Download Motion Control in Offshore and Dredging by P. Albers PDF

By P. Albers

Motion keep watch over unearths functions in lots of offshore, subsea and dredging installations. movement keep watch over is usually in accordance with a mix of mechanical-, electric- and hydraulic force platforms including regulate thoughts. The ebook offers the fundamental conception of hydraulic controls, behaviour of hydraulic fluids, hydraulic part services, parameter choices, calculation of easy hydraulic platforms and simple idea of electric drives: asynchronous vehicles with frequency drives. except the theoretical history at the force rules, many new useful functions are given at the layout of force and keep watch over innovations for the offshore and dredging undefined, for instance, the layout of the observed that needed to minimize the nostril from the Russian submarine "Kursk" earlier than it can be salvaged from the seabed. distinct awareness is given to the static and dynamic behaviour of hydraulically and electrically pushed platforms, the behaviour of suggestions regulate platforms with the remainder dynamics and accuracies that may be bought. Many examples are given of put in drives for offshore purposes, pipe tensioners, pipe dealing with gear, pipe-lay towers. targeted details is gifted on energetic and passive heave compensators for cranes, deep sea installations, entry structures suction dredgers and the layout of excessive strain gasoline gear in those systems.

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Extra resources for Motion Control in Offshore and Dredging

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When pressure fluid is introduced in the motor, both gears rotate. The motor has integral kidney-shaped inlet and outlet ports. The centres of rotation of the two gears are separated by a given amount known as the eccentricity. The centre of the inner gear coincides with the centre of the output shaft. B Principle of an internal gear or gerotor motor. C Section view of a bent axis axial piston motor type A2FM (Courtesy of Bosch Rexroth) A high torque motor is characterised by a very large stroke volume (up to about 150,000 cc/rev) but with a much more limited, lower maximum number of revolutions per minute.

This has often happened when equipment has been newly commissioned, with the result that the diameter of the cylinder tubes has permanently expanded over a short length of tube or that the bolts which fix the bottom or piston end caps to the cylinder tube have broken. 69) ρ = density of the fluid kg/m3 QT = flow through throttle m3/s For simple inertia loads, with no forces acting, the cushion needs to retard the mass M. B Exponential decay of the cylinder velocity vB with a throttle type cushion The advantage of hydraulic damping with just the throttle is that it is adjustable.

When pressure fluid is introduced in the motor, both gears rotate. The motor has integral kidney-shaped inlet and outlet ports. The centres of rotation of the two gears are separated by a given amount known as the eccentricity. The centre of the inner gear coincides with the centre of the output shaft. B Principle of an internal gear or gerotor motor. C Section view of a bent axis axial piston motor type A2FM (Courtesy of Bosch Rexroth) A high torque motor is characterised by a very large stroke volume (up to about 150,000 cc/rev) but with a much more limited, lower maximum number of revolutions per minute.

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