DR. ARTURO BALTAZAR HERREJÓN

@article{Ramos-Oliveira2019,

title = {On ray tracing for sharp changing media},

author = {Ramos-Oliveira, Jorge and Baltazar, Arturo and Castelan, Mario},

url = {https://doi.org/10.1121/1.5125133},

doi = {10.1121/1.5125133},

year  = {2019},

date = {2019-07-10},

journal = {Journal of the Acoustic Society of America},

volume = {146},

number = {3},

pages = {1595-1604},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{carreon2017development,

title = {Development of a model-free force controller for soft contact of an ultrasonic test probe},

author = {Carreon, Augusto and Baltazar, Arturo and Treesatayapun, Chidentree},

year  = {2017},

date = {2017-01-01},

journal = {The International Journal of Advanced Manufacturing Technology},

volume = {90},

number = {9-12},

pages = {2839--2847},

publisher = {Springer},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{7118647,

title = {Determination of Contact Evolution on a Soft Hemispherical Probe Using Ultrasound},

author = {Carreon, Augusto and Baltazar, Arturo and Kim, J.},

url = {http://ieeexplore.ieee.org/document/7118647/},

doi = {10.1109/JSEN.2015.2439293},

issn = {1530-437X},

year  = {2015},

date = {2015-09-01},

journal = {IEEE Sensors Journal},

volume = {15},

number = {9},

pages = {5303-5311},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{0964-1726-24-7-075008,

title = {Damage detection using the signal entropy of an ultrasonic sensor network},

author = {Rojas, Erick and Baltazar, Arturo and Loh, K.},

url = {http://stacks.iop.org/0964-1726/24/i=7/a=075008},

year  = {2015},

date = {2015-01-01},

journal = {Smart Materials and Structures},

volume = {24},

number = {7},

pages = {075008},

abstract = {Piezoelectric ultrasonic sensors used to propagate guided waves can potentially be implemented to inspect large areas in engineering structures. However, the inherent dispersion and noise of guided acoustic signals, multiple echoes in the structure, as well as a lack of an approximate or exact model, limit their use as a continuous structural health monitoring system. In this work, the implementation of a network of piezoelectric sensors randomly placed on a plate-like structure to detect and locate artificial damage is studied. A network of macro fiber composite (MFC) sensors working in a pitch\^{a}€“catch configuration was set on an aluminum thin plate 1.9 mm in thickness. Signals were analyzed in the time-scale domain using the discrete wavelet transform. The objectives of this work were threefold, namely to first develop a damage index based on the entropy distribution using short time wavelet entropy of the ultrasonic waves generated by a sensor network, second to determine the performance of an array of spare MFC sensors to detect artificial damage, and third to implement a time-of-arrival (TOA) algorithm on the gathered signals for damage location of an artificial circular discontinuity. Our preliminary test results show that the proposed methodology provides sufficient information for damage detection, which, once combined with the TOA algorithm, allows localization of the damage.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Iba\~{n}ez2015,

title = {Detection of damage in multiwire cables based on wavelet entropy evolution},

author = {Iba\~{n}ez, Flor and Baltazar, Arturo and Mijarez, Rito},

url = {http://iopscience.iop.org/article/10.1088/0964-1726/24/8/085036},

doi = { http://dx.doi.org/10.1063/1.4914760},

year  = {2015},

date = {2015-00-00},

journal = {Smart Materials and Structures 2},

volume = {24},

number = {8},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Balvanti­n2014,

title = {Characterization of Laser Generated Lamb Wave Modes after Interaction with a Thickness Reduction Discontinuity Using Ray Tracing Theory},

author = {Balvantin, A. and Baltazar, Arturo and Rodriguez, P.},

url = {http://dx.doi.org/10.1007/s11340-013-9846-y},

doi = {10.1007/s11340-013-9846-y},

issn = {1741-2765},

year  = {2014},

date = {2014-01-01},

journal = {Experimental Mechanics},

volume = {54},

number = {5},

pages = {743--752},

abstract = {The effect that a circular discontinuity (due to thickness reduction) in an Aluminum plate has on the direction of Lamb wave propagation was experimentally and theoretically studied. Broadband Lamb waves were generated by a pulsed Nd:YAG laser and optically detected with a photo-EMF detector to increase spatial resolution. The experimental results show that thickness reduction modifies the time of flight (TOF) for S0 and A0 vibration modes and generates a change in direction of the ultrasonic Lamb wave. The change in the TOF as a function of distance and thickness reduction was numerically determined using ray theory and then compared to experimental results. It is shown that the change in the direction of propagation depends on the vibrational mode and frequency of the Lamb waves and this can affect the detection and characterization of a hidden discontinuity.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Mijarez2014,

title = {Damage detection in ACSR cables based on ultrasonic guided waves},

author = {Mijarez, Rito and Baltazar, Arturo and Rodr\'{i}guez-Rodr\'{i}guez, Joaquin and Ram\'{i}rez-Ni\~{n}o, Jose },

url = {http://revistas.unal.edu.co/index.php/dyna/article/view/40252/53905},

doi = { https://doi.org/10.15446/dyna.v81n186.40252},

issn = {0012-7353},

year  = {2014},

date = {2014-00-00},

journal = {DYNA},

volume = {81},

number = { 186},

pages = { 226-233},

abstract = {The use of ultrasonic guided waves is growing as a non-destructive testing technique of multi-wire cables used in civil engineering structures. Wave propagation characteristics in these types of structures have been challenging to investigate owing to the load-dependent inter-wire contact and the helical geometry of the peripheral wires. In this work, experiments of guided waves propagated in a 0.9m Aluminum Conductor Steel Reinforced (ACSR) cable were conducted employing two longitudinal piezoelectric transducers attached to the ends of the cable in a through transmission configuration. Longitudinal L(0,1) and flexural F(1,1) modes were identified at 500 kHz via dispersion curves and Wavelet Transforms (WT). Experiments included artificial damage introduced in the middle of the cable by cutting and gradually increasing the cut depth from 1mm to 9mm. The attained results suggest a change of guided modes excitation and reception from F(1,1) to L(0,1) due to reduced friction contact among individual wires. This change of guided waves modes in response to damage variations, associated with the transmitted ultrasonic energy, was identified and discussed as potential mean of damage monitoring.



Keywords: Ultrasonic guided waves; wavelet transform; ACSR cables inspection.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}