Bolt connection cylindrical shell structure frequency response function uncertainty analysis method with flange

Abstract

The invention belongs to the technical field of mechanical dynamics, and particularly relates to a bolt connection cylindrical shell structure frequency response function uncertainty analysis method with a flange. According to the method, eight-node degradation shell unit is adopted, and a kinetic model of bolt connection flange-cylindrical shell is established through a finite element method; bolt connection is simulated through discretizing modeling by using a spring unit, and the effectiveness of the built model is verified through a modal test; the uncertainty of the bolt connection stiffness is considered, the frequency response function interval range when the connection stiffness in five directions under a cylindrical coordinate system is an uncertainty parameter is solved based ona Chebyshev polynomial agent model and an interval analysis method, and under the deterministic inherent frequency, the Monte-Carlo sampling method is used for solving the frequency response functioninterval range, and the solving precision and efficiency of the two methods are compared; and finally, the multi-parameter uncertainty system frequency response function interval range is solved.

Description

technical field [0001] The invention belongs to the technical field of mechanical dynamics, in particular to a method for analyzing the uncertainty of the frequency response function of a cylindrical shell structure with a bolt connection and a flange. Background technique [0002] Due to the advantages of high structural strength, high rigidity and light weight, cylindrical shells have been widely used in aerospace, ocean engineering, pipelines, large dams and cooling towers. In practical engineering, cylindrical shells are generally connected by bolts, but there are many sources of uncertainty in the bolted connection structure, which makes its dynamic characteristics more complex. Therefore, the research on the uncertainty of bolted connections is of great significance. Among them, the pretightening force of the bolts, the manufacturing error of the contact surface and the loosening of the bolts are all sources of uncertainty, which ultimately lead to uncertainty in the c...

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Problems solved by technology

[0005] Based on the above literature, it can be seen that there are many studies on the deterministic dynamics of cylindrical shells, only a few literatures have carried out uncertainty research on it based on the probability method, and few literatures have used the interval analysis method to study the uncertainty of the vibration characteristics of cylindrical shells. Research

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