where M is the magnification factor, Ax=(Q0=kx), which is also plotted in Figure 3.22
against the nondimensional frequency v=vn and thus
3.5.4 Foundation Vibrations due to Rotating Masses
If the foundation vibrations described in Sections 3.5.1 to 3.5.3 are created by unbalanced
masses (m1 with an eccentricity of e) rotating at an angular frequency of v, then the
following modifications must be made to Equations (3.72), (3.75a), and (3.78):
1. Translational oscillations
Q0 ¼ m1ev2 must be substituted in Equations (3.72) and (3.78) for Q0.
2. Rotational oscillations
My ¼ m1ezv2 must be substituted in Equation (3.75a) for My, where z is the
moment arm of the unbalanced force.
In all of the above cases, the new equations of motion corresponding to Equations
(3.72), (3.75a), and (3.78) have to be solved to determine the resonance frequencies and the
amplitudes of vibrations