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总览 评价 沈承 , 辛锋先 , 卢天健 * ( 西安交通大学 航天航空学院 机械强度与振动国家重点实验室; ) 摘要: 复合材料加筋板因其具有高比刚度,比强度以及优良的可设计性特点,在航空航天以及船舶与海洋工程领域得到了广泛的应用。本文通过改变复合材料
沈承, 辛锋先, 卢天健*
(
西安交通大学 航天航空学院 机械强度与振动国家重点实验室; )
摘要:
复合材料加筋板因其具有高比刚度,比强度以及优良的可设计性特点,在航空航天以及船舶与海洋工程领域得到了广泛的应用。本文通过改变复合材料基板和加筋梁的材料参数,以传声损失作为目标函数对结构的声学特性进行优化研究。在之前建立的有关全复合材料加筋板传声损失理论模型基础上,考虑到问题的多模特征,采用遗传算法对结构的辐射声压进行优化设计。数值结果表明,对于复合材料单板,最优传声损失区域主要是由结构的吻合频率决定,如果优化频段在较低频,尽量让吻合频率更高,如果目标频率在较高频,则需要吻合频率尽可能低;由于加筋的引入,复合材料加筋板传声损失曲线变得异常复杂,没有简单的规律可用于指导优化分析,但借助于遗传算法仍然可以得到有效的优化结果。
关键词:
固体力学;复合材料;加筋板;传声损失;遗传算法
SHEN Cheng, XIN Fengxian, LU Tianjian*
(
State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace,Xi'an Jiaotong University; )
Abstract:
In consideration of high specific stiffness and strength, stiffened compostie plate has been applied in aerospace or ships industry. In this paper, the aim is to optimize structural acoustic property by changing material parameters of base plate. On the basis of previous theoretical models about sound transmission loss of all composite stiffened plate, and in view of multimode characteristic of problem, genetic algorithm is used to implement specific optimization design. Results show that: For composite single plate, coincidence frequency can decide optimal STL region, more precisely, coincidence frequency should be made as high as possibe if interested objective frequency is very low, and the opposite is the case for high objective frequency; For stiffened composite plate, no simple rules can be found to directly explain physical mechanism of optimal reuslts for complex STL curves, but genetic algorithm is still found to be an efficient optimization method.
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