Due to its robustness and cost-effectiveness, the three-phase induction motor (TIM) has become most widespread electric machine today. However, like any other equipment, it is vulnerable a fault, about 52% of these are related bearings. This work presents detection flaws in outer bearing's raceway from measurement dynamic strain signals collected sensors based on fiber Bragg grating (FBG). Three different degrees severity were considered for faults raceway. The tests carried out operating...

Ultrasound imaging systems (UIS) are essential tools in nondestructive testing (NDT). In general, the quality of images depends on two factors: system hardware features and image reconstruction algorithms. This paper presents a new algorithm for ultrasonic NDT. The reconstructs from A-scan signals acquired by an with monostatic transducer pulse-echo configuration. It is based regularized least squares using l1 regularization norm. method tested to reconstruct point-like reflector, both...

Many methods for estimating frequency components of stationary signals in power systems are based on the Discrete Fourier Transform. These have a fixed resolution which depends sampling and number samples signal, making it difficult to estimate interharmonics. This paper presents an algorithm harmonics interharmonics system using signal sparse decomposition technique with overcomplete dictionary. Trigonometric Transforms been analyzed building this The l-fold method has also applied...

In Nondestructive Evaluation (NDE), ultrasound imaging is a useful tool for detecting flaws or measuring corrosion in metal pipes. Phased-array systems are becoming standard NDE, as well post-processing techniques such the Total Focusing Method. These require knowledge of parameters distance between transducer elements, times arrival and sound speed to produce sharp images. A deviation speed, instance, may compromise image accuracy. this paper, we propose estimator based on quality metrics....

Ultrasonic imaging is a common technique in nondestructive evaluation, as it presents advantages such low cost and safety of operation. In many industries, the interior inspection objects with complex geometry has become necessity. This kind requires transducer to be coupled object use some technique, immersing water. When doing so, surface must known priori or estimated. Recent methods for estimation start an image interface between water specimen. Then, estimated by processing using...

Abstract Identifying and mapping corrosion represents a significant challenge in maintaining oil production systems. Mechanical chemical phenomena, such as abrasion hydrogen attack, cause on the internal surface of pipes. Knowing dimensions enables technicians to make decisions about structural stability pipelines under operating conditions. Using ultrasound imaging is non-destructive approach assessing state surfaces. We present web application for processing signals image reconstruction....

Abstract Full Waveform Inversion (FWI) is a state-of-the-art family of methods for seismic imaging. These are based on optimization algorithms and allow the reconstruction maps certain material properties (e.g. sound speed) with high resolution, providing powerful tool assessment reservoirs oil gas. The Nondestructive Evaluation (NDE) literature contains some attempts to apply FWI using ultrasonic data. One problem that limits this application oscillatory nature signals, which tends generate...

Odometer information is an important feature of NDT systems for inspection procedures that involve mechanical scanning. Knowledge transducer position during the allows localization flaws and fusion (stitching) several images into more sophisticated representations inspected object. Commercial encoders provide with accurate realtime displacement can be integrated to obtain odometry. However, this typically limited a single axis. Although composite schemes than one encoder built 2-D or 3-D...

Ultrasound testing techniques, either nondestructive (NDT) or medical, suffer from spatial signal attenuation, where equivalent scatterers at different distances the transducer will display amplitudes. If not corrected, these differences may lead to erroneously interpretation. In NDT, Time Corrected Gain (TCG) compensates for attenuation by increasing input gain according expected attenuation. Because TCG does consider noise, signals coming far are highly amplified, and so is noise. Wiener...

This paper presents a new algorithm for discontinuity location and characterization using A-scan signals from an ultrasonic inspection system. The is based on solving inverse problem in which the observation model different that traditionally used. In this model, input vector represents of geometrical center scattering amplitude embedded impulse response First, we jointly estimate locations amplitudes discontinuities acquired signals. Then, parameters are calculated estimated amplitude....

In this paper, the Support Vector Regression (SVR) technique is use for speed estimation of a Three Phase Induction Motor (TIM) by dynamic strain measurement analysis running at different load condition. The induced mechanical and electrical forces measure fiber Bragg gratings (FBGs), installed inside motor, in between two stator teeth. A frequency inverter driver operating 60 Hz to run motor 0%, 23.15%, 36.28%, 40.03% 41.3% nominal load. estimate based on SVR with maximum absolute error...

Abstract Stereoscopic cameras (a class of depth cameras) are increasingly present in robotics navigation and 3D scene reconstruction. Normally, off-the-shelf not suited for underwater environments exhibit considerable distortions the provided images when operating underwater. This is mainly due to large difference refractive coefficients air water. issue prevents their use subsea applications such as inspection oil pipelines, valves manifolds, where these devices could be used odometry...

Stereoscopic cameras, also known as depth are increasingly present in robotics navigation and 3D scene reconstruction. Normally, off-the-shelf cameras not suited for underwater environments exhibit considerable distortions the provided images when operating underwater. This is mainly due to large difference refractive coefficients of air water. issue prevents their use subsea applications such inspection oil pipelines, valves manifolds, where these devices could be used odometry during...

Ultrasonic (UT) imaging is a widespread technique for nondestructive testing (NDT). The state-of-the-art UT image reconstruction algorithms are based on delay-and-sum (DAS) operations, which assume constant acoustic velocity across the tested objects and also neglects nonlinear effects such as diffractions multiple reflections. These assumptions limit capabilities of DAS-based algorithms, especially complex composed by several materials. In seismology, Full Waveform Inversion (FWI) methods...

Full Waveform Inversion (FWI) is a state-of-the-art method of image reconstruction with promising results for seismology and NDT. FWI estimates the velocity wave propagation along inspected object by iteratively comparing acquired data simulated data. This computationally demanding as at least three simulations are needed per iteration, which motivates research effort fast simulation methods. When simulating acoustic waves within finite domain, artificial reflections created boundaries yield...

Ultrasound NDT is a standard industrial technique for health monitoring and flaw identification in several structures, such as subsea oil pipelines. Its primary purpose to form representative image of the internal structure inspected object, which provides, many cases, early warning discontinuities, making it possible reduce repair costs mitigate risks. One imaging methods that has been receiving increasing attention ultrasound seismology communities Full Waveform Inversion (FWI), estimates...