MEO Orals on Naval Architecture Function 3 Part 3
- Large apertures cut in floor plates, side girders, and tank bracket plates.
- In double bottom vessels they provide an access to the different cells for inspection and upkeep, besides taking weight off the structure, which is their principal object.
- In a general sense any hole cut in reduce weight without impairing strength.
- An imaginary line drawn 75mm below the bulkhead deck at the ship’s side.
- It is the highest permissible location on the side of the ship of any damage water plane in the final condition of sinkage, trim & heel.
- The outboard strake of the inner bottom.
- When the margin plate is turned down at the bilge it forms the outboard boundary of the double bottom, connecting the inner bottom in the shell plating at the bilge.
- They are peculiarly curved plates, fitted where the stern frame meets the overhang of the stern.
- The pulsation in and out of the bow and stern plating as the ship alternately rises and plunges deep into the water.
- The ratio of water which can enter with the volume of the empty compartment.
- The length between bulkheads on a ship in order to ensure that it will remain afloat if one, or more, compartments are flooded. The permissible length is some fraction of the floodable length.
- The fraction is called the factor of subdivision.
- The pins of bolt that hinge the rudder to the gudgeons on the rudder post.
- An active rudder in which a small motor driven propeller is incorporated in a streamlined casing.
- Ship steering at very low speeds is thus possible and the rudder angle can be greater than 35degrees.
- The impact of the water surface against the side or bottom of a ship hull, whether caused by ship velocity, water velocity, or both.
- Double bottom spaces in which the inner bottom is higher at centre line than at sides.
- This arrangement has the advantage of allowing moisture from the cargo drain into the bilge pockets on each side.
- The dimension and the thickness of rolled sections and the breadth and thickness of plates, which together compose the ship’s structure or part of same.
- Double right-angled drive mechanism in which the propeller operates within a duct.
- The propeller and the duct can be rotated in order to steer the driven vessel.
- The curvature of the deck in a longitudinal direction.
- It is measured between the deck height at amidships and the particular point on the deck.
- The forward shear is twice of the aft shear.
- The course of the shell plating at strength deck level.
- They used to connect the stem to the flat plate keel.
- The forward end of the shoe plate is dished around the stem, whilst the after end is flattened to connect with the keel plate.
- The fore and aft piece, forming the lower part of the stern frame in single-screw vessels extending from the propeller post to the rudderpost.
Standard fire test
- The exposure of a material of a specimen, in a test furnace to a particular temperature for a certain period of time.
- At the ends of a vessel, particularly at the bow, the width of the strake decreases and it is often desirable to merge two strakes into one, this being done by a stealer plate.
- A spoon-shaped stern used on most merchant ships, designed to give maximum immersed length.
- A square-ended stern used to provide additional hull volume and deck space ships.
- A vessel is said to be stiff if she has an abnormally large metacentric height.
- Such a ship may have a short period of roll and therefore will roll uncomfortably.
- A check valve placed at the end of soil or scupper pipes discharging through the ship side near the waterline.
- It allows the water to discharge overboard but prevents seawater from backing up the pipe.
- A line in a fluid such that its tangent at any point is parallel to the instantaneous velocity of the fluid at that point.
- A fore-and-aft girder running along the side of a ship at the shell and also to the outboard strake of plating on any deck.
- Small water plane area, twin-hull vessel.
- Twin torredo shaped hulls are fully submerged with streamlined fins or struts supporting the upper platform or deck.
- It is used for passenger carrying and research vessels because it provides a stable platform.
- A vessel is said to be tender if she has an abnormally small metacentric height.
- Such a ship may have a long period of roll but may list excessively in a strong wind and may be dangerous if a hold is flooded following a collision.
- The slant inward from the vertical of a transverse section of a hull about the designed waterline.
- Fluid flow where the particle motion at any point is rapidly changing both in direction and magnitude.
- A circle moved through by a ship when the rudder is placed in its extreme position.
- It is a manoeuvre carried out on sea trial.
- When a substance is immersed in the water it will appear to suffer a loss in weight.
- Since the actual mass of the substance is not changed, there must be force acting vertically upwards to create the apparent loss of weight.
- This force is called the force of buoyancy, and is considered to act vertically upwards through a point called centre of buoyancy.
- The watertight volume of a ship above the water line is called the reserve buoyancy.
- It can be defined as the buoyancy a ship can call upon to meet losses of buoyancy due to damage of the main hull.
- Its use in the general working of the ship is to provide a sufficiency of freeboard to make the vessel seaworthy.
Ships vibration types
- Synchronous or resonance vibration.
- Local vibration.
- Vibration due to external forces.
Oral Guide by – MIN ZAR TAR
MEO Orals on Naval Architecture Function 3 Part 3