Rotordynamics and Machinery
The rotordynamics modeling of rotating machinery has become a relatively mature science in the past 30 years. The importance of rotordynamics has increased over the last few decades as machine speeds have increased and higher flows and efficiencies have had the side effect of introducing problems with critical speeds, unbalance response and rotor stability.
Research & Design – The first objective of rotordynamics is to identify the resonant frequencies present in a system, determine their severity and, if necessary, design the system around them.
Critical Speed Map – One of the most useful tools available to anyone evaluating the rotordynamics of a rotor bearing system is the undamped critical speed map.
Stability Analysis – Associated with every resonance or critical speed is a mode shape. Mode shapes are only defined at resonance and are independent of the forcing function.
In order to use rotor dynamics as a tool to solve machinery problems, one must first look at what factors can be altered to make the machinery operate with less vibration and stress. In most cases this means changing or altering different machine components since replacing a machine is often too costly or impractical.
Malcolm is the Founder of Applied Machinery Dynamics. The company focuses on rotordynamics, bearing and seal design for turbomachinery. Other Specialties: Design Audits, Uprates, and Fixing Vibration Problems.
Our experience as leaders in turbo machinery and rotor dynamics analysis and design services since 1987 offers consistent results every time.