By Subrata Chakrabarti
Large strides were made within the final a long time within the development of offshore exploration and construction of minerals.
This e-book fills the necessity for a realistic reference paintings for the cutting-edge in offshore engineering.
All the fundamental historical past fabric and its program in offshore engineering is roofed. specific emphasis is positioned within the software of the speculation to useful difficulties. It comprises the sensible facets of the offshore buildings with convenient layout publications, basic description of some of the parts of the offshore engineering and their functions.
The fundamental objective of the e-book is to supply the $64000 sensible points of offshore engineering with out going into the nitty-gritty of the particular distinctive layout.
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Extra info for Handbook Offshore Engineering vol 2
The calculation of drag coefficient for harmonically oscillating flow past a body is based on the drag force term of the Morison equation. When there is bi-harmonic flow (Le. two frequencies of oscillation), the situation is not so simple. In resolving the measured force into drag and inertia components, it is possible to define two drag (and inertia) coefficients, appropriate to either of the two frequencies of oscillation. An additional complication arises as either the wave or drift maximum velocity, or indeed the sum of the two may be used within the Morison formulation.
Alternatively, the model test results may be used. It is important that the model test or simulation is carried out over a suitable length of time to give appropriate statistical quantities. A minimum of 3 h full-scale equivalent time is specified, though usually significantly longer time is beneficial. The model testing has been addressed in detail in Chapter 13. 3 Mooring System Analysis Certification standards give guidance on the methods employed to perform the structural design of wire, chain and fibre mooring systems, including their combinations, used on floating vessels, including deep draft floaters, such as spars.
21 give dynamic tension components (total tension minus static catenary tension) for the chain (with drift amplitude and period of 10 m and 100 s respectively) and wire (with drift amplitude and period of 30 m and 330 s respectively). It is seen that a number of contributions with the wire results predict total tensions less than the catenary value. A possible reason for this is that the calculation method for catenary tension does not include stretch of the seabed portion and thus may give slightly conservative values.
Handbook Offshore Engineering vol 2 by Subrata Chakrabarti