The paper presents two methods for the formulation of free vibration analysis of collecting electrodes of precipitators. The first, called the hybrid finite element method, combines the finit element method used for calculations of spring deformations with the rigid finite element method used to reflect mass and geometrical features, which is called the hybrid finite element method. As a result, a model with a diagonal mass matrix is obtained. Due to a specific geometry of the electrodes, which are long plates of complicated shapes, the second method proposed is the strip method which is a semi-analytical method. The strip method allows us to formulate the equations of motion with a considerably smaller number of generalized coordinates. Results of numerical calculations obtained by both methods are compared with those obtained using commercial software like ANSYS and ABAQUS. Good compatibility of results is achieved.

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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.

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