Damage identification in a plate structure based on a cross-direction strain measurement method

According to the higher order modes of the structure are difficult to extract and the lower order are easy to obtain in practice, it is put forward that only uses the parameters of lower or first-order modal to constitute the modal flexibility curvature difference (MFCD) as the index of damage identification, which based on the flexibility matrix of structure being sensitive to the structure modal characteristics. Numerical analysis is made on different damage conditions of a plate structure, and the result shows that the MFCD can not only accurately identify the single-damage and multi-damage position of plate structure, but also reflect the size of damage degree. It has a great significance to apply the index into the range of damage identification of actual structures.

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An Approach to Analyse Errors Introduced in the Random Grid Strain Measurement Method

Strain ◽

10.1111/j.1475-1305.2008.00444.x ◽

2008 ◽

Vol 46 (3) ◽

pp. 258-266 ◽

Cited By ~ 5

Author(s):

A. P. Iliopoulos ◽

N. P. Andrianopoulos

Keyword(s):

Strain Measurement ◽

Measurement Method ◽

Random Grid

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Strain Measurement Based on Speeded-up Robust Feature Algorithm Applied to Microimages from a Smartphone-Based Microscope

Sensors ◽

10.3390/s20102805 ◽

2020 ◽

Vol 20 (10) ◽

pp. 2805 ◽

Cited By ~ 1

Author(s):

Botao Xie ◽

Jinke Li ◽

Xuefeng Zhao

Keyword(s):

Health Monitoring ◽

Strain Measurement ◽

Measurement Method ◽

Feature Points ◽

Matching Effect ◽

Point Tracking ◽

Feature Point Tracking ◽

M Estimator ◽

Practical Engineering ◽

Accuracy And Stability

The objective of this study is to evaluate and improve the accuracy and stability of a strain measurement method that uses the speeded-up robust feature (SURF) method to trace the displacement of feature points in microimages and obtain the strain in objects. The microimages were acquired using a smartphone with a portable microscope, which has a broad prospect of application. An experiment was performed using an unpacked optical fiber as the experimental carrier. The matching effect of the SURF method was analyzed in the microimage, and the M-estimator sample consensus (MSAC) algorithm was used to reject outliers generated by SURF. The results indicated that the accuracy of strain measurement using the proposed method is improved by modifying the feature point tracking method and measurement method. When compared with the fiber Bragg grating (FBG) data, the maximum standard error corresponded to 2.5 με, which satisfies the requirement of structural health monitoring (SHM) in practical engineering.

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The Measurement of Dynamic Stress for The Top-Cutter Machine of Cotton

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.34-35.1323 ◽

2010 ◽

Vol 34-35 ◽

pp. 1323-1327 ◽

Cited By ~ 1

Author(s):

Chun Mei Xu ◽

Chun Yao Wang ◽

Fa Chen ◽

Min Lei ◽

Yong Xin Jiang ◽

...

Keyword(s):

Fatigue Strength ◽

Strain Measurement ◽

Measurement Method ◽

Dynamic Stress ◽

Stress Condition ◽

Dynamic Strain ◽

Measurement Result

In this paper, we used the dynamic strain measurement method to measure the top-cutter machine of cotton’s stress under its working state. With sorting out data and analyzing it, we obtained the stress condition of the framing and the working parts. And the measurement result could be used to analyze the axle’s fatigue strength and check whether it was safe or not. It provided integrant basis for the further design of the machine.

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