1 E 10 JF Induction Mechanical Manufacturing Engineering

1 E 10 JF Induction Mechanical & Manufacturing Engineering 1 E 10 Engineering Design II “The Mighty Roman Mangonel”. 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 2 pm: Everyone to attend Dr. Gareth J. Bennett Trinity College Dublin Page 10

Dr. Gareth J. Bennett Trinity College Dublin Page 11

Friday Lectures Lec 1 Friday 22 Jan. Ham 4 -Joly 14: 00 -15: 00 Dr. Gareth Bennett Project Briefing & Dynamics Lec 2 Friday 29 Jan. Ham 4 -Joly 14: 00 -15: 00 Dr. Roger West Why things fail Lec 3 Friday 5 Feb. Ham 4 -Joly 14: 00 -15: 00 Dr. Roger West Designing against Structural Failure Lec 4 Friday 12 Feb. Ham 4 -Joly 14: 00 -15: 00 Dr. Brian Foley Introduction to Digital Electronics Lec 5 Friday 19 Feb. Ham 4 -Joly 14: 00 -15: 00 Prof. David Taylor How to Choose the Right Material Lec 6 Friday 26 Feb. Ham 4 -Joly 14: 00 -15: 00 Prof. John Fitzpatrick The Role of Modelling in Engineering Design Lec 7 Friday 12 Mar Ham 4 -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 2 pm: 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

Dr. Gareth J. Bennett Trinity College Dublin Page 22

Dr. Gareth J. Bennett Trinity College Dublin Page 23

Dr. Gareth J. Bennett Trinity College Dublin Page 24

General Notes Assignments • Submit via Web. CT 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