Design and Stress Analysis of Extraterrestrial ... - The Black Vault

of forces in the absence of pivot vibrations and depend only on
c and Vwe designate Fr and F t
F'O -Fr(8, V 0 , VO =0); PtoFt (8, VO, voO0).
Then the components of the forces in the bearings which arise
during the forward displacement of the pivot can be written in the
form F rl :=F r- F r t, Ft-Fto.
Tlhe projection of these components onto the direction of the
forward velocity of the pivot is designated F., while the projection
onto the perpendicular direction is F l
JcýFiicos V -P.rIsin'iV;
P., =Pjsjf * +Prlco§f)
The characteristics are calculated on a computer. The .,lues of
N, D, Do., L, Jim f M , I K, b, 1, A, U and the values of the parameters
C' v 0 , V 0 , and ~pare given as the initial data. For each of the
parameters a series of values is given, and for all combinations
of parameter value the quantities F rand F are computed.
Usually the e1irection of the projection of force F onto the
vector of forwar'j pivot velocity V is opposite to this vector and
does not depend upon angle ýi. The projection of this same force onto
the direction perpendicu~lar to the forward pivot velocity Tc is also
independent of angle p, but, In magnitude, is less by one order than
the component Tc and is commensurate with calculation error. Therefore,
the quantity F c can be disregarded.
Thefore FrO acting along the center line is directed from the
center of the pivot to the center of the bearing, while the force
F t acting perpendicularly to the center line is directed from the
center of the pivot in the direction of rotor rotation, as indicated
in Fig. 3.85.
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