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Structural dynamical model modification-based prestress recognition method

A dynamic model and identification method technology, applied in special data processing applications, instruments, electrical digital data processing, etc., to achieve the effects of convenient operation, simple identification method, and high identification accuracy

Inactive Publication Date: 2016-07-06
XIAMEN UNIV
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Problems solved by technology

However, the boundary conditions of the structure will have a certain impact on the identification of the axial force, so the impact of boundary constraints must also be considered during the identification process

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  • Structural dynamical model modification-based prestress recognition method
  • Structural dynamical model modification-based prestress recognition method
  • Structural dynamical model modification-based prestress recognition method

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Embodiment Construction

[0031] The specific implementation steps of prestress identification include:

[0032] 1. Transformation of boundary conditions. exist figure 1 In the example shown, it shows that the fixed support boundary of a beam structure is transformed into three directions K x 、K y 、K t spring support.

[0033] 2. Using commercial finite element software Patran and Nastran to establish the finite element model of the beam structure. The length of the prestressed beam is 1m, the cross section is a rectangle of 0.02m×0.03m, the material is steel, the modulus of elasticity is 210GPa, and the density is 7800kg / m 3 , Poisson's ratio is 0.3, divided into 20 units. The right end is subjected to a prestress of size P, and the spring stiffness and initial values ​​of the prestress on the left are shown in Table 1. exist figure 2 In the example shown, it means that the beam structure is divided into finite element meshes.

[0034] 3. Through the commercial finite element software Nastra...

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Abstract

The invention discloses a structural dynamical model modification-based prestress recognition method, and relates to the prestress recognition of pre-tensioning structures. The method comprises the following steps: establishing a finite element model of a structure; converting the boundary condition such as clamped support or simple support into spring support in three or two directions, and applying an axial prestress at the same time; calculating a fixed frequency and a fixed vibration mode of the structure through commercial finite element software; carrying out test and recognition by utilizing a test modal analysis technology, so as to obtain the fixed frequency and the fixed vibration mode of the structure; and recognizing the spring support rigidity and prestress of the boundary at the same time on the basis of a model modification technology. The method is simple, high in recognition precision and convenient to operate; and through considering the influences of the boundary condition, the reliability is high. By taking MAC as a target function, the completeness of the test data is supplemented; the optimization through a genetic algorithm is more beneficial for obtaining the globally optimal solution; and the whole modification model can be automatically driven to carry out solving.

Description

technical field [0001] The invention relates to prestress recognition of pretension structures, in particular to a prestress recognition method based on structural dynamics model correction. Background technique [0002] In aerospace, mechanical engineering, civil engineering, and weaponry systems, pretensioned structures exist widely, such as bolted connections, frame structures, prestressed bridges, and so on. In these preloaded structures, the axial load needs to be identified. Although experimental techniques have been greatly developed, in most practical engineering structures, the direct experimental measurement of external loads is not so simple. The natural frequency of the prestressed structure will change with the change of the axial prestress, which is the so-called stress intensification effect. Therefore, by testing the dynamic characteristics of the structure, it is possible and effective to obtain the load distribution based on the inverse problem method. H...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 张保强杨婧陈庆苏国强袁修开
Owner XIAMEN UNIV
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