Particle Dampers – Vibration Modification by Distributed Dissipation originating from Complex Particle Shapes and Fluid/Solid Interactions

粒子阻尼器 â 通过源自复杂粒子形状和流体/固体相互作用的分布式耗散进行振动修改

• 批准号: 315008544
• 负责人: Professor Dr.-Ing. Peter Eberhard
• 金额: --
• 依托单位: Institut für Technische und Numerische Mechanik (ITM)
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/315008544?language=en
• 关键词: Particle; Dampers; Vibration; Modification; Distributed

The application of particle dampers is a promising alternative for the modification of vibrations. Particle dampers are working over a large frequency range, they cover additional functions like minimizing noise or being a load bearing part, whereas they are very robust and are applicable over a larger temperature range. Several physical phenomena playing an important role for particle dampers and are interacting to fulfill the features of the damper. Until now there is no satisfying predictive simulation approach which takes the interaction of all those physical processes into account and in doing so is useable for a proper investigation for the understanding of particle dampers.The aim of this project is the more profound understanding of particle dampers for an optimal design. One of the important points for the functionality of a particle damper are the numerous contacts in between the particles and the housing. Therefore, in this project the particles are modeled with the Discrete Element Method (DEM). Due to its mesh-free character it is possible to model the large transient displacements of the particle pile. For influencing the dissipation simple spheres are replaced with non-convex particles. In a first step an algorithm for applying friction between those particles will be developed. A proper scientific investigation is often based on two pillars: simulation and experiment. We want to carry out small experiments in every working task; active experiments with stimulation via a shaker and passive ones with a pendulum. Besides the complex shape of the particles we want to develop a new method to predict the production of sound due to the impact of particles. In doing so, it is possible to optimize a smarter damper which is used for reducing the noise of a working machine, regarding the noise level by itself and simultaneously the resulting energy dissipation. Another point is the filling of the damper consisting of a mixture of solid particles and a fluid. Therefore, the experience in coupling a fluid (modeled by Smoothed Particle Hydrodynamics) with particles will be used to develop a new approach for coupling non-convex particles with a fluid. This approach is used to investigate the potential improvement of energy dissipation when a certain amount of fluid is added. Damage plays an important role in many technical applications. Last but not least we want to implement a simple damage approach into the DEM, between adjacent particles and also the housing and in this way to investigate the influence of damage to the damping.

粒子阻尼器的应用是振动修正的一种有前途的替代方案。粒子阻尼器在很大的频率范围内工作，它们涵盖了额外的功能，例如最小化噪音或作为承载部件，而它们非常坚固并且适用于更大的温度范围。几种物理现象对粒子阻尼器起着重要作用，并且相互作用以实现阻尼器的功能。到目前为止，还没有令人满意的预测模拟方法能够考虑所有这些物理过程的相互作用，从而可用于对粒子阻尼器进行适当的研究。该项目的目的是更深入地了解粒子阻尼器以获得最佳设计。颗粒阻尼器功能的要点之一是颗粒与外壳之间的大量接触。因此，在该项目中，粒子采用离散元法 (DEM) 进行建模。由于其无网格特性，可以对颗粒堆的大瞬态位移进行建模。为了影响耗散，用非凸粒子代替简单的球体。第一步将开发一种在这些粒子之间施加摩擦力的算法。适当的科学研究通常基于两个支柱：模拟和实验。我们要在每一项工作中进行小实验；通过振动器进行主动实验，通过摆锤进行被动实验。除了粒子的复杂形状之外，我们还希望开发一种新方法来预测由于粒子撞击而产生的声音。这样做，可以优化用于降低工作机器噪声的更智能的阻尼器，考虑噪声水平本身并同时考虑由此产生的能量耗散。另一点是阻尼器的填充物由固体颗粒和流体的混合物组成。因此，流体（由平滑粒子流体动力学建模）与粒子耦合的经验将用于开发一种将非凸粒子与流体耦合的新方法。该方法用于研究添加一定量的流体时能量耗散的潜在改善。损伤在许多技术应用中起着重要作用。最后但并非最不重要的一点是，我们希望在相邻粒子和外壳之间的 DEM 中实施一种简单的损伤方法，从而研究损伤对阻尼的影响。