Results 71 to 80 of about 9,104 (217)

Application of Shock Absorber based on Bit-rock Interaction

Shiyou jixie, 2022
In order to obtain the optimal parameters of shock absorber and thus reduce the downhole vibration intensity in the process of rock-breaking drilling of bit,on the basis of considering the dynamic coupling of drill string,bit and rock system,taking the ...
Hu Zhiqiang, Zhu Xiaohua, Wang He, Liang Jianlong, Yang Hancheng, Zheng Xiang   +5 more
doaj  

Influence of Ultrasonic‐Assisted Milling on Surface Integrity and Fatigue Strength of a Low Alloy Steel

Fatigue &Fracture of Engineering Materials &Structures, Volume 49, Issue 6, Page 2352-2362, June 2026.
ABSTRACT The milling process significantly influences the surface integrity of metallic components through machining induced near‐surface residual stresses. Modern hybrid machining processes, such as ultrasonic‐assisted milling (USAM), offer the potential to induce beneficial near‐surface compressive residual stresses compared to the near‐surface ...
Lorenz Engelking, Mauro Madia, Dirk Schröpfer, Julius Kruse, Romeo Saliwan Neumann, Thomas Kannengießer   +5 more
wiley   +1 more source

Helical Buckling of Drill-Strings

MATEC Web of Conferences, 2018
This paper presents experimental and numerical investigations of the complex drill-string vibration, with particular attention to the helical buckling of drill-strings and its influence on the system dynamics.
Kapitaniak Marcin, Vaziri Vahid, Wiercigroch Marian   +2 more
doaj   +1 more source

Power Losses in Energy Generation: Mechanisms, Mitigation Strategies, and Pathways to a Sustainable Future

Energy Technology, Volume 14, Issue 4, April 2026.
This article provides a comprehensive review of loss mechanisms in the generation stage of energy systems, covering fossil, nuclear, and renewable technologies. It examines their environmental and operational implications and shows how overlooking generation losses distorts efficiency assessments.
Pooya Parvizi, Alireza Mohammadi Amidi, Mohammad Reza Zangeneh, Jordi‐Roger Riba, Milad Jalilian   +4 more
wiley   +1 more source

Nanosatellite fabrication and analysis [PDF]

, 2012
The advancements in technologies used in the aerospace industry have allowed universities to experiment with and develop small-scale satellites. Universities are taking advantage of the relatively low development costs of nanosatellite programs to give ...
Harrison, Sam, Scott, Patrick, Zapien, Victor   +2 more
core   +1 more source

A Proposed Design for a Smart Shock Absorber Using an Electro-Rheological Fluid [PDF]

, 2016
This paper proposes a design for a smart down-hole shock absorber that can be used to optimize the vibrations that occur while drilling oil and gas wells. The tool reads the magnitude and frequency of vibrations resulting from the drilling process.
Alphonse Anees, Michael Anwr, Girgis, Wafik, Nooh, Ahmed, Rodríguez Monroy, Carlos   +3 more
core   +2 more sources

Nonlinear Asymmetric Blood Oxygenation Level Dependent Responses in Somatosensory Cortex

Human Brain Mapping, Volume 47, Issue 5, 1 April 2026.
BOLD responses to increments and decrements in intensity of vibrotactile stimulation were asymmetric. Negative BOLD effects (decrements in signal) were smaller in amplitude and slower to peak compared with positive BOLD responses to increases of intensity. BOLD responses were nonlinear for changes in stimulus duration and intensity.
Feng Wang, Pai‐Feng Yang, Arabinda Mishra, Li Min Chen, John C. Gore   +4 more
wiley   +1 more source

Passive targeted energy transfers and strong modal interactions in the dynamics of a thin plate with strongly nonlinear attachments [PDF]

, 2001
We study Targeted Energy Transfers (TETs) and nonlinear modal interactions attachments occurring in the dynamics of a thin cantilever plate on an elastic foundation with strongly nonlinear lightweight attachments of different configurations in a more ...
Fotios Georgiades, Alexander F. Vakakis, Den Hartog, Gendelman, Georgiades, Georgiades, Gerandin, Huang, Huang, Kerschen, Lee, Lee, Leissa, Liu, Melosh, Tsakirtzis, Tsakirtzis, Vakakis, Vakakis, Veltcheva, Zhang   +20 more
core   +4 more sources

Development of Similarity Theory-based Horizontal Well Drill String Test Apparatus

Shiyou jixie, 2016
In order to conduct research on dynamic properties of drill string in the horizontal well,a horizontal well drill string test apparatus is developed based on parameter correspondence between test model and site prototype.The parameter correspondence is ...
Ren Fushen, Liu Jianhua, Li Yang, Wang Baojin   +3 more
doaj  

Study of Radial Vibration Impact on Friction and Torque of Rotary Drill String

Shock and Vibration, 2020
During extended-reach well drilling, the torque of a rotary drill string is too large in the horizontal section, which results in the failure of the drill string.
Zifeng Li, Chaoyue Zhang, Wenming Ren, Jianwei Ma   +3 more
doaj   +1 more source