mie441_2008_ppt11
TRANSCRIPT
8/12/2019 MIE441_2008_PPT11
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Personnel Aerial LiftMIE441 Final Project Report
Group A
By: David Manuel Choy
Rouzbeh (Ray) Rabiei
Chien-Lee (Lawrence) Sun
Group A – Choy, Rabiei, Sun
Presentation Overview
Introduction
Engineering Specifications
Design Methodology
Force Analysis
Finite Element Analysis and Design Optimization
Conclusion
Q & A
Presentation
Overview
Introduction
Engineering
Specifications
Design
MethodologyForce Analysis
FEA & Design
Optimization
Conclusion
Q & A
8/12/2019 MIE441_2008_PPT11
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Group A – Choy, Rabiei, Sun
Introduction
Objective
To provide the crew of the maintenance department of a
building complex with a light duty lift.
Proposed Solution: Scissor Lift
Compact in lowered position
Lift objects with good relative stability
Ability to use larger platform
PresentationOverview
Introduction
Engineering
Specifications
Design
Methodology
Force Analysis
FEA & Design
Optimization
Conclusion
Q & A
Group A – Choy, Rabiei, Sun
Engineering Specifications
Maximum load of 300kg
Minimum lifting height 3m
Platform to carry two people and maintenance
equipment
Safety factor of 2 against failure
Presentation
Overview
Introduction
Engineering
Specifications
Design
MethodologyForce Analysis
FEA & Design
Optimization
Conclusion
Q & A
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Group A – Choy, Rabiei, Sun
Design Methodology
Personnel Aerial Lift split into three modules:
Base unitPresentationOverview
Introduction
Engineering
Specifications
Design
Methodology
Force Analysis
FEA & Design
Optimization
Conclusion
Q & A
Group A – Choy, Rabiei, Sun
Design Methodology
Personnel Aerial Lift split into three modules:
Scissor Link UnitPresentation
Overview
Introduction
Engineering
Specifications
Design
MethodologyForce Analysis
FEA & Design
Optimization
Conclusion
Q & A
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Group A – Choy, Rabiei, Sun
Design Methodology
Personnel Aerial Lift split into three modules:
Platform UnitPresentationOverview
Introduction
Engineering
Specifications
Design
Methodology
Force Analysis
FEA & Design
Optimization
Conclusion
Q & A
Group A – Choy, Rabiei, Sun
Force Analysis
Simplified model of scissor link mechanism
B
F
HG
J
W
C
ID
E
G
A
N
K L
M
S
R P
Q
My
Nx
Ny
Presentation
Overview
Introduction
Engineering
Specifications
Design
MethodologyForce Analysis
FEA & Design
Optimization
Conclusion
Q & A
8/12/2019 MIE441_2008_PPT11
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Group A – Choy, Rabiei, Sun
Force Analysis
Different sections to find forces at nodes
Two different orientations of links considered
Fully lowered
Fully raised
F
J
DE
G Hx
AEy
BD
y
BD
xIJ
AEx
W
PresentationOverview
Introduction
Engineering
Specifications
Design
Methodology
Force Analysis
FEA & Design
Optimization
Conclusion
Q & A
Group A – Choy, Rabiei, Sun
Static equilibrium equations and necessary
dimensions of the scissor links entered to Excel
All equations solved using Excel solver to find
the unknown forces at the nodes
Forces used for FEA
Force Analysis
F
Hx
Hy
IJ
BDyFx
Fy
H
D
H
BDx
mg
Link DH
Constraints LHS RHS
Moments at F 0.00 0
y - Forces 0.00 0
x - Forces 0.00 0
Presentation
Overview
Introduction
Engineering
Specifications
Design
MethodologyForce Analysis
FEA & Design
Optimization
Conclusion
Q & A
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Group A – Choy, Rabiei, Sun
FEA & Design Optimization
Hydraulic Cylinder Mount
Material: AISI 4340 Steel
First Iteration
Loading Conditions Mesh: 3.25mm Von Mises Stress
4.43E+08Pa
(FOS = 1.6)
PresentationOverview
Introduction
Engineering
Specifications
Design
Methodology
Force Analysis
FEA & Design
Optimization
Conclusion
Q & A
Group A – Choy, Rabiei, Sun
FEA & Design Optimization
Hydraulic Cylinder Mount
Fillet (2mm) and contact area (to 15 mm)
Fillet increased to 5 mm
Max Von-Mises
4.45E+08Pa
(FOS 1.6)
Presentation
Overview
Introduction
Engineering
Specifications
Design
MethodologyForce Analysis
FEA & Design
Optimization
Conclusion
Q & A
Max Von-Mises
3.22E+08Pa
(FOS 2.2)
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Group A – Choy, Rabiei, Sun
Conclusion
Scissor lift mechanism
Raise platform by 3 metres
Platform can support 2 people
Force analysis performed scissor lift
Utilized Excel solver to find forces
FEA Analysis and Design Optimization
Satisfies factor of safety of 2
PresentationOverview
Introduction
Engineering
Specifications
Design
Methodology
Force Analysis
FEA & Design
Optimization
Conclusion
Q & A
Group A – Choy, Rabiei, Sun
Questions?
Thank you for listening
Presentation
Overview
Introduction
Engineering
Specifications
Design
MethodologyForce Analysis
FEA & Design
Optimization
Conclusion
Q & A