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

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3. Page 3 Dr. Gareth J. Bennett Trinity College Dublin Objective A small model Mangonel

4. Page 4 Dr. Gareth J. Bennett Trinity College Dublin Objective Can we predict the distance?

5. Page 5 Dr. Gareth J. Bennett Trinity College Dublin Objective A larger version!

6. Page 6 Dr. Gareth J. Bennett Trinity College Dublin Objective What are the factors that control the distance? (The dynamics)

7. Page 7 Dr. Gareth J. Bennett Trinity College Dublin Design Project – Mangonel Conceive DesignImplement Operate

8. Page 8 Dr. Gareth J. Bennett Trinity College Dublin Design Project – Mangonel Conceive DesignImplement Operate

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10. Page 10 Dr. Gareth J. Bennett Trinity College Dublin Design Project – Mangonel Conceive DesignImplement 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

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12. Page 12 Dr. Gareth J. Bennett Trinity College Dublin Lec1Friday 22 Jan.Ham4-Joly14:00-15:00Dr. Gareth BennettProject Briefing & Dynamics Lec2Friday 29 Jan.Ham4-Joly14:00-15:00Dr. Roger WestWhy things fail Lec3Friday 5 Feb.Ham4-Joly14:00-15:00Dr. Roger WestDesigning against Structural Failure Lec4Friday 12 Feb.Ham4-Joly14:00-15:00Dr. Brian FoleyIntroduction to Digital Electronics Lec5Friday 19 Feb.Ham4-Joly14:00-15:00Prof. David TaylorHow to Choose the Right Material Lec6Friday 26 Feb.Ham4-Joly14:00-15:00Prof. John FitzpatrickThe Role of Modelling in Engineering Design Lec7Friday 12 MarHam4-Joly14:00-15:00Dr. Ciaran SimmsSimulation in Engineering Design Friday Lectures

13. Page 13 Dr. Gareth J. Bennett Trinity College Dublin Design Project – Mangonel Conceive DesignImplement 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!

14. Page 14 Dr. Gareth J. Bennett Trinity College Dublin 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 project

15. Page 15 Dr. Gareth J. Bennett Trinity College Dublin Design Project – Mangonel Conceive DesignImplement Operate

16. Page 16 Dr. Gareth J. Bennett Trinity College Dublin 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? Modules within project

17. Page 17 Dr. Gareth J. Bennett Trinity College Dublin Structural Analysis Can design Diameter of arm Diameter of spindle Design Project – Mangonel Conceive DesignImplement Operate

18. Page 18 Dr. Gareth J. Bennett Trinity College Dublin 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. Modules within project

19. Page 19 Dr. Gareth J. Bennett Trinity College Dublin Design Project – Mangonel Conceive DesignImplement Operate Measure Arm Velocity Instrumentation Software Hardware Result is a useful measurement tool!

20. Page 20 Dr. Gareth J. Bennett Trinity College Dublin 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! Modules within project

21. Page 21 Dr. Gareth J. Bennett Trinity College Dublin Design Project – Mangonel Conceive DesignImplement 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

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25. Page 25 Dr. Gareth J. Bennett Trinity College Dublin 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

26. Page 26 Dr. Gareth J. Bennett Trinity College Dublin Good luck!