An Analysis Method for Vibration Induced by Random Turbulence Excitation of Cylindrical Structure

Abstract

The invention discloses a method for analyzing the vibration induced by random turbulent excitation of a cylindrical structure, comprising: obtaining flow field parameters of fluid distributed on the surface of a cylindrical shell; determining a spatial correlation function of the cylindrical structure; function, calculate the power spectral density of the random turbulent excitation force acting on the surface of the cylindrical structure; obtain the time history of the random turbulent excitation force acting on the surface of the cylindrical structure; convert the time history of the random turbulent excitation force in each discrete area on the surface of the cylindrical structure to the frequency domain; calculate the coherence coefficient between the time-history curves of the random turbulent excitation force corresponding to each discrete area on the surface of the cylindrical structure, and verify the coherence between the time-history of each group of random turbulent excitation forces; The excitation force time history is applied to the cylindrical structure, and the random turbulent excitation-induced vibration response of the cylindrical structure is calculated, which provides a more accurate general method for the calculation of the random turbulent excitation-induced vibration of the cylindrical structure.

Description

technical field [0001] The invention relates to the field of reactor structure mechanics, in particular to an analysis method for random turbulent excitation vibration of cylindrical structures such as a gondola structure in a reactor. Background technique [0002] In the reactor structure, the mechanisms that induce flow-induced vibration mainly include turbulent excitation, stray bomb instability, vortex detachment and acoustic resonance. The main components involved in the flow-induced vibration analysis of reactor structures include reactor internals, steam generator heat transfer tubes, nuclear-grade piping systems for fuel assemblies, etc. Most of these structural components can be abstracted as cylindrical structures or cylindrical systems. The flow direction of the fluid relative to the structural components is divided into axial and lateral directions. The fluid may be inside or outside the structure, and may flow through annular gaps or between closely packed cylin...

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Problems solved by technology

[0007] The invention provides an analysis method for vibration induced by random turbulence excitation of a cylindrical structure, which solves the problem that the existing theoretical analysis method is heavily dependent on the test and the test measurement points are limited, and the response of any position of the structure cannot be obtained, and the fluid inside and outside the cylinder is obtained. The coupled calculation model provides a more accurate general method for the calculation of random turbulent excitation-induced vibration of cylindrical structures, and provides an analysis method for random turbulent excitation-induced vibration analysis, design improvement and safety evaluation of cylindrical equipment

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