Vortex-induced vibration (VIV) can be inevitably encountered in deep ocean mining. As the internal flow is transported axially flexible riser, complicated VIV dynamics occurs undergoing both and external flows. Therefore, object here to explore effect of with different velocities densities on response under various uniform current. In this study, a semi-empirical time domain prediction method f...

А riser, which is an offshore water separation column the main difference between drilling and onshore drilling. The idea of research to calculate stressed-deformed state a riser made various materials identify technological advantages during on shelf at sea in Arctic. article result conducted Mathematica application program determine operating stresses that depend process conditions external e...

Slugging flow is a condition caused by liquid obstruction at the riser base. It exhibits cyclic behaviour. The cycle consists of protracted time no gas production riser's top, followed arrival slug with length greater than height, and ultimately breakthrough significant surge. might range from few minutes to hours, depending on system size conditions. In offshore oil production, feedback contro...

Effects of insertion of coiled wire in juxtaposition with twisted tapes on heat transfer rate and solar radiation without disturbing the flow inside the riser tubes in a solar flat plate collector is experimentally reconnoitered in this present work. The wire coil used as a turbulator is placed inside the riser tube while the twisted tape is inserted into the wire coil to create a continuous sw...

This paper develops theory behind the noise power ratio (NPR) testing of ADCs. A mid-riser formulation is used for mathematical simplicity. Simulated results, using DAC generated signals, suggests that the uniformly distributed signal is easier to implement and is more sensitive to amplitude dependent distortions.

Primary repair of pectoralis major tendon with bony tunnels and anchor sutures in the proximal humerus creates a potential weakness and stress riser leading to increased risk of periprosthetic fracture and nerve damage at the site of weakness with subsequent injury, if not allowed to heal satisfactorily with adequate period of rest.

the present sought to draw a comparison between model predictive control performance and two other controllers named simple pi and selective pi in controlling large-scale natural gas transport networks. a nonlinear dynamic model of representative gas pipeline was derived from pipeline governing rules and simulated in simulink® environment of matlab®. control schemes were designed to provide a s...

Original SPE manuscript received for review 24 July 2008. Revised manuscript received for review 11 May 2009. Paper (SPE 120040) peer approved 23 May 2009. Summary This is the second of two papers describing control experiments on a medium-scale slug rig. The first paper (Sivertsen et al. 2009) describes experiments performed on a small-scale laboratory rig built at the Norwegian University of ...

in this paper, the behaviour of buried pipelines under the effect of propagation of seismic waves and faulting is studied seperately. the stability of this type of structure was first studied by using three different methods proposed by newmark-hall, kenndey et al. and wang - yeh under the effect of ground faulting. by parametric study, the effect of soil types, size of pipeline, depth of embed...