辅导案例-MIET1084-Assignment 2

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Page 1 of 5 Finite Element Analysis – Assignment 2
MIET1084 – 2020
Assignment 2
Total Marks – 15 (15% of course mark)
Due Date – Friday, 25th September 2020

Background
You have been tasked with the structural design of a vehicle moment of inertia swing rig. The swing rig
is designed to provide a platform to be able to determine the moment of inertia of a vehicle in various
orientation. The vehicle is placed on the platform, which is suspended on a frame, and then
subsequently swung back-and-forth. The period of oscillation of the swinging frame is measured, and
subsequently utilised to determine the moment of inertia of the vehicle parallel to the axis of the swing’s
rotation.
The important design parameters of the swing rig are its mass and stiffness. In addition to improving
the maintainability and serviceability of the system, a low mass reduces the error in the measurement
of the vehicle’s inertia (the inertia of the rig can be subtracted from the calculation, a larger mass
increases the uncertainty of the measurement). A stiffer swing rig will have a larger percentage of its
kinetic energy in the swinging mode, thereby increasing the accuracy of the measurement.
You will be provided overall dimensions of the swing rig to be designed, a list of mandatory structures,
the details of the proof load case and a list of beam cross sections that may be utilised in the design.
You will be required to design a rig that, at the proof load, has a yield stress factor of safety greater than
10 and a static deflection less than 1.00 mm. The rig must have a mass less than 80 kg.


Figure 1. Example schematic of a vehicle motion of inertia swing rig.




Page 2 of 5 Finite Element Analysis – Assignment 2
Task
You are to utilise Abaqus to construct the geometry of the rig shown in Figure A1, including both the
base and the swing arms. Please note that the structure shown in Figure A2 represents the minimum
structure permissible; more structural members may be added to the frame as required.
It is highly recommended that a base analysis is conducted utilising smaller section sizes available as
per Table A2, the base geometry shown in Figure A1 and the load case presented in Table A1. The
beam cross section profile provided in Table A2 must be adhered to.
Once the initial design has been analysed, you are to adjust the design, such that the design meets the
mass, safety factor and displacement requirements provided above.
All tube members must be manufactured from AISI 1010 steel, with material properties found in Table
A3. No tube members – excluding the swing arms – of the final chassis may intersect the section shown
as the ‘Exclusion Zone’ in Figure A3.
Note that the coordinates of the frame shown in Figure A2 should be adhered to in the analysis.
Please note that the swing arms may be either pinned jointed or fully fixed to the base frame, and that
the they may be represented as either truss or beam elements, as per your designed of the rig.
Submission
You are to complete your report as per the template available on the Canvas site. Your report and work
will be assessed as per the report marking scheme in Table 1.
Additionally, you are to submit the .cae, and .odb files of your final analysis. These files will be used as
clarification of work and results during assessment and grading.
Report Layout
Table 1
Submission Description
Abstract
A short statement on the problem addressed, the work undertaken and
quantification of the final outcomes.
Introduction
Provide a brief overview of the problem. Nominate the objectives and
aims of the work, which will be undertaken and addressed in the
subsequent sections
Finite Element
Model
The details of your finite element model should be provided in this
section. Appropriate engineering reasoning should be given for the
analysis and modelling techniques. Topics covered should include;
geometry, element types, meshing strategies, material properties,
boundary conditions, loads and outputs.
Design
Development
The outcomes of your initial FE analysis should be reviewed relative to
the system specifications. Potential design improvements should be
made to the system and subsequently analysed using the finite element
method. Weighting will be given to both your capacity to efficiently and
effectively interpret the outputs of the simulations and the methods taken
to improve the design.
Results
Finalise the outcomes of your analysis process. Make appropriate use
of figures, tables and graphs. Ensure that all graphical work is
meaningful in context and specific.
Discussion
Describe efforts made to ensure your analysis is reliable and verified.
Discuss how validation of the analysis could be achieved.
Conclusion
Summarise and formulate the outcomes of your work. Ensure that this
section addresses the fundamental problem being studied.
Communicate any potential improvements that could be made beyond
the scope of the report.


Page 3 of 5 Finite Element Analysis – Assignment 2
Appendix
Table A1. Load cases to be examined
Load
Name
Loads
Applied
Application
Point
Displacement Boundary
Conditions
Full
Vehicle
Load
Case
Fy = -5000 N
Equally
distributed
across the blue
patches as per
Figure 2 and
Figure A1
Fixed translation in all directions
and fixed rotation in x-axis Fixed
Nodes, shown in Figure A2.
Gravity Entire System


Table A2. Available Cross Sections
Tube Members Source
Rectangular
Hollow Section
https://www.orrconsteel.com.au/products/tube-
pipe/structural/rectangular-hollow-section
Square Hollow
Section
https://www.orrconsteel.com.au/products/tube-
pipe/structural/square-hollow-section
Channel Section
https://www.orrconsteel.com.au/products/hot-
rolled-structural-steel/channel
I-Beams
https://www.orrconsteel.com.au/products/hot-
rolled-structural-steel/beam

Table A3. AISI 1010 steel material properties
Young’s
Modulus
(GPa)

Yield Strength
(MPa)
Ultimate Strength
(MPa)
Density
(kg/m3)
200 305 365 7872



Page 4 of 5 Finite Element Analysis – Assignment 2

Figure A1. Overall schematic of the base frame. Note the dotted lines represent the centreline of the
beam




Page 5 of 5 Finite Element Analysis – Assignment 2

Figure A2. Isometric view of the swing rig. Note the Fixed Nodes and the load application zone
shown in blue. The swing arms (shown in grey dotted lines) may be either fully fixed to the base
frame, or they may be pin jointed.

Figure A3. Side view of the swing rig. Note the height of the swing rig and the exclusion zone shown
in green.


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