Unlock instant, AI-driven research and patent intelligence for your innovation.
Two-damage quantitative identification method of rectangular and round section beam structure
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A circular cross-section, quantitative recognition technology, applied in special data processing applications, instruments, biological neural network models, etc., can solve the problems of no effective method, stay, etc.
Inactive Publication Date: 2012-06-27
GUILIN UNIV OF ELECTRONIC TECH
View PDF0 Cites 0 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
However, the current waveletfinite element method still stays at the level of single damage diagnosis of beam structures, and there is no effective method for two damage diagnosis problems of beam structures with rectangular or circular cross sections.
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
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0049] In this example, two damage quantitative identification methods for rectangular cross-section beam structures are presented. figure 1 The schematic front view of the two damaged beam structures shown is a cantilever beam fixedly supported at the left end, the length of the beam is L=565mm, and the elastic modulus E=2.06×10 11 N / m 2 , density ρ=7890kg / m 3 , Poisson's ratio μ=0.3.
[0050] 2 damages on the beam, e i (i=1, 2) is the position where the damage occurs, and the relative position β i = e i / L(i=1, 2). δ i (i=1, 2) represents the damage depth, that is, the degree of damage. In this example, the section of the damaged part of the rectangular section beam is as follows: figure 2 As shown, the height of the beam h=20mm, the width of the beam b=12mm, the relative depth of the damage here is α i = δ i / h(i=1, 2).
[0051] In this example, the implementation steps of the two damage quantitative identification methods for the rectangular cross-section beam ...
Embodiment 2
[0094] This example is a quantitative identification method for two damages of a circular cross-section beam structure. This example is a simply supported beam supported at both ends, and the beam structure is also as figure 1 As shown, the cross-section of the damaged part is shown as image 3 shown. The length of the beam is L=1000mm, the diameter of the circular section is d=50mm, the radius is r=d / 2, and the elastic modulus E=2.06×10 11 N / m 2 , density ρ=7860kg / m 3 , Poisson's ratio μ=0.3.
[0095] There are 2 damages on the beam structure, e i (i=1, 2) is the position where the damage occurs, and the relative position β i = e i / L(i=1, 2). δ i (i=1, 2) represents the damage depth, the relative depth of damage α i = δ i / d(i=1, 2), ξ is the abscissa, η is the ordinate, α i (ξ) is the damage depth function.
[0096] The specific implementation steps of the two damage quantitative identification methods for circular cross-section beam structures in this example a...
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
Login to View More
Abstract
The invention discloses a two-damage quantitative identification method of a rectangular and round section beam structure, comprising the following steps: 1. building an interval B spline wavelet finite element model for two-damage quantitative identification of the beam structure, and obtaining a direct problem database for two-damage diagnosis; and 2. adopting the model obtained in the above step, and identifying whether two damages of the beam structure happen by a neural network transmission method as well as the position and the depth. In the mixed method of a wavelet finite element and a neural network, after the trained two-damage identification neural network of the beam structure is provided, the method can obtain the first fourth-order natural frequency of the practical beam structure only by experiments to reliably carry out two-damage quantitative identification on the rectangular and round section beam structure. The method is suitable for quantitative identification on the rectangular and round section beam structure which is widely used in engineering.
Description
technical field [0001] The invention belongs to the technical field of structural damage quantitative identification, and in particular relates to a method for quantitative identification of two damages of rectangular and circular cross-section beam structures. Background technique [0002] Structural damage is one of the most prominent hidden dangers of the working state structure. If it is not detected, diagnosed and eliminated in time, it will disrupt the normal production process. However, the mechanical structure is developing in the direction of lightness and exquisiteness, which makes accidents caused by damage and failure continue to occur in recent years, causing major economic losses and even casualties. Therefore, using simple and feasible techniques to determine the damage and defects inside the structure has become a topic of great concern and continuous exploration in the engineering field. [0003] Since any dynamical system can be regarded as a mechanical sy...
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
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to View More 
Login to View More