Bolt connection model interface parameter identification method

A technology of interface parameters and recognition methods, which is applied in electrical digital data processing, CAD numerical modeling, and special data processing applications, etc., can solve problems such as low calculation efficiency, large number of degrees of freedom, and neglect of nonlinear characteristics of bolt connections. Achieve the effect of simplifying mechanical modeling

Active Publication Date: 2019-09-27
NORTHEASTERN UNIV
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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 betwe

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  • Bolt connection model interface parameter identification method
  • Bolt connection model interface parameter identification method
  • Bolt connection model interface parameter identification method

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[0071] In order to better explain the present invention and facilitate understanding, the present invention will be described in detail below in conjunction with the accompanying drawings and through specific embodiments.

[0072] The invention discloses a bolt connection model interface parameter identification method, which comprises the following steps,

[0073] S1: Obtain the experimental data used to construct the objective function and calculate the initial value of the tangential parameters through quasi-static experiments on the tangential interface of the bolted connection structure;

[0074] S2: Construct the objective function according to the experimental data of S1 and the theoretical data in the pre-built theoretical model, and calculate the initial value of the tangential parameter;

[0075] S3: Optimize the constructed objective function according to the initial value of the tangential parameter, and obtain the result of tangential parameter identification;

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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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Application Information

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IPC IPC(8): G06F17/50G01M13/00
CPCG01M13/00G06F30/17G06F2111/10G06F2119/06Y02T90/00
Inventor 李朝峰乔瑞环唐千升李培勇张子健
Owner NORTHEASTERN UNIV
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