The bottom hole assembly during the drilling process is prone to fatigue and damage under influence of alternating stress, particularly drill bit part assembly. vibration shock data are normally used estimate working status collars for post-processing a particular logging method. recent developments in technology have increased investigations into continuous information measurement. However, ex...

Microgroove structures with helical pitches in a wavelength level are increasingly required optical areas. However, conventional manufacturing techniques generate relatively high stresses during pressing, resulting poor precision when forming microgrooves. This paper reports on the mechanism of ultrasonic vibration-assisted microgroove precise hot-pressed glass. A finite element (FE) thermocomp...

To promote the application of ultrasonic vibration rock crushing technology in underground rock-drilling engineering, it is necessary to investigate damage and fracture characteristics hard under excitation vibration. In this study, brittle red sandstone was taken as research object, experiments were carried out, macrodeformation samples monitored by strain gauges. The experimental results show...

A miniaturized homodyne laser Doppler vibrometer (LDV) with a compact 90° optical hybrid is experimentally demonstrated on a CMOS compatible silicon-on-insulator (SOI) platform. Optical components on this platform usually have inadequate suppressions of spurious reflections, which significantly influence the performance of the LDV. Numerical compensation methods are implemented to effectively d...