Sensitivity Analysis of the Dynamical Characteristics of a Core Barrel to the Compressive Spring Parameters
Abstract: ANSYS was applied to establish the model of a core barrel of nuclear reactors in air, and dynamical characteristics were calculated. The influences of the compressive spring stiffness on the dynamical characteristics of the core barrel were mainly concerned. The results show that the bending stiff-ness and torsional stiffness of the compressive spring have obvious influence on the first-order beam and axial-deformation frequencies. These two types of frequencies increase when the stiffness of compressive spring is considered while the orders of the modal remain the same. During a certain area, with the increase of the compressive spring stiffness, the first-order beam and axi-al-deformation frequencies increase, and the changing of the compressive stiffness have little in-fluence on the shell frequencies of the structure.
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