高速船尾部喷水推进局部振动分析

针对高速船尾部采用喷水推进装置的局部振动问题，建立了船体尾部包含喷水推进泵的有限元模型。考虑附连水质量的影响，将船体尾部离散成甲板，底板，喷水推进泵，尾板等局部结构，采用规范经验公式估算以及有限元分析的方法分别对各局部结构的板、板格、板架进行固有频率计算，将其结果与轴频和叶频激励频率进行储备频率校核，判断尾部采用喷水推进装置在振动问题上是否满足规范标准，并为下一步的船体设计提供参考。

Analysis of local vibration of water jet propulsion unit of high speed ship

To solve the problem of local vibration of water jet propulsion device of high speed ship, this paper builds the finite element model of stern contains water jet propulsion unit. Considering the influence of added mass of entrained water, dividing stern into deck, bottom, water jet propulsion unit, stern transom plate and other local structure, calculating natural frequencies of plate, panel and grillage of each local structures with the methods of specification empirical formula estimation and finite element analysis. Comparing the results with shaft frequency and blade frequency, checking the reserve frequency, judging whether water jet propulsion unit on vibration problem meets standards, providing reference for the following hull design.