Przeglądaj {{ collection }} wg Autor "Nowak, Andrzej"

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Influence of position of an anvil beam on vibrations of collecting electrodes.
(Politechnika Łódzka. Wydział Mechaniczny. Katedra Automatyki, Biomechaniki i Mechatroniki., 2015) Nowak, Andrzej; Nowak, Paweł; Awrejcewicz, Jan
The paper presents experimentally verified computational model of the collecting electrodes in electrostatic precipitator (ESP). Discretisation of the whole system, both the beams and the electrodes, is carried out by means of the modified rigid finite element method (RFEM). The RFEM allows easy to reflect mass and geometrical features of the considered. Moreover, the method is convenient for the introduction of additional concentrated masses which reflects elements such as the joints that fasten the electrodes to the suspension beam, distance-marking bushes, riveted or screw joints, etc... The system of nine electrodes 16 m long and several various positions of an anvil beam in this system are analyzed. Position of the anvil beam in the system has essential influence on tangent and normal accelerations at different points of the plates, and thus on the effectiveness of the dust removal process. The aim of the simulations is to find optimal position of an anvil beam, which guaranties the maximum amplitudes of vibrations and their proper distribution in the plates.
Vibration Analysis of Collecting Electrodes by means of the Hybrid Finite Element Method
(2014) Adamiec-Wójcik, Iwona; Awrejcewicz, Jan; Nowak, Andrzej; Wojciech, S.
The paper presents a hybrid finite element method of shell modeling in order to model collecting electrodes of electrostatic precipitators. The method uses the finite element method to reflect elastic features and the rigid finite element method in order to model mass features of the body. A model of dust removal systems of an electrostatic precipitator is presented. The system consists of two beams which are modeled by means of the rigid finite element method and a system of collecting shells modeled by means of the hybrid finite element method. The paper discusses both the procedure of deriving the equations of motion and the results of numerical simulations carried out in order to analyze vibrations of the whole system. Experimental verification of the model is also presented.