Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Structure health monitoring method based on distributed strain dynamic test

A distributed strain and dynamic testing technology, applied in infrastructure engineering, infrastructure testing, measuring devices, etc., can solve the distortion of structural mathematical models, consume a lot of manpower and material resources, and the modal curvature method is susceptible to noise and errors Interference and other problems, to achieve the effect of temperature compensation

Inactive Publication Date: 2008-07-16
吴智深 +1
View PDF1 Cites 48 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) On-site detection method based on static test: it must be carried out under the premise of specifying the applied load. This method needs to strictly control the conditions of the applied static load. It not only consumes a lot of manpower and material resources when loading, but also must stop the structure. normal working condition
[0006] (2) Detection methods based on dynamic testing: There are too many parameters to be identified using model update or system identification structural analysis methods, and the structural mathematical model may be distorted. At the same time, the algorithm is difficult to converge and its effectiveness is easily affected by actual measurement noise and errors; The detection of the analysis method that does not require the structural mathematical model also has its own defects: the frequency domain method based on vibration testing can only obtain a few first few order frequencies and mode shapes of the structural response under actual test conditions, and cannot be directly used for small damage diagnosis The modal curvature method is easily disturbed by noise and errors, and requires enough measuring points to ensure accuracy; the flexibility matrix method is not easy to reflect the information of local damage in multiple parts of the structure or adjacent positions, etc.
[0007] (3) Measurements using accelerometers, speedometers or displacement sensors are all responses to the translational degree of freedom at a certain point of the structure. These responses have no direct and clear relationship with the local damage of the structure, and the damage at a certain position will vary in degree. The measurement value of the sensors arranged in a certain area near the position is greatly affected, and multiple damages at different positions will be reflected in the measurement value of a sensor to varying degrees. This coupling relationship makes the structural response analysis based on these sensor measurements facing great difficulties
[0008] (4) For the traditional "point" strain gauge, if the local damage in the structure does not appear within the test range of the installed sensor, it is difficult to be detected accurately; If placed in the area, the sensor will often fail due to local stress concentration or cracks in the area
Therefore, it is difficult for the "point" distributed strain sensor to effectively capture the unpredictable structural damage in advance, but it is also unrealistic to arrange the sensors densely on a large structure, so the "point" strain sensor cannot adapt to the detection area as large as possible. "Distributed measurement" covering the entire structure

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Structure health monitoring method based on distributed strain dynamic test
  • Structure health monitoring method based on distributed strain dynamic test
  • Structure health monitoring method based on distributed strain dynamic test

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0031] The present invention will be further described below in combination with specific embodiments and accompanying drawings.

[0032] First, please refer to FIG. 1 for a schematic structural diagram of a hardware system of the present invention. The structural health monitoring method based on distributed strain dynamic testing is used for real-time online monitoring of structural damage or degradation of engineering structures or product structures under load conditions. The hardware system used includes sensor network 1 , sensor signal demodulation and acquisition system 2 and data processing and monitoring system 3 . The sensor network 1 is used to sense the response of the structure, the sensor signal demodulation acquisition system 2 is used to demodulate and collect the raw data of the response of the monitored structure, which may be a sensor demodulator, and the data processing and monitoring system 3 It is used for data processing, storage, management and output o...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for monitoring the structure health based on a distributed strain dynamic test; the invention adopts a distributed strain transducer to build a distributed sensing network and selects to arrange a reference transducer, carries out structure system simulation state analyzing to obtain a distributed strain simulation state vector DMSV, originally takes whether a target characteristic vector Alpha changes or not as a criterion to identify structural damage, obtains the effects of being capable of rapidly, accurately and effectively capturing the structural damage and locating, and simultaneously adopts the reasonable measures of real time image display and deleting redundant data on time, thereby having the advantages of small errors, high precision, simple process and intuitionistic monitoring; the method can eliminate the interference of noise and environment under the conditions of uncertain loading and an unknown mathematical model, carry out on-line structural damage detecting and diagnosing in real time and is suitable for long period monitoring of various engineering structures, especially for the civil structure.

Description

Technical field: [0001] The invention relates to a method for monitoring engineering structures, in particular to a structural health monitoring method based on distributed strain dynamic testing. Background technique: [0002] With the continuous improvement of people's requirements for the safety and reliability of engineering structures, monitoring and diagnosing structural performance, discovering structural damage in time, predicting possible disasters, and evaluating its safety have become important tasks for future structural design and manufacturing. , The inevitable requirements in construction and management work. In recent years, due to the progress of science and technology in all aspects and the needs of practical engineering, the technology called "structural health monitoring" in this field has been developed rapidly. The related products, systems and engineering applications are well known at home and abroad. Also emerge in endlessly. The so-called Structur...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G01N3/00E02D33/00
Inventor 吴智深李素贞
Owner 吴智深
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products