航空航天飞行器、舰船等大量工程结构中的声振现象的共性本质是波动，而实现这类结构减振降噪的一个共性基础正是波的操控。声学黑洞是通过薄壁结构厚度或者材料特性的梯度变化，实现波的减速、聚焦等操控。本项目主要研究基于声学黑洞的工程结构中波操控的力学问题，此研究是学科前沿，不仅具有重要的科学意义，而且直接与工程中的声振问题和能量回收技术相结合，具有广阔的应用前景。在前期力学建模和控制等相关研究的基础上，探究结构中的声学黑洞效应。建立研究此类结构波传播与操控问题的建模和分析方法，重点探索声学黑洞现象的特征行为和波传播演变过程。揭示声学黑洞现象背后的物理机制，深刻认识声学黑洞结构在多物理场耦合情况下各参数的影响规律。积极拓展声学黑洞结构在减振降噪、能量回收等工程领域中的应用，发现声学黑洞的声辐射机制和多物理场耦合能量聚集效应，提出结构优化设计方法，满足工程实际应用。

The fundamental nature of all vibration and acoustic phenomena in engineering structures, such as aircraft, spacecraft and ocean vessels, is wave motion. Futhermore, wave manipulation, such as change of propagation path, focusing, trapping and damping, is the foundation for vibration and noise suppression in these structures. Hence, wave manipulation starts to draw the ever-increasing attention in the scientific community. The development of the so-called acoustic meta-material is just one of the typical examples to evidence the effort that people are making in manipulating waves such as optical or acoustic waves. Acoustic Black Hole (ABH) is another phenomenon which starts to arouse the interest of the vibration community primarily during the last decade. ABH effect takes advantages of the propagation properties of the structure-borne waves in thin-walled structures. By reducing the wall thickness according to a power-law profile, the local phase (and the group) velocity of the flexural waves gradually reduces, theoretically approaching zero reaching the wedge end. In an ideal scenario, this results in zero reflection and total energy absorption with a small amount of damping materials. . Despite the past effort, the research, as well as the exploration of the ABH, is still in its infancy. Two fundamental scientific problems need to be solved in order to push the ABH-based technology to the next level: 1) Understanding of the wave trapping process of the ABH, especially in the presence of geometrical and fabrication uncertainties, is insufficient. 2) The crucial issue of the coupling between the ABH and the damping layer coating is not well apprehended by the existing models. Bothe issues hamper the design and realization of the ABH effect in practice. In terms of engineering applications, structure-borne noise control based on ABH feature is also a new topic which has not been fully explored. Meanwhile, the design issue of effectively producing the ABH effect while ensuring the mechanical rigidity and integrity of the structure also needs to be tackled before the ABH technique can find more real-world engineering applications.. The general objective of the project is therefore twofold. From the basic research viewpoint, this project attempts to provide solutions to the two aforementioned fundamental problems. From engineering application viewpoint, the feasibility of manipulating structure-borne energy for sound radiation and transmission control, along with the understanding of the underlying physics, will be explored. Meanwhile, we shall examine various ABH designs to suit engineering applications. The significance of the project lies in its direct applicability to a wide range of noise control and energy harvesting problems. In a broader sense, the problem under investigation is fundamental and generic in nature, which has significant scientific value for advancing the state-of-the-art in vibration and noise control engineering.