Method for modal analysis and structural impact monitoring based on compressed sampling

A modal analysis and compressive sampling technology, applied in impact testing, machine/structural component testing, mechanical component testing, etc. Loss less effect

Active Publication Date: 2017-08-18
XIAMEN UNIV
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Problems solved by technology

[0006] The main purpose of the present invention is to solve the problem of the accuracy of obtaining structural modal parameters of complex structures through modeling a

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  • Method for modal analysis and structural impact monitoring based on compressed sampling
  • Method for modal analysis and structural impact monitoring based on compressed sampling
  • Method for modal analysis and structural impact monitoring based on compressed sampling

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Embodiment Construction

[0029] The present invention will be further described below through specific embodiments.

[0030] refer to figure 1 , which is a block diagram of a system for applying the method of the present invention, including two main parts: a data acquisition module and a data processing module. The data acquisition module includes a sensor network, a charge amplifier, a random demodulation system, etc., and is used to realize compressed sampling. The data processing module mainly realizes two functions: 1. Apply the singular value decomposition method to the compressed data obtained by the compressed sampling to conduct the modal analysis of the structure to obtain the modal parameters of the structure, such as modal frequency and mode shape; 2. 1. Establish a disturbance optimization model of the structural system in the time domain based on the modal parameters and the collected compressed data, and then apply the base tracking noise reduction algorithm to the model to identify th...

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Abstract

The invention provides a method for modal analysis and structural impact monitoring based on compressed sampling and belongs to the technical field of structural health monitoring. According to the invention, a compressed sampling technology is used to collect impact load signals; then, modal analysis is conducted on compressed sampling data of the collected impact load signals by a singular value decomposition method, so that modal parameters of the structure are acquired; and finally, parameters including sizes and positions of impact loads are acquired through a signal reconstruction method based on the compressed sampling data. According to the invention, the problem about poor accuracy existing in structural modal parameter acquisition of a complicated structure based on modeling as well as the problem about overlarge data size of multiple sensors could be solved. The method has the advantages that a sensor network arranged on a to-be-monitored structure is used for impact monitoring; the structure can be monitored rapidly and accurately in real time; energy consumption is low; the size of stored and transmitted data is small; data loss is reduced during storage and transmission, etc.

Description

technical field [0001] The invention relates to structural health monitoring, in particular to a modal analysis and structural impact monitoring method based on compressed sampling data. Background technique [0002] Aluminum alloy materials are still widely used in aerospace and other fields due to their advantages of light weight, high strength, corrosion resistance, and easy processing. However, aluminum alloy material structures will inevitably be damaged during manufacturing and use, especially in the aerospace field. The low-speed impact caused damage to the structure of the aircraft that is invisible to the naked eye. To some extent, the damage caused by the impact may be more harmful than the damage caused by the high-speed impact. If these tiny damages are discovered in time, it may lead to sudden damage to the structure and cause inestimable losses. And as the aviation industry puts forward higher and higher requirements for structural safety and reliability. The...

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Application Information

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IPC IPC(8): G06F17/50H03M1/12G01M13/00G01M7/08
CPCG01M7/08G01M13/00G06F30/20H03M1/1245
Inventor 梁栋朱强范志锋李星
Owner XIAMEN UNIV
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