Bolt connection joint surface stiffness identification method considering uncertainty

Abstract

The invention relates to a bolt connection joint surface stiffness identification method considering the uncertainty. The method comprises the following steps of S1, building a finite element model ofa bolt connection structure according to geometrical parameters and material parameters of a connected piece and a bolt connecting piece; S2, carrying out a modal test on bolt connection structures under different pre-tightening torques to obtain structural interval uncertainty modal parameters, namely, obtaining a test mode parameter interval; S3, on the basis of the finite element model of thebolt connection structure, building a response surface model between material parameters of a thin-layer unit and dynamic characteristics of the structure; S4, in combination with the response surfacemodel and a Monte Carlo method, obtaining a calculation mode parameter interval; and S5, building an objective function according to the test mode parameter interval and the calculation mode parameter interval, identifying an interval of the material parameters of the thin-layer unit of a joint surface, and realizing an equivalent finite element model of the bolt connection structure of the thin-layer unit. The problem of the uncertainty of the joint surface stiffness in numerical simulation of the bolt connection structure in engineering is solved.

Description

technical field [0001] The invention relates to a method for identifying the stiffness of the joint surface of a bolt connection considering uncertainty, in particular to the bolt connection modeling process of the finite element dynamic connection modeling, that is, factors such as the relaxation of the pre-tightening torque and the roughness of the joint surface during the bolt work Finite element simulation of the resulting uncertainty in connection stiffness. Background technique [0002] Bolt connection is widely used in various mechanical structures, and mainly plays the role of transmitting force and motion between structural components. The stiffness performance of the contact surface is related to the dynamic characteristics of the structure. The essential. [0003] The calculation and design of bolts in engineering are often analyzed according to existing specifications and from a deterministic point of view; however, many factors such as bolt pretightening force,...

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Problems solved by technology

[0007] The invention provides a method for identifying the stiffness of the joint surface of a bolted connection considering uncertainty, which solves the problem of the uncertainty of the stiffness of the joint surface in the numerical simulation of the bolted connection structure in engineering

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