Fault inspection system for rotary machines

摘要

A fault inspection system for the rotary machine is disclosed in which the rotational speed or a physical quantity related thereto of the rotary machine drive with changing rotational speeds is detected as a first detection signal, and the sound pressure or mechanical vibration from the rotary machine as a second signal. A reference line representing the relationship between the values of the first and second detection signals is determined on the basis of the same values. A fault of the rotary machine is detected on the basis of a third detection signal associated with an area corresponding to the region where the first or second detection signal exceeds the reference line.