Analysis and Design of Suspension and Exciting Systems of Vibration Fluidized Bed and It's Dynamic Simulation.

In this study, the process of the design of the suspension system of Vibration fluidized bed belonging to Esfahan milk factory is reported. For that purpose, the springs were designed first. To do so, firstly the problem of the coupling of the system vibrating co-ordinations was dealt with. Then choosing the appropriate co-ordinations which make no coupling, a method for the determination of the stiffness of the needed springs for that machine and all the similar machines was obtained. By determining the stiffness of the needed springs and also calculating other mechanical characteristics and force analysis, the design of the springs was over. Then the theoretical analysis of vibrations and dynamics of the machine was done. For this purpose, firstly the machine was modeled as a system with 3 degrees of freedom and then as a system with 6 degrees of freedom. In the 3DOF model, the free and forced vibrations of the machine were observed, and also using the vibration isolation and transmissibility and the conservation of mass and linear and angular momentum, the amount of the force on the foundation of the machine and the force imposed on the powder in the vibrating process were calculated. In the 6DOF model, natural frequencies and the vibrating modes shapes of the machine and also the simplified model were calculated. To complete the project, the above mentioned dynamic system was modeled in 2 dynamic softwares: Working Model and Visual Nastran. The results taken from modeling in Working Model were calculated and classified according to the vibration in and around the chosen co-ordination axis. In Visual Nastran the natural frequencies of the machine were modeled and the shapes of the related modes were calculated. The results of these modelings were compared with those of the theoretical calculations and the good agreement of the results could explain their usefulness. Finally, after the manufacturing the machine and doing the related vibrational tests, the acceleration in different points of the machine in the directions of co-ordination axis were measured and with slight deviations matched the theoretical results. Key Words: Vibration Fluidized Bed, Dynamic Simulation, Suspension System, Vibration Isolation.