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Engineering: The Impact of Mistakes

dean-hoffman avatar
dean-hoffman
28 diapositives · 370 Views · Nov 28, 2014

Explore the consequences of engineering miscalculations through real incidents. Understand why engineering classes and accuracy matter through insightful examples.

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Engineering: The Impact of Mistakes
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  1. Engineering Why are you here? Do Engineering classes matter? Or Is a C good enough?

  2. One day you are working at your desk and your boss walks in and says….. “You know that tower you designed? The work site called and said they have a problem. Go down there and see if you can straighten it out for them!”

  3. When you arrive you see……..

  4. I knew I shouldn’t have slept in Mr. Sprague’s Engineering Class! Seven people died in this incident! Source: http://ethics.tamu.edu/ethics/tvtower/tv3.htm#photographs

  5. The collapse of the tower during construction was the result of an incorrect engineering calculation. Video Going up Video of the collapse Pictures

  6. Model used by riggers T Free body diagram used by riggers FB FA Model riggers should have used Engineering gone wrong How much force on each bolt? FA = FB =T/2 What factor of safety would you use? How much force on each bolt? FB=(L/d)T FA=(L/d-1)T Free body diagram riggers should have used Note: L/d=6

  7. Engineering Does it matter? Or Is a C good enough?

  8. One day you are working at your desk and your boss walks in and says….. “You know that math floating point unit you designed on our last chip, there are some posts on the Web about it… Look into it.

  9. You start reading the posts… Dr. Thomas Nicely, Professor of Mathematics at Lynchburg College independently discovered a bug and posted a message on the Internet. The bug only showed up in obscure math computations. You tell your boss that the errata is a very small math error and unlikely that most users would even see it….

  10. NOT!!! No Big Deal… Intel's stated that it was minor and "not even an erratum“. This was not accepted by many computer users. The bug was easy to replicate by an average user (there was a sequence of numbers one could enter into the OS calculator to show the error), During Thanksgiving 1994, The New York Times ran a piece spotlighting the error. Intel changed its position and offered to replace every chip, quickly putting in place a large end-user support organization. This resulted in a $500 million charge against Intel's 1994 revenue.

  11. One day you are working at your desk and your boss walks in and says….. “You know that electrical towers you designed? The NE US has lost power. They think something is wrong with your towers. Go see what the problem is!”

  12. When you arrive you see……..

  13. Oh, here is that missing negative sign!

  14. What is the load held by the nut here?

  15. Engineering Classes Does it matter? Or Is a C good enough?

  16. Homework • Why Good Engineering is Important • Research an engineering failure. • What happened? • Why did it fail? • What were the consequences? • One page double spaced-typed. • Due in class on Friday