Welcome to EML3041

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Welcome to EML3041
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No cell phone in my class

• The fate of a cell phone ringing

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EML 3041

• Computational Methods
• Summer 2008
• 1030-1230 (MWF)
• Dr. Autar Kaw

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What do we do when we have a problem?
Graphic from Numerical Methods by Chapra and
Canale
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BRIDGEof LIONS (1927)
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Bascule Bridge THG
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Bascule Bridge THG
Hub
Trunnion
Girder
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Trunnion-Hub-Girder Assembly Procedure
Step1. Trunnion immersed in dry-ice/alcohol Step2.
Trunnion warm-up in hub Step3. Trunnion-Hub
immersed in dry-ice/alcohol Step4. Trunnion-Hub
warm-up into girder
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Problem

• Trunnion Stuck in Hub
• Venetian Causeway Bridge

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Video of Assembly Process
Unplugged Version
VH1 Version
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Consultant calculations show sticking should not
have occurred.
Clearance needed was 0.015 or more
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Thermal Expansion Coefficient Variation with
Temperature
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Roughly estimate the contraction using
trapezoidal rule
Ta80oF Tc-108oF D12.363
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Estimating Contraction Accurately
Change in diameter (?D) by cooling it in dry
ice/alcohol is given by
Ta80oF Tc-108oF D12.363"
?D -0.0137"
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Nonlinear Equations
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Differentiation
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Simultaneous Linear Equations
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Regression
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Interpolation
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Integration
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Ordinary Differential Equations
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Advice from some-one else
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My Advice but Quoting Someone Else

• If you don't let a teacher know at what level you
  are by asking a question, or revealing your
  ignorance you will not learn or grow.
• You can't pretend for long, for you will
  eventually be found out. Admission of ignorance
  is often the first step in our education.
• Steven Covey - Seven Habits of Highly Effective
  People

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Advice from a Guru
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Yes, you want to listen to this