The following references were consulted when creating this example problem:
Nelson, H.D. & McVaugh, J. M. (May, 1976). The dynamics of rotor-bearing
systems using finite elements. ASME Journal of Engineering for
Industry.
Beley, A., Rajakumar, C., & Thieffry, P. (2009). Computational methods for
rotordynamics simulation. NAFEMS World Congress.
