Simulation-based Design of Calm Hybrid Particle Dampers with Application to Flexible Multibody Systems

基于仿真的平静混合粒子阻尼器设计及其在柔性多体系统中的应用

• 批准号: 424825162
• 负责人: Professor Dr.-Ing. Robert Seifried
• 金额: --
• 依托单位: Institut für Mechanik und Meerestechnik
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/424825162?language=en
• 关键词: Simulation; based; Design; Calm; Hybrid

Particle dampers are simply designed passive damping elements. Granular particles are embedded in a container attached to a vibrating structure or within holes embedded in the vibrating structure. Due to the structural vibrations momentum is transferred to the granular material and energy is dissipated due to inter-particle impacts and frictional effects. In the last decades there has been an increased interest in particle dampers. Particle damping is easy to apply even in already existing hardware and it has been shown that it can be at least as effective as other damping techniques. This effectiveness in dissipating energy is not restricted to a single frequency but exists over a broader frequency range which is not usual in conventional damping solutions. Moreover, particle dampers are highly adaptive with various forms and sizes and a variety of particle types and materials.Numerical and experimental analysis performed in the first project phase has shown that the vast portion of kinetic energy dissipation is due to impacts. Thus, the coefficient of restitution (COR) should be as small as possible to dissipate maximal energy. In order to allow the transfer of significant kinetic energy from the vibrating structure onto the particles, heavy metallic particles such as steel, brass or even tungsten are advantageous. For these materials FE simulation show that the COR is relatively high for inter-particle impacts, providing a limitation on the kinetic energy dissipation. Another major drawback of particle dampers using metallic particles is the generation of considerable noise due to impacts. There have been first attempts using particle dampers made of polymer particles, however due to their much lower particle weight their damping effect is smaller than using heavier metallic particles.The research objective is the further development of a new simulation-based design methodology for passive vibration damping of lightweight structures and machines using distributed particle dampers. Hereby this project aims to develop a completely new type of hybrid particle dampers. Thereby, additional design degrees of freedom are introduced by using two different types of materials to decouple in some extend the mass and the coefficient of restitution of the individual contacts. Hereby, a heavy metallic material should be paired with a viscoelastic material with high damping capability during dynamic loading. With this approach, a completely new design philosophy should be developed to obtain small particle dampers, which dissipate significant more energy than optimized homogenous particle dampers of comparable mass. As a side-effect it is also expected, that these hybrid particle dampers are significantly calmer than the classical particle dampers.

颗粒阻尼器是一种设计简单的被动阻尼元件。粒状颗粒嵌入在附接到振动结构的容器中或嵌入在振动结构中的孔内。由于结构振动，动量被传递到颗粒材料，并且由于颗粒间的碰撞和摩擦效应而耗散能量。在过去的几十年里，人们对颗粒阻尼器的兴趣越来越大。即使在现有的硬件中，粒子阻尼也很容易应用，并且已证明它至少与其他阻尼技术一样有效。这种耗散能量的有效性不限于单一频率，而是存在于更宽的频率范围内，这在传统的阻尼解决方案中是不常见的。此外，颗粒阻尼器对各种形式和尺寸以及各种颗粒类型和材料具有高度适应性。在第一项目阶段进行的数值和实验分析表明，动能耗散的很大一部分是由于冲击造成的。因此，恢复系数（COR）应尽可能小，以耗散最大能量。为了允许将显著的动能从振动结构传递到颗粒上，重金属颗粒例如钢、黄铜或甚至钨是有利的。对于这些材料，有限元模拟表明，COR相对较高的颗粒间的影响，提供了一个限制的动能耗散。使用金属颗粒的颗粒阻尼器的另一个主要缺点是由于冲击而产生相当大的噪音。已经有第一次尝试使用聚合物颗粒制成的颗粒阻尼器，然而，由于其低得多的颗粒重量，其阻尼效果小于使用较重的金属particle.The研究的目标是进一步发展的一种新的基于仿真的设计方法，用于被动振动阻尼的轻质结构和机器使用分布式颗粒阻尼器。因此，本项目旨在开发一种全新的混合颗粒阻尼器。因此，通过使用两种不同类型的材料来引入附加的设计自由度，以在一定程度上解耦各个触头的质量和恢复系数。因此，重金属材料应该与在动态加载期间具有高阻尼能力的粘弹性材料配对。采用这种方法，应开发一种全新的设计理念，以获得小颗粒阻尼器，它比优化的同类质量的颗粒阻尼器消耗更多的能量。作为一个副作用，它也预计，这些混合粒子阻尼器是显着平静比经典的粒子阻尼器。