摘要
为降低双层圆柱壳动力舱结构振动辐射噪声,对双层圆柱壳进行了减振设计和模型试验研究。基于环肋结构增抗原理和模态振动控制理论,提出了非均匀阻抗增强环肋结构形式;为减小双层壳间振动波的传递,将阻振质量和粘弹性夹层引入到实肋板结构设计中,采用波动理论分析了复合阻波特性。联合应用非均匀阻抗增强环肋和复合阻波肋板设计了一种双层壳模型,并开展了空气中两端简支和水下悬浮激振试验;将设计模型测试结果和数值仿真计算结果与基准模型进行了分析比较。结果表明:设计模型较原结构振动明显减弱,具有较好的减振效果,验证了双层壳结构减振设计的有效性。
In order to reduce vibration and sound radiation noise from power cabin with the type of double cylindrical shells, vibration reduction design on double cylindrical shell and model testing were done. Based on the principle of impedance improving and theory of modal vibration controlling, non-uniformly ring with impedance improved was proposed. As to reduce vibration transmission from rib-plate between double shells,blocking mass and elastic interlayer were introduced into wave attenuation designand characteristics of composite wave attenuation were analyzed by applying wave theory. A type of double cylindrical shell was designed by combining non-uniformly ring with impedance reinforced and wave attenuation rib-plate and model test in air and water were done. The results of testing and numerical calculation for designed model and original model were compared. The results show that designed model vibration is observably lower than original structure. It has a better effect of vibration reduction and could verify the availability of vibration reduction design on double cylindrical shell.
出处
《船舶力学》
EI
CSCD
北大核心
2016年第1期148-158,共11页
Journal of Ship Mechanics
基金
国家自然科学基金(51205404)
国防科技预研基金项目(4011101020101)
关键词
双层圆柱壳
减振设计
阻抗增强
复合阻波
模型试验
double cylindrical shell
vibration reduction design
impedance improved
composite wave attenuation
model testing
