The disadvantages arising during assembly of threaded joints are considered. existing methods improving the quality a joint analyzed and most promising one is identified - use ultrasound at stage. Dependence unscrewing moment on main technological parameter, which vibration amplitude obtained.

Abstract Quartz crystals are found in nature. It is believed that these eco‐friendly and known for healing, decoration, gem therapy. However, there no scientific evidence of such effects, except it a piezoelectric material. The piezocatalytic effect viewed as having significant potential tackling environmental challenges water cleaning. performance was examined reported few dyes degradation. pu...

BACKGROUND Ultrasonic motors (USM) are based on the concept of driving the rotor by a mechanical vibration excited on the stator via piezoelectric effect. USM exhibit merits such as simple structure, quick response, quiet operation, self-locking when power off, nonelectromagnetic radiation and higher position accuracy. PRINCIPAL FINDINGS A cylindrical type traveling wave ultrasonic motor usin...

Since Gavreau [1] reported that ultrasound could be perceived by bone conduction, controversial discussions have surrounded the concept of the auditory perception of ultrasound. Particular attention has been paid to its perception mechanism and to whether or not the profoundly hearingimpaired can detect ultrasound and discriminate ultrasound modulated by different speech sounds. Consideration i...

A hybrid longitudinal-torsional ultrasonic transducer is designed and fabricated in this research. The design of the transducer was performed using the FE method with ABAQUS software, with the aim of combining the longitudinal and torsional vibration modes. The transducer horn is then fabricated using a 4-axis milling machine. The PZT stacks are employed in order to excite the transducer. The t...

A hybrid longitudinal-torsional ultrasonic transducer is designed and fabricated in this research. The design of the transducer was performed using the FE method with ABAQUS software, with the aim of combining the longitudinal and torsional vibration modes. The transducer horn is then fabricated using a 4-axis milling machine. The PZT stacks are employed in order to excite the transducer. The t...