Improvements in or relating to control apparatus for ship stabilizers

摘要

1,035,065. Stabilizing ships. MUIRHEAD & CO. Ltd. April 1, 1965 [June 19, 1964], No. 25576/64. Heading B7M. Control apparatus for a ship stabilizer includes a gyroscope 1 (Fig. 1, not shown), which is sensitive to the angular velocity of the ship when rolling and mechanically coupled to opposite ends of a lever 25 whereby a rod or arm 27 connected to the stabilizer produces a mechanical signal constituted by a combination of a first mechanical signal proportional to said velocity and a second mechanical signal derived therefrom so as to be proportional to the angular acceleration of the ship, the signal given by the arm 27 having a leading phase-relationship with respect to the second mechanical signal (Fig. 2, not shown). The gyroscope has its axis of rotation in a horizontal plane and orientated athwart the ship, precession of the gyroscope about a vertical axis 2 within a fixed structure 3 being restricted to an angle of one degree by tension springs 4, 41, 7, 71. A free or floating lever 8 is pivotally connected at an intermediate point 22 to the gyroscope and one end of the lever 25 by a linkage system 9, 20, 23, 24. One end of the lever 8 is connected to an eddycurrent disc-brake 14, 15 by a link 16, a pivoted arm 10, and gearing 12, 13, whereas the other end is pivotally connected to a lever 17 which is biased by tension springs 19, 191 and coupled to the other end of the lever 25 by a link 26. The brake applies a load to the associated end of the lever 8 in proportion to the speed of the link 9 when the ship is rolling, whereby the displacement of the link 26 is proportional to the angular acceleration whilst the displacement of the link 24 is proportional to the angular velocity. The arm 27 is pivotally attached to the lever 25 at one of a plurality of points 28 according to the desired phase-relationship between the signal produced by the link 26 and that produced by the arm.