Numerical study on transient response characteristics of natural circulation in coupled loops under ocean condition

Li, Yong; He, Chuan; Jinrong, Qiu; Tan, Sichao; Hou, Xiaofan; Li, Longze; Xiao, Qi

doi:10.1016/j.pnucene.2020.103248

Cited by 7 publications

(2 citation statements)

References 12 publications

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“…According to literatures 5,26,[30][31][32] , the heaving displacement has the form x H = a max sin (ω H t), where a max is the maximum heaving amplitude and ω H is the heaving frequency; furthermore, the rolling angle can be represented as θ R = θ max sin (ω R t), where θ max is the maximum rolling amplitude, ω R is the rolling frequency. Therefore, the coupled motion of heaving and rolling of ship in the presence of different sea waves can be simulated by changing the above parameters.…”

Section: Basic Descriptionmentioning

confidence: 99%

“…However, for a rotor-bearing system on the moving hull, it is very necessary to consider the impact of implicated movements. Heaving and rolling are common forms of motion when a ship is sailing, and these two forms of motion often couple when they have similar frequencies [5][6][7][8] . Under the coupled motion, the rotor will be affected by the implicated inertia force of the coupled motion, oil film reaction force of the journal bearing and unbalanced inertia force of itself, and its vibration characteristics will change greatly.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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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