Browsing by Author "Parra Calzadilla, Francisco Ariel"

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    Fabricación de un banco de ensayos para el análisis de un modelo DEM-MBD.
    (Universidad de Concepción, 2024) Parra Calzadilla, Francisco Ariel; Moncada Merino, Manuel Alonso
    The interaction that occurs between particles and vibrating screens is of vital interest to bulk material processing industries. The kinematic behavior of the structure of these equipment’s can be evaluated through a multibody dynamic model (MBD), while the influence of the material on the equipment can be modeled using a discrete element model (DEM). However, only a coupled DEM-MBD model can capture the complex interaction that occurs between the material particles and the equipment. This work develops a one-degree-of-freedom coupled DEM-MBD model focused on vibrating screens that allows modeling the interaction force generated with the particles. A dynamic model of the system is built under the MBD modeling theory, and subsequently, this model is coupled to a DEM model using the Functional Mock-up Interface (FMI). A comprehensive experimental calibration of the physical parameters of the dynamic model and the main material and contact parameters of the DEM model is conducted to improve the numerical accuracy of the proposed model. A test bench is designed and manufactured consisting of a particle container that moves only in the vertical direction. The interaction force between particles and the container, system acceleration, and particle movement are measured. These experimental data are compared with simulated ones to evaluate the accuracy of the numerical model. A good modeling of the vibratory movement of the system is obtained, with errors of less than 6.4% when the peak vibratory amplitude of the fixed assembly does not exceed 0.0984 inch and that of the mobile assembly does not exceed 0.0787 inch. For larger vibratory amplitudes, it was identified that the test bench exhibited problems in its dynamic behavior caused by variable friction between the rolling elements of the bearings and the guide shafts. This friction resulted in an additional energy dissipation element, as well as premature wear of the shafts, leading to experimental vibratory amplitudes lower than those simulated in the cases evaluated at 17 and 20 Hz. Regarding the impact force generated by the particles, it could be measured experimentally, but the variation in damping also affected its amplitudes and the estimation of the inertia force necessary for its evaluation.
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