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
400
425
450
475
500
525
550
150
2006172
2006419
1809522
175
1809508
2006630
2007687
200
2006791
1610961
2007739
8016640
225
1906451
2006816
1709235
1709250
250
8015309
1709236
2003328
1709252
275
1709265
1709263
2003480
1709249
300
2006216
8014687
1709238
1709262
140
155
170
185
Dimension B in mm
Dimension A in mm
L – Length in mm