Basic Statements 2

Question 1

Classification societies have rules and recommendations for each type of ship under design

Answer 1

True - There is a difference between container vessel and a heavy lifter for example

Question 2

Double-hull structure designs have been introduced because ships with double-hull float better in contrast to single-hull ships

Answer 2

False - Double-hull structure is to prevent loosing cargo if the outer hull gets damaged. More important for an oil carrier since an oil leakage is a disaster.

Question 3

One of the major structural functions for a transverse bulkhead is to maintain the shape of the transverse section

Answer 3

True - A short ship needs transverse bulkheads to keep up. The alternative, longitudinal bulkheads, are less efficient but they are lighter than transverse and therefore used by larger ships. The limit goes around 100m

Question 4

In the design of a ship, the superstructures response to sagging/hogging conditions does not have to be considered because the ship beam is large and the superstructure is normally much smaller

Answer 4

False - The superstructure will also bend. However, for a vessel in composite materials this is true du to stiffness properties.

Question 5

A hierarchy of elements is introduced in ship design in order to have a good understanding about how loads are transmitted from a source to the hull girder

Answer 5

True - Easier to detect imbalances and poor constructions

Question 6

The purpose of stiffeners is to prevent the plate areas of a ship from distorting under the influence of the shearing loads, bending moments and local lateral loads.

Answer 6

True - Thats why we use stiffeners

Question 7

A ship has a non-prismatic shape with longer or shorter prismatic body around midship, sometimes called “the parallel midship part”

Answer 7

True - To calculate using beam theory its common to divide the ship in smaller prismatic components

Question 8

Beam theory cannot be applied on non-prismatic beams

Answer 8

False - The non-prismatic beam can be divided into smaller parts that are prismatic and thereby be able to calculate using beam theory.

Question 9

The hull girder shear force is the force that will distort the side shells and the longitudinal bulkheads in shear deformation

Answer 9

True - Thats its job