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Mechanical Engineering Design Project

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by

Jovita Pereira

on 25 August 2014

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Transcript of Mechanical Engineering Design Project

Recommendation
Introduction
Technical Drawings
Concept, Rationale
& Function

Manufacturing Process
Introduction:
Recommendations:
Replace wooden jig to metal jig
Dimension
Errors
Miscommunication
Centering problem

Customer Requirements:

Functions:
Design Requirements:
The Design
The Wheel
Mechanical Engineering Design Project
Soh Pei Yi
Finished Product
Initial Conceptualization
Five-spoked Layers
Clear Acrylic frame
Lightweight and Attractive
Conclusion
Tan Liang Kai
Francis Ong Jia Cek
Tan Yong Tat
Muriel Bernadine Fred Pereira
Calvin Lee Yong Huei
- Keywords:
Low Mass
.
Low Rolling Resistance
- Polyurethane "Tweel"
Fabrication Process
Assembly

Purchasing

of material
Preparation

of material required for mating parts
.
.
.
Purchasing of material
Tyres

Preparation of Material Required for Mating Parts


Shaft
Solvent
Assembly

Design and build a prototype of a wheel
For competing in Shell Eco Marathon
Energy efficient – travel furthest with the least fuel
-Made out of rubber
The Wheel
RIM
-Aluminium alloy and Carbon fibre
SPOKES
-Up to twelve spokes
-Unconventionally replaced with loops
HUB
-Center of the wheel
-Houses wheel bearings
TYRE
-Taken out in more pioneering designs
Performance depends on

before deciding on an optimum design.
Understanding of customer requirements needed
Same depth: wider wheel, lower rolling resistance
Rim depth, spoke count, hub shape, spoke size
Aerodynamics
-Light weight – low density
Withstand lateral loading with minimum lateral deflection
Safety factor ≥ 1.5
Disc brake rotor of the dimensions
*
*
[
]
-Can withstand high static and lateral forces
-Rolling resistance
-Manufacturing process
Withstand static loading
To be installed onto a fixed test rig for testing
Minimize friction force
Minimize rolling resistance
.
Minimum rolling resistance
Lateral deflection ≤ 1mm
Safety factor ≥ 1.0
Mass = 500g
Static loading = 45kg
Lateral force = 400N (30mm x 5mm)
.
shown is able to be
installed into the wheel.
Jig
Displacement test

Factor of safety test
Surface
Weight
Rolling resistance
Wood has an uneven surface
Adheres to the jig after cured
Affected the dimension & thickness of product
Metal does not easily stick due to smooth surface
Strength of bonding layers depends on bonding quality
Bubble trapped between two layer will reduce strength
Single piece of perspex instead
Improve jig design
Center hole
of bonding few layers together.
Cut in smaller diameter
Lathe to desire diameter after each layer bond together
Design
requirements are met
However
, there is a lack of
Lateral deformation performance
Pulling resistance
Single
perspex to improve result
Material
use for jig
Experiences
and Skills

vs
Loopless "Kickstarter"
Plexiglass Wheel
simple to manufacture,
cost effective,
fulfills weight requirement.

Concept & Features of our Wheel
Features
Form
&
Function
Rationale of Design
Material
Manufacturing
Low Density = Lighter
High Surface Hardness
- Resistance to cracks and environmental factors
Acrylic Glass
Ease of Access & Manufacture
Cost efficient
Rubber Hose
Perspex
Laser cut to precision
Layered using Solvent
Rubber Hose
Trimmed, stretched,
fixed with Adhesive Glue
:
:
Layers vary in dimension and geometry
[to reduce mass]
Spokes of non-uniform width;
I-beam cross section

[to resist deflection & twisting force]

Two Bearings;
Force fitted with Spacer
[to reduce friction between rotating parts]
Flat rubber tyre;
Wrapped tightly around the Rim
[Hard surface ~ lesser friction]
Full transcript