Vibration Rupture Test of Curved Pipe Regarding Aseismic Strength

Curved Arrays for Improved Inspection of Small Pipe Welds

This paper describes computer modeling and testing of phased arrays curved in the passive axis to improve focusing on small diameter pipe welds; in practice, a couple of curvatures satisfy most diameter and wall thickness applications. The modeling was followed by experimental testing using one of the curved arrays. Not surprisingly, the curved array showed significant improvements over a flat ...

Curved arrays for improved horizontal sizing in small pipe welds

In the past, most small diameter pipe welds were radiographed for defects. However, radiography has significant limitations: safety and licensing issues, disruption to work schedules, chemical wastes, and poor detection of planar defects. Manual ultrasonics was permitted by some codes, but suffers from lack of recorded data and dependence on the operator’s skills. Automated ultrasonic testing (...

Convective Heat Transfer of Nanofluids Flows Through an Isothermally Heated Curved Pipe

Vibration Test Evolution

Vibration testing is widely accepted as a method to improve product quality by identifying structural weaknesses. Historically, single axis, single shaker testing is the method of choice. This is largely due to the lack of economical and effective test hardware and control software. Significant advances have been made in both arenas, resulting in test equipment design that permits multiple shak...

3D Segmentation of Curved Needles Using Doppler Ultrasound and Vibration

A method for segmenting the 3D shape of curved needles in solid tissue is described. An actuator attached to the needle outside the tissue vibrates at frequencies between 600 Hz and 6500 Hz, while 3D power Doppler ultrasound imaging is applied to detect the resulting motion of the needle shaft and surrounding tissue. The cross section of the vibrating needle is detected across the series of 2D ...