船の操縦性に就いて(2)

DOI NDLデジタルコレクション NDLデジタルコレクション 被引用文献5件

書誌事項

タイトル別名
  • On Steering Qualities of Ships (2)
  • 船の操縱性に就いて (2)
  • 船の操縦性について(2)

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抄録

This paper follows the preceding paper of the authors in 1956. Now it may be concluded that ; <BR>(1) Steering quality of a ship may be described by a transfer function of the form K (1+T3p) / (1+T1p) (1+T2p) or a set of the steering quality indices K, T1, T2 and T3. These indices are functions of hull form, rudder size and other particulars of a ship. Analytically, they are composed of coefficients of governing equations of motion.<BR>(2) In a more practical sense, steering motions of ships are described substantially by a first-order equation of motion T dθ/dt+θ=Kδ. Accordingly steering quality may be described in brief by two fundamental indices K and T.<BR>(3) Use of the transient response test and frequency response test of a free self-propelled model is an effective means of providing a full description of steering quality in terms of K, T1, T2 and T3, through a procedure not so lengthy as the usual approach of resistance derivatives.<BR>(4) Kempf's zig-zag test followed by an analysis employing the first-order equation of motion provides a figure of merit for steering qualities of actual ships in terms of K and T. The zig-zag test would bring out many things about steering quality if it were carried out for many ships.<BR>(5) Refering the values of K and T for a number of actual ships, it may be said that (a) improvement of turning ability (increase of K) brings necessarily some reduction of quick-responsibility and stability in steering (increase of T), if the relative rudder size remains constant, (b) rudder size, cut-up of dead-wood and other similar arrangement have fair effects for steering quality, while main hull form has much smaller effects for it.<BR>(6) It may be expected that the present expression of steering quality would provide a reasonable basis for design work relating to steering and turning. In this connection, consideration of a feed-back system composed of a ship, a steering gear and a helmsman or anautopilot may be an important aid.

収録刊行物

  • 造船協會論文集

    造船協會論文集 1957 (101), 57-66, 1957

    社団法人 日本船舶海洋工学会

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