Large Dynamic Strain Measurement in Φ-OTDR Based on Ultra-Weak FBG Array

Author(s):  
Rui Hong ◽  
Feng Wang ◽  
Yu Liu ◽  
Guojie Tu ◽  
Zhen Liu ◽  
...  



2021 ◽  
Author(s):  
Rafael Mancuso Paraiso Cavalcanti ◽  
Jaqueline Bierende ◽  
Beatriz Brusamarello ◽  
Jean Carlos Cardozo Da Silva ◽  
Giovanni Alfredo Guarneri ◽  
...  


Author(s):  
Mark D. Sensmeier ◽  
Kurt L. Nichol

Correlation between dynamic strain gage measurements and modal analysis results can be adversely affected by gage misplacement and gage misorientation. An optimization algorithm has been developed which allows the modeled strain gage locations and orientations to be varied within specified tolerances. An objective function is defined based on the least squares sum of the differences between experimental and model results. The Kuhn-Tucker conditions are then applied to find the gage locations and orientations which minimize this objective function. The procedure is applied on a one-time basis considering all measured modes of vibration simultaneously. This procedure minimizes instrumentation error which then allows the analyst to modify the model to more accurately represent other factors, including boundary conditions. Flat plate vibratory data was used to demonstrate a significant improvement in correlation between measured data and model predictions.





2010 ◽  
Vol 34-35 ◽  
pp. 1323-1327 ◽  
Author(s):  
Chun Mei Xu ◽  
Chun Yao Wang ◽  
Fa Chen ◽  
Min Lei ◽  
Yong Xin Jiang ◽  
...  

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.



2003 ◽  
Vol 42 (Part 1, No. 4B) ◽  
pp. 2193-2197 ◽  
Author(s):  
Naoya Watanabe ◽  
Tanemasa Asano


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