The stability and oscillatory motions of ships (automatically steered and unsteered) in the horizontal plane were examined on a digital computer for the case of the regular following seas. Available hydrodynamic data for Series 60 hull forms were used. Analysis of directional stability was made for the case of zero encounter frequency (i.e., the ship runs at high speeds equal to the wave celerity). The ship (which is hydrodynamically stable without automatic control in calm water) is directionally unstable in the following seas except for the small region near the ascending node of the waves. Addition of automatic control can give the ship directional stability when it is located on the wave trough, but not when it is located on the wave crest. At relatively high frequency (i.e., at low speeds in following seas), the rudder and control system are almost incapable of reducing oscillatory motion. Violent rudder activity in following seas can be decreased by reducing yaw-rate-gain control constant and by increasing rudder-response-time constant. (Author)


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    Titel :

    Steering Control of Ships in Waves


    Beteiligte:
    H. Eda (Autor:in)

    Erscheinungsdatum :

    1967


    Format / Umfang :

    57 pages


    Medientyp :

    Report


    Format :

    Keine Angabe


    Sprache :

    Englisch




    Steering ships

    Hammes, A.D. | Engineering Index Backfile | 1952


    Ships with remote steering control

    Engineering Index Backfile | 1920


    Electric steering control of ships

    Engineering Index Backfile | 1905


    Directional stability and steering of ships in oblique waves

    Korvin-Kroukovsky, B.V. | Engineering Index Backfile | 1961


    Steering characteristics of ships in calm water and waves

    Eda, H. / Crane, Jr., C.L. | Engineering Index Backfile | 1965