Numerical investigation of dynamic and hydrodynamic characteristics of the pad  in the fluid pivot journal bearing

Nguyen, Tuyen Vu; Li, Weiguang

doi:10.1177/13506501211033045

Cited by 4 publications

(5 citation statements)

References 28 publications

(29 reference statements)

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“…The numerical simulation conditions are difficult to be completely consistent with the actual situation, and the difference between the physical model and the numerical model is also small. In addition, considering that the heave motion response is not very large, the error is not large, while the pitch motion response is more obvious, so the error is slightly larger, and the combination of polyethylene rope and spring in the test may be the reason for the error in the cable tension [17] -18 ] .…”

Section: Figure 3 Vertical Shakementioning

confidence: 99%

Hydrodynamic Characteristics of Ocean Engineering Numerical Pool Benchmark Model Relying on Numerical Simulation

2022

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The development of water resources and energy is increasing day by day, including the exploration and development of marine resources and natural gas. Over the past 30 years of reform and opening up, my country's economic development has made remarkable achievements, high-tech enterprises and power plants have also developed rapidly, and the demand for electricity and resources is also increasing. The purpose of this paper is to study the hydrodynamic characteristics of the numerical pool benchmark model for marine engineering relying on numerical simulation. This paper develops a numerical model for a design reference test case of a semi-submersible platform and predicts the hydrodynamic properties under three typical operating conditions, namely survival and pumping, space acceleration operation, etc. Comparing the dynamic response calculation results with the existing sixth-generation response numerical simulation results, the trend is consistent, which proves that the model is as reasonable and advanced as the reference model. In this paper, the comparative results of numerical simulations are analyzed. The motion performance of the platform and its motion system under different conditions, such as changing the height of the center of gravity, changing the composition of the mooring line, changing the initial pre-tightening angle of the line mooring, and breaking the line under its influence are studied. The results of the difference law of displacement and motion between the platform and the mooring system provide a specific reference for the optimal design of the platform. Experiments show that the maximum relative errors of mooring line tension, heave motion and pitch motion are 13.9%, 7.69% and 11.6%, respectively. From the above calculation results, it can be seen that there is a certain error between the experimental value and the numerical calculation value .

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Section: Figure 3 Vertical Shakementioning

confidence: 99%

Hydrodynamic Characteristics of Ocean Engineering Numerical Pool Benchmark Model Relying on Numerical Simulation

2022

FOE

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“…The geometry of the FPJB and the coordinate system is shown in Figure 1. Reynolds equation governing the steady, laminar incompressible flows is given as follows 7 :…”

Section: Numerical Model and Floating Conditions Of The Padsmentioning

confidence: 99%

“…- The flow equilibrium 7 : The flow from the hydrodynamic area through the orifice to hydrostatic Q in and the flow out of the recess Q o , Q in = Q o . Where U is the projection of shaft circumference velocity on the outer normal direction around the pressure orifice, h d is hydrodynamic oil film thickness, h s is hydrostatic oil film thickness, p d is hydrodynamic film pressure, p s is hydrostatic film pressure, μ is lubricant dynamic viscosity, n x and n y are unit normal direction, x and z are the axial directions, ϕ re is position angle of recess end edge, ϕ rs is position angle of recess start edge.…”

Section: Numerical Model and Floating Conditions Of The Padsmentioning

confidence: 99%

“…- The torque equilibrium 7 : The torques that tilt the pad created by the hydrodynamic pressure M de and the hydrostatic pressure M se , M de = M se . Where l is recess length in axial λ direction.…”

Section: Numerical Model and Floating Conditions Of The Padsmentioning

confidence: 99%

“…In 2021 Yang et al 6 studied the floating characteristics of pads at the initial working phase. Nguyen Tuyen Vu 7 used numerical methods to investigate the influence of structural parameters on pendulum angle, lubricant oil flow through the orifice, and recess pressure in FPJB.…”

Section: Introductionsmentioning

confidence: 99%

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Improving the floating efficiency for the pads in fluid pivot journal bearing

Nguyen

Phan

2022

Proceedings of the Institution of Mechanical Engineers, Part J:

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Previous studies have shown that during the operation of a fluid pivot journal bearing (FPJB), almost only the bottom pad floats. The other two pads are not able to float, resulting in no squeeze film damper (SFD) formed in their places. Therefore, the bearing has not yet reached its full advantage. From this situation, the work focuses on studying how to improve the floating efficiency of the pads in FPJB. Based on a thorough study of the hydrodynamic pressure distribution on the pads and related issues, the orifices are placed in the appropriate position to increase the pressure in the recess. According to this proposed method, all three pads reach the floating state during the stable working of the bearing. The numerical model of FPJB in previous studies is applied to evaluate the effectiveness of the proposed solution. The effect of orifice positions on the buoyancy of the pads was then also thoroughly investigated, and results are then provided and discussed. In the case that orifices are in the middle of the pads, only the bottom pad satisfies floating conditions and the other two pads are almost not able to float. The floating effect of the pad increases when the orifice is moved closer to the top of the hydrodynamic pressure. After the orifice's position is adjusted, the recess pressure increases significantly so that the hydrostatic torque increases while the hydrodynamic torque remains unchanged. As a result, all three pads satisfy the floating conditions. The SFD is not only formed, but also reaches a large value, and therefore, the damping will be greatly increased. Then the calculation results are verified based on a comparison with the data in the previous studies.

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Effect of Structural Parameters on Dynamic Characteristic of Fluid Pivot Journal Bearing

Nguyen

Phan

2022

J. Inst. Eng. India Ser. C

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Numerical investigation of dynamic and hydrodynamic characteristics of the pad in the fluid pivot journal bearing

Cited by 4 publications

References 28 publications

Hydrodynamic Characteristics of Ocean Engineering Numerical Pool Benchmark Model Relying on Numerical Simulation

Hydrodynamic Characteristics of Ocean Engineering Numerical Pool Benchmark Model Relying on Numerical Simulation

Improving the floating efficiency for the pads in fluid pivot journal bearing

Effect of Structural Parameters on Dynamic Characteristic of Fluid Pivot Journal Bearing

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