The field test and calculation analysis for unstable vibration of 320MW turbomachinery rotor-bearing systems

Abstract

Unstable vibration of rotor-bearing systems often occurs on large turbomachineries, which affects the normal operation and the equipment safety. However, the diagnosis for this defect is sometimes difficult in the field. This paper presents some examples of this unstable vibration concerning 320MW units, and introduces the field test procedure and calculation analysis for investigating the instability characteristics and detecting the causes of this fault. The results show that this vibration is induced by steam flow, and the causes of the fault is the improper construction design, operational parameters and others. This paper can be a reference to diagnose similar defects on large turbomachineries and troubleshooting.

Keywords:

• Unstable vibration
• flow induced vibration
• diagnosis
• field test
• calculation

Additional information

Notes on contributors

S Lu

Songyuan Lu is Professor and Director of the Vibration Control and Information System Institute for Southeast University, in Nanjing, China. His major research interests are rotordynamics, vibration theory, vibration measurement and analysis methods, balance moving in the site, fault diagnosis, condition monitoring and condition-based maintenance of rotating machinery, especially of turbomachineries. He began work in this field in 1969 and has since provided engineering support to power plants of China regarding important vibration problem solving, design improvement, new technology application.

During the course of his work, Songyuan has developed an effective method for instability calculation of rotor-bearing system, nonlinear vibration calculation, and analysis and troubleshooting for real units. He has authored a book and close to 200 research papers and technical reports dealing with this area.

Songyuan received his BS (Mechanical Engineering) in 1969 from Xi’an Jiaotong University and MS (Mechanical Engineering) in 1981 from same university. He worked as a senior engineer at Xi’an Thermal Power Research Institute for 14 years and began his research and teaching work to now in Southeast University from 1994. He is a committeeman of the Vibration Committee of China, a member of ASME, and a member of ISO/TC108/SC5.

J Wang

Huiling Fu is an engineer of the Vibration Control and Information System Institute for Southeast University, in Nanjing, China. She is responsible for stability and unbalance response calculation, numerical analysis of rotor-bearing system of turbogenerator units.

Huiling received her BS (Mechanical Engineering) in 1969 from Xi’an Jiaotong University. She worked as an engineer at Southeast University from 1994.

H Fu

Yuankui Ma is an engineer of Nanjing Automation Research Institute, in Nanjing, China. His main focus is vibration analysis and diagnosis of rotating machinery. Yuankui has written 10 technical papers in this area.

Yuankui obtained his BS (Power Engineering) in 1997 from North China Electrical Power University and a PhD degrees (Power Engineering) in 2002 from Southeast University

Y Ma

Jiang Wang is a postgraduate of Power Engineering Department of Southeast University in Nanjing, China. His interests include rotordynamics, vibration analysis, data procedure, artificial intelligence and fault diagnosis. Before his study on vibration in Southeast University, he worked as an engineer for 4 years in Guozhen Energy Group in Anhui of China. He has authored 12 technical papers in this area.

Jiang graduated from Nanjing Power College in 1996.