高速艇船体刚度小、激振力大且激振频率高，靠近主要激振源的尾部结构振动需要重点关注。本文针对某喷水推进高速艇，对其尾部区域甲板、船底板、泵舱壁和尾封板等局部结构采用规范经验公式对局部结构的板、板格固有频率进行计算，采用计及附连水质量的有限元模型对各尾部局部结构的板架固有频率进行计算，并将计算结果与轴频和叶频激励频率进行频率储备校核。对频率储备不满足要求的局部结构，建立包含喷水推进器流道结构的全船有限元模型，基于喷水推进器的激励力进行振动响应计算和校核评估，对采用喷水推进的高速艇的船体振动评估和船体设计具有参考意义。
High speed vessel is characterized by low rigidity and high frequency; attentions should be paid to the vibration of stern structure close to the main excitation source. Based on a water jet propulsion high speed vessel, this essay calculated the natural frequency of plate, panel and grillage of each local structure, such as deck, bottom, pump bulkhead and stern transom plate, with the methods of empirical formula estimation and finite element analysis considering the influence of added mass of entrained water. Comparing the results with shaft frequency and blade frequency, the frequency reserve check was carried out. For the structure with insufficient frequency reserve, the finite element model of the whole ship including the water jet propeller channel structure was established, and the vibration response was calculated and checked based on the excitation force of the water jet propeller, which has reference significance for the hull vibration evaluation and hull design of high speed vessel with water jet propulsion.
2022,44(8): 39-44 收稿日期：2021-09-03
DOI：10.3404/j.issn.1672-7649.2022.08.008
分类号：U663.2
作者简介：徐永超(1986-),男,硕士,工程师,研究方向为船舶与海洋工程结构设计
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