Nonlinear dynamics of marine rotor-bearing system coupled with vibration isolation structure subject to ship rolling motion

Xie, Xu; Du, Xiaolei

doi:10.1016/j.apm.2021.10.049

Cited by 9 publications

(3 citation statements)

References 30 publications

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“…And there is an urgent need to optimize the parameters of floating raft isolation systems. In addition, the impacts of heaving motion, rolling motion on vibration of the system are studied by Xie et al, 39,40 respectively, yet the dynamic behaviours of the system subject to the heaving and rolling coupled motion need to be further explored. Hence, in this study, a dynamic model of the system is established after considering the implicated inertia force of ship motion, restoring force of the structure, unbalance inertia force of rotor and the nonlinear oil film reaction force; then, the effects of rotating speed, amplitudes and frequencies of the coupled motion on the system are detailed investigated.…”

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:

Self Cite

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“…The above studies show that the output performance of the PEMFC is affected by the general vibration environment, and its internal hydrogen consumption increases compared with normal conditions. However, the ship vibration environment is much more severe than the land vibration environment, and according to ISO 20283-5:2016, the maximum allowable vibration load of a ship reaches 214 mm/s, 14 which is much higher than the 4.6–144 m/s specified in IEC 61373:2011 for vehicle vibration; 15 therefore, accurately evaluating the PEMFC operation under the ship vibration environment is impossible through the literature. Simultaneously, most of the current research projects are conducted experimentally, but these methods cannot accurately measure the spatial distribution of hydrogen in the PEMFC to analyze the operation law of the PEMFC under vibration conditions.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Ship Vibration Effects on the Gas Distribution and Output Voltage of a Proton Exchange Membrane Fuel Cell

et al. 2022

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The effects of ship vibrations on the mass transfer and performance of proton exchange membrane fuel cells (PEMFCs) have many vague aspects. Hence, the method of loading ship vibrations with the sliding mesh is first proposed in this paper. Furthermore, this method is adopted to form the solution of the simulation study of PEMFC performance under ship vibrations. In the framework of computational fluid dynamics, the ship vibration is loaded into the three-dimensional PEMFC model and successfully solved. Then, a series of special cases are performed to explore the gas distribution and output features of PEMFCs in ship environments with different vibrations. Finally, the results show that the ship vibrations have vectorial effects on the gas transfer in the PEMFC. Additionally, vibrations perpendicular to the channel evidently affect the gas transfer. Moreover, while the vibrations are parallel to the channel, they remain nearly normal. Relatively, a more significant influence on the output voltage of the PEMFC will occur under smaller frequencies and/or greater amplitudes of ship vibrations.

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“…Excitation is another significant factor in gear transmission. Rotor systems with gear transmission under the working conditions of marine ships [14][15][16][17], wind turbines considering tower elasticity [18,19], vehicles traveling on the road [20], aeroengines considering stator [21,22] and so on belong to the typical rotor system under foundation excitation. Han and Chu [14,15] studied the dynamic response of the rotor-bearing-gear system with cracks under three periodic foundation angular motions of the ship.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Analysis and Fault Diagnosis for Gear Transmission of a Vibration Exciter of a Mine-Used Vibrating Screen under Different Conditions

Cheng

Cao

et al. 2022

Applied Sciences

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The helical gear pair of a box-type vibration exciter of a mine-used linear vibrating screen is subjected to complex excitation and prone to broken tooth failures. At present, investigation regarding the difference and particularity between gear transmission in vibrating screens (i.e., vibration machinery) and that in rotating machinery is still a challenge, which is the key to revealing the performance and failure mechanism of gear transmission in the premise of application to vibrating screens. In order to intuitively display the peculiarity of gear transmission on the exciter, an innovative virtual prototype model of a gear pair of a vibrating screen exciter is proposed. This model considers the effects of internal and external excitation, such as the friction and lubrication of the gear, strong alternating load produced by a large eccentric block, the reciprocating motion of the screen body, the large clearance of bearing and so on, and its correctness is verified. Based on the comparison, the inducement for the high fatigue rate of exciter gears is revealed. Models of a vibrating screen’s excitation system with different degrees of broken teeth are also established, and tooth fault features are proposed for fault detection. Sensitive indicators for the degradation degree of tooth damage are put forward, and the monitoring strategy is presented that with the increase of damage degree, the waveform index and pulse index of axial vibration acceleration increase. The analysis results provide powerful support for the optimal design of the vibrating screen’s exciter gears and fault diagnosis.

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Nonlinear dynamics of marine rotor-bearing system coupled with vibration isolation structure subject to ship rolling motion

Cited by 9 publications

References 30 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

Investigation of Ship Vibration Effects on the Gas Distribution and Output Voltage of a Proton Exchange Membrane Fuel Cell

Dynamic Analysis and Fault Diagnosis for Gear Transmission of a Vibration Exciter of a Mine-Used Vibrating Screen under Different Conditions

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