Research on unbalance response characteristics of gas turbine blade-disk rotor system

• Main Authors: Wenjun Yang, Mingxuan Liang, Lei Wang, Huiqun Yuan
• Format: Article
• Language: English
• Published: JVE International 2018-06-01
• Series: Journal of Vibroengineering
• Subjects: blade-disk rotor; transfer matrix analysis; dynamic characteristic; eccentric factor; unbalanced response
• Online Access: https://www.jvejournals.com/article/18765

Taken a gas turbine rotor system as the research object, this paper has established dynamical model based on transfer matrix method. Natural vibration characteristics are solved with different transfer matrix models, and are compared with that gotten by finite element method. Then unbalanced response is researched. The effects of eccentric factors are discussed on unbalanced vibration. Furthermore, the application is explored in rotor dynamic balancing. The results show there is much minor deviation between natural frequencies of transfer matrix method and finite element method, and vibration modes of two methods coincide quite well. It illustrates the model established in the research is reliable. For input side of blade-disk rotor, unbalanced vibration occurs more easily in lower frequency. While unbalanced vibration of output side is more sensitive at higher frequency. With the increase of eccentric mass, unbalanced vibration of blade-disk rotor is more heavily, and the displacement rotates around a fixed node. The application of opposite unbalanced mass can decrease the amplitude of vibration in lower frequency. Hence, it can be used to achieve the balance of rotor dynamics. This research provides the theoretical basis and technological fundament for gas turbine rotor dynamics design.