Structural-Acoustic Analysis and Optimization of Novel Composite Sandwich Structures with Anisotropic Materials for Better Noise and Vibration Isolation

该项目旨在开发新型夹层结构，以解决汽车、飞机和直升机等各种陆地和空中交通工具的声音传输问题。 该研究概念的灵感来自于最近发现的由各向异性材料制成的夹层结构，具有法向剪切耦合以减少声音传播。 拟议的研究包括微观结构材料建模、结构声学分析和夹层结构优化以实现最小声音传输的综合努力。 该项目的目标如下： 1．建立描述各向异性材料夹芯结构静态和动态行为的数学理论，为夹层结构的结构声学分析和优化提供基础。 2．对各向异性芯材平面和曲面夹层结构的隔声机理进行深入研究，研究声波入射角和结构曲率对声音传播的影响。 3．针对各种材料和几何参数对夹层结构的声音传输进行优化研究，开发具有优异声学性能的夹层结构，并为此类夹层结构的材料选择和制造提供指导。传统上，复合材料的研究重点之一是轻质高强层合板，但声学性能较差。 声音传输问题确定了对新型复合材料的需求。 该项目预计将开发一系列关于通过各向异性材料制成的夹层结构声音传输的物理机制的新知识，以及建模、分析和优化各向异性结构的新方法。 该项目产生的技术将产生广泛的社会影响，并可能增强美国工业生产更安静的飞机、直升机和汽车的能力。 此外，该项目将涉及女性和其他代表性不足的少数群体，并鼓励这些群体的学生从事工程研究职业。

This project aims to develop novel sandwich structures to address the sound transmission problem in various land and air vehicles such as automobiles, airplanes, and helicopters. The research concept is motivated by the recent findings of sandwich structures made of anisotropic materials with normal-to-shear coupling to reduce sound transmission. The proposed research consists of an integrated effort of micro-structural material modeling, structural-acoustic analysis, and optimization of sandwich structures for minimum sound transmission. The objectives of the project are as follows:1. To develop a mathematical theory describing the static and dynamic behavior of sandwich cores made of anisotropic materials, and to provide a foundation for structural-acoustic analysis and optimization of sandwich structures.2. To carry out an extensive investigation of the sound isolation mechanism of flat and curved sandwich structures with anisotropic cores, and a study of the effect of incident angle of the sound wave and curvature of the structure on sound transmission.3. To conduct an optimization study of sound transmission of sandwich structures with respect to various material and geometric parameters, and to develop sandwich structures with superior acoustic performance and guidelines for material selection and manufacturing of such sandwich structures.Traditionally, one of the research foci in composites has been lightweight and high strength laminates often with poor acoustic performance. The sound transmission problem identifies the needs for new composite materials. The project is anticipated to develop a body of new knowledge on the physical mechanism of sound transmission through sandwich structures made of anisotropic materials, and new methods for modeling, analyzing and optimizing anisotropic structures. The resulting technology of this project will have a broad social impact, and will likely enhance the ability of American industry to produce quieter aircraft, helicopters and automobiles. Furthermore, this project will involve women and other under-represented minorities, and encourage students from these groups to pursue a career in engineering research.