By P. Albers
Motion keep an eye on reveals purposes in lots of offshore, subsea and dredging installations. movement keep an eye on is often according to a mix of mechanical-, electric- and hydraulic force platforms including keep watch over concepts. The e-book presents the fundamental idea of hydraulic controls, behaviour of hydraulic fluids, hydraulic part services, parameter decisions, calculation of uncomplicated hydraulic platforms and easy idea of electric drives: asynchronous automobiles with frequency drives. except the theoretical historical past at the force ideas, many new useful functions are given at the layout of force and keep watch over options for the offshore and dredging undefined, for instance, the layout of the observed that needed to lower the nostril from the Russian submarine "Kursk" prior to it can be salvaged from the seabed. targeted realization is given to the static and dynamic behaviour of hydraulically and electrically pushed platforms, the behaviour of suggestions keep an eye on platforms with the remainder dynamics and accuracies that may be acquired. Many examples are given of put in drives for offshore purposes, pipe tensioners, pipe dealing with gear, pipe-lay towers. certain info is gifted on energetic and passive heave compensators for cranes, deep sea installations, entry platforms suction dredgers and the layout of excessive strain gasoline gear in those systems.
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This ebook presents a unified number of vital, fresh effects for the layout of strong controllers for doubtful platforms. lots of the effects provided are in line with H¿ regulate conception, or its stochastic counterpart, threat delicate keep watch over thought. crucial to the philosophy of the e-book is the inspiration of an doubtful method.
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Additional resources for Motion Control in Offshore and Dredging
20) For a slenderness ratio of ( λ ) > 200 for horizontal build and or of ( λ ) > 250 for vertical build, the advice is to choose a larger diameter for the piston rod. 3 : Rm = 360 N/mm2) In the previous formulas it has been assumed that the rod is the only part that offers resistance against buckling. The housing however also has a certain rigidity, which, in practice, means that the cylinder has a larger allowable buckling load. 23) For explanation of the different units and dimensions, see preceding pages.
Due to the design of the valve, a large flow capacity is possible. This type of valve is not leak proof due to leakage via the pilot section to the spring chamber and via the outer circumference of the main piston to the return line. 2, is used to reduce the pressure in (part of) the system on the exhaust side of the valve to a certain, pre-determined, value. Here too we have so-called direct acting and pilot operated valves. As before, the direct acting valves have a limited flow capacity. 3 Chapter 2 A relieving pressure reducing valve is, for example, used when the pressure in a cylinder rises above the set value Pred of the pressure reduction valve as the piston is pushed into the cylinder.
The normal control of the piston needs to ensure that the piston comes to a low speed before the mechanical end position has been reached. In principle a cushion is constructed in such a way that a certain amount of fluid is forced through a throttle valve. This throttle can operate on a fixed or adjustable basis. A A simple but efficient cushion construction at the bottom end of a cylinder. In the figure above the piston with the cushion rod is nearly entering the cushion seat in the bottom flange.
Motion Control in Offshore and Dredging by P. Albers