BS 7467-1991 Specification for symbols for computer applications in ship building and marine technology《造船和航海技术用计算机应用符号规范》.pdf
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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
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