Abstract
In this article case studies are presented involving rotordynamic instability of modern high‐speed turbomachinery relating the field data to analytical methods. The studies include oil seal related field problems, instability caused by aerodynamic cross‐coupling in high‐pressure, high‐speed compressors, and hydrodynamic bearing instability resulting in subsynchronous vibration of a high‐speed turbocharger. It has been shown that the analytical tools not only help in problem diagnostics, but also aid in problem resolution. Examples are presented showing how analytical methods, when appropriately applied, can solve rotordynamic instability and result in stable rotor system.
Highlights
In this article case studies are presented involving rotordynamic instability of modern high-speed turbomachinery relating the field data to analytical methods
The studies include oil seal related field problems, instability caused by aerodynamic cross-coupling in high-pressure, high-speed compressors, and hydrodynamic bearing instability resulting in subsynchronous vibration of a high-speed turbocharger
It has been shown that the analytical tools help in problem diagnostics, and aid in problem resolution
Summary
In this article case studies are presented involving rotordynamic instability of modern high-speed turbomachinery relating the field data to analytical methods. The studies include oil seal related field problems, instability caused by aerodynamic cross-coupling in high-pressure, high-speed compressors, and hydrodynamic bearing instability resulting in subsynchronous vibration of a high-speed turbocharger. It has been found that under certain conditions a rotor may precess about the bearing center at a speed below the operating speed Such motion is termed as nonsynchronous, and is due to self-induced vibration (Newkirk and Lewis, 1956). Three case studies are presented related to stability problems associated with high-speed turbomachinery. Vibration data related to the cases have been included, where available
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