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Offshore oil drilling model: The large portion of an offshore oil drill is a long cylinder (diameter D and length L) that lowers the drill head to the ocean bed. The water flow (velocity V) over the cylinder creates vortex shedding (eddies), which create an oscillatory force on the cylinder (FL). If the frequency of the oscillatory force and the vortex shedding (fv) is in resonance with the natural frequency of the structure (fs), large amplitude oscillations of the cylinder will occur that can destabilize and even damage the drilling equipment. Such large amplitude oscillations are called vortex-induced vibrations (VIV). A team of engineers are required to examine the VIV of their new drill design before building the full-scale prototype. How can they achieve full similarity between their model and the full-scale drilling prototype?
the following data were obtained in a resin burn-off test of an e-glass-polyester sample weight of an crucible
On a single graph, plot "Hardness" as the ordinate versus "Aging Time" as the abscissa for each aging temperature - Discuss the effect of aging time and temperature on the effect of material hardness.
a circular cylinder of tantalum with an initial diameter of 3.1 mm is fired at a target. during impact the base of the
a pistoncylinder arrangement is filled with helium gas. the gas is compressed with a polytropic process with nk. the
consider a building whose annual air conditioning load is estimated to be 120000 kwh in an area where the unit cost of
a large pipe carries steam as a two-phase liquid-vapor mixture at 1.0 mpa. a small quantity is withdrawn through a
all makers of beverages such as breweries wineries and soda makers must wash bottles before filling. a new beverage
(a) Find the angular velocity of link CD and the velocity of the pin relative to the slot in link CD. (b) Find the angular acceleration of link CD and the acceleration of the pin relative to the slot in link CD.
a large flywheel weighs 3000 kg and has a radius of gyration of 1 m. it is observed that 10 min is required for the
an automobile is found to have a natural frequency of 20 rads without passengers and 17.32 rads with passengers of mass
a balloon is to be filled from a helium tank. the tank is large and the tank pressure remains effectively constant
if ice homogeneously nucleates at -58.5oc calculate the critical radius given values of -3.1 times 108 jm3 and 25 times
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