crane and it can be used to investigate the dynamic behaviour of the real object in any other than presented in the work cases of working configurations.

Active vibration reduction of rigid rotor supported by journal bearings

84%

Ondrouch J. , Ferfecki P. , Poruba Z.

Modelling and Optimization of Physical Systems

2009

tom z. 8

85--90

The contribution describes the possibilities of active reduction of lateral vibration of symmetric, rigid rotor supported by journal bearings on the base of computational modelling. The efficiency of the feedback P, PD and PID controllers in stable revolution area is examined. To do it the linearized rotor system model is used. The results of the theoretical analysis will be used for the testing stand where the bearing shells motions are controlled by the piezoelectric actuators connected with controllers.

Článek se zabývá možnostmi aktivního snížení příčného kmitání symetrického, dokonale tuhého rotoru uloženého na hydrodynamických ložiskách, na základě počítačového modelování. Je zkoumána účinnost zpětné vazby s regulátory P, PD a PID ve stabilní otáčkové oblasti. Κ tomu je využit linearizovaný model rotorové soustavy. Výsledky teoretické analýzy budou využily u zkušebního stavu, u kterého jsou pohyby ložiskových pouzder ovládány pomocí piezoaktuátorů napojených na regulátory.