摘要
[目的]为探究芯材对格栅夹层板振动的影响规律,[方法]以格栅夹层板为研究对象,通过试验对比浮力材料格栅夹层板和橡胶格栅夹层板在不同状态下的振动响应差异,重点分析芯材对两型板抑振效果的影响。[结果]结果表明,空气中浮力材料格栅夹层板在中低频段(0~1000Hz)内的振动响应较低,橡胶格栅夹层板在高频段(1000~3000Hz)内的振动响应较低;水中由于附加质量及附加阻尼效应的影响,夹层板体质量和芯材阻尼因素对板振动响应的影响程度被弱化,夹层结构的整体及板格局部弯曲刚度成为主导性影响因素,浮力材料格栅夹层板在全频段(0~3000Hz)内的振动响应均低于橡胶格栅夹层板的。[结论]为降低振动响应,格栅夹层板芯材的刚度应接近格栅的刚度;此外,芯材密度越小,阻尼越低,格栅夹层板在空气中和水中的振动响应差异就越大。
[Objectives] To explore the influence of core materials on the vibration of composite grid sandwich panels,[Methods] taking the panels as the research object,the vibration response of rubber-core grid sandwich panels and buoyancy-core grid sandwich panels under different conditions is compared by means of experiment,with emphasis given to the analysis of vibration suppression effect of core material on the two composite panels.[Results]The results show that the mid-frequency and low-frequency(0-1 000 Hz) vibration response of the buoyancy-core grid sandwich panels in air is low,while the high-frequency (1 000-3 000 Hz)vibration response of the rubber-core grid sandwich panels is low. The influence of the factors such as the mass of the sandwich panel and the damping of the core on the vibration response of the panel is weakened due to the added mass effect and the added damping effect and the integral of the sandwich structure and the local bending stiffness of the panel are the main factors. The vibration response of the buoyancy-core grid sandwich panel within full-frequency band(0-3 000 Hz)is lower than that of the rubber-core grid sandwich panel.[Conclusions]To reduce the vibration response of the panel,the core stiffness of the grid sandwich panel shall be close to the grid stiffness. In addition,the smaller the density and damping of the core,the greater the difference between the vibration response in air and water.
作者
刘建良
梅志远
张焱冰
唐宇航
成天健
Liu Jianliang;Mei Zhiyuan;Zhang Yanbing;Tang Yuhang;Cheng Tianjian(College of Naval Architecture and Ocean Engineering,Naval University of Engineering,Wuhan 430033,China;Naval Research Academy,Beijing 100161,China;Wuhan Hiway Naval Architecture and Ocean Engineering Technology Co.,Ltd.,Wuhan 430033,China)
出处
《中国舰船研究》
CSCD
北大核心
2019年第4期1-6,13,共7页
Chinese Journal of Ship Research
基金
国家自然科学基金资助项目(51609252)
关键词
格栅夹层
振动响应
附加质量
附加阻尼
grid sandwich
vibration response
added mass
added damping
