ME 303 PRINCIPLES OF CAE

1. ME 303 PRINCIPLES OF CAE ASST.PROF.DR.HASAN HACIŞEVKİ

2. Reverse Engineering:

3. What is Reverse Engineering? • It is a systematic methodology for analyzing the design of an existing device or system, either as an approach to study the design or as a prerequisite for re-design.

4. Reverse Engineering helps you to: • Develop a systematic approach to thinking about the engineering design of devices and systems • Acquire a mental data bank of mechanical design solutions

5. Levels of Analysis in Reverse Engineering • System-Wide Analysis • Subsystem Dissection Analysis • Individual Component Analysis

6. System-Wide Analysis • Customer Requirements • Engineering Requirements • Functional Specifications • Prediction of Subsystems and Components

7. Subsystem Dissection Analysis • Document Disassembly • Define Subsystems • Determine Subsystem Functional Specifications • Determine Subsystem Physical/Mathematical Principles

8. Individual Component Analysis • Repeat Dissection Steps to Individual Component • Define Component Material Selection and Fabrication Process • Suggest Alternative Designs, Systems, Components, and Materials

9. Example: Ten-Speed Bicycle Customer's Perspective: Provide transportation at moderate speeds, with reasonable comfort,safety, and reliability,without excessive effort, and at an affordable cost. Engineer's Perspective: Transportation of one individual and cargo weighing up to XX pounds, dimensions not to exceed A x B x C, with max speed up to YY mph on level or concrete pavement, sustainable speed of ZZ mph for up to 3 hours, etc.

10. Functional Requirements • Required Speed: affected by weight, gearing, tire size, tire design, frame design, streamlining. • Controllability: affected by handle bar position, dimensions, brake grip design, front tube angle • Safety: • Braking Capability affected by brake materials and design. • Tire Punctureaffected by tire materials, tire construction, tire pressure. • Structureaffected by frame material, thickness, welding, frame design. • Visibility: affected by finish, accessories, lights, reflectors.

11. Functional Requirements (cont.) • Ergonomics: • Riding Comfort affected by seat shape, size, material, positioning, adjustability, suspension, frame size. • Steerability affected by handlebar location and shape, dimensions. • Braking affected by design of brake handgrip, calipers, leverage. • Power Delivery affected by frame size, crankset dimensions, gearing, gearshift location, size, and type. • Economics: • Initial Cost affected by materials, complexity, number of parts, manufacturing methods, sales volume. • Maintenance Cost affected by tire materials, brake materials, durability of components, complexity of subsystem design.

12. Dissection: Subsystem Level Bike Define Subsystems • Frame • Seat • Steering, including handlebar and fork • Wheels, including hubs, spokes, rim, and tires • Power Input, including crankset and foot pedals • Power Transmission, including front and rear deraileurs, gears, gear shift levers, and chain • Brakes, including brake pads, calipers, cables, and handgrips

13. Bathroom Scale Bicycle Pump Can Opener Deadbolt Lock Desktop Clamp Doorknob Assembly Flashlight Hand Tool Hose Nozzle Kitchen Timer Model Car Drive Train Pencil sharpener Pepper Grinder Piston Assembly Pipe Clamp Shower Massage Head Sprinkler Head Stapler Toy Car Toy Gun Example Reverse Engineering Items