轻质弱辐射的阻尼夹芯复合材料圆柱壳的优化设计  

Optimization for composite cylindrical shells with light and weak-radiation damping sandwich

作　　者：王石 赵兴乾 仝博[4] WANG Shi;ZHAO Xingqian;TONG Bo(Research and Academic Service,Naval University of Engineering,Wuhan 430033,China;Institute of Noise&Vibration,Naval University of Engineering,Wuhan 430033,China;National Key Laboratory on Ship Vibration&Noise,Wuhan 430033,China;College of Naval Architecture and Ocean Engineering,Naval University of Engineering,Wuhan 430033,China)

机构地区：[1]海军工程大学科研学术处,武汉430033 [2]海军工程大学振动噪声研究所,武汉430033 [3]船舶振动噪声重点实验室,武汉430033 [4]海军工程大学舰船与海洋学院,武汉430033

出　　处：《振动与冲击》2020年第16期7-15,共9页Journal of Vibration and Shock

基　　金：国家自然科学基金(51705529)。

摘　　要：基于三维弹性理论,对阻尼夹芯复合材料圆柱壳在简谐点力作用下的振动声辐射进行优化研究。建立了以总质量、基频和模态阻尼为优化目标的多目标函数优化模型,对纤维层和芯层厚度分布和铺层方式进行优化设计;经与其他文献及"有限元+边界元"法得到的结果对比,验证了三维弹性理论的计算结果的有效性;分析了三明治夹芯圆柱壳的振动和声辐射的影响因素,发现芯层中面线位置高于整壳中面线时有利于提高基频,降低声辐射功率;且随着铺层角的增加,固有频率呈抛物线型变化趋势,模态阻尼比则逐渐减小。经优化设计,声功率一阶共振频率向高频方向偏移20 Hz,最大声功率降低11.66 dB,200 Hz以下的低频段,声功率峰值密度明显降低。The vibration and acoustic radiation of composite cylindrical shells(CCDS)with damping sandwich activated by pointed harmonic force were studied based on the three-dimensional elastic theory(TDET).A multi-objective function optimization model was built,whose optimization objectives were total mass,fundamental frequency and model damping.The model was used to optimize the thickness distribution of fiber and sandwich layer as well as the modes of lay-up.The effectiveness of TDET was confirmed after compared with the results of other literatures and the"FE-BE"method.The influencing factors for vibration and acoustic radiation of CCDS with damping sandwich were analyzed.It is revealed that when the sandwich layer’s median line is higher than the whole shell’s,it is favorable for increasing the fundamental frequency and reducing acoustic radiation power.With the increasing of lay-up angle,the natural frequency changes in the shape of parabola and modal damping ratio decreases gradually.After optimization,the first modal frequency of acoustic radiation power shifts to higher frequency by 20 Hz and maximum acoustic power decreases by 11.66 dB.The peak value density decreases apparently in the low-frequency stage under 200 Hz.

关 键 词：复合材料圆柱壳(CCDS) 阻尼夹芯 振动声辐射 尺度优化 铺层优化 

分 类 号：U661.44[交通运输工程—船舶及航道工程]