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Bridge moving load identification method based on cascaded dictionaries and sparse regularization

A moving load and identification method technology, applied in character and pattern recognition, instruments, computer parts, etc., can solve the problems of indistinct signal characteristics, low accuracy of moving load identification, and inability to describe unknown moving loads completely and concisely. Achieve the effect of strong innovation, huge economic benefits and commercial value

Active Publication Date: 2017-03-15
JINAN UNIVERSITY
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Problems solved by technology

Therefore, in the identification of moving loads, the use of a single type of basis function set will not be able to describe the unknown moving loads completely and concisely, making the identification accuracy of moving loads low, and the identified signal features are not obvious

Method used

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  • Bridge moving load identification method based on cascaded dictionaries and sparse regularization
  • Bridge moving load identification method based on cascaded dictionaries and sparse regularization
  • Bridge moving load identification method based on cascaded dictionaries and sparse regularization

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Embodiment

[0059] Taking the laboratory girder bridge and trolley test model as the object, the implementation process of mobile vehicle load identification is described. The experimental device is as follows: image 3 As shown, the experimental bridge is a 3-meter-long girder hinged at both ends, and the cross-section of the experimental bridge is a rectangular thin-walled section, in which the width is 140mm, the height is 60mm, and the thickness is 3mm; the experimental car 1 is pulled by the motor 2 and passes through the experimental bridge 3 ; The real axle load of the experimental car 1 is: the front axle is 4.5955kg, and the rear axle is 6.0290kg; the wheelbase of the two axles of the experimental car 1 is 0.42m.

[0060] The specific implementation steps of mobile vehicle load identification are as follows:

[0061] (1) Install a speed measuring device above the experimental bridge 3. In this embodiment, the speed measuring device is composed of a truss structure 7 and a photoel...

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Abstract

The invention discloses a bridge moving load identification method based on cascaded dictionaries and sparse regularization. The method mainly includes the following steps: 1) arranging a speed measuring device on a bridge to be used for measuring vehicle speed, and arranging a plurality of strain and acceleration sensors on the bridge for actual measurement of bridge response; 2) building a bridge finite element model; 3) adopting cascaded dictionaries formed by a discrete trigonometric function and a discrete rectangular function to expand an unknown moving load; 4) normalizing actual measurement response, and introducing a weighted L1 norm regularization method to build an identification equation; and 5) utilizing a fast iterative shrinkage-thresholding algorithm (FISTA) to solve the equation, and calculating a corresponding time interval signal. The method provided by the invention can accurately identify a bridge moving load, including a slowly-changing integral signal and local impact signal in bridge moving vehicle load signals, has strong noise robustness, and is particularly suitable for field utilization of bridge response to estimate gross vehicle weight.

Description

technical field [0001] The invention belongs to the technical field of road safety monitoring, and relates to a bridge moving load identification technology, in particular to a bridge moving load identification method based on cascade dictionaries and sparse regularization. Background technique [0002] For bridge structure monitoring, vehicle moving load plays a very important role. It is one of the main live loads in the process of bridge operation and affects the service life of the bridge. However, it is very difficult to determine the size of the moving load by direct measurement because the moving load has both temporal and spatial variability. In this context, it is very necessary to study the indirect identification method of moving load. The indirect identification of moving loads refers to obtaining structural response information through sensors installed on the bridge structure, and using the structural response information combined with its dynamic characterist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/62
CPCG06F18/217
Inventor 余岭潘楚东
Owner JINAN UNIVERSITY
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