An ultrasonic welding system typically consists of four components: power supply, PZT converter, booster and horn. Among them, PZT converter converts electrical power into mechanical power. To improve the power delivery, the input electrical impedance of converter should be reduced. In the present study, influences of piezoelectric ring thickness and thickness of matching and backing layers on ...

introduction: in this study, a computer analysis method based on a block matching algorithm is presented to extract the longitudinal movement of the carotid artery wall using consecutive ultrasonic images. a window (block) is selected as the reference block in the first frame and the most similar block to the reference one is found in the subsequent frames. material and methods: the program was...

Fixture design is critical to the development of a mesoscale machining system capable of yielding micro-size features with high accuracies. A reconfigurable, intelligent fixturing system with embedded sensors is required (i) to fixture a large group of similar workpieces with minimal set-up changes, (ii) to sense the location of the workpieces placed on the fixture, (iii) monitor clamping force...

Ultrasonic burnishing is one of several surface treatment methods. The method a relatively new process used for finishing workpieces to produce good quality. This paper presents ultrasonic as mechanical improving the quality planar plates. improves by increasing hardness workpiece and reducing its roughness. However, it essential know effect on residual stresses in material. study investigated ...

ultrasonic assisted drilling (usd) is new technique to drill difficult to machine materials. in this method, tool or workpiece vibrates with amplitude of few microns in addition to conventional drill bite rotation. in this experimental research, the bone was drilled both conventionally and using uad, then the thrust was measured in two methods at feed rates of 50, 75 and 125 mm/s and 500, 710 a...