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Bridge-type crane main-beam local-damage locating method

A technology for bridge cranes and damage location, which is applied to instruments, using sound waves/ultrasonic waves/infrasonic waves to analyze solids, and processing detection response signals. Number, the effect of improving positioning accuracy

Inactive Publication Date: 2019-12-20
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The main girder of the bridge crane is a long-span three-dimensional steel structure. The existing direct positioning method requires a large number of sensors, which not only increases the cost of damage positioning, but also complicates the process and reduces efficiency.

Method used

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  • Bridge-type crane main-beam local-damage locating method
  • Bridge-type crane main-beam local-damage locating method
  • Bridge-type crane main-beam local-damage locating method

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Embodiment Construction

[0034] In this embodiment, the process of adopting the hierarchical progressive strategy and based on the acceleration frequency response analysis and the curvature modal method to respectively locate the beam segment level and the plate unit level damage of the crane main girder is as follows: figure 1 shown, including the following steps:

[0035] Step S1, locate the damaged beam segment based on the acceleration frequency response analysis:

[0036] In step S1.1, the main girder of the crane is divided into 13 beam sections along the transverse direction and the harmonic response analysis is performed, and the 14 nodes on the center line of the lower cover plate of the adjacent beam sections are used as the output points of the acceleration frequency response, as shown in figure 2 shown;

[0037] Step S1.2, taking the variation of the acceleration frequency response amplitude a(f) of each output node before and after the damage occurs as an element to form a matrix:

[0...

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Abstract

The invention provides a bridge-type crane main-beam local-damage locating method. The method includes the following steps: step 1, locating a beam segment, where damage occurs, on the basis of acceleration frequency response analysis; and step 2, recording the identified damage beam segment as Qi, and further locating a plate element, where the damage occurs, in Qi on the basis of a curvature mode.

Description

technical field [0001] The invention relates to a crane safety detection technology, in particular to a local damage location method for a bridge crane main girder. Background technique [0002] With the continuous acceleration of the industrialization process, large cranes have increasingly become indispensable key equipment in the production of major industries such as machinery, shipbuilding, and metallurgy. It is of great significance to find out the local fine damage in the early stage of the structure in time to scientifically evaluate the health status of the cranes in service. The key to the damage location method based on structural dynamic test data is the selection of measurement parameters. Commonly used parameters with high sensitivity to damage are: structural natural frequency, displacement mode shape, strain mode shape and mode curvature. [0003] The main girder of the bridge crane is a long-span three-dimensional steel structure. The existing direct positi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04G01N29/46
CPCG01N29/04G01N29/46G01N2291/023G01N2291/0289
Inventor 仲猛童一飞裴凤雀
Owner NANJING UNIV OF SCI & TECH