Calming Vibrational Systems by Optimized Placement of Novel Situation-Aware Frictional Damper Elements

通过优化新型情境感知摩擦阻尼器元件的放置来镇静振动系统

• 批准号: 314915277
• 负责人: Professor Dr.-Ing. Alexander Fidlin
• 金额: --
• 依托单位: Bereich Dynamik / Mechatronik
• 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/314915277?language=en
• 关键词: Calming; Vibrational; Systems; Optimized; Placement

Continuously increasing costs of fossil energy carriers and tightening legal regulations in the last years require high energy efficiency in all types of machinery. Consequently, in order to increase efficiency, the impact of friction and other damping influences is systematically reduced. On the other hand, the strong trend to light weight design makes mechanical structures even more sensitive against vibrational excitation. Thus, it is necessary to calm vibrations effectively and tightly focused without influencing the desired operation and decreasing the efficiency of a mechanism as a whole. Hence, the development of new types and innovative designs of damping devices (DD) is inevitable for protecting machines from undesired vibrations.Usually neglected nonlinearities of damping forces may offer a particularly huge potential to design situation-dependent behavior without the need to implement a controller or supply additional energy. Especially dry friction forces with stick-slip transitions make it possible to design elements that switch their behavior and thus can serve as basic components for DDs adapting themselves to the current situation.For 1-DoF-systems the impact of dry friction damping on forced oscillations has been extensively discussed in the literature. Friction based DDs are mainly based on the dissipative properties of friction forces and either utilize the constructive friction which is inherently present in almost all joints or are based on deliberately designed machine components with localized or distributed friction. Unfortunately significantly less attention has been payed to the effects occurring in systems with many DOF and especially to the optimal placement of the friction based dissipative elements and to the strongly non-linear interactions between them and the original structure. The main objective of the project is to investigate how novel friction-based DDs can be used for the focused reduction of forced vibrations. Beyond the analysis of these devices, also efficient approaches will be devised, enabling to configure and place them on mechanical systems in an optimal way. In order to achieve this overall goal, various DDs based on appropriate combinations of four basic elements (sequential friction-spring, modulated normal load, sequential backlash-friction and distributed friction) will be compared with respect to their ability to provide energy-efficient and situation-aware behavior. Analytical methods will be developed which allow to evaluate the efficiency of these devices in oscillating systems in a reliable way. Using both analytical and numerical optimization techniques, the aspect of a sensible placing of the DDs within the basic structure will be investigated, taking interactions between these strongly non-linear elements into account. The most promising devices will be prototyped and tested experimentally.

近年来，化石能源运输成本的不断增加和法律法规的收紧要求所有类型的机械都具有高能效。因此，为了提高效率，系统地减少了摩擦和其他阻尼影响的影响。另一方面，轻量化设计的强劲趋势使得机械结构对振动激励更加敏感。因此，有必要有效地平息振动并紧密集中，而不影响所需的操作并降低整个机构的效率。因此，为了保护机器免受不良振动的影响，新型阻尼装置（DD）的开发和创新设计是不可避免的。通常被忽略的阻尼力非线性可能为设计与情况相关的行为提供了特别巨大的潜力，而无需实施控制器或提供额外的能量。特别是具有粘滑过渡的干摩擦力使得设计能够切换其行为的元件成为可能，因此可以作为 DD 适应当前情况的基本组件。对于 1-DoF 系统，干摩擦阻尼对受迫振动的影响已在文献中进行了广泛讨论。基于摩擦的 DD 主要基于摩擦力的耗散特性，并且利用几乎所有关节中固有的结构摩擦，或者基于精心设计的具有局部或分布式摩擦的机器部件。不幸的是，人们很少关注多自由度系统中发生的效应，特别是基于摩擦的耗散元件的最佳放置以及它们与原始结构之间的强非线性相互作用。该项目的主要目标是研究如何使用基于摩擦的新型 DD 来集中减少受迫振动。除了对这些设备进行分析之外，还将设计有效的方法，从而能够以最佳方式配置它们并将其放置在机械系统上。为了实现这一总体目标，将比较基于四种基本元件（顺序摩擦弹簧、调制法向载荷、顺序齿隙摩擦和分布式摩擦）适当组合的各种 DD 提供节能和态势感知行为的能力。将开发分析方法，以可靠的方式评估振荡系统中这些设备的效率。使用分析和数值优化技术，将研究在基本结构中合理放置 DD 的方面，同时考虑这些强非线性元素之间的相互作用。最有前途的设备将进行原型设计并进行实验测试。