Mechanism Feasibility Design Task Dr. James Gopsill Design & - - PowerPoint PPT Presentation

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Mechanism Feasibility Design Task Dr. James Gopsill Design & - - PowerPoint PPT Presentation

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2017 Mechanism Feasibility Design Task Dr. James Gopsill Design & Manufacture 2 Mechanism Feasibility Design 1 Lecture 1 2017 Contents 1. Teaching Aims 2. Multi-Bar Mechanisms 3. Feasibility Design 4. Exercise 5. Design

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SLIDE 1

Mechanism Feasibility Design Task

  • Dr. James Gopsill

2017 1 Design & Manufacture 2 – Mechanism Feasibility Design Lecture 1

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SLIDE 2

Contents

1. Teaching Aims 2. Multi-Bar Mechanisms 3. Feasibility Design 4. Exercise 5. Design Process 6. Previous Years 7. Timeline & Resources 8. Skills Applied 9. After Reading Week Prep

2 2017 Design & Manufacture 2 – Mechanism Feasibility Design Lecture 1

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SLIDE 3

Teaching Aims

1. Provide awareness of mechanisms and their applications 2. Further practice design thinking, rationale capture and build on the feedback from the previous coursework 3. Apply system modelling tools to preliminary design scenarios 4. To generate a feasible mechanism design for the design task 5. Practice your theoretical engineering knowledge in an unconstrained and unfamiliar environment

3 2017 Design & Manufacture 2 – Mechanism Feasibility Design Lecture 1

Teaching Aims Multi-Bar Mechanisms Feasibility Design Exercise Design Process Previous Years Skills Applied Prep T&R

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SLIDE 4

Multi-Bar Mechanisms are often used to:

  • Translate motions & forces
  • Improve the performance of a product
  • Simplify the control system of a product
  • Increase the efficiency of a product
  • Deploy a product

4 2017 Design & Manufacture 2 – Mechanism Feasibility Design Lecture 1

Teaching Aims Multi-Bar Mechanisms Feasibility Design Exercise Design Process Previous Years Skills Applied Prep T&R

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SLIDE 5

Translation of Motion & Force

  • Piston
  • Window Hinge
  • Windscreen Wipers
  • Locking Pliers/Vice Grips
  • Provide a Mechanical

Advantage

5 2017 Design & Manufacture 2 – Mechanism Feasibility Design Lecture 1

Teaching Aims Multi-Bar Mechanisms Feasibility Design Exercise Design Process Previous Years Skills Applied Prep T&R

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SLIDE 6

Improving the Performance of a Product

  • Widely used in suspension

design

  • Double wishbone
  • Enables camber control as

a car rolls (positive camber gain)

6 2017 Design & Manufacture 2 – Mechanism Feasibility Design Lecture 1

Teaching Aims Multi-Bar Mechanisms Feasibility Design Exercise Design Process Previous Years Skills Applied Prep T&R

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SLIDE 7

Simplify the Control System of a Product

  • Level-luffing cranes
  • Maintain a steady

platform

7 2017

https://www.youtube.com/watch?v=Qhis3_I2_-0

Design & Manufacture 2 – Mechanism Feasibility Design Lecture 1

Teaching Aims Multi-Bar Mechanisms Feasibility Design Exercise Design Process Previous Years Skills Applied Prep T&R

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SLIDE 8

Deploying a Product

  • Scissor Jacks
  • Convertible Roofs
  • Satellite Solar

Panels

8 2017 Design & Manufacture 2 – Mechanism Feasibility Design Lecture 1

Teaching Aims Multi-Bar Mechanisms Feasibility Design Exercise Design Process Previous Years Skills Applied Prep T&R

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SLIDE 9

And Art!

9 2017

https://www.youtube.com/watch?v=PG2Xv2ivZZU

Design & Manufacture 2 – Mechanism Feasibility Design Lecture 1

Teaching Aims Multi-Bar Mechanisms Feasibility Design Exercise Design Process Previous Years Skills Applied Prep T&R

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SLIDE 10

Research at Bristol

  • Modelling

chewing

  • Develop Capsules

for Drug Delivery

  • Spherical

mechanisms

10 2017 Design & Manufacture 2 – Mechanism Feasibility Design Lecture 1

Teaching Aims Multi-Bar Mechanisms Feasibility Design Exercise Design Process Previous Years Skills Applied Prep T&R

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SLIDE 11

Feasibility Design

  • 1. Develop your

specification

  • 2. Generate concepts
  • 3. Concept selection
  • 4. Preliminary layout &

design

11 2017 Design & Manufacture 2 – Mechanism Feasibility Design Lecture 1

Teaching Aims Multi-Bar Mechanisms Feasibility Design Exercise

Pahl, G. and Beitz, W., 2013. Engineering design: a systematic approach. Springer Science & Business Media.

Design Process Previous Years Skills Applied Prep T&R

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SLIDE 12

Exercise To design a mechanism to deploy and retract a car convertible roof

12 2017 Design & Manufacture 2 – Mechanism Feasibility Design Lecture 1

Teaching Aims Multi-Bar Mechanisms Feasibility Design Exercise Design Process Previous Years Skills Applied Prep T&R

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SLIDE 13

Exercise

13 2017 Design & Manufacture 2 – Mechanism Feasibility Design Lecture 1

Teaching Aims Multi-Bar Mechanisms Feasibility Design Exercise Design Process Previous Years Skills Applied Prep T&R

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SLIDE 14

Design Process

14 2017

Product Design Specification

Design & Manufacture 2 – Mechanism Feasibility Design Lecture 1

No. Requirement Must/Wish Method of Assessment Success Criteria Will be assessed during the feasibility stage 1 2 3 … Teaching Aims Multi-Bar Mechanisms Feasibility Design Exercise Design Process Previous Years Skills Applied Prep T&R

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SLIDE 15

Design Process

15 2017

Product Design Specification Concept Design

Design & Manufacture 2 – Mechanism Feasibility Design Lecture 1

Teaching Aims Multi-Bar Mechanisms Feasibility Design Exercise Design Process Previous Years Skills Applied Prep T&R

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Design Process

16 2017

Controlled Convergence Andy Greener 1st Year Notes

Product Design Specification Concept Design Concept Selection

Design & Manufacture 2 – Mechanism Feasibility Design Lecture 1

Teaching Aims Multi-Bar Mechanisms Feasibility Design Exercise Design Process Previous Years Skills Applied Prep T&R

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SLIDE 17

Design Process

17 2017

Product Design Specification & Linkage Concept Design Submission (5%, pass/fail)

Product Design Specification Concept Design Concept Selection Stage-Gate

Design & Manufacture 2 – Mechanism Feasibility Design Lecture 1

No. Requirement Must/Wish Method of Assessment Success Criteria Will be assessed during the feasibility stage 1 2

Teaching Aims Multi-Bar Mechanisms Feasibility Design Exercise Design Process Previous Years Skills Applied Prep T&R

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SLIDE 18

Design Process

18 2017

1st Year & A-Level Engineering Maths Equations of Motion, Torque, Gravity, Gear Ratios & Motor Power Product Design Specification Concept Design Concept Selection Deployment Modelling Stage-Gate

Design & Manufacture 2 – Mechanism Feasibility Design Lecture 1

Teaching Aims Multi-Bar Mechanisms Feasibility Design Exercise Design Process Previous Years Skills Applied Prep T&R

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SLIDE 19

Design Process

19 2017

Product Design Specification Concept Design Concept Selection Deployment Modelling Motor, Gear Ratio & Damping Selection Stage-Gate

Design & Manufacture 2 – Mechanism Feasibility Design Lecture 1

Teaching Aims Multi-Bar Mechanisms Feasibility Design Exercise Design Process Previous Years Skills Applied Prep T&R

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Design Process

20 2017

𝐺

𝑡 = 𝐺𝑢 tan 𝛽

𝐺𝑢 = 2𝑈 𝑒

Product Design Specification Concept Design Concept Selection Deployment Modelling Motor, Gear Ratio & Damping Selection Gearbox Design Stage-Gate

Design & Manufacture 2 – Mechanism Feasibility Design Lecture 1

Teaching Aims Multi-Bar Mechanisms Feasibility Design Exercise Design Process Previous Years Skills Applied Prep T&R

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SLIDE 21

Design Process

21 2017

Product Design Specification Concept Design Concept Selection Deployment Modelling Motor, Gear Ratio & Damping Selection Gearbox Design Submission

  • Stage-gate submission (5%, pass/fail)
  • Design Report (LaTeX Template provided)
  • Title page
  • Introduction (1 page)
  • Product Design Specification (1 page, 10%)
  • Concept Design & Selection (2 pages, 10%)
  • Deployment Modelling (3 pages, 15%)
  • Motor, Gear Ratio & Damping Selection (3 pages, 15%)
  • Gearbox Design (3 pages, 15%)
  • Solution Specification (1 page)
  • Conclusion & References (1 page)
  • A3 Print Out of Simulink Model (10%)
  • A3 Assembly Drawing of the Gearbox (10%)

Additional Notes:

  • 10% of the mark is awarded to the quality of the report writing
  • The reference list may go beyond the 15 page limit

Stage-Gate

Design & Manufacture 2 – Mechanism Feasibility Design Lecture 1

Teaching Aims Multi-Bar Mechanisms Feasibility Design Exercise Design Process Previous Years Skills Applied Prep T&R

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SLIDE 22

22 2017 Design & Manufacture 2 – Mechanism Feasibility Design Lecture 1

Previous Years

Teaching Aims Multi-Bar Mechanisms Feasibility Design Exercise Design Process Previous Years Skills Applied Prep T&R

https://www.youtube.com/watch?v=5yb7UNZG4nk

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Timeline

23 2017 Design & Manufacture 2 – Mechanism Feasibility Design Lecture 1

Teaching Aims Multi-Bar Mechanisms Feasibility Design Exercise Design Process Previous Years Skills Applied Prep T&R

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Resources

24 2017 Design & Manufacture 2 – Mechanism Feasibility Design Lecture 1

  • https://jamesgopsill.github.io/

MechanismDesign/

  • YouTube Demos for Simulink
  • All New This Year!

Teaching Aims Multi-Bar Mechanisms Feasibility Design Exercise Design Process Previous Years Skills Applied Prep T&R

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SLIDE 25

Feedback

25 2017 Design & Manufacture 2 – Mechanism Feasibility Design Lecture 1

  • 6 x 4 Hour Tutorial Sessions
  • 8 Academic Staff Available to Answer Questions
  • Shaft Design Report
  • Stage-Gate
  • Mechanism Design Report

Teaching Aims Multi-Bar Mechanisms Feasibility Design Exercise Design Process Previous Years Skills Applied Prep T&R

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Engineering Knowledge & Skills

26 2017

Engineering Design Concept Generation Problem Definition Kinematics Systems Modelling Concept Selection Selection Design Gears Motors Damping

Design & Manufacture 2 – Mechanism Feasibility Design Lecture 1

Teaching Aims Multi-Bar Mechanisms Feasibility Design Exercise Design Process Previous Years Skills Applied Prep T&R

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SLIDE 27

After Reading Week

  • Pair Up!
  • Familiarise yourself with the

exercise

  • Initial research to build your

Product Design Specification

27 2017 Design & Manufacture 2 – Mechanism Feasibility Design Lecture 1

Teaching Aims Multi-Bar Mechanisms Feasibility Design Exercise Design Process Previous Years Skills Applied Prep T&R

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SLIDE 28

Q & A

Design & Manufacture 2 – Mechanism Feasibility Design Lecture 1 28 20 February 2017