Your grades are posted on LMS. I'll bring the graded homeworks to
class for you to pick-up there. If you don't pick them up in class, I
will have them in a box outside the door of my office (JEC 2022) for you
to pick up. If you missed getting your exam in class, you need to see me to
get it.
NOTE: Additional correction to the textbook. Pages 339 and 340, when the critical speed
of a shaft is calculated, it should be based only
on the deflections due to the weight of the shaft and any masses on the shaft, NOT due
to external loads. It is a free vibration analysis. Example 8.3 is wrong as it uses deflections
in the critical speed calculation based on an externally loaded shaft. The deflections
used, should only be due to the weight of the shaft and any elements on the shaft.
Then the deflections need to be calculated at the center of mass of each element
considered.
Prof. Maniatty will be out of town April 27-29. The review for the final will be on
Thursday, April 23 (instead of Monday, April 27, as listed in the syllabus). Prof. Blanchet
will give a guest lecture on Monday, April 27, that will only be 1 hour (noon-1pm) where he
will discuss a case study of a jackscrew wear failure that led to the crash of Alaska Airlines
Flight 281 in 2000. Prof. Blanchet was a consultant on that investigation and has
a unique perspective. The lecture will show how topics covered
in this class, in particular stresses on screw threads (Prof. Blanchet will extend
what we discussed to power screws), wear, and lubrication, are applied in a real
application.
NOTE: I just realized as I was getting ready to put the solutions to HW 12 up
on the course website that I made a mistake in typing the assignment on the website.
I meant to assign problem 13-20 not 13-22. I'm posting the solution to 13-20 instead
of 13-22. Sorry for the error.
The final exam will be on Tuesday, May 5, 11:30-2:30, DCC 308. You are allowed
one 8.5 x 11 inch, hand-written crib sheet, your textbook, and the following
handouts: errata, singularity functions, multiaxial fatigue, shaft corrections,
and weld tables. A sample exam is available above for practice.