Understanding and improving energy dissipation and vibration damping in structures subject to self-excited irregular vibrations – linking data driven approaches with modelling

了解和改善受自激不规则振动影响的结构中的能量耗散和振动阻尼 – 将数据驱动方法与建模联系起来

• 批准号: 314996260
• 负责人: Professor Dr. Norbert Hoffmann
• 金额: --
• 依托单位: Institut für Strukturdynamik
• 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 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/314996260?language=en
• 关键词: Understanding; improving; energy; dissipation; vibration

The focus of the project is on the development of a method to analyse and characterise the influence and role of damping design elements and dissipation mechanisms in multi-component systems with self-excitation subject to complex system states and manifold load cases.While for regular dynamics, i.e. stationary periodic response or linear transients, damping elements and mechanisms can be described with standard techniques, for irregular dynamics it is a largely unsolved problem to identify sources and sinks of energy or even the flow of energy in structures. In addition, most technical systems contain a plethora of local nonlinearities and damping elements, e.g. the joints and contact interfaces of the system, and are subject to a multitude of different load cases. This causes a challenging scenario for the assessment of damping devices. In the irregular vibrational state the manifold energy sinks are in constant interaction. At the latest, the additional complexity caused by the manifold load cases makes the application of simple bottom-up physics-based damping or dissipation description for the assessment of damping devices impossible. Hence, new techniques to characterize damping design elements are required. In this context we propose developing methods for the thorough analysis of the vibration response as well as the structural, damping and load parameters. The first part will focus on developing the analysis and computational methods for studying damping devices in friction-excited systems subject to irregular vibrations and is restricted to computer modelling and data derived from numerical models. In this context methods from nonlinear time series analysis and multivariate statistics are employed and combined. The central element is the data matrix M which is filled with characteristic quantities from different classes for multiple load cases. The final result is a procedure for the assessment and optimization of damping devices and dissipation mechanisms in systems subject to irregular vibrations.The second part will strive to extend the approach to systems where data obtained from physical testing is included, and will thus serve as a validation element. The considered systems are a pin-on-disk system and an automotive friction brake. As almost always in validation, the ideal expectation for the outcome is that the approach developed earlier can be transferred to real and larger systems without further complications. However, we expect that the validation work that we propose to conduct here will also lead to new insights into how the approach itself has to be tailored or perhaps modified to reach robust and convincing results. The proposal strives to overcome existing boundaries between the domains of physics-based system modelling, data analysis and time-series analysis, as well as design. Thereby it has a highly visionary and ambitious tone.

该项目的重点是开发一种方法来分析和表征多组件系统中阻尼设计元素和耗散机制的影响和作用，这些系统具有自激，受复杂系统状态和多种负载情况的影响。虽然对于规则动态，即稳态周期响应或线性瞬态，阻尼元件和机制可以用标准技术描述，但对于不规则动态，识别来源在很大程度上是一个未解决的问题 和能量汇，甚至结构中的能量流。此外，大多数技术系统都包含大量局部非线性和阻尼元件，例如系统的接头和接触界面，并承受多种不同的负载情况。这给阻尼装置的评估带来了挑战性。在不规则振动状态下，多种能量汇处于不断的相互作用中。最近，由多种负载情况引起的额外复杂性使得应用简单的自下而上的基于物理的阻尼或耗散描述来评估阻尼装置变得不可能。因此，需要新技术来表征阻尼设计元素。在这种情况下，我们建议开发方法来彻底分析振动响应以及结构、阻尼和负载参数。第一部分将侧重于开发分析和计算方法，用于研究受到不规则振动的摩擦激励系统中的阻尼装置，并且仅限于计算机建模和从数值模型得出的数据。在这种情况下，采用并结合了非线性时间序列分析和多元统计的方法。中心元素是数据矩阵 M，其中填充了多个载荷工况的不同类别的特征量。最终结果是评估和优化受到不规则振动的系统中的阻尼装置和耗散机制的程序。第二部分将努力将该方法扩展到包括从物理测试获得的数据的系统，从而作为验证元素。所考虑的系统是销盘系统和汽车摩擦制动器。正如在验证过程中几乎总是一样，对结果的理想期望是早期开发的方法可以转移到真实的更大的系统中，而不会出现进一步的复杂性。然而，我们期望我们建议在这里进行的验证工作也将带来新的见解，即如何定制或修改方法本身才能达到稳健和令人信服的结果。该提案致力于克服基于物理的系统建模、数据分析和时间序列分析以及设计领域之间的现有界限。因此它具有高度远见和雄心勃勃的基调。