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.

机械结构的动力学基本上受阻尼量的影响，这种阻尼可能具有非常不同的物理性质。除了材料外，这些都是例如在摩擦接头，例如螺栓和法兰，颗粒阻尼器，压电阻尼等等。但是，对阻尼值的准确预测仍然是一个空旷的问题。因此，在这个项目中，将开发一种方法，该方法基于对简单非线性替代模型的研究，这是由适当的模型还原技术产生的。不同的非线性阻尼原理可以由所谓的非线性能量下水道（NES）表示，这些非线性能量汇（NES）局部附着在宿主结构上。特别注意所获得的非线性替代模型的解决方案，应用程序，例如延续方法，分叉分析，交替的频率时间方法，多摩换方法和稳定性分析。作为一个主要结果，结果将洞悉非线性阻尼装置的效率，尤其是非线性阻尼装置的鲁棒性，以评估其对具有不确定参数和不同操作条件的结构的适用性。数值研究将伴随着验证方法的实验。