Introduction to Engineering Design Project Based Learning by gregoria

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									Introduction to Engineering Design:
      Project Based Learning


     Young Engineers and Scientists Seminars

                             Taryn Melkus Bayles, Ph.D.
                  Chemical and Biochemical Engineering Department
                     University of Maryland Baltimore County


    September 22, 2005
    Historical Electronics Museum
Introduction to Engineering Design
        Course Overview
      • Lecture topics
      • Computer / Discussion sessions
      • The design projects
        – Human Powered Pumps
        – Catapults and Trebuchets
        – Hot Air Balloons
        – Wooden Block Transport Devices
        – Chemically Powered Vehicles
        – Hemodialysis System
      • Course Evolution / Evaluation
ENES 101 Lecture Topics
 • Unit Conversions & Dimensional
   Consistency
 • Data Analysis and Representation
 • Strength of Materials
 • Introduction to Statics
 • Introduction to Heat Transfer
 • Design Project
 • Computer Programming
ENES 101 Computer Sessions

   • Microsoft Word
   • Microsoft Excel
   • CAD / ProE
   • Microsoft PowerPoint
   • Computer Programming
ENES 101 Design Project
 • Work in Teams
 • Design and Build Project
 • Test / Demonstrate / Evaluate
   Project Performance
 • Mathematical Model
 • Written Report
 • Oral Presentation
ENES 101 Design Project

 • Team Assignment
   – Application and self assessment
   – 4 - 6 Members
   – Balance
     • Major, gender, ethnicity,
       academics
   – Access to car
ENES 101 Design Project

 • Problem – Based Learning Design
   Projects
   – Human Powered Pumps
   – Catapult or Trebuchet
   – Hot Air Balloon
   – Wooden Block Transport Device
ENES 101 Design Project

  • Human Powered Pump
    – Safety
    – 15 minute set up
    – 15 minute pump time
    – Vertical head of 10 feet
    – Minimize cost < $120
    – Predicted versus actual
      performance
ENES 101 Human Powered Pump
ENES 101 Human Powered Pump
ENES 101 Human Powered Pump
ENES 101 Design Project

 • Catapult or Trebuchet
   – Safety
   – Maximum 4 foot arm
   – Launch activation from 5 feet
   – Minimize cost < $120
   – 5 balloons for distance, 5 balloons
     at target, 1 balloon at professor
   – Predicted versus actual
     performance
ENES 101 Catapults and Trebuchets
ENES 101 Trebuchet
The Perfect Launch
                 Water Balloon
ENES 101 Trebuchet
ENES 101 Catapult/Trebuchet
ENES 101 Trebuchet
ENES 101 Design Project
 • Hot Air Balloon
   –   Safety
   –   Size limited to 2 meter cube
   –   Pre-inflation and thermal heat source
   –   Minimum 12 seconds aloft
   –   Minimum payload of 10 grams
   –   Minimize cost < $ 30
   –   Mathematical model of performance
   –   Bragging Rights:
        • Time aloft x payload x model accuracy
ENES 101 Hot Air Balloon
ENES 101 Project Modeling

 • Hot Air Balloon
   – Design Shape
   – Materials of construction
   – Factors affecting time aloft
     • Pre-inflation of balloon
     • Inside air temperature at lift off
     • Rate of heat transfer
     • Payload & balloon weight
ENES 101 Hot Air Balloon
ENES 101 Design Project
• Wooden Block Transport Device
  – Safety
  – Device must fit in 3 foot cube volume
  – Minimum launch activation from 5 feet
  – Minimize cost < $50
  – Energy source: 2 liter bottle & 8 ‘ height
  – 5 launches for distance, 5 launches at
    target, 1 block launched at professor
  – Mathematical model of predicted
    performance
  – Distance x accuracy x model accuracy
ENES 101 Wooden Block
  Transport Device
ENES 101 Wooden Block
  Transport Device
ENES 101 Wooden Block
  Transport Device
ENES 101 Design Project
• Chemically Powered Vehicles
   – Safety
   – Traverse horizontal distance of 30 to 80
     feet
   – Payload 50 to 300 ml of water
   – Distance and payload announced 2 hours
     prior to testing
   – Size restriction: 18 in x 12 in x 12 in
   – Minimize cost
   – Mathematical model of predicted
     performance
   – Bragging rights
Distance x payload x model accuracy x cost index
Chemically Powered Vehicles
ENES 101 Design Project
• Hemodialysis System
   – Safety
   – Remove the maximum amount of impurities
     from 400 ml of simulated blood
   – Minimum impurities in dialysate 0.0025
     mg/ml
   – Minimize cost < $50
   – Choice of 4 membranes of varying diameters
     and pore size cut offs
   – Mathematical model of predicted
     performance
   – Bragging Rights
Concentration x dialysate cost x model accuracy x device cost
Hemodialysis System
ENES 101 Course Evolution
 • Hands-on Design Project
   – Connection between math and
     science and engineering
   – More informed choice when changing
     majors
   – Class enrollments have increased
   – Higher retention in engineering
   – Greater sense of accomplishment
ENES 101 Course Evaluation
 ABET evaluation criteria
 (a) an ability to apply knowledge of math, science and
    engineering
 (b) an ability to design and conduct experiments, as well as to
    analyze and interpret data
 (c) an ability to design a system, component, or process to
    meet desired needs
 (d) an ability to function on multi-disciplinary teams
 (e) an ability to identify, formulate and solve engineering
    problems
 (g) an ability to communicate effectively
 (i) a recognition of the need for, and an ability to engage in
    life-long learning
 (k) an ability to use the techniques, skills, and modern
    engineering
ENES 101 Course Evaluation
       Introduction to Engineering ABET
                     Survey
                                                                 Poor
                                                                 Fair
                                                                 Good
                                                                 Very Good
             60
                                                                 Excellent


             40
 Number of
 Responses
              20


                  0
                      a                                        Excellent
                          b                                  Very Good
                              c                            Good
                                  d
                                      e                 Fair
                                          g
                  ABET Objective              i
                                                      Poor
                                                                   Ranking
                                                  k
YESS Engineering Challenge
 • Design and construct a mechanism to launch a
   ping pong ball for distance and accuracy:
    – Using only the materials provided
        • 3 plastic cups, 10 tongue depressors, 8 rubber bands, 1
          plastic spoon, 3 small dowel rods, 8 thumb tacks, ping pong
          ball, 1 roll of masking tape and 1 paper bag
    – Two launches for distance and four launches at a target
    – The ping pong ball must be launched (by one selected
      team member) from a stationary position on the table
      (mechanism must be free standing and may not be taped
      to the table)
    – 30 minutes construction time

 • Bragging rights:
    – X*Y
      where:     X – Distance in inches (best of two)
                 Y – Accuracy percentage

								
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