L.A. Turbine engineers use specialized tools to accurately determine the behavior and diagnosis of rotating structures. This specialized branch of applied mechanics is called Rotor Dynamics and involves analyzing one or more mechanical structures such as rotors, which are supported by bearings and rotate around a single axis. Through analysis of cross-coupled stiffness, cross-coupled damping, and cross-coupled mass, engineers determine critical speeds, complex eigenvectors, and balancing criteria. Campbell Diagrams (frequency interference diagrams) are generated and studied to ensure stable operation in the intended speed range of the machinery being manufactured.