﻿ 喷水推进高速艇尾部振动响应分析
 舰船科学技术  2022, Vol. 44 Issue (8): 39-44    DOI: 10.3404/j.issn.1672-7649.2022.08.008 PDF

1. 中国船舶及海洋工程设计研究院，上海 200011;
2. 沪东中华造船(集团)有限公司，上海 200219

Analysis of stern vibration response of water jet propulsion high speed vessel
XU Yong-chao1, FU He-qi1, TAO Guo-jun2
1. Marine Design and Research Institute of China, Shanghai 200011, China;
2. Hudong-Zhonghua Shipbuilding (Group) Co. Ltd., Shanghai 200219, China)
Abstract: 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.
Key words: high speed vessel     water jet propulsion     local vibration     frequency reserves     vibration response
0 引　言

1 高速艇局部振动衡准分析 1.1 固有频率储备衡准

1.2 振动响应衡准

《舰艇船体振动评价基准 快艇》提出了基于螺旋桨激振等稳态激励的船体振动评价基准[13]，其适用于水线长50 m以下的金属结构快艇，对垂直方向的振动单峰值进行评价，评估的振动频率范围为10～200 Hz。

 图 1 快艇船体振动评价基准 Fig. 1 Guidelines for the evaluation of vibration on high speed vessel
2 尾部局部结构振动分析 2.1 有限元模型

 图 2 高速艇尾部局部结构有限元模型 Fig. 2 Finite element model of stern structure of high speed vessel
2.2 尾部局部结构固有频率计算及频率储备校核

 图 3 船底板架1阶振型图 Fig. 3 1st order vibration mode of bottom grillage

 图 4 尾封板板架1阶振型图 Fig. 4 1st order vibration mode of stern transom plate grillage

 图 5 泵舱壁板架1阶振型图 Fig. 5 1st order vibration mode of pump bulkhead grillage

 图 6 甲板板架1阶振型图 Fig. 6 1st order vibration mode of deck grillage

2.3 尾部局部结构振动响应计算分析

1）激振力分析

2）激振力大小及施加

 图 7 激振力施加示意图 Fig. 7 Schematic diagram of applying excitation force

3）振动响应计算分析

 图 8 速度响应曲线 Fig. 8 Velocity response curve

 图 9 加速度响应曲线 Fig. 9 Acceleration response curve

3 结　语

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