Application of three-dimensional holographic spectrums in the diagnosis of a load-induced rotor thermal bending and elevation fault

It is extremely common for a large-sized rotary machine to undergo a vibration change of its shafting resulting from a load variation during its operation. An abnormal vibration is often triggered by a change of such operating conditions as the transfer torque and thermal state, etc. of a bearing-rotor system experiencing load variations. The authors have combined the load-induced vibration mechanism with three-dimensional holographic spectrum technology and fully utilized the shafting vibration information indicated by a three-dimensional holographic spectrum to identify the three-dimensional holographic spectrum characteristics of different faults, thus providing a new approach for discriminating load-induced vibration faults. The mechanism and three-dimensional holographic spectrum characteristics of a thermal bending and elevation fault have been analyzed. The verification results obtained from on-site data show that the spectrum characteristics in question resulting from a mechanism analysis enjoy a good ability to identify load-induced vibration faults.