1 Scope
This document gives guidelines for identifying:
a) The typical architectures of touch-down bearing systems to show which components are
likely to comprise such systems and which functions these components provide;
NOTE Touch-down bearings are also known as “backup bearings”, “auxiliary bearings”, “catcher
bearings” or “landing bearings”. Within this document, the term “touch-down bearings”
is used exclusively as defined in ISO 14839‑1.
b) The functional requirements for touch-down bearing systems so that clear performance
targets can be set;
c) Elements to be considered in the design of the dynamic system such that rotordynamic
performance can be optimized, both for touch-down bearings and active magnetic bearings
(AMBs);
d) The environmental factors that have significant impact on touch-down bearing system
performance allowing optimization of overall machine design;
e) The AMB operational conditions that can give rise to contact within the touch-down
bearing system so that such events can be considered as part of an overall machine
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BS ISO 14839-5:2022 history
2022BS ISO 14839-5:2022 Mechanical vibration. Vibration of rotating machinery equipped with active magnetic bearings - Touch-down bearings