The article presents results of scientific and experimental studies the authors on operation tank equipment for ultrasonic purification exhaust gases internal combustion engines designed to reduce environmental pollution. scheme device implementing principle cleaning motor vehicles is presented; obtained data coagulation processes were processed analyzed. Empirical relationships coefficient its...

In this study, we investigated a method for the non-destructive detection of cracks based on an ultrasonic transit timing method. This method is considered to be an effective means for crack monitoring over an extensive coverage area. Aluminum specimens were prepared with a range of crack sizes and subjected to a tone burst wave to investigate the relationship between crack depth and the transi...

Partial discharge (PD) in electrical equipment is one of the major causes of electrical insulation failures. Fast and accurate positioning of PD sources allows timely elimination of insulation faults. In order to improve the accuracy of PD detection, this paper mainly studies the direction of arrival (DOA) estimation of PD ultrasonic signals based on a step-by-step over-complete dictionary. The...

BACKGROUND Ultrasonic instrumentation under magnification may facilitate mobilization of screw remnants but may induce heat trauma to surrounding bone. An increase of 5°C is considered detrimental to osseointegration. The objective of this investigation was to examine the rise in temperature of the outer implant body after 30 s of ultrasonic instrumentation to the inner part, in relation to imp...

The total output power from a medical ultrasound transducer has to be measured due to various reasons but in general they are related to assessment of performance and safety of equipment. The objective of this work was to develop a primary level ultrasonic power measurement system to establish standards for ultrasonic power measurement in Thailand. This system is being set up at the National In...

With the increasing demand for high agility and fast response of high-level equipment in aerospace energy power fields, it is increasingly urgent to improve performance high-temperature wear resistance corresponding components. Ceramic-reinforced titanium matrix composites have excellent resistance, but, laser additive manufacturing, primary ceramic phase coarse, morphology difficult control, w...

For lack of the visualization of the ultrasonic detection method of partial discharge (PD), the ultrasonic detection technology combined with the X-ray visual detection method (UXV) is proposed. The method can conduct qualitative analysis accurately and conduct reliable positioning diagnosis to the internal insulation defects of GIS, and while it could make up the blindness of the X-ray visual ...

ultrasonic machining (usm) is a mechanical material removal process used to erode holes and cavities in hard or brittle work pieces by using shaped tools, high-frequency and an abrasive slurry. this paper addresses the concept and development of an expert system (es) for hard and brittle material, such as glass, quartz, diamond, carbides, semi conducting materials, ceramic and graphite which ca...