Simulation study on the flow-induced vibration and noise in marine centrifugal pumps

Zhao, Cunsheng; Chai, Kai

doi:10.1177/10775463231180017

Cited by 3 publications

(1 citation statement)

References 15 publications

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“…The results showed that the misalignment of the rotor would cause severe vibration of the bearing in the pump. Zhao et al [20] calculated the influence of the gap between the volute and the impeller on the structural vibration of marine centrifugal pumps by acoustic analogy. Wang et al [21] used fluid-structure interaction and finite element methods to calculate the strength of the three-stage deep-sea mining mixed pump, and verified the safety and reliability of its structure.…”

Section: Introductionmentioning

confidence: 99%

Influence of Structural Parameters of Water-Lubricated Bearings on Vibration Characteristics of Marine Magnetic Pumps

Zhang,

Zhao,

Wang

2023

Water

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In order to study the influence of water-lubricated bearings on the vibration of the marine magnetic pump, the vibration characteristics of the marine magnetic pump under different flow rates and bearing structural parameters (bearing clearance, eccentricity, and length–diameter ratio) were numerically analyzed. The internal flow fields of marine magnetic pumps and water-lubricated bearing were numerically calculated, and experimental verification of their external characteristics results was conducted. The results show that the vibration velocity level of the pump increases with the increase in the bearing clearance and the bearing eccentricity, and the vibration velocity level of the pump gradually decreases with the increase in the bearing length–diameter ratio. The clearance has the greatest influence on the vibration of the pump, the length–diameter ratio the second, and the eccentricity the smallest. The peak value of vibration velocity at the pump outlet at the vibration measurement point is the highest, the peak value of vibration velocity at the pump inlet is second, and the peak value of vibration velocity at the pump foot is the smallest. However, the peak value of vibration velocity at the pump inlet is most sensitive to changes in operating conditions and bearing structural parameters, with a maximum increase of 6.2 dB. Therefore, the change in the peak value of vibration velocity at the pump inlet can be used as the main indicator for monitoring the operating status of bearings.

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Section: Introductionmentioning

confidence: 99%

Influence of Structural Parameters of Water-Lubricated Bearings on Vibration Characteristics of Marine Magnetic Pumps

Zhang,

Zhao,

Wang

2023

Water

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Underwater acoustic signal feature extraction of mixed flow pump based on empirical wavelet transform

Xu,

Cheng,

Jiao

et al. 2024

Physics of Fluids

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The pump converts mechanical energy into potential energy, and a mixed-flow-pump combines the characteristics of an axial flow pump and a centrifugal pump. When the mixed-flow-pump operates at low flow conditions, performance instability in the hump region appears on the performance curve. This study investigates the underwater acoustic signal in this area through experiments, computational fluid dynamics (CFD), and computational aero acoustics (CAA). The hysteresis factor calculated by cross correlation (CC) is utilized to improve the dynamic time warping (DTW) signal comparison verification method. The improved method (CC-DTW) improves the ability of DTW in signal comparison and verification. Compared with the fast Fourier transform (FFT) method, it is more convincing in the comparison of experimental and simulation pressure pulsation signals. After verifying the effectiveness of pressure pulsation signals and underwater acoustic signals, a combined empirical wavelet transform and FFT method is used to analyze underwater acoustic signal in instability regions. The results indicate that the depth of instability aligns with the FFT frequence ratio of the intrinsic mode function. Based on the feature, a criterion for determining instability states in mixed-flow-pumps is proposed.

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Application of rigid flexible coupling technology in vibration response analysis of washing machine

Sun,

2024

Vib. proced.

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The dynamic response of the box and suspension system is one of the most important factors affecting the vibration and noise of the washing machine. To ensure the accuracy of dynamic analysis, a rigid-flexible coupling model was put forward and established, enabling the acquisition of the load responses of flexible box and the dynamic characteristics of suspension system. The free vibrations of the washing machine box were analyzed, and the effective natural frequencies and modes were obtained. The modal neutral file was imported into ADAMS, where the rigid elements were replaced and spring and damping constraints were set. The dynamic responses of the center of mass displacement and load of the suspension system under different spring stiffness and damping system conditions were analyzed, which can provide important basis for optimizing the vibration isolation performance. The results show that the first-order natural frequency of the box exceeds the maximum excitation frequency, and the maximum stress is mainly distributed in the joints of the sheet metal.

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Simulation study on the flow-induced vibration and noise in marine centrifugal pumps

Cited by 3 publications

References 15 publications

Influence of Structural Parameters of Water-Lubricated Bearings on Vibration Characteristics of Marine Magnetic Pumps

Influence of Structural Parameters of Water-Lubricated Bearings on Vibration Characteristics of Marine Magnetic Pumps

Underwater acoustic signal feature extraction of mixed flow pump based on empirical wavelet transform

Application of rigid flexible coupling technology in vibration response analysis of washing machine

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