UNIT # 4

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Author:
Anonymous
ID:
208261
Filename:
UNIT # 4
Updated:
2013-03-19 11:00:09
Tags:
STABILITY BUOYANCY
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Description:
UNIT #4 STUDY
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  1. PRINCIPLES OF STABILITY?
    (MOTHER, GOOSE, BEATS, KIDS)

    • METACENTER
    • GRAVITY
    • BUOYANCY
    • KEEL
  2. WHAT IS STABILITY?
    THE TENDENCY OF A SHIP TO ROTATE ONE WAY OR THE OTHER ( TO RIGHT ITSELF OR OVERTURN?
  3. WHAT IS INITIAL STABILITY?
    THE STABILITY OF A SHIP IN THE RANGE OF 0 DEGREES - 7/10 DEGREES
  4. WHAT IS OVERALL STABILITY?
    A GENERAL MEASURE OF A SHIPS ABILITY TO RESIST CAPSIZING IN A GIVEN CONDITION OF LOADING.
  5. WHAT IS DYNAMIC STABILITY?
    THE WORK DONE IN HEELING A SHIP TO A GIVEN ANGLE OF HEEL.
  6. WHAT IS ROLL?
    SIDE TO SIDE OR PORT TO STBD MOVEMENT.  (ROTATION ABOUT LONGITUDINAL AXIS)
  7. WHAT IS PITCH?
    UP, DOWN, OR BOW TO STERN MOVEMENT.  (ROTATE ABOUT TRANSVERSE AXIS)
  8. WHAT IS YAW?
    TWISTING (ROTATE ABOUT VERTICAL AXIS)
  9. WHAT IS SWAY?
    SLIDING LATERALLY OR SIDE TO SIDE
  10. WHAT IS HEAVE
    UP, DOWN AS IF LIFTED BY WAVES
  11. WHAT IS SURGE?
    SLIDING LONGITUDINALLY OR FRONT TO BACK.
  12. ROLL
    RECURRENT MOTION  (LONGITUDINAL AXIS.)
  13. HEEL
    SEMI-PERMANENT ANGLE OF INCLINATION CAUSED BY A SHIFT IN THE CENTER OF GRAVITY, NEGATIVE GM, OR BOTH
  14. LIST
    PERMANENT ANGLE OF INCLINATION CAUSED BY A SHIFT IN THE CENTER OF GRAVITY, NEGATIVE GM, OR BOTH.
  15. WHAT IS FORCE?
    A PUSH OR A PULL.  TENDS TO PRODUCE MOTION OR A CHANGE IN MOTION
  16. WHAT IS WEIGHT
    GRAVITATIONAL FORCE.  DIRECTION TOWARD CENTER OF EARTH.
  17. FORCE OF BUOYANCY
    AN OBJECT IMMERSED IN A LIQUID EXPERIENCES AN UPWARD THRUST EQUAL TO THE WEIGHT OF THE LIQUID DISPLACED.
  18. DISPLACEMENT
    THE WEIGHT OF THE VOLUE OF WATER THAT THE SHIPS HULL IS DISPLACING.
  19. WHAT IS RESERVE BUOYANCY?
    RESERVE BUOYANCY IS EQUAL TO THE AMOUNT OF FREE-BOARD A SHIP HAS.  THE AREA FROM THE WATERLINE TO THE FLIGHT DECK.
  20. METACENTER
    POINT OF INTERSECTION OF TWO SUCCESSIVE LINES OF ACTION OF THE FORCE OF BUOYANCY AS THE SHIP IS INCLINED THROUGH A VERY SMALL ANGLE.
  21. CENTER OF GRAVITY
    POINT AT WHICH THE ENTIRE WEIGHT OF THE SHIP MAY BE CONSIDERED TO BE CONCENTRATED.

    COG OF A SYSTEM OF WEIGHTS IS FOUND BY TAKING MOMENTS ABOUT AN ASSUMED CENTER OF GRAVITY.
  22. THREE MOVEMENTS OF GRAVITY (G)
    • G MOVES TOWARDS A WEIGHT ADDITION
    • G MOVES AWAY FROM A WEIGHT REMOVAL
    • G MOVES IN THE DIRECTION OF A WEIGHT SHIFT.
  23. METACENTER VS GRAVITY
    G MOVES FASTER AND FARTHER THAN METACENTER.
  24. GM
    METACENTRIC HEIGHT
  25. BM
    METACENTRIC RADIUS
  26. KM
    HEIGHT OF METACENTRIC
  27. KG
    HEIGHT OF GRAVITY
  28. THREE CONDITIONS OF STABILITY
    • POSITIVE
    • NEUTRAL
    • NEGATIVE
  29. MAXIMUM RIGHTING ARM
    THE HIGHEST POINT ON CURVE IS THE ANGLE OF MAXIMUM RIGHTING ARM
  30. DANGER ANGLE
    IS HALF THE MAXIMUM RIGHTING ARM ANGLE
  31. FP
    FORWARD PERPENDICULAR
  32. MP
    MIDSHIP PERPENDICULAR

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