Naval Architecture's Knowledges

19/03/2015

Transverse Structural Components
Primary role of transverse members >to resist the hydrostatic loads
Floor>deep frame running from the keel to the turn of the bilge
Frame>a transverse member running from keel to deck,resists hydrostatic pressure, waves,impact,etc
Deck beams>transverse members of the deck frame
Plating>thin pieces closing in the top,bottom & side of structure, contribute significatly to longitiludinal hull strength, resists the hydrostatic pressure loads (or side impact )

18/03/2015

18/03/2015

Longitudinal Structural Components
Keel>large center-plane girder,run along the longitudinal bottom of the ship
Longitudinal>girders running parallel to the kewl along the bottom,provide the longitudinal strength
Stringer>girders running along the sides of the ship,typically smaller than a longitudinal, provide longitudinal strength
Deck Girder>longitudinal member of the deck frame(deck longitudinal )

01/02/2015

Ship Stability-ေရယာဥ္တည္ၿငိမ္မႈ

ေရယာဥ္တစ္စီးသည္ ျပင္ပမွအား(ဥပမာ-ေလ၊လႈိင္း)တစ္ခုသက္ေရာက္ တိမ္းေစာင္းသြားေသာ္လည္း အားပ်က္ျပယ္သြားလ်င္ မႈလပုံမွန္တည္ေနရာကုိျပန္လည္ေရာက္ရိွျခင္း
ေရယာဥ္တည္ၿငိမ္မႈကုိ သက္ေရာက္မႈျဖစ္ေစေသာ အေျခခံအေၾကာင္းအရာမ်ား
-Center of Gravity of ship G -AP သုိ႔ FP မွၾကည့္လ်င္ ေရယာဥ္တည္ၿငိမ္ေနစဥ္ Center line တစ္ေလွ်ာက္တြင္တည္႐ွိ(ပုံ ၁)
-Center of Buoyancy B -ေရယာဥ္တစ္စီး ေရေပၚေပၚေစရန္ ေရယာဥ္အေလးခ်ိန္ကုိ ဆန္႔က်င္၍ အထက္သုိ႔ျပန္လည္ ပင့္တင္ေသာအားသက္ေရာက္ေသာေနရာ၊ G သက္ေရာက္ေသာ မ်ဥ္းတစ္ေလွ်ာက္တြင္တ အရာ၀တၳဳ ည္႐ွိ (ပုံ ၂)
-Metancenter M -ေရယာဥ္တိမ္းေစာင္းမႈျဖစ္ေပၚလ်င္ G ႏွင့္ B သည္ ေရယာသင္တိမ္းေစာင္းရာဘက္ကုိေ႐ႊ႔ေျပာင္း၊ သက္ေရာက္တဲ့အားအတုိင္း မ်ဥ္းတစ္ေၾကာင္းဆြဲလွ်င္ ေရယာဥ္ Center line ျဖတ္သြားေသာဆုုံမွတ္ေနရာ
M ႏွင့္ G ၾကားအကြာအေ၀းကုိ Metacentric Height (GM )လုိ႔ေခၚ
-Righting Arm-ေရယာဥ္တိမ္းေစာင္းလ်င္ B တည္ေနရာက တိမ္းေစာင္းတဲ့ဘက္ကုိေရႊ႔ သြားတဲ့ေနရာက ေထာင္လုိက္မ်ဥ္းတစ္ေၾကာင္းဆြဲ M အားျဖတ္ မ်ဥ္းေပၚသုိ႔ မူလ G မွေထာင့္မွန္မ်ဥ္းဆြဲရာအကြာအေ၀းကုိ (GZ) ေခၚ
-Turning Moment- ေရယာဥ္ Displacement ႏွင့္တိမ္းေစာင္းမႈေၾကာင့္ျဖစ္ေပၚေသာ အားသက္ေရာက္မႈအကြာအေ၀း Righting Arm ေျမႇာက္ျခင္း
ေရယာဥ္တိမ္းေစာင္းမႈအားျပန္လည္တည့္ေစေသာအား
Turning moment=Displacement ×GZ

10/12/2014

Main parts of ship. 1: Smokestack or Funnel; 2: Stern; 3: Propeller and Rudder; 4: Portside (the right side is known as starboard); 5: Anchor; 6: Bulbous bow; 7: Bow; 8: Deck; 9: Superstructure

03/12/2014

Construction
depend on the material used. When steel or aluminium is used this involves welding of the plates and profiles after rolling, marking, cutting and bending as per the structural design drawings or models, followed by er****on and launching. Other joining techniques are used for other materials like fibre reinforced plastic and glass-reinforced plastic.

03/12/2014

Arrangements
involve concept design, layout and access, fire protection, allocation of spaces, ergonomics and capacity.

03/12/2014

Structures
involve selection of material of construction, structural analysis of global and local strength of the vessel, vibration of the structural components and structural responses of the vessel during motions in seaway.

03/12/2014

Hydrodynamics
concern the flow of water around the ship's hull, bow, stern and over bodies such as propeller blades or rudder, or through thruster tunnels.
Resistance – resistance towards motion in water primarily caused due to flow of water around the hull.
Powering calculation is done based on this.
Propulsion – to move the vessel through water using propellers, thrusters, water jets, sails etc.
Engine types are mainly internal combustion. Some vessels are electrically powered using nuclear or solar energy.
Ship motions – involves motions of the vessel in seaway and its responses in waves and wind.
Controllability (maneuvering) – involves controlling and maintaining position and direction of the vessel

03/12/2014

Hydrostatics
concern the conditions to which the vessel is subjected to while at rest in water and its ability to remain afloat. This involves computing buoyancy, (displacement) and other hydrostatic properties.
Trim – The measure of the longitudinal inclination of the vessel.
Stability – The ability of a vessel to restore itself to an upright position after being inclined by wind, sea, or loading conditions.

22/11/2014

Manufacturing process

22/11/2014