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首页> 外文期刊>Journal of the Chinese Society of Mechanical Engineers, Series C: Transactions of the Chinese Society of Mechanical Engineers >Predictions of ship structural vibration transmission and radiated underwater sound power at medium frequency ranges
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Predictions of ship structural vibration transmission and radiated underwater sound power at medium frequency ranges

机译：中频范围内船舶结构振动传递和水下辐射声功率的预测

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摘要

In this paper the Statistical Energy Analysis(SEA) Method and Finite Element Method was used to estimate the amount of vibrational energy generated by the main engine on board ship that is transmitted to the nearby structures and the surrounding water. Finite element method was used to estimate the coupling loss factor between subsystems for use in the SEA model to predict the structural response. The purpose of combining these two methods is to avoid the restriction in using SEA, that is, it can only he used when the modal density is high, i.e., in higher frequency ranges, whereas the combined model applies to medium frequency ranges. A model of an engine room section was built to conduct experiments on vibrational energy transmission into adjacent structures and water. Finally, the results from the experiments and theoretical predictions were compared to check the validity of the proposed theory.
机译：在本文中，使用统计能量分析（SEA）方法和有限元方法来估计主机上的主机所产生的振动能量，该振动能量会传递到附近的建筑物和周围的水中。 SEA模型中使用有限元方法估算子系统之间的耦合损耗因子，以预测结构响应。结合这两种方法的目的是避免使用SEA的限制，即只能在模态密度较高时（即在较高频率范围内）使用SEA，而组合模型适用于中频范围。建立了机舱部分的模型，以进行振动能量传递到相邻结构和水中的实验。最后，将实验结果和理论预测结果进行了比较，以验证所提出理论的有效性。

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