Abstract The experimental work of this study deals with the performance pipe in sand various responses subjected to incremental static loading where backfill is reinforced two types reinforcement (geogrid and geocell) investigate effects cover. pipes considered are installed different densities; i.e., loose, medium dense sand, a constant burial depth (2D, D diameter). It was concluded that maxi...

In this paper, the dynamic stability analysis of a simply supported beam carrying a sequence of moving masses is investigated. Many applications such as motion of vehicles or trains on bridges, cranes transporting loads along their span, fluid transfer pipe systems and the barrel of different weapons can be represented as a flexible beam carrying moving masses. The periodical traverse of masses...

Automated ultrasonics is steadily becoming the standard method of inspection of pipeline girth welds throughout the world. In addition, old technology multiprobe systems are rapidly being replaced by newer phased arrays. Olympus NDT developed the first phased array system a decade ago, which proved to be much more flexible and capable than multiprobe systems, particularly for offshore special a...

A marine ecosystem model seeded with many phytoplankton types, whose physiological traits were randomly assigned from ranges defined by field and laboratory data, generated an emergent community structure and biogeography consistent with observed global phytoplankton distributions. The modeled organisms included types analogous to the marine cyanobacterium Prochlorococcus. Their emergent global...

The vortex-induced vibration and solid-structure impact of a neutrally buoyant horizontal flexible pipe in the vicinity bottom wall boundary are experimentally investigated water flume. with an aspect ratio 87 is arranged oblique angle 30° initial gap-to-diameter 0.5. A non-intrusive measurement two high-speed cameras employed to simultaneously capture spatial-temporal displacements both inline...

Vorticity control is employed by marine animals to enhance performance in maneuvering and propulsion. Studies on fish-like robots and experimental apparatus modelling rigid and flexible fins provide some of the basic mechanisms employed for controlling vorticity.