A combined numerical-experimental approach for the damping evaluation of nonlinear dissipative vibration systems

非线性耗散振动系统阻尼评估的数值实验相结合方法

• 批准号: 314959828
• 负责人: Dr.-Ing. Lars Panning-von Scheidt
• 金额: --
• 依托单位: Institut für Dynamik und Schwingungen (IDS)
• 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 2020-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/314959828?language=en
• 关键词: combined; numerical; experimental; approach; damping

The dynamics of mechanical structures is essentially affected by the amount of damping, which may be of very different physical nature. Beside material damping these are e.g. in frictional joints such as bolts and flanges, particle dampers, piezo damping and much more. However, the accurate prediction of the damping values still is an open issue. Hence, in this project, a methodology will be developed that is based on the investigation of simple nonlinear surrogate models, resulting from appropriate model reduction techniques. Different nonlinear damping principles may be represented by so-called nonlinear energy sinks (NES) that are attached locally to the host structure. Special attention is paid on the solution of the obtained nonlinear surrogate models, applying procedures like continuation methods, bifurcation analysis, alternating frequency-time-methods, multiharmonic approaches and stability analysis. As a main outcome, the results will give insight in the efficiency and, in particular, the robustness of nonlinear damping devices, in order to evaluate their applicability to structures with uncertain parameters and varying operating conditions. The numerical studies will be accompanied by experiments to validate the methodology.

机械结构的动力学本质上受到阻尼量的影响，阻尼量可能具有非常不同的物理性质。除了材料阻尼之外，这些还有例如用于螺栓和法兰、颗粒阻尼器、压电阻尼等摩擦接头。然而，阻尼值的准确预测仍然是一个悬而未决的问题。因此，在该项目中，将开发一种基于对简单非线性替代模型的研究的方法，该方法是通过适当的模型简化技术得出的。不同的非线性阻尼原理可以通过局部连接到主体结构的所谓非线性能量汇（NES）来表示。特别关注所获得的非线性代理模型的求解，应用连续方法、分岔分析、交替频率时间方法、多谐波方法和稳定性分析等程序。作为主要成果，研究结果将深入了解非线性阻尼装置的效率，特别是其稳健性，以评估其对参数不确定和工作条件变化的结构的适用性。数值研究将伴随着实验来验证该方法。