SELECTION OF SCREEN BOX STIFFNESS USING FEM TO AVOID RESONANT MODES
DOI:
https://doi.org/10.34185/1991-7848.itmm.2026.01.012Keywords:
vibrating screen, natural frequency, local resonance, stiffness, reliability, screen boxAbstract
The paper addresses the problem of selecting the stiffness characteristics of a vibrating screen box using the finite element method (FEM). A modal analysis of the screen box metal structure was carried out to determine natural frequencies and mode shapes, which made it possible to identify critical zones associated with local resonance occurrence. It was established that insufficient stiffness of individual structural elements of the screen box leads to increased stresses and reduced reliability of bolted joints. Structural measures aimed at modifying the natural frequency spectrum of the screen working body are proposed, including the introduction of additional stiffening beams and changes in their arrangement. A comparative analysis of the proposed technical solutions was performed, which made it possible to substantiate a rational design in the form of cross-bracing of the screen box. The obtained results can be used in the design and modernization of vibrating screens to improve their reliability and energy efficiency.
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