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Out of balance rotating system

  1. May 6, 2013 #1
    Figure Q4. illustrates a rotor assembly with out-of-balance rotor discs in planes A, B
    and C. The out-of-balance mass x radius products in planes A and C are as
    indicated in the figure. The out-of-balance mBrB in plane B and its angular position [itex]\Theta[/itex]B
    are such that the system is in static balance.

    (a) Determine the values of mBrB and [itex]\Theta[/itex]B.

    (b) If the system is to be dynamically balanced by adding balancing masses m1r1
    and m2r2 in planes A and C, respectively, determine their values and angular
    positions [itex]\Theta[/itex]1 and [itex]\Theta[/itex]2.

    Any help is much appreciated!

    Attached Files:

    Last edited: May 6, 2013
  2. jcsd
  3. May 6, 2013 #2


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    What don't you understand about part a?
  4. May 6, 2013 #3
    well how to do it, in my lecture notes I says to take moments about a point, so I chose to go about point A. so from that I drew a moment polygon. I need to find sommething called a closing vectpr, I presume so thwt from point C I cwn return to point A therfore using some angles and other maths calculate a values for the question. I just dont know how to ge the closing vector.
  5. May 6, 2013 #4
    sorry for the horrid spelling my tablet keyboard is crap
  6. May 6, 2013 #5


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