Results 31 to 40 of about 556,138 (304)
Torque & Drag Analysis Using Finite Element Method
Modern Applied Science, 2011 The calculation and analysis of torque and drag play an important role in drilling and well design. Different models (soft, stiffness, mixed and finite element) have been used to calculate the torque and drag. This paper introduces a practical FEA (Finite Element Analysis) model of the drill string which can reflect working behavior, including ...
Andrew Wu +2 more
openaire +2 more sources
The steady oblique path of buoyancy-driven disks and spheres [PDF]
, 2012 We consider the steady motion of disks of various thicknesses in a weakly viscous flow, in the case where the angle of incidence $\alpha$ (defined as that between the disk axis and its velocity) is small.
Fabre, David +2 more
core +3 more sources
Analysis and Suppression Method of Drag Torque in Wide-Speed No-Load Wet Clutch
ActuatorsUnder no-load conditions, the wet clutch of vehicles generates drag torque across a wide speed range, which increases power loss in the transmission system and significantly impacts its efficiency and reliability.
Rui Liu +5 more
doaj +1 more source
, 2010 We provide torque formulae for low mass planets undergoing type I migration in gaseous disks. These torque formulae put special emphasis on the horseshoe drag, which is prone to saturation: the asymptotic value reached by the horseshoe drag depends on a ...
Baruteau +26 more
core +1 more source
Frontiers in Energy Research, 2023 Wind power generation is considered an effective way for ships to harness wind energy, and the aerodynamic characteristics of wind turbines determine wind energy utilization and efficiency.
Huawu Zhang, Yihuai Hu
doaj +1 more source
Applied Sciences, 2023 This paper focused on the investigation of the blades for a carousel rotor of a wind turbine with a vertical axis. Cross sections of the single coherent (SC) and the dual coherent (DC) blades were compared in terms of the aerodynamic forces and ...
Marcin Augustyn, Filip Lisowski
doaj +1 more source
On the horseshoe drag of a low-mass planet. I - Migration in isothermal disks
, 2009 We investigate the unsaturated horseshoe drag exerted on a low-mass planet by an isothermal gaseous disk. In the globally isothermal case, we use a formal- ism, based on the use of a Bernoulli invariant, that takes into account pressure effects, and that
Baruteau +10 more
core +1 more source
Research on drivability control in P2.5 hybrid system
Energy Reports, 2021 The control of drivability in this paper contains the clutch start, the engine and motor anti-jerk control during tip in and tip out. First, the fast clutch start is divided into five phases as well as the smooth clutch start: the gear selection phase ...
Junchao Jing +5 more
doaj +1 more source
Measurement of the total optical angular momentum transfer in optical tweezers [PDF]
, 2006 We describe a way to determine the total angular momentum, both spin and orbital, transferred to a particle trapped in optical tweezers. As an example an LG02 mode of a laser beam with varying degrees of circular polarisation is used to trap and rotate ...
Heckenberg, Norman R. +4 more
core +2 more sources
Platform, a Journal of Engineering, 2020 Different locations and field conditions require various drilling methods to produce oil and gas. Three major operational methods are identified to be slim holes, conventional and casing drilling.
Davood Zivar +3 more
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