Posted: December 29th, 2022

MARN342 (Naval Architecture 2) Module

Module: MARN342 (Naval Architecture 2) Module Leader & Lecturer:
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MARN 342 Coursework 2022-23
This coursework has 5 tasks (detailed descriptions of these tasks are given later):
Task-1: Hull design and analysis using Maxsurf (50 marks)
Task-2: Analysis of hull’s longitudinal strength (15 marks)
Task-3: Structural analysis of amidships section (15 marks)
Task-4: Buckling analysis of longitudinals (10 marks)
Task-5: Production of General Arrangement (GA) drawing (10 marks)
 You are required to perform all of the tasks detailed below and submit: (1) an
individual report and (2) Software output files (i.e. Maxsurf Modeler, Maxsurf
Resistance, Maxsurf Stability, Maxsurf Motions and the CAD file for GA).
 The report must be submitted in MS Word format. If the software output files are
too large, you may consider to submit all files as a .Zip file.
 Submitted Maxsurf and CAD files will be used only for verifying the authenticity
and the ownership of the tasks and shouldn’t be considered as part(s) of your
report. Therefore, your report submitted in MS Word must be complete. You will
receive marks based on the contents presented in the MS Word report only.
 Your report must include the formulae you have applied and the step-by-step
calculations that you have done. You are not allowed to submit excel files or
direct calculations (e.g. final/partial results without showing step by step
calculations).
 Where you use quotes, diagrams, figures, sketches, tables, data etc. from
external sources; you must mention the original sources as references within the
texts and in the bibliography.
 There is no word/page limit for the report but marks will be allocated with the
considerations of the layout, presentation style, clearness and transparency,
uniqueness of the report, logical discussion, and the appropriateness of your
answers.
In addition to the lecture notes, there are a number of documents available under the
“Resources” folder in the DLE site of this module and you may find those helpful to
answer the tasks.
An electronic copy of “Lloyds Rules” will be provided to you and those rules will need
to be applied for some of these tasks.
Submission: Individual report (written in MS Word) along with Maxsurf and CAD
files as instructed above should be submitted electronically via DLE only.
Module: MARN342 (Naval Architecture 2) Module Leader & Lecturer: Dr Jahir Rizvi
BEng/MEng (Hons) Marine Technology University of Plymouth
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Task-1: Hull design and analysis using Maxsurf (50 marks)
You have to use your naval architectural knowledge along with your skills in Maxsurf
Software Package to design a hull of a monohull ferry (hull only, no superstructure is
required). The vessel should be able to run at 28 knots in seawater of density 1.025
tonnes/m3 at a design draught below 2.9 m. The deadweight corresponding to
summer load waterline of the vessel should be considered as 580 tonnes. The
vessel must have round bilge and vertical sides.
Now complete the task by answering 1 to10: (5 marks each)
1. Select a ship design methodology and explain how you have implemented the
methodology to design your hull.
2. Show necessary calculations that you have done to determine the principal
particulars of the vessel, deck area and the number of decks required.
3. Produce a hull (you have to design only the hull upto the full depth of the
vessel, no superstructure is required) and include a special design feature
such as bulbous bow or bilge keel or fin stabiliser or bow thruster to the hull as
you think necessary. Ace my homework – Write my paper – Online assignment help tutors – Discuss with evidence why such design feature would be
advantageous to your hull.
4. Produce a general arrangement drawing of the hull (showing tanks,
compartments, engine room etc.) along with the lines plan that you have
created using Maxsurf Modeler software.
5. Identify the propulsive power requirements of your hull using the outputs from
Maxsurf Resistance Software. Ace my homework – Write my paper – Online assignment help tutors – Discuss how the specified power requirement
of the vessel would vary with its’ operating conditions.
6. Perform necessary calculations and investigate whether the hull meets the
EEDI criteria. Provide recommendations if the criteria is not met.
7. Determine the vertical centre of gravity of the hull in Maxsurf Stability Software
defining load cases for the hull in lightship condition and the summer
freeboard condition.
8. Ace my homework – Write my paper – Online assignment help tutors – Discuss the hull’s intact stability (e.g. GZ, GM etc.) based on the analyses in
Maxsurf Stability Software at fully loaded and lightship conditions.
9. Assess the hull’s damage stability (e.g. floodable length calculation, stability in
damaged condition etc.) using Maxsurf Stability Software at fully loaded and
lightship conditions.
10.Use Maxsurf Motions Software and analyse the sea keeping performances
(e.g. RAO, MSI etc.) of the hull in sea state-4 under head, beam and following
sea conditions. Identify the worst hull location, worst heading and worst sea
condition.
Module: MARN342 (Naval Architecture 2) Module Leader & Lecturer: Dr Jahir Rizvi
BEng/MEng (Hons) Marine Technology University of Plymouth
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Task-2: Analysis of hull’s longitudinal strength (15 marks)
To determine the stresses (σ) on a ship at a distance y from the neutral axis it is
necessary to determine the bending moment (M). A simple method to determine the
bending moment is to divide the ship lengthwise into equal sections and examine the
weight and buoyancy experienced by the section. This can then be used to generate
shear force and bending moment diagrams from which the maximum bending
moment can be determined. This method is not exact and can lead to rounding off
errors in both diagrams. However, it is a useful method to get a reasonably accurate
assessment of the still water bending moment.
Now divide your vessel (designed in Task 1 for seawater of density 1.025 tonnes/m3
)
into 10 equal sections lengthwise starting from the aft.
1. Estimate the area and the mass of each of the sections between the ordinates
and record in the Table below. (3 marks)
Ordinates 0-1 1-2 2-3 3-4 4-5 5-6 6-7 7-8 8-9 9-10
Area (m2
)
Mass (tonne)
2. Use the data in the table above and calculate shear forces (MN) and bending
moments (MNm) created in the hull. (9 marks)
3. Plot the calculated shear forces (MN) and bending moments (MNm) and
comment on the characteristics of the curves. (3 marks)
Module: MARN342 (Naval Architecture 2) Module Leader & Lecturer: Dr Jahir Rizvi
BEng/MEng (Hons) Marine Technology University of Plymouth
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Task-3: Structural analysis of amidships section (15 marks)
Ships are complex structures made up of plates, beams, brackets, girders,
longitudinals and stiffeners. This makes the determination of the neutral axis and
the moment of inertia an essential first step in determining stresses in the structure
using the equation: =

where is the bending moment, is the distance from
the neutral axis, is the moment of inertia and is the stress at distance from the
neutral axis. Hence,
1. Sketch the shape of the amidships section of your hull that you have created
in Task-1 and include the following structural items with labels (you are
allowed to choose the total number, the size and the shape of longitudinals
and girders as you think appropriate):
a. Deck plate
b. Deck stringer
c. Deck longitudinals
d. Deck side girder
e. Deck centre girder
f. Shear strake
g. Side plating
h. Bilge
i. Inner bottom plating
j. Margin plate
k. Inner bottom longitudinals
l. Bottom side girder
m. Bottom centre girder
n. Bottom plating
o. Bottom longitudinals (3 marks)
2. Provide appropriate scantlings of the above structural items, apply the parallel
axis theorem, and calculate the section modulus at the (i) top deck and (ii) hull
bottom.
(9 marks)
3. Rulefinder Version 9.37 (July 2022) [> Lloyd’s Register Rules and
Regulations > Rules and Regulations for the Classification of Ships, July
2021 > Part 3 Ship Structures (General) > Chapter 4 Longitudinal Strength >
Section 5 Hull bending strength] provides formula to calculate minimum hull
section modulus (Zmin). Compare your calculated section modulus at the
strength deck with that of the Lloyds’ recommended minimum value and
discuss your observations. (3 marks)
Module: MARN342 (Naval Architecture 2) Module Leader & Lecturer: Dr Jahir Rizvi
BEng/MEng (Hons) Marine Technology University of Plymouth
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Task-4: Buckling analysis of longitudinals (10 marks)
Provide a sketch of your designed hull’s bottom longitudinal (this should include a
portion of the bottom plating as lower flange) and show the scantlings.
Consider the hull that you have calculated in Task-1, is made of a material having
= 205 GPa and Poisson’s ratio 0.3. If the longitudinal spacing (b) and the transverse
spacing (L) within the bottom structure of the hull are 710 mm and 2.65 m
respectively and the longitudinal is fixed at both ends,
a. Calculate the maximum deflection at the midspan of the longitudinal.
(8 marks)
b. Calculate the maximum stress in the longitudinal. (2 marks)
Module: MARN342 (Naval Architecture 2) Module Leader & Lecturer: Dr Jahir Rizvi
BEng/MEng (Hons) Marine Technology University of Plymouth
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Task-5: Production of General Arrangement (GA) drawing (10 marks)
In this task, you will need to produce a general arrangement (GA) drawing for
the hull that you have created in Task-1. You have to import the Maxsurf
Modeller hull into a CAD software to include superstructure and deck(s) as
you have outlined in Task-1.
Your report for this task must include a profile view, plan view and the views
from fore and aft. Examples of GA can be found in the lecture notes and you
can use those as a reference.
_______________________________End_________________________________

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