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Page 1: Ship interactions online

Ship maneuvering

CHAPTER 3: THEORIES OF SHIP

MANEUVERING (SHIP INTERACTIONS)

CAPTAIN TANAMESH PUSANASURAPUNT

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Fixed Screw Propeller

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Larger Ship

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Ship-Handling with 4 Tugs

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Berthing with 5 Tugs

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Ship-Handling with 4 Tugs

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0900 - 1200

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Daniel Bernoulli

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+ gz + p = Constant 2 ρ

v: Fluid Flow Speed g: Acceleration due to gravity

z: Elevation of Point Above Reference Planep: Pressureρ: Density of Fluid

Bernoulli’s PrinciplesBernoulli’s Equation

For Uncompressed Flow (Fluid)

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Bernoulli’s Equation For Uncompressed Flow (Fluid)

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+ + 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

Bernoulli’s PrinciplesBernoulli’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 WHERESHIP INTERACTIONS OFTEN

HAPPEN

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Shallow Water Effect

Bank Effect

Shallow Water Effect

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SHALLOW WATER EFFECT

(SWE)

CAPTAIN TANAMESH PUSANASURAPUNT

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Shallow Water Effects

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Shallow Water Effects

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เรื�อ Braer ปี� 1993 สกิอตแลนด์� น���มั�นด์บ 85 ล��นลตรื ส�เหต�เกิยต��น

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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

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SQUAT (SQUAT)

CAPTAIN TANAMESH PUSANASURAPUNT

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SQUAT (Keel)

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SQUAT (Keel)

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Squat

SQUAT (Stern)

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POTENTIAL SQUAT (Stern)

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SQUAT (Bow)

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กิรืณี�เรื�อเด์นหน��- ทรืมัห�ว

W

P

เปี�นสถ�นกิ�รืณี�ท�!ไมั#พึ%งปีรืะสงค์�อย#�งย!ง - ไมั#ส�มั�รืถค์�ด์เด์�อ�กิ�รืเรื�อได์� Wind

POTENTIAL SQUAT (Bow)

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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

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Bernoulli's Principle

Applications

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SHIP INTERACTION

CAPTAIN TANAMESH PUSANASURAPUNT

Positive Pressure (+) and Positive Pressure (+)=> Push ApartPositive Pressure (+) and Negative Pressure (-)=> SuctionNegative Pressure (+) and Negative Pressure (-)=> Suction

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SHIP PASSING

CAPTAIN TANAMESH PUSANASURAPUNT

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Ships Passing

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SHIPS OVERTAKING

CAPTAIN TANAMESH PUSANASURAPUNT

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Ships Overtaking

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Ships Overtaking

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Ships Overtaking

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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 AheadIf Aft closes to the bank, 2 Choices : Kicking Ahead, or Putting Sternway

เล��ยวท�!โค์�งแมั#น���ต�มัน���

Potential Squat

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1 Possibility : Keep Inside, With Right Rudder to Bow Straight AheadIf Aft closes to the bank, 2 Choices : Kicking Ahead, or Putting Sternway

เล��ยวท�!โค์�งแมั#น���ต�มัน���Potential

Squat

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เล��ยวท�!โค์�งแมั#น���ทวนน��� Keep inside of the Bend, Ship May Aground (Be careful the Opposite Turning Moment)

Potential Squat

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กิล�บล�� ณี จุ�ด์ค์��งแมั#น���(แล#นต�มัน��� ท�!ค์��งแมั#น���)

กิรืะแสน���1

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กิล�บล�� ณี จุ�ด์ค์��งแมั#น���(แล#นต�มัน��� ท�!ค์��งแมั#น���)

กิรืะแสน���

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THE END