Study on Vibration Characteristics of Marine Centrifugal Pump Unit Excited by Different Excitation Sources

Dai, Caili; Zhang, Yuhang; Pan, Qi; Li, Dong; Liu, Houlin

doi:10.3390/jmse9030274

Cited by 15 publications

(10 citation statements)

References 7 publications

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“…This may be because the interaction coupling of the internal flow excitation and the structure of the pump results in the OAVL of the pump at 1.0 Q d being the smallest. 55 At different flow rates, the OAVL at M4 is less than that at M3 but larger than that at M5, and the total VL at M2 is the lowest. In addition, the OAVL error of M2-M5 is the largest under small flow rate, and it is the smallest at 1.0 Q d .…”

Section: Resultsmentioning

confidence: 87%

Influence of shaft combined misalignment on vibration and noise characteristics in a marine centrifugal pump

Wang

Liu

et al. 2022

Journal of Low Frequency Noise, Vibration and Active Control

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Shaft combined misalignment is the main form of shaft misalignment fault in a marine centrifugal pump. To investigate the influence of shaft misalignment on the vibration and noise of marine centrifugal pumps, a marine pump is experimentally measured under normal condition and shaft combined misalignment condition. In this paper, the frequency domain characteristics of vibration and noise are analyzed by Fast Fourier transform technique. The characteristics of axis orbit, the spectral characteristics of vibration and noise, and the One-Third octave spectral distribution characteristics are also comprehensively compared. Results show that after shaft combined misalignment occurs, the maximum amplitudes of 1APF (axial passing frequency) in the X and Y directions at M1 increase by 35.06% and 24.04%, the maximum amplitudes of 2APF in the X and Y directions at M1 increase by 2.61 times and 2.61 times, and the axis orbit shows a clockwise variation of the “8” shape. As the flow rate decreases, the shape of an “8” of the rotor axis orbit becomes progressively flatter. The maximum Overall vibration velocity level (OAVL) of M2 and M5 decreases by 12.03% and 1.79%, and the maximum OAVL of M3 and M4 increases by 6.52% and 2.27%. The frequency domain amplitude of M6 increases significantly in 1APF and 2APF, and the maximum increases are 12.41% and 2.24% at different flow rates. The overall sound pressure level of M6 increases by 0.42% at 0.6 Qd. These findings indicate the vibration energy of M1-M5 and noise energy of M6 are related to the running condition. The axis orbit of M1 shows the shape of 8, which can significantly judge the misalignment of the shafting. Then, combined with the amplitude variation of 1APF and 2APF of the M2-M6 spectrum, the comprehensive misalignment of shafting can be further judged. The above discoveries provide reference to the diagnosis of shaft combined misalignment fault that occurred for the marine pump.

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Section: Resultsmentioning

confidence: 87%

Influence of shaft combined misalignment on vibration and noise characteristics in a marine centrifugal pump

Wang

Liu

et al. 2022

Journal of Low Frequency Noise, Vibration and Active Control

Self Cite

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“…For a sound source with simple harmonic vibration, the sound pressure level can satisfy the sound wave equation, namely, the Helmholtz equation. The specific equation is shown in Equation (9).…”

Section: Turbulence Kinetic Energymentioning

confidence: 99%

The influence of blade curvature radius on the internal unsteady characteristics of a centrifugal pump

Wang,

Liu,

Cao

2024

Energy Science & Engineering

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To study the influence of the blade curvature radius on the flow‐induced vibration and noise of the centrifugal pump, the internal sound field of the IS 80‐65‐160 centrifugal pump was numerically calculated by adjusting the blade wrap angles to change the blade curvature radius. The RNG (Reynolds Time Average Simulation) turbulence model was selected for the numerical calculation of the centrifugal pump. The numerical simulation of the whole flow channel of the centrifugal pump was carried out using Ansys Fluent software, and the external characteristic curve of the centrifugal pump was obtained. The influence of different blade wrap angles on the internal pressure, velocity and Turbulent Kinetic Energy of the centrifugal pump was obtained. On the basis of the sound–structure coupling equation, the unsteady sound field of the centrifugal pump was calculated, and the time domain and frequency domain characteristics of the pressure pulsation at each monitoring point were obtained. The calculation results showed that the dynamic and static interference between the impeller and the volute tongue mainly caused the vibration of the centrifugal pump. By appropriately increasing the blade wrap angles, the pressure pulsation in the volute fluid domain could be effectively reduced. The vibration and noise test bench of the centrifugal pump was set up to verify the test. The experimental results showed that at the double‐blade frequency, the variation trend of the experimental value and the simulated value of the outflow flow‐induced noise of the centrifugal pump were consistent, which verified the accuracy of the sound field simulation calculation. When the blade wrap angle , it could effectively reduce the internal sound pressure level and the flow‐induced vibration and noise of the centrifugal pump. By adopting measures such as grid encryption at the position of the tongue, nonstationary calculation and comparison of different turbulence models, the accuracy of the calculation results of the internal flow field and sound field of the centrifugal pump is effectively improved, and the accuracy and reliability of the experimental results are ensured. The above research results had certain reference significance and application value for improving the working efficiency of centrifugal pumps and reducing flow‐induced vibration and noise.

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“…This can also affect the stealth performance of the ship. Therefore, it is of great importance to propose a muffler for vibration and noise reduction in the pumping system [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Structural Optimization of a Muffler for a Marine Pumping System Based on Numerical Calculation

Liu

Lin

Hua

et al. 2022

JMSE

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In order to eliminate the noise in the pumping system and prolong the service life of the equipment, an optimization design method for a muffler structure is proposed. The inside of the muffler is designed with a water guide cone which plays the role of diverting the fluid in the pipeline. The muffler shell, the wall surface of the water guide cone, and the circular bottom plate adopt a porous structure. In order to achieve the best sound suppression effect of the muffler structure, the effects of different channel expansion angles and the flow area on the performance of muffler are studied the results show that when the flow channel expansion angle of the muffler is 145° and the flow area ratio is 3 times, the noise elimination performance of the muffler is the best. The structural optimization of the muffler studied in this paper is of great significance to noise reduction in the pumping system.

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Study on Vibration Characteristics of Marine Centrifugal Pump Unit Excited by Different Excitation Sources

Cited by 15 publications

References 7 publications

Influence of shaft combined misalignment on vibration and noise characteristics in a marine centrifugal pump

Influence of shaft combined misalignment on vibration and noise characteristics in a marine centrifugal pump

The influence of blade curvature radius on the internal unsteady characteristics of a centrifugal pump

Structural Optimization of a Muffler for a Marine Pumping System Based on Numerical Calculation

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