Axial subsynchronous vibration (SSV) can appear suddenly in turbomachinery and reach amplitudes large enough to threaten rotor components, thrust bearings, and supporting structures. Because axial vibration is rarely monitored, these events often come as a surprise, especially in low‑load or load‑reversal conditions. This paper presents controlled test‑rig data that examines how operating parameters such as load, speed, oil flow, inlet temperature, axial clearance, pivot offset, and lubrication method influence the onset and behavior of axial SSV, offering clearer insight into a phenomenon with limited published research.

Scan DeCamillo
Manager, Research and Development
Kingsbury, Inc.
Philadelphia, PA 19154 USA