Theoretical Analysis of the Coupled Torsional-Axial Forced Vibration of the Marine Diesel Engine Shafting

Jeon, Hiojung

doi:10.5988/jime1966.5.217

Cited by 2 publications

(1 citation statement)

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“…That is the law of motion and dynamical interaction of the coupled torsional-longitudinal vibrations of the rotational shaft. References [20][21][22] have demonstrated the accuracy of the theoretical analysis for a marine propulsion shaft.…”

Section: Theoretical Basismentioning

confidence: 99%

Investigation of Lumped-Mass Method on Coupled Torsional-longitudinal Vibrations for a Marine Propulsion Shaft with Impact Factors

Huang

Liu

Cao

2019

JMSE

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Severe vibrations of the marine propulsion shaft can evidently affect the dynamical response of the propulsion system and degrade the performance of a ship. As the vibration forms couples which interact with each other, a better understanding of the coupled vibrations is essential for dynamic prediction to improve the efficiency and reliability of the marine propulsion system. Thus, an investigation of the lumped-mass method for coupled torsional-longitudinal vibrations of the shaft is proposed. First, a theoretical solution for the coupled ordinary differential equations demonstrates the accuracy of the proposed lumped-mass model. This model allows for the bifurcation diagram and the Poincare surface, and transient accelerations of the coupled vibrations are numerically calculated. Furthermore, the impact factors including various length-diameter ratios, coupling stiffness coefficients, and damping coefficients are respectively discussed. These impact factors are found to affect the coupled vibrations to different extents through the comparison of the transient accelerations. Finally, an accurate and applicative lumped-mass method for the coupled torsional-longitudinal vibrations of the marine propulsion shaft has been obtained. An optimal design and vibration reduction of the shaft, considering the above-mentioned impact factors, can be achieved.

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Section: Theoretical Basismentioning

confidence: 99%