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...

Ultrasonic crack detection and sizing is an essential tool in determining the asset integrity of pressure vessels and piping. Conventional UT shear wave methods have proved to be time consuming, requiring high skill levels and frequently resulting in unreliable and inconsistent data. Phased array UT technology can provide novel solutions to these problems with reliable results, imaging of the c...

The work is devoted to an experimental study of the main parameters acoustic flow that occurs in a liquid under influence ultrasound source (US) with frequency 1.7 MHz. To type emerging currents, method tracer and fluorescence imaging was used; distribution relative pressure found using vibration sensor; measure intensity cavitation events, thermocouple measurements were used. Experiments have ...

Single-crystalline α-Cr 2 O 3 layers were synthesized on a sapphire substrate with basal orientation in laboratory reactor using ultrasonic-assisted chemical vapor deposition the temperature range of 700-850 o C. The influence growth structural quality layer was studied by X-ray diffraction. At 800 C, continuous thickness about 1 μm obtained. transparent visible region slightly greenish tint an...

Currently, most of the biodiesel is produced from vegetable oils and methanol in the presence of base catalysts using mechanical stirring method at temperature 50-65C. This method consumes much energy because oils and methanol must be heated up to desired temperature, and also requires rather long reaction time. Ultrasound-assisted reaction can reduce the reaction time much shorter than mechani...