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Instability Mechanism of Marine Propulsion System with Double-Cylinder Turbines Considering the Effects of System Parameters: Symmetrical Layout and Unsymmetrical Load

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Abstract

Background

When the marine propulsion system with double-cylinder turbines (DCT) works, the phenomena of nonlinear instability such as structural impact, vibration, and noise often occur. The instability is the result of the combined effects of the symmetrical layout and unsymmetrical load. The purpose of this paper is to reveal the instability mechanism of this type of propulsion system theoretically.

Method

First, based on the theory of finite-width journal bearing and gear transmission principle, a lateral–torsional–axial model considering the inertial effects of DCT and the ship propeller is established. Second, the vibration characteristics of the system are studied by numerical analysis. At last, dynamic evolution laws of the coupled system with layout and load parameters are investigated, and the instability mechanism is revealed.

Results

The results indicate that the dynamic characteristics of the system show obvious load ratio-controlled zone and layout angle-controlled zone with the changing of the parameters. Furthermore, the vibration condition of the gear pairs on the low-load side is worse than that on the high-load side. Finally, as the stability of the system decreases, the influence of the oil whip gradually increases.

Conclusion

The research is of great significance for quantifying the stability of the propulsion system and predicting the system stability.

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Funding

This study was supported by a grant from the National Natural Science Foundation of China (No. 11802175) and China Postdoctoral Science Foundation (No. 2019T120339). The authors express their gratitude.

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Authors and Affiliations

  1. State Key Laboratory of Mechanical System and Vibration, Institute of Vibration, Shock and Noise, Shanghai Jiao Tong University, Shanghai, 200240, China

    Jianghai Xu, Chunxiao Jiao, Donglin Zou, Na Ta & Zhushi Rao

  2. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration (CISSE), Shanghai, 200240, China

    Zhushi Rao

Authors
  1. Jianghai Xu
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  2. Chunxiao Jiao
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  3. Donglin Zou
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  4. Na Ta
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Corresponding author

Correspondence to Zhushi Rao.

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Xu, J., Jiao, C., Zou, D. et al. Instability Mechanism of Marine Propulsion System with Double-Cylinder Turbines Considering the Effects of System Parameters: Symmetrical Layout and Unsymmetrical Load. J. Vib. Eng. Technol. 10, 253–271 (2022). https://doi.org/10.1007/s42417-021-00374-y

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  • DOI: https://doi.org/10.1007/s42417-021-00374-y

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