1. Physical Graphical Mathematical Statistical
Modelling
Physical
Graphical
Mathematical
Statistical

2. Modelling Models represent reality Crash testing
Dangerous procedures can be simulated
Problems with using models how good are they at simulating reality, or using small scale production runs e.g. cars this is very expensive
And can be dangerous, not just crash testing but cold testing, skid testing, etc, crash dummies are not used, instead very experienced drivers.

3. Modelling
Working out ideas or hypothesis by building physical models

4. Modelling
Using computers to generate mathematical, graphical or statistical models

5. West Point Bridge Designer

6. Modelling using West Point Bridge Designer
Work through the tasks on the worksheet
Use the tables to examine Mathematical modelling
The costing data
The load test data
The members property data
Load test the bridge using the animated graphical interface and test

7. Modelling using Excel
Mathematical data can be hard to understand and read, therefore the information can be graphically represented using Excel
Copy the Cost Calculations Report and paste into Excel
Edit the data so only items that cost, remain in the spreadsheet
Create 2 types of charts to represent the different ‘Types of Costs’
Save and Printout

8. Physical Modelling Making the Warren Thru Truss Bridge
Using the straws and joints to make and test the bridge
Using the plastic maccarno to build and test the bridge
Take photos and record all observations

9. The Purpose of Modelling
Advantages
Time saved
Cost of materials reduced
Computer simulations cost less e.g. car crash testing
Judge peoples reaction e.g. aesthetics
Standardisation
Disadvantages
Simplicity of models lead to aspects being overlooked
Scaled models can be misleading
Mathematical models only as good as the formulas
Computer models create delusions of infallibility

10. Modelling Dennis H. Mahan Memorial Bridge
Cost Calculations Report (Design Iteration #1)
Designed By: I. M. Bridgemaster
11/7/2007
Type of Cost
Cost
Material Cost (M)
$102,197.12
Connection Cost (C)
$3,300.00
Product Cost (P)
$600.00
Deck Cost
$20,000.00
Excavation Cost
$92,000.00
Abutment Cost
$8,000.00
TOTAL COST
$226,097.12
Modelling

11. Modelling
You can model the Warren Thru Truss bridge using Google Sketchup
Try modelling the bridge using another material
Wood
Spaghetti

12. Links http://bridgecontest.usma.edu/download.htm