Vibro-acoustic characteristics of a coupled pump-jet – Shafting system – SUBOFF model under distributed unsteady hydrodynamics by a pump-jet

Su, Zhen; Shi, Shuaikang; Huang, Xiuchang; Rao, Zhiqiang; Hu, Hua

doi:10.1016/j.oceaneng.2021.109429

Cited by 19 publications

(3 citation statements)

References 28 publications

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“…It can provide a reference for the low-noise design of submarine structures. For the concerned pump-jet, Su et al (2021) simulated the unsteady excitation forces of pump-jet by computational fluid dynamics (CFD) and highlighted the contributions of different excitation forces to sound radiation by finite element model (FEM) and boundary element model (BEM). It is shown that the contribution of the distributed forces on rotors is dominant.…”

Section: Introductionmentioning

confidence: 99%

Vibro-acoustic characteristics of a submarine model excited by excitation forces of pump-jet duct

Zhang

2023

Journal of Vibration and Control

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The vibro-acoustic responses of coupled pump-jet-submarine systems excited by fluid excitations on the wall of the duct are numerically investigated. The unsteady excitations are calculated by computational fluid dynamics and the vibration responses for different excitations on the inner and outer walls are contrastively analyzed through establishing a finite element model of the coupled system. Meanwhile, the effect of fluid–structure interaction and the excitation loading methods for the inner flow of duct are considered. The sound radiation characteristics for different excitation sources are predicted through using a boundary element model. The results show that the excitation force spectra of the inner wall have a remarkable discrete peak at blade passing frequency and its multiple, while the excitation force spectra of the outer wall show a broadband characteristic and discrete components appear at blade passing frequency. The modes of hull both dominate the vibro-acoustic responses of the coupled system for different excitation sources of the duct. The transmitted energy for inner excitation forces is significantly greater than that of outer excitation forces, but the sound radiation efficiency is relatively close. The excitations of the duct can transfer to the thrust bearing through stators as well as the hull and cause a coupled vibration between the duct–stator–hull and the shafting system. Besides, the method for applying distributed forces on the inner wall is more reliable.

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Section: Introductionmentioning

confidence: 99%

Vibro-acoustic characteristics of a submarine model excited by excitation forces of pump-jet duct

Zhang

2023

Journal of Vibration and Control

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“…Pang et al takes a certain axial piston pump as an example, compares the vibration acceleration and noise when water and oil are used as working media, and studies the in uence of the working media on the noise and vibration of the pump [1]. By applying distributed or equivalent pulse force to di erent areas of the pump jet, Su et al thinks that the response of concentrated force applied to the whole pump-jet ow eld mode and excitation characteristics has a more reasonable magnitude, which shows the importance of concentrated force instead of concentrated force [2]. Li developed the pump shaft design program in the APDL language and displayed the stress distribution and the position of a dangerous section of the pump shaft under an external load through the three-dimensional model, thus completing the design of pump shaft strength [3].…”

Section: Introductionmentioning

confidence: 99%

Study on Optimization of Pump Shaft Transmission System of Plastic Centrifugal Pump

Zhang

Tang

Wen

et al. 2022

Journal of Engineering

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At present, the design of the pump shaft transmission system mostly refers to the design method of the metal pump transmission system. The dynamic and static characteristics of the plastic centrifugal pump are not related to the structural parameters of the pump shaft. Aiming at the influence of the structural parameters of the pump shaft transmission system on the dynamic and static performance of the plastic centrifugal pump, the three-dimensional model of the impeller and volute chamber was drawn by Creo5.0. The CFD calculation of the load of the plastic centrifugal pump was carried out. The flow field of the plastic centrifugal pump under ideal working conditions was simulated by ANSYS FLUENT. Combined with the application principle of singular function in mechanics, the mathematical model of a deflection of the pump shaft transmission system was constructed. Considering the minimum deflection and the maximum critical speed of the first order as the objective function, an optimization model of the structural parameters of the pump transmission system was established. The NSGA-II multiobjective optimization method was used to solve the optimal structural parameters of the optimization model, and the optimization design of the pump shaft span, cantilever, front, and rear bearing clearance was completed. The optimal span cantilever ratio of the rotor model of the single span cantilever structure was 1:0.75. Compared with the traditional design model, the optimized pump shaft deflection is reduced by 52.35%, and the first-order critical speed is increased by 42.77%. Simultaneously, using polynomial fitting as a mathematical tool, the experimental data were analyzed, and the mathematical expression of the rotation speed deflection relationship of the pump shaft at the first critical rotation speed and the corresponding function curve was obtained.

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“…Sun et al [15] investigated the feasibility of using a serrated trailing edge duct in a PJP for noise reduction. Su et al [25] concluded that the force fluctuation of the rotor dominates the vibro-acoustics response caused by PJP.…”

Section: Introductionmentioning

confidence: 99%

Effects of Blade Number on the Propulsion and Vortical Structures of Pre-Swirl Stator Pump-Jet Propulsors

Han

Huang

Pan

et al. 2021

JMSE

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Reducing the noise of the underwater propulsor is gaining more and more attention in the marine industry. The pump-jet propulsor (PJP) is an extraordinary innovation in marine propulsion applications. This paper inspects the effects of blade number on a pre-swirl stator pump-jet propulsor (PJP) quantitatively and qualitatively. The numerical calculations are conducted by IDDES and ELES, where the ELES is only adopted to capture the vortical structures after refining the mesh. The numerical results show good agreement with the experiment. Detailed discussions of the propulsion, the features of thrust fluctuation in time and frequency domains, and the flow field are involved. Based on the ELES results, the vortices in the PJP flow field and the interactions between the vortices of the stator, rotor, and duct are presented. Results suggest that, though changing the blade number under a constant solidity does not affect the propulsion, it has considerable effects on the thrust fluctuation of PJP. The wakes of the stator and rotor are also notably changed. Increasing the stator blade numbers has significantly weakened the high-intensity vortices in the stator wake and, hence, the interaction with the rotor wake vortices. The hub vortices highly depend upon the wake vortices of the rotor. The hub vortices are considerably broken by upstream wake vortices when the load per rotor blade is high. In summary, the blade number is also vital for the further PJP design, particularly when the main concerns are exciting force and noise performance.

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Vibro-acoustic characteristics of a coupled pump-jet – Shafting system – SUBOFF model under distributed unsteady hydrodynamics by a pump-jet

Cited by 19 publications

References 28 publications

Vibro-acoustic characteristics of a submarine model excited by excitation forces of pump-jet duct

Vibro-acoustic characteristics of a submarine model excited by excitation forces of pump-jet duct

Study on Optimization of Pump Shaft Transmission System of Plastic Centrifugal Pump

Effects of Blade Number on the Propulsion and Vortical Structures of Pre-Swirl Stator Pump-Jet Propulsors

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