﻿ 高速型船舶振动响应计算分析
 舰船科学技术  2018, Vol. 40 Issue (1): 23-26 PDF

Calculation and analysis on high speed vessel vibration response
LI Jian-zhang
The 716 Research Institute of CSIC, Lianyungang 222000, China
Abstract: High speed vessel is characterized by high speed, low rigidity and high frequency. Thus vibration becomes a very prominent problem during the process of designing. This essay calculates and analyses the inherent frequency and vibration response for the vessel’s sensitive spots based on finite element and modal analysis method and provides a calculation method suitable for high speed vessel vibration intensity, which consequently poses guiding significance to high speed vessel design and construction.
Key words: high speed vessel     inherent frequency     frequency reserves     modal analysis     vibration response
0 引 言

1 高速船振动衡量准则 1.1 固有频率储备衡量准则

 图 1 幅频响应曲线 Fig. 1 Amplitude-frequency response curve

 $\frac{1}{\gamma } \leqslant 0.6\text{或}\frac{1}{\gamma } \geqslant 1.3{\text{。}}$
1.2 振动响应衡量准则

2 计算模型的建立

 图 2 边界条件示意图 Fig. 2 Schematic diagram of boundary condition
3 桨塔与短舱固有频率计算及振型分析

fi为结构固有频率；fet为推进主机额定频率；fez为螺旋桨轴频率；fey为螺旋桨叶频率；YES为满足频率储备的要求；NO为不满足频率储备的要求。

 图 3 f=2.748 Hz（横向振型） Fig. 3 f=2.748 Hz (transverse vibration mode)

 图 4 f=6.789 Hz（纵向振型） Fig. 4 f=6.789 Hz (longitudinal vibration mode)

 图 5 f=11.34 Hz（扭转振型） Fig. 5 f=11.34 Hz (retortion vibration mode)

 图 6 f=12.402 Hz（垂向振型） Fig. 6 f=12.402 Hz (vertical vibration mode)
4 振动响应计算分析

4.1 激振力的计算

 $\vec P = mv\cos wt\vec i - mv\sin wt\vec j,$
 $\frac{{{\rm d}\vec P}}{{{\rm d}t}} = {F_X}\vec i + \left( {{F_y} - mg} \right)\vec j{\text{。}}$

4.2 激振力的施加

 图 7 激振力施加示意图 Fig. 7 Schematic diagram of applying excited force
4.3 振动响应计算分析

 图 8 激振力下的速度响应曲线 Fig. 8 Velocity response curve

 图 9 激振力下的加速度响应曲线 Fig. 9 Acceleration response curve

5 结 语

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