Results 81 to 90 of about 8,057 (285)

Drag Reduction Control for Torsion and Oscillation in Top Drive System Slide Drilling

Shiyou jixie, 2018
The domestic technology of drag reduction control for torsion and oscillation in top drive system (TDS) slide drilling is not yet mature. The torque limit and torsion angle during drilling are still set by experience, which is inconsistent with the ...
Li Qian, Ji Guodong, Zhang Hui, Ge Yunhua, Wang Bo, Cui Meng   +5 more
doaj  

Modeling of the Dynamics of Conical Separate Plates in a Wet Multi-Disc Clutch

Lubricants
Wet multi-disc clutches in transmission systems suffer from the incomplete separation of the friction components, which raises the drag torque and results in power loss and heightened fuel consumption.
Qin Zhao, Biao Ma, Cenbo Xiong, Liang Yu, Bing Fu, Shufa Yan   +5 more
doaj   +1 more source

Emergent Spinning and Orbital Motion in Clustered Wind-Assisted Flyers. [PDF]

Adv Sci (Weinh)
Inspired by natural snowflake geometries, paper‐cut flyers exhibit geometry‐defined spinning and orbital motions during cluster formation in a wind tunnel. Collective flights of multiple paperflakes reveal dynamic clustering, fragmentation, and continuously evolving spin behaviors.
Zhou B, Chand R, Korai FA, Yang J, Savonen V, Liu F, Yang Q, Zeng H.   +7 more
europepmc   +2 more sources

New Aspects of Torque-and-Drag Modeling in Extended-Reach Wells

, 2010
The length and inclination of wells have increased significantly the past decades. The record horizontal departure today is about 11 km from the platform.
B. S. Aadnoy, S. A. Mirhaj, E.. Kaarstad, M.. Fazaelizadeh   +3 more
core   +1 more source

Field‐Driven Active Colloids as Distributed Micromachines: Bridging Physics, Control, and Function Across Length Scales

Advanced Science, EarlyView.
Field‐driven active colloids are framed as distributed micromachines in which externally supplied power, sensing, and control regulate task‐relevant states. By closing the loop between particle behavior, imaging, computation, and electric or magnetic actuation, these systems can progress from programmable motion toward adaptive functional outcomes ...
Ruchi Patel, Bhuvnesh Bharti
wiley   +1 more source

Development of Thrust, Torque, and Power Estimation Model, and Prediction Performance of Earth Pressure Balance Tunnel Boring Machine in Mixed-Face Strata

Applied Sciences
In this paper, a theoretical estimation model of TBM thrust, torque, and power in the rock–soil interface (RSI) of mixed ground is developed, including a new force model for the drag cutter that accounts for chamber pressure and soil friction.
Shufang Zhai, Yingjie Song, Hao Tian
doaj   +1 more source

Design, Control, and Clinical Applications of Magnetic Actuation Systems: Challenges and Opportunities

Advanced Intelligent Systems, Volume 7, Issue 3, March 2025.
This review aims to provide a broad understanding for interdisciplinary researchers in engineering and clinical applications. It addresses the development and control of magnetic actuation systems (MASs) in clinical surgeries and their revolutionary effects in multiple clinical applications.
Yingxin Huo, Lidong Yang, Tiantian Xu, Dong Sun   +3 more
wiley   +1 more source

Stochastic Locomotion Emerging From Body–Environment Interactions in a Mexican Jumping Bean–Inspired Robot

Advanced Intelligent Systems, EarlyView.
Inspired by the Mexican jumping bean, this study presents a centimeter‐scale, electronics‐free robot that merges principles from both the animal and plant kingdoms. A thermo‐responsive actuator mimicking larval motion, enclosed within a uniquely shaped plant‐seed‐inspired shell, generates jumping, rolling, flipping, sliding, and climbing through ...
Ragesh Chellattoan, Alessio Mondini, Edoardo Sinibaldi, Barbara Mazzolai   +3 more
wiley   +1 more source

Experimental investigation of drag loss and plate separation behavior of wet clutches under external forces

Results in Engineering
Understanding the drag loss behavior of wet clutches is crucial for the development of low-loss clutch systems. For non-horizontal installation positions and non-stationary applications, external forces caused by the inclination or vehicle dynamics act ...
Lukas Pointner-Gabriel, Simon Flamm, Max Menzel, Katharina Voelkel, Karsten Stahl   +4 more
doaj   +1 more source

Torque and Drag Friction Model: Implemented Friction Factor Dependency of Temperature [PDF]

, 2016
Master's thesis in Petroleum engineeringWe investigated the friction factor dependency of temperature. “Friction factor” is a parameter in the calculations of torque and drag. Increased well reach is dependent on accurate torque and drag modeling.
Brekke, Alexander
core