Granular Damping Analysis and Design for Structural Vibration Suppression

GOALI项目的目标是开发一种系统的方法，用于分析和设计使用颗粒材料的振动抑制技术阻尼增强。这种阻尼机构对恶劣环境应用具有独特的优势。将发展先进的计算和实验技术来分析/设计颗粒阻尼，其中包括：(a)为了有效和准确地表征颗粒阻尼机制，将开发一种专门用于颗粒阻尼分析的基于分子动力学的新型模拟。(b)为了进一步提高计算效率，为实际应用中的复杂结构提供有效的分析/设计工具，将采用一种新的方法。该方法采用了一种高效改进的蒙特卡罗算法，与分子动力学模拟相比，可以显著降低计算成本。这种新方法可以防止在某些区域出现不切实际的高颗粒体积密度，并可以直接计算颗粒作用于外壳/结构的冲击力/摩擦力。(c)建立接触力学模型识别、降低计算复杂度和阻尼-结构相互作用分析的系统理论。利用这些算法，我们将有能力分析任意多自由度系统在各种载荷条件下的颗粒阻尼。我们将进行一系列的实验研究，包括对实验室板结构的基准案例研究和将在GE进行的实际叶片阻尼分析。颗粒阻尼可以抑制极端温度下的振动。这项研究的结果将有利于发动机和推进、飞机和航天工业。所开发的算法和获得的知识可以进一步用于涉及颗粒分析的各种科学研究和工业应用。这项研究的合作性质将使参与的学生了解现实世界的工程问题，并将为大学带来工业视角。该项目将通过计划中的本科和研究生课程开发以及社区教育项目对教育产生长期影响

The objective of this GOALI project is to develop a systematic methodology for the analysis and design of a vibration suppression technology damping augmentation using granular materials. Such damping mechanism has unique advantage for harsh environment applications.Advanced computational and experimental techniques will be developed to analyze/design granular damping, which include: (a) In order to efficiently and accurately characterize the granular damping mechanisms, a new Molecular Dynamics based simulation which is specifically tailored for granular damping analysis will be developed. (b) In order to further increase the computatuional efficiency and provide an effective analysis/design tool for complicated structures in practical applications, a novel approach will be taken. This approach involves a highly efficient improved Monte Carlo algorithm that can significantly reduce computational cost as compared molecular dynamics simulation. This new method can prevent the occurrence of unrealistically high granular volume density at certain regions and can directly calculate the impact/friction forces that the granules act onto the enclosure/structure. (c) A systematic theory for contact mechanics model identification, computational complexity reduction, and damper-structure interaction analysis will be established. Using these algorithms, we will have the ability to analyze granular damping for arbitrary multi DOF systems under various loading conditions. We will carry out a series of experimental investigations including benchmark case studies on laboratory plate structures and real blade damping analysis to be performed at GE.Granular damping can suppress vibration under extreme temperatures. The outcome of this research will benefit engine and propulsion, aircraft, and space industries. The algorithms developed and knowledge gained can be further utilized in various scientific resear4ch and industrial applications involving granularly analysis. The collaborative nature of this research will allow involved students to understand real-world engineering problems, and will bring industrial perspective to the university. This project will have a long-term impact on education through the planned curriculum development at both undergraduate and graduate levels, as well as in community education programs