Alignment and safety analysis of marine propulsion shafting using intelligent floating raft system

Zhang, Yuanchao; Xu, Wei; Li, Zhengmin; Yin, Lihang

doi:10.1007/s00773-020-00738-1

Cited by 14 publications

(9 citation statements)

References 11 publications

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“…Xu et al 37 analysed the nonlinear dynamics of a rotor system with a dynamic vibration absorber. Zhang et al 38 designed an intelligent floating raft system (IFRS) for marine propulsion shafting; they also analysed the mechanical vibration characteristics of the system.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear dynamics of the rotor system with a floating raft isolation structure under the coupled motion of ship heaving and rolling

Xie

Wang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part K:

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A floating raft isolation structure is adopted to reduce the vibration of the marine rotor-bearing system, however, the system on the moving hull will be affected by the ship implicate motion, and its vibration will be difficult to predict. In this study, a dynamic model of the system under heaving and rolling coupled motion is established after considering the nonlinear oil film reaction force, unbalance inertia force, restoring force of the structure and inertia force of the ship motion. A numerical method is introduced to present the responses of the system, such as the amplitude and rotating speed curve, waterfall diagrams, and the rotor orbit and its Poincaré maps, etc. Moreover, the effects of rotating speed, amplitudes and frequencies of the coupled motion on the dynamic behaviours of the system are studied. The results indicate that the unstable region of rotating speed of the system increases under the coupled motion, the vibration of the system is greatly affected by the parameters of coupled motion, and the vibration amplitudes of rotor and raft can be effectively limited due to the displacement restrictor.

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Section: Introductionmentioning

confidence: 99%

Nonlinear dynamics of the rotor system with a floating raft isolation structure under the coupled motion of ship heaving and rolling

Xie

Wang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part K:

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“…Also, more unexpected potential factors affecting the VIE performance will be brought about, such as more modal frequency of the floating raft itself and more excitation available, and more components likely to be affected adversely with more complex equipment and machines to be isolated. 15,16 However, constrained by the overall space, general layout, and center of gravity of the ship, the development trend of the two-stage mounting system is to be light in weight while maintaining efficient vibration isolation performance. Therefore, studying lightweight mounting systems is of great significance and urgency.…”

Section: Introductionmentioning

confidence: 99%

Model-based design of a novel modular mounting system: Light, compact, and efficient

Qiu

et al. 2022

Advances in Mechanical Engineering

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Two-stage mounting systems applied in ships are expected to be light in weight, compact in installation space, and efficient in vibration isolation performance at the same time, which largely increases the engineering complexity. In this paper, analytical models of a two-stage mounting system with flexible and rigid intermediate mass are proposed to compare the vibration isolation effectiveness (VIE) performance and the influences of system parameters with the rigid intermediate mass on VIE are introduced. Based on the analysis results, an integrated adjustable two-stage mounting module is designed. Compared to the traditional floating raft mounting system with flexible intermediate mass, this two-stage mounting module can be arranged in a more compact structure space with greatly reduced size and weight. Furthermore, a novel modular mounting system prototype is proposed and manufactured based on several two-stage mounting modules and real-time behavior monitoring and controlling subsystem. The testing results verify the compatibility of the module design and the behavior monitoring and controlling system. The modular mounting system also exhibits excellent VIE performance combined with the advantage of compact intermediate mass size, lightweight, and automatic behavior monitoring and controlling.

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“…He et al (2014) established the monitoring model of alignment between marine propulsion unit and propulsion shafting, followed by the alignment and converge rule which assure the fast and uniform convergence of both air spring's load distribution and alignment control process. Zhang et al (2020Zhang et al ( ,2021 introduced an intelligent floating raft system for marine propulsion shafting which monitors the attitude of the shafting in real time through the displacement sensor and calculated the alignment attitude of the shafting to realize the alignment state control of the main engine and the shafting.…”

Section: Introductionmentioning

confidence: 99%

Raft attitude control and elastic deformation suppression technique for large-scale floating raft air spring mounting system

Qiu

et al. 2021

Journal of Vibration and Control

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The structure of floating rafts-equipped vessels will be inevitably undermined due to application of large-scale designs. When encountering strong external disturbances, not only the rafts will deviate from the original balanced position but also greater elastic deformation will be generated, which may lead to the relative displacement between devices on rafts and endanger the operation safety of equipment. In this study, a class of raft elastic deformation monitoring and discrimination methods is put forward via analyzing the features of large-scale raft elastic deformation. Air springs layout is optimized through finite element method (FEM). A flexible raft control responding model is established and a novel raft elastic deformation suppression technique is proposed based on air spring pressure parameter identification that adjusts the air spring pressure distribution. The experimental results indicate that this technique can effectively control the attitude of the rafts and reduce elastic deformation, leading to a largely improved control precision and a faster convergence speed of the raft.

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Alignment and safety analysis of marine propulsion shafting using intelligent floating raft system

Cited by 14 publications

References 11 publications

Nonlinear dynamics of the rotor system with a floating raft isolation structure under the coupled motion of ship heaving and rolling

Nonlinear dynamics of the rotor system with a floating raft isolation structure under the coupled motion of ship heaving and rolling

Model-based design of a novel modular mounting system: Light, compact, and efficient

Raft attitude control and elastic deformation suppression technique for large-scale floating raft air spring mounting system

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