RULES DET NORSKE VERITAS (DNV) = STRUCTURES = - Boat Design Net

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Amended July 2011, see page 3 Rules for High Speed, Light Craft and Naval Surface Craft, January 2011Pt.3 Ch.1 Sec.2 – Page 15For transverse sections with no pronounced deadrise angle, β cg and β x may be estimated according to Fig.4.The bottom slamming pressure need not be applied to craft with no significant hydrodynamic or air cushion liftin normal operating condition; i.e. SWATH hull forms.202 Bottom slamming pressure shall be applied on elements within the area extending from the keel line tochine, upper turn of bilge or pronounced sprayrail.Fig. 3Longitudinal slamming pressure distribution factor for high speed mode slammingFig. 4Deadrise angle for round bottom section203 All craft shall be designed for a pitching slamming pressure on bottom as given below:P ------------------k 21sl tan( β x )k C 120T L= – ------------ ( kN ⁄ m 2 )a b W L ß x as in 201k ak bT L= 1 for plating= 1.1 – 20 l A /L; maximum 1.0, minimum 0.35 for stiffeners and girdersl A = longitudinal extent in m of load area= 1 for plating and longitudinal stiffeners and girders=L/40l + 0.5 (maximum 1.0) for transverse stiffeners and girders (l = span in m of stiffener or girder)= lowest service speed draft in m at FP measured vertically from waterline to keel line or extended keelline.Above pressure shall extend within a length from FP:0.1 + 0.15-------V LLV ⁄ Lneed not to be taken greater than 3. p sl may be gradually reduced to zero at 0.175 L aft of the abovelength.Pitching slamming pressure shall be exposed on elements within the area extending from the keel line to chine,upper turn of bilge or pronounced sprayrail.DET NORSKE VERITAS AS
Rules for High Speed, Light Craft and Naval Surface Craft, January 2011 Amended July 2011, see page 3Pt.3 Ch.1 Sec.2 – Page 16204 Pressure on bottom structure shall not be less than given in 500.C 300 Forebody side and bow impact pressure301 Forebody side and bow impact pressure shall be taken as, in kN/m 2 :V ⁄ L need not be taken greater than 3.A = design load area for element considered in m 2For plating A shall not be taken greater than = 2.5 s 2 (m 2 )For stiffeners and girders A need not be taken smaller than e 2 (m 2 )In general A need not be taken smaller than L B wl /1000 (m 2 )e = vertical extent of load area, measured along shell perpendicular to the waterlinex = distance in m from AP to position considered= correction factor for length of craftC L250L – L 2= ------------------------, L not be taken greater than 100m15000C H = correction factor for height above waterline to load point0.5= 1 – ------- h 0C W may be reduced according to A201h 0 = vertical distance in m from the waterline at draught T to the load pointα = flare angle taken as the angle between the side plating and a horizontal line, measured at the pointconsidered. See Fig.5γ = angle between the waterline and a longitudinal line measured at the point considered. See Fig.6= acceleration parameter:a 0C W0.7 LC L C HP sl = -------------------------- A 0.3 0.6 0.4------- V + sin γ cos( 90° – α)+L2.1 a-------------- 00.4------- V + 0.6 sin 90° – αC B L( ) x L -- – 0.4 2 a 0=3 C W V------- + CL V-------LC V=L------- , maximum 0.250αFig. 5Flare angle αCDET NORSKE VERITAS AS
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RULES DET NORSKE VERITAS (DNV) = STRUCTURES = - Boat Design Net

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