Bolt connection model interface parameter identification method

Abstract

The invention belongs to the technical field of dynamic analysis of connection structures, and particularly relates to a bolt connection model interface parameter identification method. The method comprises the following steps: S1, through a quasi-static experiment on a tangential interface of a bolt connection structure, obtaining experimental data used for constructing an objective function and calculating an initial value of a tangential parameter; S2, constructing an objective function according to the experimental data in the step S1 and theoretical data in a pre-constructed theoretical model, and calculating an initial value of a tangential parameter; s3, optimizing the constructed objective function according to the initial value of the tangential parameter, and obtaining an identification result of the tangential parameter; s4, through a quasi-static experiment on a normal interface of the bolt connection structure, obtaining experimental data for linear fitting; and S5, carrying out linear fitting according to the experimental data in the step S4, and obtaining a normal parameter identification result. By means of the method, dynamic analysis of the bolt connection assembly body is well achieved.

Description

technical field [0001] The invention belongs to the technical field of dynamic analysis of connection structures, in particular to a method for identifying interface parameters of a bolted connection model. Background technique [0002] In the engineering assembly structure, it is often accompanied by the use of mechanical connections. The common connection forms include bolt connection, riveting, tie rod connection, interference fit and so on. Among them, the bolted connection structure has many advantages such as easy processing, easy disassembly, high bearing capacity, and good reliability, so it is widely used in engineering applications of assembly structures, such as the connection structure of the drum and casing of the aero-engine. The existence of bolted connections affects the continuity of the assembled structure, causes nonlinear changes in local stiffness, and is also an important source of damping in the assembled structure. When subjected to complex external ...

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Problems solved by technology

These models ignore the nonlinear characteristics of the bolted connection itself, which is obviously not accurate enough; another common approach is to use the finite element method to model the connection parts, and the friction between the connection interfaces is often considered in the model Behavior can accurately reflect the nonlinear characteristics of bolted connections, but often involves a large number of degrees of freedom and low computational efficiency

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