Calculation and analysis of torsional vibration of electrical propulsion system under a short-circuit-induced impulse load

LI Zengguang1 ZHAO Hui1 ZHOU Ning2

(1.Shanghai Division, China Ship Development and Design Center, Shanghai, China 201108)
(2.China Ocean Mineral Resources R&D Association, Beijing, China 100045)

【Abstract】[Objectives] For an electrical propulsion system, the transient torque induced by short-circuit faults is so large that it will exert a great impact on the safety of the shipboard electrical propulsion system. In order to evaluate the problem, we propose a simulation method for analyzing the torsional vibration of a propulsion system under a short-circuit-induced torque impulse in the time domain. [Methods] On the basis of the torsional vibration analysis theory, a time-domain model is developed, and the system response to a transient torque impulse induced by a short-circuit fault is expressed. Then by using the proposed simulation model, we calculate and analyze the natural frequencies and response to the transient torque impulse for an electrical propulsion system. [Results] The simulation results show that the dynamic characteristics of the system have a prominent role in the transmission of torque impulse, and components at frequencies above the first resonance frequency see a substantial reduction, so the torque response of the propeller is mainly based on the first resonance frequency component. If an elastic coupling is inserted into the propulsion motor and the shafting, the torque response of the system can be significantly decreased. The peak value increases with motor speed, and vibratory torque can reach several times the value of the mean torque, causing the gears to rattle and the torsion vibratory stress to grow as a result. [Conclusions] The proposed simulation modeling method is suitable for analyzing the torsional vibration response of an electrical propulsion system subject to a short-circuit-induced impulse load, and numerical calculations should be carried out to check the reliability of the system during the design process.

【Keywords】 electrical propulsion system; torsional vibration; short-circuit fault; impulse;


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(Translated by HAN R)


    [1] ZHAO P C. Torsional vibration mechanism and safety analysis of turbo-generator shafts [D]. Beijing: North China Electric Power University, 2019 (in Chinese).

    [2] LI X Q. Characteristics research of shaft vibration in special conditions [D]. Harbin: Harbin Engineering University, 2014 (in Chinese).

    [3] XIA K, SUN Y H, ZHANG F. The coupled electromechanical analysis for gas turbine generators during short circuit fault [J]. Chinese Journal of Applied Mechanics, 2016, 33 (1): 55–60 (in Chinese).

    [4] CHEN Q, CAI L Q, LI X Q, et al. The response analysis due to short-circuit faults for the vibration isolator in a diesel generator set [J]. Chinese Journal of Ship Research, 2013, 8 (3): 66–72 (in Chinese).

    [5] TSAI J I. Design of a short-time compensation capacitor for turbine blade vibration suppression [J]. Electric Power Systems Research, 2007, 77 (12): 1619–1626.

    [6] OGIDI O O, BARENDSE P S, KHAN M A. Fault diagnosis and condition monitoring of axial-flux permanent magnet wind generators [J]. Electric Power Systems Research, 2016, 136: 1–7.

    [7] XIANG L, YANG S X, TANG G J, et al. Time-frequency analysis on torsional vibration of turbo-generator shafts [J]. Journal of Chinese Society of Power Engineering, 2011, 31 (9): 649–654, 671 (in Chinese).

    [8] ZHANG H Y, SHI W F. Simulation on 3-phase short circuit faults of ship power system [J]. Journal of Shanghai Maritime University, 2013, 34 (3): 43–47 (in Chinese).

    [9] CHEN Z Y. Propulsion shafting vibration of ship [M]. Shanghai: Shanghai Jiao Tong University Press, 1987 (in Chinese).

    [10] COOK R D, MALKUS D S, PLESHA M E, et al. Concepts and applications of finite element analysis [M]. 4th ed. New York: John Wiley & Sons, 2002: 407–411.

    [11] Vulkan GmbH & Co. KG. Torsional vibration calculation: Report No. 10_17_1.029 [R]. Herne, Germany: Vulkan GmbH & Co. KG, 2017.

This Article



Vol 15, No. 06, Pages 60-65

December 2020


Article Outline


  • 0 Introduction
  • 1 Calculation model and method
  • 2 Model parameters and calculation analysis
  • 3 Conclusions
  • References