| This paper proposes a robust feature tracker based on an eecient outlier rejection scheme, suitable for feature tracking in subsea video sequences. We extend the Shi-Tomasi-Kanade scheme by introducing a technique for rejecting spurious features. We employ a simple and ee-cient outlier rejection rule, called X84, and prove that its theoretical assumptions are satissed in the feature tracking ...

This paper presents the design and performance evaluation of communication and video system for a multi-legged subsea robot which can work in shallow and strong tidal current and high turbidity environment by crawling sea floor. The design keys are hierarchical network structure based on Gigabit Ethernet and full digital video transmission. Especially, the digital video transmission can minimiz...

Buckling damage is one of the biggest safety issues for subsea pipelines. behaviors pipeline with integral buckle arrestors under external pressure are studied experimentally and numerically herein. Pressure chamber tests four full-sized identical thickness different diameters presented. An emerging vector form intrinsic finite element method (VFIFE) introduced to simulate whole buckling proces...

One of the problems risk analysis complex engineering systems is uncertainty initial information about time and damage associated with occurrence development situation. The paper proposes a methodology procedure for constructing tree, loading it data, calculating corresponding characteristics: distributions to reach intermediate main events them damages, as well their moments. Methodology invol...

Multiphase flows are of paramount importance in the oil and gas industry, considering that most petroleum industries produce transport simultaneously. However, systematic research on pipeline leakage conveying more than one phase at a time is lacking attention. In this work, numerical method proposed to investigate effect two-phase gas-liquid leak flow behaviour subsea natural pipeline. The res...

Buckle-initiation techniques, such as sleepers, are usually installed to trigger lateral buckling at pre-designated locations release the axial compressive forces induced by thermal loading. Taking nonlinear pipe–soil interaction model into account, a mathematical is proposed investigate of subsea pipelines triggered sleeper. The numerical solution validated comparing with solutions in literatu...

The geotechnical design of partially mobile subsea foundations (mudmats) for pipeline/flowline end terminals (PLETs) is presented in this paper. A mudmat represents a fit-for-purpose engineering solution that has significant commercial competitiveness. lies between fully anchored (which designed negligible movements but may be too large, causing installation issues or requiring corner piles to ...

This study examines conductive noise in long distance cables in a subsea environment. The conductive noise was caused by impedance mismatch between cables and appeared in the form of transient voltages. In particular, it is important to analyze the characteristics of transient voltages for different subsea temperature changes. To analyze the transient voltages, the effects of L, R, and C for di...