Modeling Progress of Lamb Waves by Using Genetic Algorithm and S-transformation

Modeling the Propagation of Lamb Waves using a Genetic Algorithm and S-transformation

Many structural health monitoring (SHM) applications in use monitor the progress of Lamb waves across a test object in order to detect structural problems, such as cracks and material losses. This study proposes the use of S-transformation techniques to identify the frequency–time domain characteristics and to reduce the noise of the signals at the receiver. Two time domain models, time delay–a...

Application of Wavelet Transform as a Signal Processing Method for Defect Detection using Lamb Waves: Experimental Verification

A Lamb wave-based crack detection method for aluminum plates health monitoring is developed in this paper. Piezoelectric disks are employed to actuate and capture the Lamb wave signals. The position of crack is assumed to be aligned with the sensor and actuator.  Extraction of high quality experimental results of lamb wave propagation in a plate-like structure is considerably complicated due to...

Elastic characterization of porous bone by ultrasonic method through Lamb waves

The object of this research is to characterize the porous bones by an ultrasonic method using Lamb waves. In recent years, the characterization of such materials has attracted many authors and takes a perfect place in the field of medicine. It requires the development of more efficient technology for getting the necessary quality and security. This paper aims to exploits the dispersion curves o...

Modeling of measurement error in refractive index determination of fuel cell using neural network and genetic algorithm

Abstract: In this paper, a method for determination of refractive index in membrane of fuel cell on basis of three-longitudinal-mode laser heterodyne interferometer is presented. The optical path difference between the target and reference paths is fixed and phase shift is then calculated in terms of refractive index shift. The measurement accuracy of this system is limited by nonlinearity erro...

Modeling Habitat Requirements of Leopard (Panthera pardus) Using Genetic Algorithm in Golestan National Park