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 speaoking, engineers do not guess!!!!

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

• Mikes “laws”

  • 1. pick resistors between (300ohm to 56k ohm)
  • 2. when soldering, lowest profile components are installed first
  • 3. never jump a connecton over/over a device
  • 4 colour code
  • at SFU you never use teh 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 demention
    • → when we increase the size look for the effiencency 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 simplifing for users
      • bad when making how the actual workinging of a thing is simplified to be wrong

• Human behavour

  • People as explanotory creatures

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

• Hard to compute problems

  • Turbulent combustion