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| Prediction of underwater vehicle vibration-noise based on singularity-decomposition and self-adaptive BEM quadrature |
| Received:March 31, 2010 Revised:October 12, 2010 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20116008 |
| KeyWord:mechanical noise modified-BEM singularity-decomposition self-adaptive BEM quadrature |
| Author | Institution |
| 魏应三 |
海军工程大学 船舶与动力学院, 武汉 |
| 王永生 |
海军工程大学 船舶与动力学院, 武汉 |
| 聂沛军 |
海军工程大学 船舶与动力学院, 武汉 |
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| Abstract: |
| A modified boundary element method(M-BEM) was proposed to calculate the engine vibration induced underwater near-field noise of a submerged structure.A singularity-decomposition scheme and a self-adaptive BEM quadrature algorithm were adopted to overcome Helmholtz hyper-singular and singular integral when calculating near-field sound pressure.A numerical case of a pulsating sphere was investigated to validate the M-BEM algorithm.Then M-BEM coupled with FEM were applied to predict underwater vehicle vibration-noise considering fluid-structure interaction effects.By visualization the near-field sound pressure distribution,high sound pressure area was localized.Finally,the underwater radiated sound power was calculated and the peak frequencies were identified.Reduction of the engine periodic-isolator's stiffness can effectively transfer the sound power of peak frequencies to band-spectrum and the vibration noise of the line spectrum is controlled. |