Results 101 to 110 of about 4,494 (274)
Research on damage progression of drill string material based on the extended finite element method. [PDF]
Sci Prog, 2021 Ying Z, Zhanghua L, Chenxin W, Brice NF.
europepmc +1 more source
Actuation Strategies for Underwater Jet‐Propelled Soft Robots
Journal of Field Robotics, EarlyView.ABSTRACT This review article examines jet‐propulsion mechanisms in underwater soft robotic systems, focusing exclusively on physically fabricated and experimentally validated robots. Covering research published from 2013 to 2025, this study classifies and evaluates jet‐propulsion robots based on their actuation mechanisms.
Angel Kitone +3 more
wiley +1 more source
Computer simulation of a drilling bit feed rate regulator comprising of a dc motor
Известия высших учебных заведений: Проблемы энергетики, 2017 This paper considers the possibility of applying a drawworks DC motor and a magnetic powder brake as an active bit feed rate regulator. A dynamic mathemat-ical model of the DC motor is presented.
O. V. Nikulin, V. A. Shabanov
doaj +1 more source
Research on a Measurement Method for Downhole Drill String Eccentricity Based on a Multi-Sensor Layout. [PDF]
Sensors (Basel), 2021 Li H, Wang R.
europepmc +1 more source
An integrated model for drill-string dynamics
, 1999 The vibrational states experienced by the active components of a drilling assembly such as that found in the oil or gas industry are discussed in the context of an integrated mathematical model. The work is motivated by the need to understand the complex
Wang, Charles, Tucker, Robin
core
steel research international, EarlyView.This study quantifies axial and torsional long‐life fatigue (LLF) behavior of three carbide‐rich PM‐HIP tool steels, correlating LLF strength with intrinsic defect size and cleanliness, thereby extracting material‐specific mean stress sensitivities and Haigh diagrams.
Lennart Mirko Scholl +4 more
wiley +1 more source
Optimal energy transfer pipe arrangement for acoustic drill string telemetry
, 2014 Drill string acoustic telemetry is an effective transmission method to retrieve downhole data. Finite-difference simulations produce the comb-filter-like channel response (patterns of pass bands and stop bands) due to the presence of coupling joints in ...
Han, Wei Kwang +4 more
core +1 more source
Structural Concrete, EarlyView.Abstract Steel fiber reinforced concrete (SFRC) enhances the flexural capacity of flat slabs and, due to its effectiveness in statically redundant bi‐dimensional elements, represents a viable alternative to conventional reinforcement. Although numerous studies have investigated the flexural behavior of SFRC slabs with and without bonded reinforcement ...
Chiara Gaddi +2 more
wiley +1 more source
Shiyou jixieIn response to the demand for plugging old wells of CO2 gas storage under the carbon peak and carbon neutrality goals， to address the challenges of deploying wireline logging tools to the bottomhole of highly-deviated and complex-structure wells during ...
Ren Xianke +6 more
doaj +1 more source
Stability Analysis of the Rotary Drill-String
, 2014 Oil and natural gas are major energy sources for modern society. A rotary drilling system is the best known technology to extract them from underground.
Pan, Liangming
core +1 more source