Analysis on Intrinsic Vibration Characteristics of Disc-Lobe Coupling System of Marine Gas Turbine

Zhuoying Li

doi:10.62177/jaet.v2i1.174

Authors

Zhuoying Li Shanghai Maritime University

DOI:

https://doi.org/10.62177/jaet.v2i1.174

Keywords:

Marine Gas Turbine, Disc-Blade Coupling System, Inherent Vibration Characteristics, Temperature Influence, Rotation Speed Influence

Abstract

As the core component of the modern ship power system, the vibration characteristics of the rotor system are of great importance to the stability and reliability of the whole power system. With the development of lightweight and thin ship gas turbine, the traditional method of only considering the vibration of the blade under the root fixation is no longer applicable. Therefore, it is important to study the vibration characteristics of the wheel and blades as a coupled system. This paper aims to establish the analysis model of the vibration characteristics of the disc-lobe coupling system of Marine gas turbine, and analyze the influence of temperature and rotation speed on the vibration characteristics of the system. Through finite element analysis and experimental verification, this study provides a theoretical basis for the design and safe operation of ship gas turbine. In the process of analysis, this paper first introduces the theoretical basis of the vibration characteristics of the disk-lobe coupled system, including the vibration theory, finite element analysis method, cyclic symmetric structure algorithm, etc. These theoretical bases provide a scientific basis for the subsequent model building and computational analysis. Then, the calculation model of the disc-lobe coupling system of Marine gas turbine is established, and the cyclic symmetry analysis function and geometric nonlinear analysis function of NASTARN is used. In the model, the rotating centrifugal force and the material parameters vary with temperature are consideredinfluence. In addition, the paper verifies the accuracy of the calculation model, and summarizes the relationship between temperature, rotational speed and the intrinsic vibration characteristics of the disk-lobe coupling system. The calculated results and the measured data are also compared. The error sources of the model are analyzed and the practical significance of the experimental results for the design and operation of ship gas turbine is discussed. The results show that the vibration characteristic analysis model of disc-lobe coupled system considering the influence of temperature and rotation speed can provide theoretical support for the design and safe operation of ship gas turbine, and has an important engineering price for improving the reliability and safety of ship power system

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