The use of high-pressure waterjets as a method for enhancing the performance of mechanical cutting tools has been well documented over the years. However, concurrent with this development for drag bit tools, there has been some evidence that the combination was not an effective one. By using sectioned samples of rock indented with a spherical indentor (of the type used in percussive drilling) t...

Real-time supply chain management, theft prevention, and environmental monitoring motivate the need for RFID systems. Battery-assisted RFID tags increase read range and reliability; however, batteries offer only a finite lifetime solution. Hence, an experiment in powering a battery-assisted passive RFID tag using ambient vibration energy was conducted. A piezoelectric power generator was design...

A two-dimensional (2-D) finite element model (FEM) has been developed to perform numerical simulations of vibration assisted machining (VAM). The model is based on an updated Lagrangian formulation, with adaptive remeshing. The model is capable of simulating the amplitude and frequency independently of the tool in the cutting (x) and thrust (y) force directions over a wide range of values. The ...

With the development of oil drilling in depth, strata are more ancient and abrasive. The Rate Penetration (ROP) is low conventional methods, Positive Displacement Motor (PDM) matching PDC bits often used to improve it. However, application excessive Weight on Bit (WOB) would easily lead PDM brake, over-standard well inclination, bit wearing aggravation other bad phenomena. Moreover, ROP improvi...

Thanks to digital twins encompassing virtual and physical models, the cutting processes under study are attractive for improving modern manufacturing processes. The aim of this work is propose an efficient method controlling higher buckling modes a vibration micro drilling tool, which allows increase efficiency technological process.

OBJECTIVE The present study was aimed at clarifying the effect of vibration syndrome (VS) on the peripheral nervous system in the lower extremities of patients with VS due to rock-drill work. METHODS Fifty-three patients with VS due to previous exposure to vibration from rock-drilling work and 55 age-matched controls were examined for sensory nerve conduction velocities in the medial plantar ...

An ordinary electric drill was integrated into a context-aware augmented reality (AR) framework to assist in timber-drilling tasks. This study is preliminary evaluation detail technical challenges, potential bottlenecks, and accuracy of the proposed object- tool-aware AR-assisted fabrication systems. In designed workflow, computer vision tools sensors are used implement an inside-out tracking t...

An anchor drilling for a coal mine support system can liberate an operator from heavy work, but will cause serious vibration, which willbe transmitted to the pedestal roof bolter along manipulator. Based on multi-level transfer path analysis (MTPA) and modal superposition method (MSM), vibration model subsystem composed of joints manipulator with six degrees freedom (DOF) was established. Moreo...