Vibroacoustic modeling and design of sandwich and composite lightweight structures with innovative noise control materials

采用创新噪声控制材料的夹层和复合材料轻质结构的振动声学建模和设计

• 批准号: 138158-2010
• 负责人: Atalla, Noureddine
• 金额: $ 4.23万
• 依托单位: Université de Sherbrooke
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2014
• 资助国家: 加拿大
• 起止时间: 2014-01-01 至 2015-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=545492
• 关键词: Vibroacoustic; modeling; design; sandwich; composite

Interior noise is an important consideration in the design and operation of virtually all aerospace, railways and automotive vehicles. The interior sound level is primarily controlled by the properties and complexity of the main structure and the attached sound proofing materials. Large composite panels and sandwich trims are now commonly used. Such assemblies are lightweight and resistant, but they do not provide sufficient sound isolation or vibration damping. High vibration levels and cabin noise must be reduced in order to meet with new incoming vibration and noise regulations. This requires a detailed and fundamental investigation of their noise transmission mechanisms and the design of specific Noise control treatments. This is the main objective of the proposed research program. It is aimed at identifying, understanding, quantifying and optimizing through modeling and testing, the transmission and dissipation mechanisms through composite and sandwich structures, and on this basis developing new noise control acoustic materials. The specific objectives are: (i) to develop and experimentally validate full frequency spectrum numerical models for sandwich and composite complex structures (ribbed, curved, double walls with trim mounts and sound packages) under various excitations (diffuse acoustic field, mechanical, Turbulent Boundary Layer...); (ii) to investigate the acoustic and vibration performance of Honeycomb sandwich structures with embedded damping (viscoelastic, felt), (iii) to investigate and develop innovative multifunctional materials with higher absorption performance at low to mid frequencies; in particuler double porosity materials, smart foams, multilayers with microporous resistive screens and (iv) to design and test an optimized fully representative aircraft composite sidewalls with sound package, sandwich trim panel and mounts (proof of concept). The proposed research addresses these challenging issues using a combination of state of the art computational methods (Analytical methods, Finite and Boundary Element Methods, Statistical Energy Analysis, Hybrid methods ...) and experimental tools. The latter are undertaken to (i) elucidate the main physical phenomena, (ii) characetrize the studied structures and acoustc materials, (iii) verify the prediction of the current and developed modeling tools, and (iv) demonstrate the potential benefit of the developed design and concepts. The proposed research is generic in nature. It is of interest to several industries such as aerospace, automotive, railway and building.

内部噪声是几乎所有航空航天、铁路和汽车的设计和操作中的一个重要考虑因素。室内声级主要由主体结构及附属隔音材料的性质和复杂程度控制。现在普遍使用大型复合板和三明治装饰。此类组件重量轻且坚固，但它们不能提供足够的隔音或减振功能。必须降低高振动水平和机舱噪音，以满足新的振动和噪音法规。这需要对其噪声传播机制进行详细和基础的研究，并设计具体的噪声控制处理方法。这是拟议研究计划的主要目标。旨在通过建模和测试来识别、理解、量化和优化复合材料和夹层结构的传输和耗散机制，并在此基础上开发新型噪声控制声学材料。具体目标是：（i）开发并通过实验验证夹层和复合材料复杂结构（带装饰安装座和声音包的肋状、弯曲、双壁）在各种激励（扩散声场、机械、湍流边界）下的全频谱数值模型层...）; (ii) 研究具有嵌入式阻尼（粘弹性、毛毡）的蜂窝夹层结构的声学和振动性能，(iii) 研究和开发在中低频率下具有更高吸收性能的创新多功能材料；详细的双孔隙材料、智能泡沫、具有微孔电阻屏的多层材料以及(iv) 设计和测试具有声音包、夹层装饰板和支架的优化的完全具有代表性的飞机复合材料侧壁（概念验证）。 拟议的研究结合使用最先进的计算方法（分析方法、有限元和边界元方法、统计能量分析、混合方法……）和实验工具来解决这些具有挑战性的问题。后者的目的是（i）阐明主要物理现象，（ii）描述所研究的结构和声学材料的特征，（iii）验证当前和开发的建模工具的预测，以及（iv）证明开发的模型的潜在好处设计和概念。 拟议的研究本质上是通用的。它引起了航空航天、汽车、铁路和建筑等多个行业的兴趣。