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A major question is the exact ship velocity to be allowed for, the determination of which is primarily an exercise in probability, balancing the economics of designing to a specified velocity against the cost of repairs after impacts at greater velocities.
Graziano et al. [9] have indeed developed an algorithm for estimating the direction a ship is heading and could also estimate the ship velocity using SAR images.
The self-propulsion computations were carried out following the procedure described in Carrica et al. [1], in which a speed controller is used to find the propeller rotational speed that results in the specified ship velocity.
Variation in anchor chain, overall cable length and its horizontal projected length has little influence upon retardation system performance, whilst the changes of sea bed friction, anchor mass, water depth, initial ship velocity and ship mass will make retardation behaviour different.
The score of the Space Fortress game was composed of four sub-scores: Control of the space ship's position; maintaining ship Velocity within a predefined range; Speed with which subjects discriminated between and responded to different types of mines; and Points for successfully destroying the fortress.
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Global nonlinear coordinate changes are introduced to transform the ship dynamics to a system affine in the ship velocities to design observers to globally exponentially estimate unmeasured velocities.
For the case of partial-state feedback, we do not require measurements of the ship sway and surge velocities, while, for the case of output-feedback, none of the ship velocities are required for feedback.
Since the ship velocities are 100 m/s (Fig. 1c), ship movements during the tsunami passing over the offshore ships (~30 min) are expected to be <10 km, which is not considered in the present study.
The ship's velocity is 5 8 knots (1 knot = 1.852 kilometers/hour).
In parallel with controlling the space ship, maintaining velocity, and handling mines and missiles, players always needed to monitor a stream of symbols for a dollar sign, whose second appearance indicates a bonus in the form of extra missiles or game points.
Usually, it is a passive equipment of a ship, which generates the control forces and moments by inflow velocity and loses its performance when the ship speed reduces.
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