1、BSI BS+74b7 91 Lb24bb7 043b654 411 = BRITISH STANDARD Specification for Symbols for computer applications in ship building and marine technology BS 7467 : 1991 IS0 7463 : 1990 - BSI BSU74b 91 Lb24bb 043bb55 358 BS 7467 : 1991 Committees responsible for this British Standard The preparation of this B
2、ritish Standard was entrusted by the General Mechanical Engineering Standards Poiicy Committee (GME/-) to lchnical Committee GME/32, upon which the following bodies were represented: British Marine Equipment Council British Maritime lchnology British Motor Ship Owners Association British Waterways B
3、oard Department of Transport (Marine Directorate) General Council of British Shipping Lloyds Register of Shipping Ministry of Defence North East Coast Insitution of Engineers and Shipbuilders Shipbuilders and Shiprepairers Association This British Standard, having been prepared under the direction o
4、f the General Mechanical Engineering Standards Poiicy Committee, was published under the authoritv of the Standards Board Amendments issued since publication and comes into effect on 31 July 1991 Amd. No. I Date I kxt affected o BSI 1991 The following BSI references relate to the work on this standa
5、rd: Committee reference GME!32 Draft for comment 86/76070 DC ISBN O 580 19910 X BS 7467 : 1991 Contents page Committees responsible Inside front cover National foreword ii Specification 1 Scope 1 2 Normative reference 1 3 Derivation of symbols 4 Standard symbols 1 2 Annex A A.l General A.2 Geometry
6、of ship and propeller A.3 Resistance and propulsion lhbles of Roman character set symbols 3 3 7 12 A.4 Seakeeping and manoeuvrability 20 A.5 Strength of structures 25 A.6 Vibration 28 A.7 Notes 29 BSI BSt7467 91 1624669 O436657 120 BS 7467 : 1991 National foreword This British Standard has been prep
7、ared under the direction of the General Mechanical Engineering Standards Policy Committee. It is identical with IS0 7463 : 1990 Shipbuilding and marine structures - Symbols for computer applications, published by the International Organization for Standardization Cross-reference international standa
8、rd British Standard IS0 1539 : 1980 (ISO) . BS 7146 : 1990 Memorandum on the standardization of the programming language FORTRAN (Identical) Compliance with a British Standard does not of itself confer immunity from legai obligations. ii BSI BSX74b7 92 2624669 043bb58 Obi W INTERNATIONAL STANDARD IS
9、0 7463 : 1990 (E) Shipbuilding and marine structures - Symbols for computer applications 1 Scope This International Standard specifies symbols for dimensional quantities used in shipbuilding and related branches of marine technology for use in computer applications where the available character set
10、is restricted. The symbols are capable of being represented using the 26 alphabetic and 10 numeric characters of the standard FORTRAN character set (see IS0 1539) and are also within the scope of International Alphabet No. 2 (A121 of the International Telecommunication Union. Examples of application
11、 of the symbols may be as names of variables in computer programs and as abbreviations in output listings. This International Standard specifies the symbols to be used but does not attempt to provide definitions for the quantities represented. The notes and formulae in the columns headed “Explanatio
12、n“ in the tables of symbols presented in annex A are provided as guidance to the application of the symbol. The use of standard symbols does not absolve authors from the need to define the quantities concerned. 2 Normative reference The following standard contains provisions which, through reference
13、 in this text, constitute provisions of this International Standard. At the time of publication, the edition indicated was valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most r
14、ecent edition of the standard indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. i S O 1 539 : 1 980. Programming 1 angoages - FOR TRAN. 3 Derivation of symbols 3.1 Origin The symbols are based on a list approved by the International Towing Tank Co
15、nference (ITTC), Ottowa, 1975, and a related list produced by the International Ship Structures Congress (ISSC), in 1974. In the few instances where it has been necessary to remove incompatibilities between the two lists, preference has been given to the ITTC symbols for subjects A.l and A.4 and to
16、the ISSC symbols for subjects A.5 and A.6 (see annex A). 3.2 General principles The following general principles have been applied in as- sembling the symbols. a) Only those alphabetic and numeric characters which are common to the character sets in clause 1 are used in the construction of symbols.
17、b) alphabetic characters. No distinction is made between upper and lower case c) Punctuation and other special characters are not used. d) Every symbol begins with an alphabetic character e) No symbol contains more than five characters, in- cluding subscripts. f) possible, consistent with the avoida
18、nce of ambiguity. Symbols which are frequently used are kept as short as g) The same symbol is not used to represent different quantities within closely related areas of application. Where practicable, the symbols for the restricted character set are related to the symbols commonly used for the quan
19、tities concerned as adopted by the ITTC and ESC. The following conventions are employed. a) Where the usual symbol incorporates a Greek letter, the name of the character is spelled out, sometimes in abbreviated form. b) Subscripts and indices are suffixed to the main symbol on the same line and with
20、out spacing or parenthesis. c) The Froude “circular“ symbols are represented by the prefix CIRC. di The suffix M or S may be added to any symbol to distinguish between the values for model or ship respectively. Consistency with established symbols is considered more important than compatibility with
21、 the FORTRAN convention which reserves names beginning with I, J, K, L, M and N for integer variables. It is therefore suggested that programmers should prefix symbols which conflict with the convention with a suitable character. 1 BSI BS*7467 91 m Lb24669 0436659 TT3 IS0 7463 : 1990 (E) In maintain
22、ing the relationship with established symbols it has been necessary to make use of both the alphabetic character O and the numeric O hero). It is therefore necessary to ensure that printers used for output in which the symbols appear make a clear distinction between the forms of these two characters
23、. 4 Standard symbols The symbols are presented in annex A which forms an integral part of this International Standard. They are grouped under the following subject headings : A.l General A.2 Geometry of ship and propeller A.3 Resistance and propulsion A.4 Seakeeping and manoeuvrability A.5 Strength
24、of structures A.6 Vibration The first column in the tables gives the Restricted Character Set symbol (R.C.S.). The second column, under the heading “Usual symbol“, gives the symbol approved by the International Towing Tank Confer- ence or the International Ship Structures Congress for use in ordinar
25、y letter-press work. In some instances an alternative is included. The English name of a Greek letter is given in par- enthesis at its first occurrence. The third column gives the name or descriptive title of the quantity represented by the symbol. Where clarification is considered necessary this is
26、 given under the heading “Explanation“ in the fourth column. For further clarification, the dimensions of the quantity are stated in the final column. Within the subject headings the quantities are arranged in alphabetical order of the usual symbol, the Greek alphabet following the Roman. 2 BSI BS*7
27、4b7 9% W i1624669 0436660 715 IS0 7463 : 1990 (E) Annex A ( norma tive) Tables of Roman character set symbols NOTE - Symbols are classified by subject; they are arranged alphabetically within a given classification. A.l General R.C.S. symbol ACC A AT B CO VWG C D E FC F CQF G DE H HBL HT HQF HK SK L
28、 LW MA M Usual symbol a A AT B C CG C D, d E f F F g h h H H HE k Ks L Lw, A (lambda) m M Title Linear acceleration Area in general Cross-sectional area of an experiment tank or tunnel Breadth in general Velocity of sound Group velocity of waves Coefficient Diameter in general Energy in general Fric
29、tion coefficient Force in general Entrainment factor Acceleration due to gravity Depth in general Head, pressure, in general Boundary layer shape parameter Total head, Bernoulli Entrainment shape parameter Roughness height or magnitude Sand roughness Length in general Wavelength Mass Moment in gener
30、al Explanation dvldt Ratio of tangential force to normal force between two sliding bodies or planes 1 - dQ/ the positive z-axis is vertically up- wards, and the x-axis lies in the general direction of initial motion Elongation per unit length per degree change in temperature dwidt Weight of a substa
31、nce divided by the weight of an equal volume of distilled water at 4 OC Strength per length or per area of vortex distribution Vds along a closed line When Fis a function of time given by ole Shear stress per unit velocity gradient de Mass per unit volume Dimensions L-2 MT -2 LMT -2 L L - T -2 - - -
32、 LZT- L - L L L - L3 T-* L-1 MT -1 LT- ML-3 5 IS0 7463 : 1990 (E) symbol RHOP CAPC TAUW POTF PHIR PHI PHI0 STR F PSIY OMG OMGO Usual symbol P o (sigma) rW (tau) (phi) 9 9 90 (psi) w o (omega) 00 Title Propeller mass density Capillarity constant Hydrodynamic shear stress at a wall Potential function,
33、 such as velocity potential Angle of roll, heel or list (Positive starboard side down) Phase difference Phase angle, according to Stream function cos(ot + 40) Angle of yaw, heading or course (Positive bow to port) Angular velocity or circular frequency Natural circular frequency Explanation Propelle
34、r mass per unit volume Surface tension per unit length y = constant is the equation of a stream line Angle per unit time Dimension: ML-3 MT -2 L- MT -2 L* T-1 - - - L3 T- - T-1 T-1 6 ES1 BS*74b7 91 Lb24bb 0436664 360 IS0 7463 : 1990 (E) A.2 Geometry of ship and propeller R.C.S. symbol ABL ABT AD AE
35、AM AO AP AR ATR AV AW AX XAB XAF KAG BF B B EIRCB ZBM ZBML 3WL 2H Usual svmbol Title Area of ram bow in longitudinal plane Area of transverse cross-section of a bulbous bow (full area port and starboard) Developed blade area Expanded blade area Area, midship section Disc area Projected blade area Ar
36、ea of rudder Area of transom (full area port and starboard) Area exposed to wind Area, waterplane Area, maximum transverse section Longitudinal centre of buoyancy from aft perpendicularz) Distance of centre of flotation from aft perpendicularz) Longitudinal centre of gravity from aft perpendicular21
37、 Span of an aerofoil or hydrofoil Beam or breadth, moulded, of ship Position of centre of buoyancy on drawing R. E. Froudes breadth coefficient Metacentre above centre of buoyancyz) Longitudinal metacentre of buoyancy21 Breadth on waterline Chord length of an aerofoil or hydrofoil Explanation The ar
38、ea of the ram projected on the middle line plane forward of the fore perpendicular The cross-sectional area at the fore perpendicular. Where the waterlines are rounded so as to terminate on the fore perpen- dicular, AB is measured by continuing the area curve forward to the perpen- dicular, ignoring
39、 the final rounding 1) Developed blade area of a screw pro- peller outside the boss or hub Expanded blade area of a screw pro- peller outside the boss or hub Midway between fore and aft perpen- diculars 0214 Projected blade area of a screw pro- peller outside the boss or hub Cross-sectional area of
40、transom stern below the load waterline Projected area of portion of ship above waterline Distance of centre of buoyancy from aft perpendicular Distance of centre of gravity from aft perpendicular Tip to tip or support to tip when canti- levered BIV 113 Distance from the centre of buoyancy 6 to the t
41、ransverse metacentre M Dimensions 1 I See A.7, note 1. 2) See A.7, note 2. 7 ES1 BSj74b7 91 3624669 043bbb5 2T7 I R.C.S. symbol IS0 7463 : 1990 (E) Usual symbol Title Explanation Dimensioi The expanded or developed area of a propeller blade divided by the span from the hub to the tip VILBT CHM L - C
42、B CBW Block coefficient (e.g. referring to LWL and BWL) CIL V LIWL) BI, T CWIT Prismatic coefficient, vertical Design load waterline coefficient CVPI v CM VIA, T - AwlLB 1- CP C PA AxIBT where B and Tare measured at the position of maximum area VIL3 CPE - - CPF CPR cs CVP CWP cx CVOL DH DP DEP CABL
43、CABT FM CATR FREB F CIT C,D (beta) Mean chord length Block coefficient I * ILIBL3 Coefficient of inertia of waterplane, longitudinal Coefficient of inertia of waterplane, transverse Midship section coefficient (midway between forward and aft perpen- diculars) 12 IT1 B3L I CP84 I Longitudinal prismat
44、ic coefficient 1) I VIAx L (or VIAM L I cPA #A 1 Prismatic coefficient, afterbody) Prismatic coefficient, entrance) Prismatic coefficient, forebody 1) Prismatic coefficient, run 1) Wetted surface coefficient V (afterbody)/h Ax L (or V (afterbodyll1I2 AM L) V (entrance)lAx LE (or V (entrancellAMLE) V
45、 (forebodyll1I2 AxL (or V (forebodyIl1/2 AML) V (run)/AxLR (or V (runlAM L,) SIJiT CX CV d D D fBL fBT fT F F Maximum transverse section coefficient Volumetric coefficient Boss or hub diameter Diameter of a propeller Depth, moulded, of a ship hull Longitudinal area coefficient for ram bow Taylor sec
46、tional area coefficient for bulbous bow Camber of an aerofoii or hydrofoil Sectional area coefficient for transom stern Freeboard Position of centre of flotation (centroid of waterplane) on drawing Maximum separation of median and nose-tail line From the freeboard markings to the freeboard deck, acc
47、ording to official rules 1) See A.7, note 3. 8 BSI BSr7467 91 3624669 043bbbb 133 m R.C.S. symbol XFB XFG G GM GML GAP GZ HO ENTA RAKG RUNA RAKS RAKT IL IP IT K ZKB ZKG ZKM ZKML Usual symbol - FB - FG G GM - - GML Gz h0 - GZ i, G i, S i, IL I, IT K KB - - KG - KM - KML Title Longitudinal centre of b
48、uoyancy from forward perpendicular 1) Longitudinal centre of gravity from forward perpendicular 1) Position of centre of gravity on drawing Metacentric height 1) Longitudinal metacentric height 1) Gap beniveen the propeller blades Righting arm or lever Immersion Angle of entrance, half Rake Angle of
49、 run, half Skew-induced rake Total rake Longitudinal moment of inertia of waterplane Polar moment of inertia Transverse moment of inertia of water- plane Keelpoint on drawing Centre of buoyancy above moulded base or keel 1) Centre of gravity above moulded base or keel 1) Transverse metacentre above moulded base or keel 1) Longitudinal metacentre above moulded base or keel 1) IS0 7463 : 1990 (E) Explanation Distance of centre of buoyancy from forward perpendicular Distance of centre of gravity from for- ward perpendicular Distance from the centre of
