Page 1 Dr. Gareth J. Bennett Trinity College Dublin 1E10 JF Induction Mechanical & Manufacturing Engineering 1E10 Engineering Design II “The Mighty Roman

Dr. Gareth J. BennettTrinity College Dublin

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1E10 JF Induction1E10 JF InductionMechanical & Manufacturing EngineeringMechanical & Manufacturing Engineering

1E10 Engineering Design II“The Mighty Roman Mangonel”.

Dr. Gareth J. Bennett


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ObjectiveObjective

A small model Mangonel


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ObjectiveObjective

Can we predict the distance?


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ObjectiveObjective

A larger version!


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ObjectiveObjective

What are the factors that control the distance? (The dynamics)


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Design Project – Mangonel

Conceive Design Implement Operate


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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


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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

Friday LecturesFriday Lectures


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Work in teams4 streams A, B, C, D10 groups per team3/6 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!


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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

Modules within projectModules within project


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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?



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Structural Analysis

Can design

•Diameter of arm

•Diameter of spindle




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• 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.



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Measure Arm Velocity

•Instrumentation

•Software

•Hardware

Result is a useful measurement tool!


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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!



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Gareth J. Bennett, Christine Bohan, "Taking a practical approach to very ancient weaponry". Special report on Science, Engineering and Technology. The Irish Times, 2008


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Group 20 20 20 20 10 10 20 20 20 20 20 20 20 20 10 10 20 20 20 20

C1-C5 L5 L5 L5 L5 L5

C6-C10 L5 L5 L5 L5 L5

D1-D5 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

A6-A10 L5 L5 L5 L5 L5

B1-B5 L1 L1 L1 L1 L1 L1 L1 L1 L1 L1

B6-B10 L1 L1 L1 L1 L1 L1 L1 L1 L1 L1

Friday22 J anuary

All

C1-C5 L6 L6 L6 L6 L6 L7 L7 L7 L7 L7

C6-C10 L7 L7 L7 L7 L7 L6 L6 L6 L6 L6

D1-D5 L2 L2 L2 L2 L2 L2 L2 L2 L2 L2

D6-D10 L2 L2 L2 L2 L2 L2 L2 L2 L2 L2

A1-A5 L6 L6 L6 L6 L6 L7 L7 L7 L7 L7

A6-A10 L7 L7 L7 L7 L7 L6 L6 L6 L6 L6

B1-B5 L2 L2 L2 L2 L2 L2 L2 L2 L2 L2

B6-B10 L2 L2 L2 L2 L2 L2 L2 L2 L2 L2

Friday29 J anuary

All

PHULab

PHULab PHCADLab

PHCADLab PHULab

PHCADLab

PHCADLab

PHCADLab

PHCADLab

ICT

ICT

ICT

PHCADLab

PHULab PHCADLab

ICT

HAM4- J oly

HAM4- J oly

10:00- 11:00 11:00- 12:00 2:00- 3:00 3:00- 4:009:00- 10:002:00- 3:00

Week 2

11:00- 12:009:00- 10:00 10:00- 11:00

Thursday21 J anuary

Week 1

Lecture 1- GB

Thursday28 J anuary

Lecture 2 - RW1

3:00- 4:00

Tuesday19 J anuary

Tuesday26 J anuary


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C1-C5 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 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

A1-A5

A6-A10

B1-B5

B6-B10

C1-C5

C6-C10

D1-D5

D6-D10

ICT Lab 2 (Upstairs Computer Hut)

Simon Perry Building

Printing House CAD Lab

Printing House Undergrad Lab

Printing House Hall

Drawing Office (Museum Buildiing)

PHULab

PHULab

DO

Students Choice

Rugby Pitch

Rugby Pitch

Students Choice

Students Choice PHULab

Rugby Pitch

PHULab

L12

L13

L14

L8

L9

L10

L11

Week 12

Thursday8 April

Friday9 April

Tuesday6 April

L15

L15

Speed Test of Mangonel

Mangonel redesign for competition

Competition

Activity

Code

L1

L2

L3

L4

L5

Hardware 2

Assembly of Mangonel

Spring Test of Mangonel

Distance Test of Mangonel

Hardware 1

Software 2

L15 L15

Design against failure under dynamic actions

L6

L7

Dynamics of Mangonel - With Drag

Design against failure under static actions

Picaxe Simulator

Software 1

L15

L15 L15

L15

Dynamics of Mangonel - No Drag

L15

L15

L15 L15

L15 L15

L15

L15

PHH

L15

Laboratory Title

DO

Students Choice

PHH Rugby Pitch

DO Rugby Pitch

SP

PHCADLab

PHULab

PHH

Location

Locations Locations Code

ICT


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General NotesGeneral NotesAssignments• 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


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Good luck!

Documents

Page 1 Dr. Gareth J. Bennett Trinity College Dublin 1E10 JF Induction Mechanical & Manufacturing Engineering 1E10 Engineering Design II “The Mighty Roman