METHOD AND APPARATUS FOR DIAGNOSING VIBRATION OF ROTARY MACHINE

摘要

PURPOSE:To enable automatic diagnosis of the occurence of the thermal deformation of a rotor through the realization of a fact that the direction of time-dependent variation and the tendency of the amplitude variation of an unbalanced vibration vector within a fixed time are substantially constant. CONSTITUTION:The vibrations of rotor bearings 41-46 detected by vibration detectors 51-56 are sent to a processing device 10 through a vibrometer 7, a data input device 8 and an A-D converter 9. The processing device 10 extracts the components of the vibrations, while the output of a pulse pickup 6 receives a reference signal which has been processed by a waveform converter 11 or a tachometer 12 for data processing. The processed data is sent to a memory 14 and to a discriminator 15. The discriminator 15 decides if the vibrations are due to unbalance or not. An operator 16 performs the operation of variation vectors. Comparators 17 and 18 check the tendency of phase variation and the tendency of amplitude variation, respectively. A discriminator 19 decides the thermal deformation and the result of decision is indicated in an indicator 21 through a controller 20. Thus automatic diagnosis of the thermal deformation is attained.