Pt B, Ch 1, Sec 23.5 Breadth3.5.1 The moulded breadth B, in m, is the greatest mouldedbreadth measured amidships below the weather deck.3.5.2 The breadth B WL , in m, is the greatest mouldedbreadth measured amidships at full load waterline. For catamarans,B WL is the breadth of each hull.3.6 Depth3.6.1 The depth D, in m, is the distance measured verticallyon the midship transverse section, from the moulded baseline to the top of the deck beam at side on the uppermostcontinuous deck.3.7 Draught3.7.1 The full load draught T, in m, is the distance, measuredvertically on the midship transverse section, from themoulded base line to the full load waterline.In the case of ships with a solid bar keel, the moulded baseline is to be taken as defined in [3.1].3.8 Lightweight3.8.1 The lightweight, in t, is the displacement withoutcargo, fuel, lubricating oil, ballast water, fresh water andfeed water, consumable stores, passengers and crew withtheir effects, but including liquids in piping.3.9 Deadweight3.9.1 The deadweight is the difference, in t, between thedisplacement, at the summer draught in sea water of densityρ = 1,025 t/m 3 , and the lightweight.3.10 Wave characteristics3.10.1 The wave height C W , in m, is the height crest-totroughof the wave. This wave height is used only for scantlingcalculation purpose.3.10.2 The wave height H S , in m, is the significant waveheight (H 1/3 ) of the considered sea-state.Figure 1 : Ends and midship3.10.3 The wave lenght L W , in m, is the distance betweentwo consecutive crests of the wave. This wave length is usedonly for scantling direct caculation purpose.3.11 <strong>Design</strong> vertical acceleration3.11.1 The design vertical acceleration at LCG, a CG(expressed in g), is to be defined by the designer and correspondsto the average of the 1 per cent highest accelerationsin the most severe sea conditions expected, in addition tothe gravity acceleration.3.12 Freeboard deck (m)3.12.1 The freeboard deck (m) is defined in Ch 2, Sec 2,[2.2.1].3.13 Bulkhead deck3.13.1 The bulkhead deck is the uppermost deck up towhich the transverse watertight bulkheads are carried.3.14 Superstructure3.14.1 The superstructure is defined in Ch 2, Sec 2, [2.2.2].3.15 Superstructure deck3.15.1 A superstructure deck is a deck forming the upperboundary of a superstructure.4 Reference co-ordinate system4.14.1.1 The ship’s geometry, motions, accelerations and loadsare defined with respect to the following right-hand co-ordinatesystem (see Fig 2):• Origin: At the intersection among the longitudinal planeof symmetry of ship, the aft end of L and the baseline• X axis: Longitudinal axis, positive forwards• Y axis: Transverse axis, positive towards portside• Z axis: Vertical axis, positive upwards.4.1.2 Positive rotations are oriented in anti-clockwisedirection about the X, Y and Z axes.Figure 2 : Reference co-ordinate systemAEMidshipFEZXYL/2 L/2LA E72 Bureau Veritas Rules for Yachts July 2006 with February 2008 Amendments
Pt B, Ch 1, Sec 4<strong>SECTION</strong> 4CALCULATION PROGRAMMES1 General1.1 Application1.1.1 The present Section deals with the various calculationsoftware developed by Bureau Veritas to help checkingthe requirements of the present Rules.1.1.2 The list of software is given hereafter, together withtheir main purpose and scope of application.Application for these software is to be transmitted to the followinginternet address:• MarinesoftwareMail@bureauveritas.comInformation can also be found on the following web site:• http://www.veristar.com2 Software2.1 STEEL2.1.1 This software allows any type of 2D or 3D beamanalysis, for metallic structure.It includes user-friendly pre-processing for the modellingand post-processing for the bending moments, shear forces,and resulting stresses analysis.Curved beams may easily be modelled and calculated,using dedicated pre-processing developed separately.2.2 COMP 20002.2.1 This software allows the detailed strength analysis ofany type of composites panel or stiffeners, and calculationof strength characteristics of hull girder transverse section,according to Part B, Chapter 9 and to Part B, Chapter 12.It includes the failure criteria to be considered.2.3 MARS2.3.1 Using the appropriate sub-routine, this softwareallows the calculation of geometrical characteristics of anytransverse section of yachts made of metallic materials.July 2006 with February 2008 Amendments Bureau Veritas Rules for Yachts 75
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