摘要
基于目标传递法和代理模型实现了水下结构振动声辐射的设计优化。目标传递法用于实施多级优化,Kriging代理模型用于解决水下结构振动声辐射计算量过大而无法实施设计优化的问题。以水下加肋板结构的振动声辐射为例构造了一个两级优化设计问题来验证所用方法的有效性。选取板厚,加强肋高度和加强肋宽度作为设计变量,以结构质量、共振频率、共振频率处的声功率级和共振频率间的差值作为优化目标来进行设计优化。研究结果表明Kriging代理模型可实时准确地代替耦合计算模型预报水下结构振动声辐射响应,使用目标传递法会由于目标权重和协调机制的不同而导致不同的优化结果,设计者可以根据实际需要从优化结果中选择合适方案。
Target cascading and surrogate model were employed for design optimization of underwater structural vibration and acoustic radiation.The target cascading was used for multilevel optimal design and the Kriging surrogate model based on computational efficieney was applied for predicting vibro-acoustic response.A design optimization problem of a two-level modeling hierarchy of a stiffened plate underwater was formalized to show the optimization procedure.The design variables were the plate thickness and the stiffener dimensions.The objectives of the optimization included the minimization of the structural mass,the maximization of the fundamental resonant frequency and the minimization of the corresponding radiated power level,and the maximization of the difference between the two chosen resonant frequencies.The results showed that the surrogate model gives very good approximation of the coupled computation model for predicting the resonant frequency and the corresponding sound power level with no computation time delay;the target cascading can be properly used for design optimization with different design tasks and different coordination strategies.
出处
《振动与冲击》
EI
CSCD
北大核心
2010年第10期144-147,共4页
Journal of Vibration and Shock
基金
国家自然科学基金资助项目(10972046)
关键词
目标传递
代理模型
振动
声辐射
设计优化
target cascading
surrogate model
vibration
sound radiation
design optimization
