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Welcome to EG 11111-05Introduction to Engineering Systems: Learning Center
+The people
Instructor Dr. Andrés Tovar [email protected] Office hours: Mon 3 to 5 PM
Student Assistant Tommy Walton [email protected]
Learning Center Manger Natalie Gedde
+The course schedule
Week 1: Build a tower and collect data
Week 2: Learn about Matlab
Week 3: Model the tower with SAP2000
Week 4: Compare and analyze results
Week 5: Optimize the tower layout
Week 6: Test the new structure
+Some towers
Sears Tower
Designed by Skidmore, Owings, and Merrill. Construction started in 1970 and completed and opened in 1973. Located on Wacker Drive in Chicago. It is 1,450 feet tall. The Sears Tower is 110 stories high and the antennas are over 200 feet tall.
Burj Dubai: the world tallest building
Designed by Skidmore, Owings, and Merrill. Construction started in 2004 and will be completed and opened in 2009. Located on Sheikh Zayed Road in Dubai. It is height is kept private but as 01/17/09 was 2,684 ft.
http://www.burjdubai.com/
Hymenocallis flower
The Chicago Spire
Designed by Santiago Calatrava. Construction started in 2007. Located on Lake Shore Drive in Chicago. It is height will be 2,000 ft.
The Ren Building, Shanghai 2010. The rotating tower by David Fisher, Dubai
+The basics – our little tower
+Measuring deflection
A common convention in science and engineering is to express accuracy and/or precision implicitly by means of significant figures.
When not explicitly stated, the margin of error is understood to be one-half the value of the last significant place.
For example, recording of 2.39 mm would imply a margin of 0.005 mm. Recording of 2.4 mm would imply a margin of error of 0.05 mm.
+How to read the dial
Resolution is the smallest possible change that can be detected. Our dial gauge have a resolution of 1/100 mm or 0.01 mm.
In an instrument, the margin of error or degree of accuracy is half a unit each side of the unit of measure.
For example, if our instrument’s resolution is 1 then any value between 6½ and 7½ is measured as 7 and the error is 0.5.
+How to read the dial
In this example the measure is 20.87 mm; however, a measure can be also estimated to 20.869. In either case, the error is 0.005 mm.
+Testing considerations
Test stands on the floor
Systematic testing 2 people add weights 2 people read displacement 2 people record
Load statically
Reset tower between trials
Complete one full trial before starting another
