Chertov
Andriy M. Chertov, Windsor CA
Patent application number | Description | Published |
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20100242608 | ELECTRODE CAP FOR ULTRASONIC TESTING - An example electrode cap includes a bored portion of an electrode cap. The bored portion establishes a bore that extends longitudinally from one end of the electrode cap and terminates at a surface having a radius relative to the longitudinal axis. A tip portion of the electrode cap extends from the surface toward another end of the electrode cap. An example method of maintaining a focal point of an ultrasonic wave includes propagating an ultrasonic wave from a transducer through a bore and a tip portion of an electrode cap and receiving a reflection of the ultrasonic wave. The method further includes determining information about a welded area using the reflection and adjusting a radius of a surface of the electrode cap to position a focal point of the ultrasonic wave within the tip portion. | 09-30-2010 |
20130269439 | ULTRASONIC IN-PROCESS MONITORING AND FEEDBACK OF RESISTANCE SPOT WELD QUALITY - A method and apparatus for ultrasonic in-process monitoring and feedback of resistance spot weld quality uses at least one transducer located in the electrode assembly transmitting through a weld tip into an underway weld. Analysis of the spectrum of ultrasonic waves provides the operator with an indication of the size, thickness, location, dynamics of formation and quality of the spot weld. The method presents a fundamentally new physical approach to the characterization of the spot weld quality. Together with transmission mode it includes new modes of operation of ultrasonic probes such as a reflection mode and simultaneous use of transmission and reflection modes, and a new physical interpretation of the signal analysis results. | 10-17-2013 |
Maxim Chertov, Salt Lake City, UT US
Patent application number | Description | Published |
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20120305242 | METHOD FOR DETERMINING GEOMETRIC CHARACTERISTICS OF A HYDRAULIC FRACTURE - Method for determining geometric characteristics of a hydraulic fracture comprises performing a baseline seismic survey for a geological formation. A velocity model is created by combining results of the baseline seismic survey and additional geoscientific information, and seismic properties of the geologic formation are evaluated. At least one strong flat lithological reflector disposed below a planned fracture is identified. A numerical model of elastic wave propagation in the geologic formation with a fracture with given properties is created. Hydraulic fracturing is performed and after fracturing when the fracture is maintained open and pressurized seismic surveys are performed. The fracture's dimensions and shape are determined by comparing the first and the second reflected and refracted seismic signals and solving an inverse problem with the use of the numerical model. | 12-06-2012 |
Maxim Andreevich Chertov, Salt Lake City, UT US
Patent application number | Description | Published |
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20130151160 | METHOD FOR DETERMINING THE STRESS-STRAIN STATE OF A STRATIFIED MEDIUM - The disclosure is related to methods for determining a stress-deformed state of layered media having at least one fluid-filled poroelastic layer induced by fluid pressure changes and it can be used in oil & gas industry. The method comprises determining initial parameters of a layered medium and a volume-distributed loading of developed layers of the layered medium. Then a set of equations is specified including elastic balance equations for each layer and equations defining boundary conditions between the layers. Analytical solutions of the elastic balance equations for each layer are obtained and adjusted to satisfy boundary conditions between the layers. Displacements and stresses in any point of the layered medium are determined in accordance with a required approximation accuracy on basis of the adjusted analytical solutions. | 06-13-2013 |