Ya. G. Smorodinskii

Wavelet Filtering of Signals from Ultrasonic Flaw Detector

The paper considers basic principles of the algorithm of wavelet filtering of signals from an ultrasonic aw detector with the help of the fast wavelet transform. Criteria for selection of the type and order of a wavelet are formulated, and the number of decomposition levels required for the needed accuracy and reproducibility of results of ultrasonic tests are determined.

Using wavelets for analyzing ultrasonic fields detected by a laser interferometer. Flaw detection and localization in an aluminum single-crystal

An example of using the wavelet transform for detecting and localizing a flaw in an aluminum single-crystal by analyzing ultrasonic fields detected by a laser interferometer on the surface of an elastic medium is considered.

Simulation of field and inductance spatial distribution in locally magnetized massive objects and optimization of U-shaped transducer design

The field and magnetic-inductance spatial distributions in plates that differ in geometric dimensions and magnetic properties, which were magnetized locally by U-shaped electromagnets of different standard sizes, were calculated using the finite element method. The magnetic-flux side scattering, which impedes the magnetization, was estimated qualitatively. Recommendations on designing magnetizing instruments, which are characterized by low side scattering, are given.

Acoustic fields detected by a laser interferometer in aluminum single crystals

Elastic fields in aluminum single crystals are studied using the laser interferometry technique. The measurements are conducted at a frequency of 10 MHz for the case of the wave propagation along the [001] and [111] axes and also for small deviations from the [111] axis. The energy distribution is measured in the transition region between the near and far fields. The energy of transverse elastic waves in the case of the propagation along the [111]-axis is distributed within a sector. The deviation of the propagation direction from this axis leads to radical changes in the energy distribution.

On the Inverse Problem of Magnetostatics

This work is devoted to solving the inverse problem of the magnetic method for nonde- structive testing (MMNDT). The purpose of the work, frankly speaking and avoiding complicated concepts and formulas, is to identify research directions in MMNDT that would approach solution of the inverse problem in the field of magnetic defectoscopy to the highest extent.

Choice of the parameters and algorithm for the magnetic hardness testing of thermally treated carbon steels by the method of regression modeling

The possibility of testing the hardness of quenched and tempered medium-carbon steels using their magnetic properties is studied. It is shown that the two-parameter method should be applied for the reliable estimation of the hardness. The coercive return magnetization (induction) and the coercive force must be used as the basic and subsidiary parameters of testing, respectively. It is established that the content of carbon in steel influences the sensitivity of testing. It is shown that the suggested magnetic hardness testing method can be practically implemented with the use of the modernized SIMTEST-2.10 system.

Automatic ultrasonic inspection of large-diameter pipes

A device and a principle of operation of some ultrasound scanners-flaw detectors for diagnosing the basic metal mass of main oil and gas pipelines in reinsulation is considered. Different methods, materials, and devices for efficient excitation and reception of ultrasound waves in pipelines with wall thicknesses of 6–20 mm and the selection of Lamb and Rayleigh wave modes for testing as a function of the pipe-wall thickness are discussed. The principle of operation of a unidirectional primary EMA transducer is described.

On the measures that are necessary for providing the safe operation of pipeline transport with nondestructive testing facilities

The state of pipeline transport and the system for its provision with nondestructive testing facilities were analyzed. A number of measures that, in the authors’ opinion, must contribute to the operational safety and reliability of pipeline transport in Russia were proposed.

Measurement of the hysteresis characteristics of pipe steels under elastic and plastic tensile strain

The changes in the shape and characteristics of the major and asymmetric hysteresis loops of low-carbon pipe steels under the action of elastic and plastic tensile strains were studied. The hysteresis loop segments that experienced the most considerable transformations under the tension of a material were determined. The possibilities of the inspection of tensile strains by the coercive return magnetization and the magnetic field corresponding to a fixed magnetization on the descending branch of a hysteresis loop were shown.

Assessing the results of ultrasonic testing of additive manufactured parts with alternative methods

Results of ultrasonic testing of parts that are fabricated by selective laser melting are assessed using radiography and X-ray computed tomography. Peculiarities of revealing incompletefusion flaws with the above methods are considered.