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Engineering 6806

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  1. Engineering 6806 Barriers to Success Barriers

  2. Common Barriers • Team Dynamics • Project Management • Design • Expertise • Construction • Programming • Debugging Barriers

  3. Team Dynamics Barriers • Egos • Animosity • Poor skills mix • Drones • Belicheck • Smart • Skilled • Character Barriers

  4. Project Management Barriers • Unrealistic planning • Failure to revise • Integration • Poor use of resources • Lack of contingencies Barriers

  5. Design Barriers • Poor partitioning • Confusion between functional and physical • Inadequate definition of interfaces • Failure to analyze • Failure to design • Cut and try Barriers

  6. Research Experiment Understanding Design Read Design Barriers

  7. Expertise as a Barrier • Two kinds of knowledge • Based on understanding (engineering) • Expertise (narrow, detailed, specific) • Modern subsystems demand expertise • Expertise • Short half-life • Constant replenishment • Learn how to acquire it Barriers

  8. Construction Barriers • Poor physical construction • Lots of wear and tear • Multiple people at work • Time – time – time! • Technician work – but engineer is responsible • Wiring • Noise Barriers

  9. Noise • Motors are noisy • radiation from brush arcing • Hbridges are noisy • High speed, high power switching • Environment may be noisy • Noise contaminates analog ckts. & sigs • Noise causes errors in digital circuits Barriers

  10. Noise defenses • Measurement • power and ground lines • separation • filtering • wiring layout • shielding • immunity/recovery Barriers

  11. Bypass Capacitors Barriers

  12. Bypass Capacitors Source: http://www.seattlerobotics.org/encoder/jun97/basics.html Barriers

  13. Wiring • Neat • Robust • Due regard to noise • http://www.4qd.co.uk/serv/appnotes/RCWiring.html Barriers

  14. Barriers

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  18. Inefficient Programming • Embedded processors • constrained in space • constrained in time • Know your instruction times • Look for efficient algorithms • boolean ops instead of series of if statements • look-up tables instead of calculation Barriers

  19. Efficient Programming • Time budget • Overall control strategy • Interrupts • Don't oversample • Considered embedded assembler code Barriers