Truss structure damage evaluation method based on pulsation test

A truss structure and damage index technology, applied in the testing of mechanical components, testing of machine/structural components, measuring devices, etc., can solve problems such as uneconomical, structural vibration, unrealistic truss structures, etc., to save time and cost Effect

Active Publication Date: 2021-03-19
NINGBO UNIVERSITY OF TECHNOLOGY
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  • Application Information

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Problems solved by technology

[0003] Patent CN102495134B discloses a truss structure damage location method based on additional mass, using the comparison of the frequency response peak position of the bar after adding the mass to judge the position of the bar damage. Although the cost is low and the operation is simple, it often requ

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  • Truss structure damage evaluation method based on pulsation test
  • Truss structure damage evaluation method based on pulsation test
  • Truss structure damage evaluation method based on pulsation test

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Embodiment Construction

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0033] The embodiment of the present invention discloses a truss structure damage assessment method based on pulse test, such as figure 1 The truss structure is shown, and its basic parameters are: the cross section of the member is The hollow square tube, the cross-sectional area ,Elastic Modulus ,density . The existing structure is simulated by assuming a 20% damage to the modulus of elasticity of the fifth member.

[0034] The steps of structural d...

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Abstract

The invention discloses a truss structure damage evaluation method based on a pulsation test, and relates to the field of structure health monitoring. The method comprises the steps: firstly, numbering all rod pieces of a truss structure and degrees of freedom of all end nodes of the rod pieces, and establishing a finite element model of the truss structure to obtain a rigidity matrix and a mass matrix; secondly, mounting wireless acceleration sensors on all nodes of the truss structure, and recording characteristic values of all orders of structural pulsation and corresponding vibration modes; carrying out normalization operation on each order of vibration mode; calculating a virtual displacement matrix, a damage index vector and a damage degree factor of the truss structure; and finally,evaluating the position of the damaged rod pieces according to the damage index vector, and evaluating the damage degree according to the damage degree factor. When the method is used for evaluatingthe damage of the truss structure, no special manual excitation external load needs to be applied, and the time and cost required by damage evaluation can be saved.

Description

technical field [0001] The invention relates to the field of structural health monitoring, in particular to a pulsation test-based damage assessment method for truss structures. Background technique [0002] Truss structures are widely used in civil, mechanical, aviation and marine engineering fields, such as steel truss roofs, steel truss bridges, tower cranes, crane arms, offshore platforms, etc. Due to factors such as environmental corrosion, material fatigue, and loose connectors, structural damage will inevitably occur. Only by timely and accurately identifying the damage in the structure can a corresponding reinforcement and maintenance plan be adopted to avoid major safety accidents. In recent years, several damage assessment methods for truss structures have been proposed. [0003] Patent CN102495134B discloses a damage location method for truss structures based on additional mass, which uses the comparison of the peak position of the frequency response of the bar a...

Claims

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Application Information

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IPC IPC(8): G01M13/00G01N29/04G01H17/00
CPCG01H17/00G01M13/00G01N29/04G01N2291/02827G01N2291/0289
Inventor 杨秋伟吕忠达朋茜赵卓
Owner NINGBO UNIVERSITY OF TECHNOLOGY
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