Ship maneuvering
CHAPTER 3:
THEORIES OF SHIP MANEUVERING (SHIP
INTERACTIONS)
CAPTAIN TANAMESH PUSANASURAPUNT
Fixed Screw Propeller
Single Fixed Screw Propeller
Larger Ship
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Ship-Handling with 4 Tugs
Berthing with 5 Tugs
Ship-Handling with 4 Tugs
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0900 - 1200
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Daniel Bernoulli
ð‘Ģ2 + gz + p = Constant
2 ρ
v: Fluid Flow Speed
g: Acceleration due to gravity
z: Elevation of Point Above Reference Plane
p: Pressure
ρ: Density of Fluid
Bernoulli’s Principles
Bernoulli’s Equation
For Uncompressed Flow (Fluid)
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Bernoulli’s Equation
For Uncompressed Flow (Fluid)
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+ ð‘Ģ2 + p + gz = F(t)
2 ρ
: Partial Differentiation of Velocity ϕ at Time t
g : Acceleration due to gravity
z : Elevation of Point Above Reference Plane
p : Pressure
ρ : Density
𝜕ð‘Ķ
𝜕ð‘Ĩ
𝜕ð‘Ķ
𝜕ð‘Ĩ
Bernoulli’s Principles
Bernoulli’s Differential Equation
For Compressed/ Unsteady Flow (Gases)
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Bernoulli’s Differential Equation
For Compressed/ Unsteady Flow (Gases)
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Aerodynamic
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COASTAL AREA WHERE
SHIP INTERACTIONS OFTEN
HAPPEN
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Shallow Water Effect
Bank Effect
Shallow Water Effect
SHALLOW WATER EFFECT
(SWE)
CAPTAIN TANAMESH PUSANASURAPUNT
Shallow Water
Effects
Shallow Water
Effects
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āđ€āļĢāļ·āļ­ Braer āļ›āļĩ 1993 āļŠāļāļīāļ­āļ•āđāļĨāļ™āļ”āđŒ
āļ™āđ‰āļģāļĄāļąāļ™āļ”āļīāļš 85 āļĨāđ‰āļģāļ™āļĨāļīāļ•āļĢ āļŠāļģāđ€āļŦāļ•āļļāđ€āļāļĒāļ•āļ·āđ‰āļ™
BANK EFFECT
(BE)
CAPTAIN TANAMESH PUSANASURAPUNT
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Bank Effects
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Bank Effects
SUCTION
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SPRING OUT THE BANK
(Kicking Techniques)
Kicking
SQUAT
(SQUAT)
CAPTAIN TANAMESH PUSANASURAPUNT
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SQUAT
(Keel)
SQUAT
(Keel)
Squat
SQUAT
(Stern)
POTENTIAL SQUAT
(Stern)
SQUAT
(Bow)
āļāļĢāļ“āļĩāđ€āļĢāļ·āļ­āđ€āļ”āļīāļ™āļŦāļ™āđ‰āļē- āļ—āļĢāļīāļĄāļŦāļąāļ§
āđ€āļ›āđ‡āļ™āļŠāļ–āļēāļ™āļāļēāļĢāļ“āđŒāļ—āļĩāđˆāđ„āļĄāđˆāļžāļķāļ‡āļ›āļĢāļ°āļŠāļ‡āļ„āđŒāļ­āļĒāđˆāļēāļ‡āļĒāļīāđˆāļ‡
- āđ„āļĄāđˆāļŠāļēāļĄāļēāļĢāļ–āļ„āļēāļ”āđ€āļ”āļēāļ­āļēāļāļēāļĢāđ€āļĢāļ·āļ­āđ„āļ”āđ‰
Wind
POTENTIAL SQUAT
(Bow)
 Squat is expected when depth < 1.5 draft
 Squat value should be greater of Value provided in maneuvering data
10 % of draft
 0.3 m for every 5 knots
 Ship with CB greater than 0.75 tends to squat by head
SQUAT
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Bernoulli's Principle
Applications
SHIP INTERACTION
CAPTAIN TANAMESH PUSANASURAPUNT
Positive Pressure (+) and Positive Pressure (+)
=> Push Apart
Positive Pressure (+) and Negative Pressure (-)
=> Suction
Negative Pressure (+) and Negative Pressure (-)
=> Suction
SHIP PASSING
CAPTAIN TANAMESH PUSANASURAPUNT
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Ships Passing
SHIPS OVERTAKING
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Ships Overtaking
Ships Overtaking
Ships Overtaking
Ships Overtaking
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TURNING AT THE BEND
CAPTAIN TANAMESH PUSANASURAPUNT
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1 Possibility : Keep Inside, With Right Rudder to Bow Straight Ahead
If Aft closes to the bank, 2 Choices : Kicking Ahead, or Putting Sternway
āđ€āļĨāļĩāđ‰āļĒāļ§āļ—āļĩāđˆāđ‚āļ„āđ‰āļ‡āđāļĄāđˆāļ™āđ‰āļģāļ•āļģāļĄāļ™āđ‰āļģ
Potential Squat
1 Possibility : Keep Inside, With Right Rudder to Bow Straight Ahead
If Aft closes to the bank, 2 Choices : Kicking Ahead, or Putting Sternway
āđ€āļĨāļĩāđ‰āļĒāļ§āļ—āļĩāđˆāđ‚āļ„āđ‰āļ‡āđāļĄāđˆāļ™āđ‰āļģāļ•āļģāļĄāļ™āđ‰āļģ
Potential Squat
āđ€āļĨāļĩāđ‰āļĒāļ§āļ—āļĩāđˆāđ‚āļ„āđ‰āļ‡āđāļĄāđˆāļ™āđ‰āļģāļ—āļ§āļ™āļ™āđ‰āļģ
Keep inside of the Bend, Ship May Aground
(Be careful the Opposite Turning Moment)
Potential Squat
āļāļĨāļąāļšāļĨāļē āļ“ āļˆāļļāļ”āļ„āļļāđ‰āļ‡āđāļĄāđˆāļ™āđ‰āļē
(āđāļĨāđˆāļ™āļ•āļēāļĄāļ™āđ‰āļē āļ—āļĩāđˆāļ„āļļāđ‰āļ‡āđāļĄāđˆāļ™āđ‰āļē)
āļāļĢāļ°āđāļŠāļ™āđ‰āļē
1
2
3
4
āļāļĨāļąāļšāļĨāļē āļ“ āļˆāļļāļ”āļ„āļļāđ‰āļ‡āđāļĄāđˆāļ™āđ‰āļē
(āđāļĨāđˆāļ™āļ•āļēāļĄāļ™āđ‰āļē āļ—āļĩāđˆāļ„āļļāđ‰āļ‡āđāļĄāđˆāļ™āđ‰āļē)
āļāļĢāļ°āđāļŠāļ™āđ‰āļē
1
2
3
THE END

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