BS ISO 13643-5:2017 pdf download

BS ISO 13643-5:2017 pdf download.Ships and marine technology — Manoeuvring of ships — Part 5: Submarine specials
1 Scope
This document defines symbols and terms and provides guidelines for the conduct of tests to give evidence about the manoeuvring ability in the vertical plane of submarines and models. It is intended to be read in conjunction with ISO 13643-1.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 13643-1:2017, Ships and marine technology — Manoeuvring of ships — Part 1: General concepts,quantities and test conditions
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
3.1 meander test
manoeuvring test to establish a submarine’s manoeuvring characteristics and to verify the submarine’s dynamic stability in the vertical plane
3.2 vertical overshoot test
manoeuvring test to determine the effectiveness of the stern planes when initiating and terminating changes of depth
3.3 neutral level flight test
manoeuvring test to determine the trim angle and the hydroplane angles at which the submarine maintains a constant dived depth at any given speed during submerged operation
Note 1 to entry: Neutral level flight is obtained
— for submarines with retracted bow planes by using a definite trim angle and a definite angle of stern planes, and
— for submarines with non-retractable bow planes, by using definite angles of the bow and stern planes for arbitrary trim angles (preferably θ S = 0°).
6 Test 5.1 — Meander test
6.1 Description
A series of tests for different initial speeds shall be conducted since damping and time constants of the motion of the submarine are speed-dependent, and a boat that proves to be stable at low speeds may become unstable at higher speeds. For safety reasons, the series of tests shall be commenced with a low initial speed, V 0 . The submarine shall approach on a steady speed, V 0 , before commencing the test. During the test, the propulsion plant settings shall remain unaltered and the heading kept as constant as possible. Heading and rudder movements shall be recorded throughout the test (ideally, at intervals of 1 s). If the submarine is equipped with planes acting simultaneously in the horizontal and the vertical directions (e.g. X-planes), these planes should be controlled in such a way that a steady heading is maintained as a matter of priority.