1E10 JF Induction
Mechanical & Manufacturing Engineering
1E10 Engineering Design II
“The Mighty Roman Mangonel”.
Dr. Gareth J. Bennett
Dr. Gareth J. Bennett
Trinity College Dublin
Page 1
Dr. Gareth J. Bennett
Trinity College Dublin
Page 2
Objective
A small model Mangonel
Dr. Gareth J. Bennett
Trinity College Dublin
Page 3
Objective
Can we predict the distance?
Dr. Gareth J. Bennett
Trinity College Dublin
Page 4
Objective
A larger version!
Dr. Gareth J. Bennett
Trinity College Dublin
Page 5
Objective
What are the factors that control the
distance? (The dynamics)
Dr. Gareth J. Bennett
Trinity College Dublin
Page 6
Design Project – Mangonel
Conceive
Dr. Gareth J. Bennett
Trinity College Dublin
Design
Implement
Operate
Page 7
Design Project – Mangonel
Conceive
Dr. Gareth J. Bennett
Trinity College Dublin
Design
Implement
Operate
Page 8
Design Project – Mangonel
Conceive
Dr. Gareth J. Bennett
Trinity College Dublin
Design
Implement
Operate
Page 9
Design Project – Mangonel
Conceive
Design
Implement
Operate
Work in teams
•4 streams A, B, C, D
•10 groups per team
•3/6 students per team
Many locations for project work for Tuesday (C&D) and Thursday
(A&B) mornings
Lectures on a Friday at 2pm: Everyone to attend
Dr. Gareth J. Bennett
Trinity College Dublin
Page 10
Dr. Gareth J. Bennett
Trinity College Dublin
Page 11
Friday Lectures
Lec1
Friday 22 Jan.
Ham4-Joly
14:00-15:00
Dr. Gareth Bennett
Project Briefing & Dynamics
Lec2
Friday 29 Jan.
Ham4-Joly
14:00-15:00
Dr. Roger West
Why things fail
Lec3
Friday 5 Feb.
Ham4-Joly
14:00-15:00
Dr. Roger West
Designing against Structural Failure
Lec4
Friday 12 Feb.
Ham4-Joly
14:00-15:00
Dr. Brian Foley
Introduction to Digital Electronics
Lec5
Friday 19 Feb.
Ham4-Joly
14:00-15:00
Prof. David Taylor
How to Choose the Right Material
Lec6
Friday 26 Feb.
Ham4-Joly
14:00-15:00
Prof. John Fitzpatrick
The Role of Modelling in Engineering Design
Lec7
Friday 12 Mar
Ham4-Joly
14:00-15:00
Dr. Ciaran Simms
Simulation in Engineering Design
Dr. Gareth J. Bennett
Trinity College Dublin
Page 12
Design Project – Mangonel
Conceive
Design
Implement
Operate
Work in teams
4 streams A, B, C, D
10 groups per team
3/6 students per team
Many locations for project work for Tuesday (C&D) and Thursday
(A&B) mornings
Lectures on a Friday at 2pm: Everyone to attend
Dedicated demonstrators per location
Continuous assessment based on assignments
•Work Carried out in groups and individually. When assignments are
to be submitted individually work is not to be copied!
Dr. Gareth J. Bennett
Trinity College Dublin
Page 13
Modules within project
Study the dynamics of a Mangonel!
• Understand the parameters that effect the dynamics of
the missile
• Be able to predict the trajectory and distance of a missile
thrown
• Have an understanding of energy exchange between
the Mangonal and the missile
•Use this knowledge to be able to optimise the design
Dr. Gareth J. Bennett
Trinity College Dublin
Page 14
Design Project – Mangonel
Conceive
Dr. Gareth J. Bennett
Trinity College Dublin
Design
Implement
Operate
Page 15
Modules within project
Study the stress and strain of elements of the
model
• We want to be able to fire the missile as far as
possible, however, excessive forces will cause
the Mangonel to break.
• From the structural analysis, can we optimise
the design for strength and power?
Dr. Gareth J. Bennett
Trinity College Dublin
Page 16
Design Project – Mangonel
Conceive
Design
Implement
Operate
Structural Analysis
Can design
•Diameter of arm
•Diameter of spindle
Dr. Gareth J. Bennett
Trinity College Dublin
Page 17
Modules within project
•
Electronic instrumentation
•Design instrumentation which will allow the angular
velocity and acceleration of the arm to be measured.
•Consists of
•Sensors fitted to Mangonel
•Logic design to control sensor outputs
•Software design of micro-processor
•Assembly and operation of instrumentation to measure
parameters on electronic display.
Dr. Gareth J. Bennett
Trinity College Dublin
Page 18
Design Project – Mangonel
Conceive
Design
Implement
Operate
Measure Arm Velocity
•Instrumentation
•Software
•Hardware
Result is a useful
measurement tool!
Dr. Gareth J. Bennett
Trinity College Dublin
Page 19
Modules within project
Build and Test the Mangonel
•The output from the other modules will allow us
to optimally design the Mangonel
• Some components pre-assembled, you have to
finish the model implementing your design
choices
Operate the Mangonel
•Competition at end!
Dr. Gareth J. Bennett
Trinity College Dublin
Page 20
Design Project – Mangonel
Conceive
Design
Implement
Operate
Gareth J. Bennett, Christine Bohan, "Taking a practical approach to very ancient weaponry".
Special report on Science, Engineering and Technology.
The Irish Times, 2008
Dr. Gareth J. Bennett
Trinity College Dublin
Page 21
9 :0 0 - 10 :0 0
G roup 2 0
Week 1
20
20
10
10
11:0 0 - 12 :0 0
20
20
20
L5
L5
L5
L5
Tuesday C6- C10
19 January
D1- D5
L5
L5
L5
L5
L5
L1
L1
L1
L1
L1
L1
L1
L1
L1
L1
D6- D10
L1
L1
L1
L1
L1
L1
L1
L1
L1
L1
A1- A5
L5
L5
L5
L5
L5
L1
L1
L1
L1
B6- B10
L1
L1
L1
L1
3 :0 0 - 4 :0 0
9 :0 0 - 10 :0 0
20
20
20
10 :0 0 - 11:0 0
20
10
10
11:0 0 - 12 :0 0
20
20
20
PHCADLab
ICT
L5
L5
L5
L5
L5
L1
L1
L1
L1
L1
L1
L1
L1
L1
L1
L1
L1
PHCADLab
ICT
Lecture 1- GB
HAM4- Joly
L6
L6
L6
L6
L6
L7
L7
L7
L7
L7
PHCADLab
PHULab
C6- C10 L7
L7
L7
L7
L7
L6
L6
L6
L6
L6
PHULab
PHCADLab
L2
L2
L2
L2
L2
L2
L2
L2
L2
L2
D6- D10 L2
L2
L2
L2
L2
L2
L2
L2
L2
L2
L6
L6
L6
L6
L6
L7
L7
L7
L7
L7
PHCADLab
PHULab
Thursday A6- A10 L7
28 January B1- B5 L2
L7
L7
L7
L7
L6
L6
L6
L6
L6
PHULab
PHCADLab
L2
L2
L2
L2
L2
L2
L2
L2
L2
B6- B10 L2
L2
L2
L2
L2
L2
L2
L2
L2
L2
Tuesday
26 January
D1- D5
A1- A5
Friday
29 January
3 :0 0 - 4 :0 0
PHCADLab
All
C1- C5
2 :0 0 - 3 :0 0
20
PHCADLab
L5
Thursday A6- A10
21 January
B1- B5
2 :0 0 - 3 :0 0
20
C1- C5
Friday
22 January
Week 2
10 :0 0 - 11:0 0
20
All
Dr. Gareth J. Bennett
Trinity College Dublin
ICT
ICT
Lecture 2 - RW1
HAM4- Joly
Page 22
C1- C5
Tuesday
6 April
L11 L11 L11 L11 L11 L12 L12 L12 L12 L12
C6- C10 L11 L11 L11 L11 L11 L12 L12 L12 L12 L12
D1- D5
L13 L13 L13 L13 L13 L14 L14 L14 L14 L14
D6- D10 L14 L14 L14 L14 L14 L13 L13 L13 L13 L13
A1- A5
Thursday
8 April
L11 L11 L11 L11 L11 L12 L12 L12 L12 L12
A6- A10 L11 L11 L11 L11 L11 L12 L12 L12 L12 L12
B1- B5
L13 L13 L13 L13 L13 L14 L14 L14 L14 L14
B6- B10 L14 L14 L14 L14 L14 L13 L13 L13 L13 L13
Week 12
Friday
9 April
A1- A5
L15
L15
A6- A10
L15
L15
B1- B5
L15
L15
B6- B10
L15
L15
C1- C5
L15
L15
C6- C10
L15
L15
D1- D5
L15
L15
D6- D10
L15
L15
PHH
Rugby Pitch
DO
Rugby Pitch
PHULab
Students Choice
Students Choice
PHULab
PHH
Rugby Pitch
DO
Rugby Pitch
PHULab
Students Choice
Students Choice
PHULab
Rugby P itc h
Activity
Location
La bora tory Title
Code
Dynamics of Mangonel - No Drag
L1
Dynamics of Mangonel - With Drag
L2
ICT Lab 2 (Upstairs Computer Hut)
ICT
Design against failure under static actions
L3
Simon Perry Building
SP
Design against failure under dynamic actions
L4
Printing House CAD Lab
Picaxe Simulator
L5
Printing House Undergrad Lab
Software 1
L6
Printing House Hall
Hardware 1
L7
Drawing Office (Museum Buildiing)
Software 2
L8
Hardware 2
L9
Assembly of Mangonel
L10
Spring Test of Mangonel
L11
Distance Test of Mangonel
L12
Speed Test of Mangonel
L13
Mangonel redesign for competition
L14
Competition
L15
Dr. Gareth J. Bennett
Trinity College Dublin
Loc a tions
Loc a tions Code
PHCADLab
PHULab
PHH
DO
Page 23
Dr. Gareth J. Bennett
Trinity College Dublin
Page 24
General Notes
Assignments
• Submit via WebCT 2/3 weeks after the lab-will be announced.
• DO NOT email to me
• Late submissions marked out of 70%
Passwords
•Keep on top of them – tricky.
•Your responsibility
•Use TCD Password Manager:
•http://isservices.tcd.ie/accounts/pwd_manager.php
•Go to help desk of IS Services for help
Dr. Gareth J. Bennett
Trinity College Dublin
Page 25
Good luck!
Dr. Gareth J. Bennett
Trinity College Dublin
Page 26