259_add_Added Masses of Ship Structures.pdf - 248 5 Added Masses of Bodies Moving Close to a Free Surface 22 = n(s 22 = s=1 26 = n 66 = s=1(s j22 s=1(s

259_add_Added Masses of Ship Structures.pdf - 248 5 Added...

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248 5 Added Masses of Bodies Moving Close to a Free Surface λ 22 = n s = 1 λ (s) 22 = n s = 1 j (s) 22 m i = 1 λ 22 i s ; λ 26 = n s = 1 λ (s) 22 x s = n s = 1 j (s) 22 m i = 1 λ 22 i s x s ; λ 66 = n s = 1 λ (s) 66 + n s = 1 λ (s) 22 x 2 s = n s = 1 j (s) 66 m i = 1 λ 66 i s + n s = 1 j (s) 22 m i = 1 λ 22 i s x 2 s . In these formulas x s is the x -coordinate (the x -axis is chosen along the central line of the consist) of the center of mass of each section with respect to the origin which is chosen in the center of mass of the consist. These formulas were verified by systematic model experiments. 5.13 Added Masses of Rafts Added masses of a raft taking into account the bending effect were considered in [195]. Inertial characteristics of the raft were determined as functions of its length L , width B , and radius of curvature of its central line under bending R (or curvature κ = 1 /R ). The longitudinal axis Ox and the transversal axis Oy are chosen in the plane of the raft. Combining theoretical and experimental data one gets the follow- ing approximate formulas, which take into account the penetrability of the (unbent) raft: k 11 = λ 11 m = 1 . 3 0 . 041 0 . 0027 L B ; k 22 = λ 22 m = 1 . 3 0 . 043 + 0 . 0085 L B , where
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  • Fall '09
  • Radius of curvature

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