﻿ 阻尼复合材料在舰船筏架中的应用研究
 舰船科学技术  2018, Vol. 40 Issue (4): 58-62 PDF

Research on the applications of damping composite materials for shiping raft frame
KANG Feng-hui, WU Yi-bo, YANG Rui-rui, GUO Wan-tao
Luoyang Ship Material Research Institute, Luoyang 471023 China
Abstract: A numerical simulation method were employed to investigate the effects of the elastic moduli, material damping parameters and thickness for every panel of the composite raft frame on the vibration isolation. The results indicate that increasing the modulus and damping parameters of the composite favors vibration reduction performance, increasing the upper panel thickness favors high frequency vibration reduction performance of composite foundation, and increasing ribbed panel thickness favors high frequency vibration reduction performance of composite foundation. Vibration reduction effect is relatively small by changing lower panel thickness. According to the simulation results, one kind of structure type of composite foundation was designed and fabricated. At last, the correctness of simulation results was verified by the vibration test.
Key words: composite raft frame     vibration isolation     elastic moduli     material damping parameters     panel thickness
0 引　言

1 复合材料筏架静力学分析

 $D = \frac{{E{h^3}}}{{12(1 - {\mu ^2})}}\text{。}$ (1)

 图 1 筏架结构图 Fig. 1 The structure chart of the raft frame

2 复合材料筏架振动特性仿真分析

 $\left[ { M} \right]\left\{ {\ddot x} \right\} + \left[ { C} \right]\left\{ {\dot x} \right\} + \left[ { K} \right]\left\{ x \right\} = \left\{ { F} \right\}\text{，}$ (2)

 图 2 动力学仿真分析有限元模型 Fig. 2 The finite element model built of the raft frameby dynamic simulation analysis

 ${L_{{A}}} = 10{\rm{lo}}{{\rm{g}}_{10}}\left[ {\frac{1}{n}\sum\limits_{i = 1}^n {{{10}^{{L_i}/10}}} } \right]\text{，}$ (3)
 $L_D = {L_{A{\text{壳}} - {\text{钢}}}} - {L_{A{\text{壳}} - {\text{复}}}}\text{。}$ (4)

2.1 材料模量对复合材料筏架减隔振性能影响

 图 3 复合材料筏架不同模量时减隔振效果曲线 Fig. 3 The vibration isolation curves of the composites raft frame with different moduli

2.2 材料阻尼性能对复合材料筏架减隔振性能影响

 图 4 复合材料筏架不同阻尼损耗因子时减隔振效果曲线 Fig. 4 The vibration isolation curves of the composites raft frame with different loss factors

2.3 上面板厚度改变对筏架减振性能影响研究

 图 5 复合材料筏架减隔振效果随上面板厚度变化曲线 Fig. 5 The vibration isolation curves of the composites raft frame with different upper panel thickness
2.4 肋板厚度改变对筏架减振性能影响研究

 图 6 复合材料筏架减隔振效果随肋板厚度变化曲线 Fig. 6 The vibration isolation curves of the composites raft frame with different ribbed panel thickness
2.5 下面板厚度改变对筏架减振性能影响研究

 图 7 复合材料筏架振减隔振效果随下面板厚度变化曲线 Fig. 7 The vibration isolation curves of the composites raft frame with different lower panel thickness
3 复合材料筏架结构设计及验证

 图 8 测点布置图 Fig. 8 Layout of the measuring points

 图 9 两筏架各测点振动加速度级对比图 Fig. 9 The vibration accelerations at different measuring points of the two raft frames

 图 10 耐压壳体上复合材料筏架相对于钢筏架系统减隔振效果图 Fig. 10 The differences of vibration acceleration values between the composites raft frame and the steel one in different frequencies

4 结　语

1）复合材料筏架各面板厚度为钢筏架厚度2.5倍以上时，可保证复合材料筏架刚度不小于钢筏架刚度；

2）提高复合材料筏架阻尼和模量，均能提高复合材料筏架系统的减隔振性能。

3）复合材料筏架上面板厚度增大对筏架高频减振具有较明显的效果，而复合材料筏架肋板厚度增大对中低频段减振具有明显的效果，改变下面板厚度对筏架减振效果不明显；

4）所设计的复合材料筏架，相比于约束阻尼处理的钢筏架，10~10 000 Hz全频段内减隔振效果提高约10 dB，10~315 Hz低频段减隔振效果提高约3 dB。

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