Ship Theory Lines Plan Presentation

8/19/2019 Ship Theory Lines Plan Presentation

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SHIP THEORY

Basics Of ship geometry : Lines Plan

By Jishnu Saji ,

Dept. Of Naval Architecture & Ship Building SN!"#

$erala %ndia



NO# :

• his ppt covers the 'asics of ship theory (ithlines plan and the very 'asics of ship geometryonly (hich % had undergone during my )rstcourse of naval architecture recently .

• So it is recommended to read te*t'oo+s formore +no(ledge.

• Some te*t'oo+s % (ould recommend are :,. Basic Ship heory -olume ,. Principles Of Naval Architecture -ol ,

• /any Of the Pictures in this ppt is ta+en frominternet courtesy is e*tended to the sources.



LINES PLAN

• Lines Plan is a 0d scaled representation of the 10D

comple* form of the ship through descriptive geometry.• VIEWS:

1.Pro)le.Body plan

!.2alf 'readth plan



1. PRO"ILE

: Pro3ection of the ship on a longitudinal verticalplane

: Stations are vertical lines

: Stations are e4ually spaced

: Num'ering of stations can 'e 5 to ,5 or 5 to 5 : Num'ering starts from aft

: 6aterlines are hori7ontal lines

: 6aterlines are mar+ed as 6L, 6L etc.

: 6aterlines are e4ually spaced

: Buttoc+s are curvilinear

: Buttoc+s are mar+ed as B$, B$%% etc.



Actual Pro3ection Of Pro)le vie(



. 2AL8 B9#AD2 PLAN

: Pro3ection of the ship on a longitudinal hori7ontalplane

: Dra(n 'elo( the pro)le vie(

: Stations are mar+ed as vertical lines

: Buttoc+s are dra(n parallel to centerline : Buttoc+s are straight lines e4uidistant from thecenterline

: 6aterlines are curvilinear

: Only half the pro3ection (ith respect to centerline is

dra(n

: No. of (aterlines in pro)le and half 'readth plan issame

: Diagonals are dra(n on the other free half



half 'readth plan of ship



1. BOD PLAN

: Pro3ection of the ship on a transverse plane

: Dra(n on the right side of pro)le

: 6aterlines are hori7ontal

: Buttoc+s are vertical lines

: he centerline is mar+ed : B$ % is closer to centerline

: Stations are curvlinear

: Stations from middle to for(ard are dra(n on theright side

: Stations from aft to middle are dra(n on the left side

: otal num'er of stations in all vie(s is the same

: Diagonals are dra(n as inclined lines



A computer generated Body Plan



Lines Plan



#SES AN$ "#N%TIONS O" LINESPLAN

Lines Plan is used for the calculation of the follo(ing:

• 2ydrostatic calculations

• "apacity calculations

• rim calculations

• 8looding calculations

• "ross curves of sta'ility calculations

• 8airing and o;set reading

• Launching calculations

• 9esistance calculations

• /odel ma+ing

• "alculation of hydrodynamic derivatives

• "alculation o5f hydrodynamic derivatives

• "alculations of 'ending moment shearing force etc.

• Shell e*pansion dra(ing.



O""SET TABLE

%t is a rectilinear ta'ulation of the follo(ing:

• he heights a'ove 'ase line each section(here it is crossed 'y a 'uttoc+ line.

• he half 'readths at each section (herethey are crossed 'y (aterline.

==========================================

#se an& 'un()i*ns O' O+se) Tale• 8or lofting

• As input to computers for fairing andfurther calculations



A typical O88S# ABL#



THAN- YO#

Ship Theory Lines Plan Presentation

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