ENGINEERING LESSON GUIDE 14

1
INTRODUCTION TO NAVAL ENGINEERING
HYDRAULIC SYSTEMS
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USES OF HYDRAULICS

• Shipboard systems using hydraulic power
• Steering gear rudder, fairwater and stern
  planes
• Valve actuators
• Deck machinery anchor windlass, capstans,
  winches, etc.
• Mast and antennas on submarines
• Weapons systems munitions loading and
  launching(guns, missiles, and torpedoes)
• Other presses, elevators

3
PROPERTIES OF LIQUIDS

• Shapelessness
• No natural shape
• Conforms to the shape of the container
• Incompressibility
• Transmission of force
• Force is equally distributed throughout the liquid

4
PASCALS LAW

• Pressure in a fluid acts equally in all directions

5
Find Pressure Find F2
PRESSURE FORCE/AREA
200 lbf
Pressure 10 psi
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BASIC HYDRAULIC POWER SYSTEM
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ACCUMULATOR

• Shock
• Supply
• Demand Changes
• Make-up

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HYDRAULIC SYSTEMS

• ADVANTAGES
• Long distances
• Great flexibility
• Variable speed control
• Safety and reliability

• DISADVANTAGES
• Need for positive confinement
• Fire hazard if leaks occur
• High pressure
• Need filtration

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QUESTIONS?
13
Reading

• Read
• Intro to Naval Engineering Chapter 16, pp
  307-318

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QUESTIONS ????