层合复合材料声学性能研究

【作者】 孙卫青；

【导师】 张恒；

【作者基本信息】 郑州大学 ， 材料学， 2003， 硕士

【摘要】 本文利用相关的声学、振动学、材料学和有限元数值方法，首先对层合隔声复合材料的设计原则进行了分析，而后利用有限元方法进行层合复合材料降噪性能预测分析，得到了与实验数据比较吻合的结果。另外对作为层合复合降噪材料重要组份之一的高聚物发泡材料(PUF)的吸声性能进行了探讨，通过有限元方法模拟其粘弹性能对吸声性能的影响，并实验研究了其宏观物理表征与吸声性能的关系。结合有限元数值分析和优化设计理论，针对噪声频谱特性以及要求的降噪效果，进行了材料各组份的厚度的优化设计，以实现材料的经济高效的使用。 研究结果表明对层合复合降噪材料在中低频范围内的应用，有限元数值方法是一个有效而准确的研究和设计途径。更多还原

【Abstract】 By combining the theory of acoustic and vibration, material science and using finite element method(FEM), the design principle for laminated composites was studied in this paper, and then it is presented that the noise reduction can be predicted by finite element method in that it is proved that the FEM results is well coincident with the experimental ones. As an important component in laminated composites, the foamed polymer material (polyurethane foam, PUF) is also studied in this paper. The viscoelastic property’s influence on absorption property is studied by FEM, and the relationship between the macroscopical physical properties and the absorption property is researched by experiment. At last, according to the requirement of noise reduction in a certain frequency scope, we optimized the thickness of each layer in the laminated composites by FEM and optimization theory to realize effective using of material.The study proved that FEM is an effective and accurate method for the laminated composites’ research and designation in middle and low frequency scope.更多还原