scholarly journals Structural health monitoring of beams with moving oscillator: theory and laboratory

2021 ◽  
Vol 73 (07) ◽  
pp. 693-704
Keyword(s):  
Time History ◽  
Frequency Variation ◽  
Frequency Range ◽  
Variation Pattern ◽  
Fuzzy Genetic Algorithm ◽  
Specific Frequency ◽  
Fuzzy Genetic ◽  
Moving Oscillator ◽  
Emd Method ◽  
Oscillator Theory

In this paper, a new intelligent portable mechanical system is introduced experimentally and theoretically to detect damage employing the fuzzy-genetic algorithm and EMD. For this purpose, the acceleration-time history is obtained from three points of a simply-supported beam utilizing accelerometer sensors. The gained signal is decomposed into small components by using an EMD method. Each decomposed component contains a specific frequency range. Finally, the proposed algorithm is designed to find the location and severity of damage through the frequency variation pattern among the safe and the damaged beam.

scholarly journals Experimental Investigation of Damage Detection in Beam Using Dynamic Excitation System

2017 ◽  
Vol 3 (10) ◽  
pp. 920 ◽  
Author(s):  
Mehdi Kouhdaragh
Keyword(s):  
Genetic Algorithm ◽  
Damage Detection ◽  
Time History ◽  
New Method ◽  
Mode Decomposition ◽  
Fuzzy Genetic Algorithm ◽  
Empirical Mode Decomposition Method ◽  
History Of ◽  
Structural Failures ◽  
Fuzzy Genetic

Most structural failures are due to break in consisting materials. These breaks begin with a crack, the extension of which is a serious threat to the behaviour of structure. Thus the methods of distinguishing and showing cracks are the most important subjects being investigated. In this article, a new smart portable mechanical system to detect damage in beam structures via using fuzzy-genetic algorithm is introduced. Acceleration-time history of the three points of beam is obtained. The signals are then decomposed into smaller components using new EMD (Empirical Mode Decomposition) method with every IMF containing a specific range of frequency. The dominant frequencies of the structure are obtained from these IMFs using Short-term Fourier transform. Subsequently, a new method of damage detection in simply supported beams is introduced based on fuzzy-genetic algorithm. The new method is capable of identifying the location and intensity of the damage. This algorithm is developed to detect the location and intensity of the damage along the beam, which can detect the damage location and intensity based on the pattern of beam frequency variations between undamaged and damaged states.

scholarly journals Aluminium foam production control by using a combined fuzzy-genetic algorithm model

Procedia CIRP ◽  
2020 ◽  
Vol 88 ◽  
pp. 503-508
Author(s):  
Gennaro Salvatore Ponticelli ◽  
Stefano Guarino ◽  
Oliviero Giannini ◽  
Flaviana Tagliaferri ◽  
Simone Venettacci ◽  
...  
Keyword(s):  
Genetic Algorithm ◽  
Production Control ◽  
Aluminium Foam ◽  
Fuzzy Genetic Algorithm ◽  
Fuzzy Genetic ◽  
Foam Production ◽  
Genetic Algorithm Model

Fuzzy-Genetic Algorithm for Pre-Processing Data at the RTU

2004 ◽  
Vol 19 (2) ◽  
pp. 718-723 ◽  
Author(s):  
P. Kumar ◽  
V.K. Chandna ◽  
M.S. Thomas
Keyword(s):  
Genetic Algorithm ◽  
Processing Data ◽  
Fuzzy Genetic Algorithm ◽  
Fuzzy Genetic

Fast Covariance Matching With Fuzzy Genetic Algorithm

2012 ◽  
Vol 8 (1) ◽  
pp. 148-157 ◽  
Author(s):  
Xuguang Zhang ◽  
Shuo Hu ◽  
Dan Chen ◽  
Xiaoli Li
Keyword(s):  
Genetic Algorithm ◽  
Covariance Matching ◽  
Fuzzy Genetic Algorithm ◽  
Fuzzy Genetic

scholarly journals A Novel Frequency Reconfigurable Microstrip Patch Antenna using Pin Diode

2020 ◽  
Vol 9 (5) ◽  
pp. 2013-2017
Keyword(s):  
Patch Antenna ◽  
Return Loss ◽  
Microstrip Patch Antenna ◽  
Pin Diode ◽  
Optimum Level ◽  
Frequency Range ◽  
Microstrip Patch ◽  
Single Antenna ◽  
Specific Frequency ◽  
Switching State

In recent study, in the growth of wireless technology single antenna that works with a specific frequency is becoming outdated. The antenna which is capable to work dynamically is encouraged. To make an antenna to work dynamically, modification in any of the antenna characteristics can be applied. In this proposed work, the antenna which can reconfigure its frequency is designed and analyzed. Microstrip patch antenna is most popular printed type antenna which is suitable for diverse applications. The antenna design consists of three PIN diodes which are placed in different positions on the patch. Depending upon the switching state of PIN diode the antenna can operate in different frequency ranges. The frequency range obtained ranges from 1.38 GHz to 3.24 GHz. Return loss value, VSWR obtained is of optimum level. The various gain of antenna is obtained in simulation. The analysis of the antenna is done in ANSYS HFSS software.

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