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

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F 3 . The value of the work of nonconservative forces in the system
when w > w* is positive, and this means that work is supplied to
C
the system. This work is expended on increasing the amplitude of
vibrations.
Since positive work is performed only by hydrodynamic force F 2
which depends on the angular velocity of the rotor, the energy of
rotation, i.e., the power of the drive, is spent on vibration.
From this analysis we can obtain a few more results if we
examine the effect of the pressure drop on the characteristics of
the bearing.
Earlier it was shown that coefficient k 1 is proportional to
the pressure drop in the bearing Ap, while coefficients k 2 and k3
are proportional to
($)I = (tx 1 n* =
where wlX'
drop Ap = 1.0 daN/cm.
nx, nx are the corresponding quantities during pressure
Then the natural frequency of rotor vibration depends on the
pressure drop in
the bearings:
(02 + &.)2 AJ
2'
W h en Ap -0 w0 - 0, w h i le w h e n Ap - c w0 4 W2 "
For rotors of pumps and turbogenerators in an extraterrestrial
engine with high rigidity and a high frequency of natural vibrations
on the rigid supports, in order to reduce the expenditure of power
on the vibration of the wurking medium through the bearing, we
attempt to rctkce the pressure drop in the bearings, i.e., in order
that
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