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Engineering 6806
Engineering 6806: Design
Project
Barriers to Success
9/10/02
Barriers
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Common Barriers
Engineering 6806: Design
Project
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Team Dynamics
Project Management
Design
Expertise
Construction
Programming
Debugging
9/10/02
Barriers
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Team Dynamics Barriers
Engineering 6806: Design
Project
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Egos
Animosity
Poor skills mix
Drones
Belicheck
• Smart
• Skilled
• Character
9/10/02
Barriers
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Project Management Barriers
Engineering 6806: Design
Project
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Unrealistic planning
Failure to revise
Integration
Poor use of resources
Lack of contingencies
9/10/02
Barriers
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Design Barriers
Engineering 6806: Design
Project
• Poor partitioning
• Confusion between functional and physical
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Inadequate definition of interfaces
Failure to analyze
Failure to design
Cut and try
9/10/02
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Design
Engineering 6806: Design
Project
Research
Understanding
Read
Experiment
9/10/02
Design
Barriers
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Expertise as a Barrier
Engineering 6806: Design
Project
• 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
9/10/02
Barriers
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Construction Barriers
Engineering 6806: Design
Project
• Poor physical construction
• Lots of wear and tear
• Multiple people at work
• Time – time – time!
• Technician work – but engineer is
responsible
• Wiring
• Noise
9/10/02
Barriers
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Noise
Engineering 6806: Design
Project
• 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
9/10/02
Barriers
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Noise defenses
Engineering 6806: Design
Project
• Measurement
• power and ground lines
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separation
filtering
wiring layout
shielding
immunity/recovery
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Bypass Capacitors
Engineering 6806: Design
Project
9/10/02
Barriers
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Bypass Capacitors
Engineering 6806: Design
Project
Source:
http://www.seattlerobotics.org/encoder/jun97/basics.html
9/10/02
Barriers
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Wiring
Engineering 6806: Design
Project
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Neat
Robust
Due regard to noise
http://www.4qd.co.uk/serv/appnotes/RC
Wiring.html
9/10/02
Barriers
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Engineering 6806: Design
Project
9/10/02
Barriers
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Engineering 6806: Design
Project
9/10/02
Barriers
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Engineering 6806: Design
Project
9/10/02
Barriers
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Engineering 6806: Design
Project
9/10/02
Barriers
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Inefficient Programming
Engineering 6806: Design
Project
• 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
9/10/02
Barriers
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Efficient Programming
Engineering 6806: Design
Project
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Time budget
Overall control strategy
Interrupts
Don't oversample
Considered embedded assembler code
9/10/02
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