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Criteria for the Depths of Dredged Navigational Channels (1983) / Chapter Skim
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Appendix D: Description of Mathematical Model
Pages 153-162

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From page 153...
... g., draft, beam, length, minim and maximum speeds, vessel boundary layer thickness , position from centerline, maximum rudder angle, wind area, displacement, and stopping distance. Card #7 specifies the secondary vessel characteristics, if the passing condition has been specified.
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From page 154...
... D-2 Vessel Attitude 1~ Bank Suction Neutral Steering Line Boundary Layer L Data _ . two_ Main Control Squa t _ l Sa linity l 1 ;hip -Genera~ced Waves Stopping Dis tance Power Required \ ~1 -1 Area Figure D-1 Channel design evaluation model
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From page 155...
... If the channel cross-section is symmetrical, the neutral steering line is the channel centerline; if asymmetrical, the module calculates the distance from centerline to neutral steering line, adding this value algebraically to the distance from the centerline of the ship's position. These values are then used in the bank suction computations, which encompass lateral forces and moments due to bank suction effects for various speeds, using the method proposed by Schoenherr (1960~.
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From page 156...
... Comparison of computed and measured squat
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From page 157...
... 1'nbs x x U~ C~ ~D 11 ·e 0 X U' U]
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From page 159...
... 3,~nbs ~n ,' '_ m 0 cn x 0 0 U)
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From page 161...
... There are few measurement data for comparison. Stopping Power Computation Module This module computes the reverse thrusts needed to bring the vessel (sailing at selected speeds)
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From page 162...
... ~ 196 0 ) , "Data f or Estimating Bank Suction Ef f eats in Restricted Waters and on Merchant Ship Hulls, " Report 1461, David Taylor Model Basin, U
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Key Terms

  • specif ies
  • steering line
  • neutral steering
  • selected speeds
  • taylor model

  • boundary layer
  • primary vessel
  • vessel attitude
  • module computes
  • david taylor

  • model basin
  • restricted waters
  • stopping distance
  • suction module
  • computation module

  • inf ormation
  • various speeds
  • vessel speed
  • moments due
  • fled distance

  • channel section
  • characteristic coefficients
  • method proposed
  • attitude module
  • forces calculated

  • absent vessel
  • drift angles
  • channel centerline
  • value algebraically
  • title inf


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