The report analyzes the effects of local water movement on the output of sensors that measure ship's speed relative to water. The four water disturbances considered are surface waves, internal waves, turbulence, and vertical gradients of currents. The effects range from quasi-periodic variations in the indicated speed caused by wave motions to offset errors caused by current changes with depth. The quasi-periodic variations cause difficulty in averaging and sampling the water speed for use in other ship's systems. It is concluded that local water movement does limit the useful accuracy of ship's water speed sensors. Evaluating the magnitude of this limit for any particular ship and sensor and determining the controlling factor will require careful analysis of the specific case and at-sea experimentation to confirm the results. (Author)


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen


    Exportieren, teilen und zitieren



    Titel :

    Ship's Speed-Measurement Uncertainties Caused by Localized Water Movements


    Beteiligte:
    D. R. Laster (Autor:in)

    Erscheinungsdatum :

    1973


    Format / Umfang :

    33 pages


    Medientyp :

    Report


    Format :

    Keine Angabe


    Sprache :

    Englisch





    Economizer increases ship's speed

    Engineering Index Backfile | 1929


    Ship's speed measurement with aid of Decca navigator system

    Verstelle, J.T. / Wepster, A. | Engineering Index Backfile | 1955


    Ship's log and speed indicator

    Shimizu, S. | Engineering Index Backfile | 1929


    Ship's water supply

    British Library Online Contents | 1997