Prof P Myler 2021

MEC 6003 BSc Computer Aided Analysis – 2021
Motor Cover design Exercise – Assignment 1 (LO 1, 25%)
Scenario
Your clients have provided you with a drawing of a Motor Cover shown at the end of the assignment
along with your individual dimensions. They are considering having manufactured for their luxury
yacht. The cover houses a motor in the engine room. Acting as the design engineer for the clients you
have been tasked with undertaking an FEA study of the cover prior to manufacture.
Considerations
1. The client needs to position 4 conditioning sensors and wants you to determine the best position.
The sensors must be positioned on the top face and at least 40mm from any edge or bend. The
dimensions of the sensors are 15mm square.
2. A 100mm access hole MAY be required in the top of the guard (denoted by A & B on the drawing).
The client would like to know how this addition is likely to influence your recommendations.
Additional Known Factors
i) The motor runs at 3000 rpm
ii) The side panels can reach up to 50oC when in operation
iii) The material the client would like to use is Aluminium Sheet
iv) The sensors are delicate and work at their best when kept as still as possible
v) The cover is likely to be positioned in an area where it could be stood on during
operation.

Student Number: ____________________ MASS without hole: ______________
T = _____________ L=_____________ A=_______________B = _______________

Answer the questions overleaf in the document in BLACK. Do not change the font size or
layout or increase the page size. Your completed written answers should not be greater than
one page. Adequate space for your answers is provided. You may add 2 pages for your 4
images.

UPLOAD YOUR COMPLETED pdf file to TURNITIN.
WE RESERVE THE RIGHT TO VIVA.

DEADLINE = 26th March 2021 at 16 55pm

Prof P Myler 2021

1). State your assumptions (20%)
_________________________________________________________________________
_________________________________________________________________________
_________________________________________________________________________
2). Why are the corners of the structure rounded? (5%)
_________________________________________________________________________
3) Comment on the mode shapes generated by your analysis (5%)
_________________________________________________________________________
_________________________________________________________________________
4) The cover is likely to be positioned in an area where it could be stood on during operation,
comment on the suitability of your design for this situation (15%)
_________________________________________________________________________
_________________________________________________________________________
5) What would be the implications of changing the material to a fibre reinforced composite?
(5%)
_________________________________________________________________________
6) What method of stress analysis have you used and why is this appropriate? (5%)
_________________________________________________________________________
7) If the hole was changed to a 100mm square instead of a circle how would this change the
predicted results? (5%)
_________________________________________________________________________
8) How does your analysis differ in the way the motor cover is secured as opposed to a real
life scenario? (10%)
_________________________________________________________________________
_________________________________________________________________________
9) Suggest possible manufacturing methods for your motor cover (5%)

_________________________________________________________________________

Prof P Myler 2021

10) You are allowed to include four images ONLY! Choose those that best support your
analysis. (25%)


Fig. 1 Basic Drawing of motor cover with associated dimensions.
Table 1 Individual Dimension for the cover

T=Thickness in mm
2.5 2.75 3 3.25

D
im
en
si
o
n
A
in
m
m

150 2006172 2006419 1809522 400
L
-
Le
n
gt
h
in
m
m

175 1809508 2006630 2007687 425
200 2006791 1610961 2007739 8016640 450
225 1906451 2006816 1709235 1709250 475
250 8015309 1709236 2003328 1709252 500
275 1709265 1709263 2003480 1709249 525
300 2006216 8014687 1709238 1709262 550
140 155 170 185
Dimension B in mm
















































































































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