modeling

possible test material for ENSC 100W

Design

• What have we covered for design

  • 1. what problem are we solving?
  • 2. is the solution appropriate
  • 3. is this solution feasible

    • generally speaking, engineers do not guess!!!!

      • modeling, prediction, scaling
        • good engineers understand
          • 1. solutions have multiple answers
          • 2. no solution is perfect
          • 3. the trade offs taken are understood and justified

• Mike’s “laws”

  • 1. pick resistors between (300ohm to 56k ohm)
  • 2. when soldering, lowest profile components are installed first
  • 3. never jump a connection over/over a device
  • 4 colour code
  • at SFU you never use the green common ground
  • when is a device friend? too hot to touch

• Efficiency

  • Only engineers really care about efficiency

    • -> tons of steel out/tons of coal in
      • always pay attention to the scaling of the dimension
    • -> when we increase the size look for the efficiency change
      • -> scalar
        • any unit can be applied anywhere

• Mental models

  • -> mental models is any thing that helps the user to understand

    • they are good when they simplifying for users
      • bad when making how the actual working of a thing is simplified to be wrong

• Human behaviour

  • People as explanatory creatures

    • why do people hit buttons multiple times when first try fails?
      • “in the absence of external informations, people are free to let their imaginations run free as long as the mental models they develop account for the facts”

• Hard to compute problems

  • Turbulent combustion