Minimisation of the sound power radiated by a submarine through optimisation of its resonance changer

Merz, Sascha; Kessissoglou, Nicole; Kinns, Roger; Marburg, Steffen

doi:10.1016/j.jsv.2009.10.019

Cited by 55 publications

(17 citation statements)

References 10 publications

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“…26,28 Previous convergence studies showed the necessity of numerous frequency steps for an accurate representation of energy content within the frequency domain. 17 As the integral of the power over frequency is indefinite, there is no solution for an infinite frequency domain.…”

Section: Analytical Description Of the Sound Power Frequency Charactementioning

confidence: 99%

Characteristic amplitude-frequency functions of the radiated sound power

Klaerner¹,

Wuehrl²,

Kroll³

et al. 2017

Proceedings of Meetings on Acoustics

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Section: Analytical Description Of the Sound Power Frequency Charactementioning

confidence: 99%

Characteristic amplitude-frequency functions of the radiated sound power

Klaerner¹,

Wuehrl²,

Kroll³

et al. 2017

Proceedings of Meetings on Acoustics

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“…Dylejko et al and Dylejko 19,20 established a bar model for the shafting system and a cabin hull model to study the admittance results under the action of the thrust bearing. Merz et al [21][22][23] established a coupled model of the propeller-shaft system and a submarine hull. He found the low-frequency vibrational modes of the hull and the propeller-shaft system may result in a high level of radiated noise.…”

Section: Introductionmentioning

confidence: 99%

Coupled vibration characteristics of a submarine propeller-shaft-hull system at low frequency

Chen

2019

Journal of Low Frequency Noise, Vibration and Active Control

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The coupled longitudinal and transverse vibration characteristics of a submarine propeller-shaft-hull system at low frequency are studied in this paper. Two substructures, which are the propeller-shaft subsystem and the submarine hull, are first modelled using the finite element method. The two substructures are then connected through bearings, which are simplified as longitudinal and lateral springs and dampers. The modes, the natural frequencies and the coupled vibration characteristics of the two substructures and their synthesized system are simulated. An experiment studying the dynamic characteristics of a large-scale submarine test-rig is proceeded and compared with the numerical results, showing great consistency. Finally, transfer path analysis of the low frequency excitation forces using power flow method is discussed.

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“…However, there was no way to regulate the frequencies of the system based on the radial bearings purposefully. Kessissoglou N. [14][15][16] researched on the application of resonance changer in the vibration and noise reduction. Resonance changer in the low frequency stage could play a very good role in the suppression of acoustic radiation, but at high frequency, it is still very limited.…”

Section: Introductionmentioning

confidence: 99%

Effect of misaligned bearing support performance on natural frequencies of marine propulsion shafting

Zhang¹,

Gu²

2017

J. vibroeng.

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The influences of bearing support performance which would be affected by the quality of shafting alignment apparently on the lateral vibration natural frequencies of marine propulsion shafting are analyzed in this paper. A three dimensional finite element model representing the entire propulsion shafting, including the bearings, shaft and propeller, has been developed using finite element software for lateral vibration analyses. The effects of the number of bearings, the stiffness and effective contact length of the bearings on the natural frequencies of the shaft are studied respectively. The simulation analysis show that the bearing of a certain position often only has a significant impact on the frequencies of a certain order or a few orders, and the natural frequencies of the shaft can be transferred to avoid the resonance speeds through the reasonable arrangement and performance design of the shaft bearings. In addition, the curve alignment technology is also presented to improve the current shafting alignment quality and misalignment angle error, so as to ensure the design performance of radial bearings. Experimental results show that the curve alignment technology is an effective method to reduce the uneven load and eccentric wear of the bearings, which are beneficial to avoid the resonance vibration and improve the life and stability of shaft system.

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Minimisation of the sound power radiated by a submarine through optimisation of its resonance changer

Cited by 55 publications

References 10 publications

Characteristic amplitude-frequency functions of the radiated sound power

Characteristic amplitude-frequency functions of the radiated sound power

Coupled vibration characteristics of a submarine propeller-shaft-hull system at low frequency

Effect of misaligned bearing support performance on natural frequencies of marine propulsion shafting

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