Modelling of vibro-acoustic systems with polymorphic uncertainties and its application to tyre road noise

具有多态不确定性的振动声学系统建模及其在轮胎道路噪声中的应用

• 批准号: 312761868
• 负责人: Professor Dr.-Ing. Otto von Estorff
• 金额: --
• 依托单位: Institut für Modellierung und Berechnung
• 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/312761868?language=en
• 关键词: Modelling; vibro; acoustic; systems; polymorphic

The acoustic quality of products gains an increasing importance in everyday life. Unfortunately, rather similar looking products of the same manufacturing process tend to show a high variation of their acoustic properties, which is based on geometry deviations or varying material parameters. Therefore, a confidence interval instead of one deterministic solution needs to be determined in order to allow for an early optimisation in the development of new vibro-acoustic systems. Doing so, it should be noticed that different characteristics of uncertainty may occur, namely variability, imprecision, and incompleteness. Consequently, an incorporation of just one characteristic is unrewarding. Instead, the polymorphic uncertainties of the quantities need to be handled, which is the general objective of this proposal. A representative technical example, strongly depending on the behaviour mentioned before, is tyre road noise. Therefore, this problem has been chosen to demonstrate the design process taking into account polymorphic uncertainties. Up to now, only deterministic numerical computations have been developed to predict tyre road noise, by other researchers as well as by the applicant. In a close collaboration between the latter one and the Chalmers University, Gothenburg, particularly in the project Leiser Straßenverkehr 3 (supported by BMWi), a very efficient and precise model for analysing the structural behaviour of tyres and their related sound emission could be developed. Within the current proposal this combined - but so far deterministic - numerical model shall be extended in order to introduce the polymorphic uncertainties to tyre road noise simulations. The treatment of multiphysical results, which rely on polymorphic uncertainties, has to be incorporated in the new model. The planned optimisation with respect to significant output parameters, such as the radiated noise and the rolling resistance, requires highly efficient numerical methods as well as a reduction of the problem dimension. Hence, the Fast Multipole Boundary Element Method is used for the sound radiation, while a Waveguide Finite Element Method is employed to represent the structural model. Although these two methods are very efficient already, a further reduction of the computational effort shall be established by a new metamodel, which promises an efficient way to handle the rather complex multi-objective optimisation also planned in the current proposal.

产品的声学质量在日常生活中变得越来越重要。不幸的是，相同制造过程的相似产品往往会显示出其声学特性的高度变化，这是基于几何偏差或不同的材料参数。因此，需要确定一个置信区间，而不是一个确定性的解决方案，以便在开发新的振声系统时进行早期优化。这样做时，应该注意到不确定性的不同特征可能会出现，即可变性、不精确性和不完整性。因此，只结合一个特征是没有回报的。相反，需要处理数量的多态不确定性，这是本建议的总体目标。一个有代表性的技术例子是轮胎噪声，这在很大程度上取决于前面提到的行为。因此，选择这个问题来演示考虑多态不确定性的设计过程。到目前为止，只有确定性的数值计算已经发展到预测轮胎道路噪声，由其他研究人员和申请人。在后者与哥德堡查尔姆斯大学的密切合作中，特别是在Leiser Straßenverkehr 3项目（由BMWi支持）中，可以开发出一种非常有效和精确的模型，用于分析轮胎的结构行为及其相关的声排放。在目前的建议中，这种组合-但迄今为止是确定性的-数值模型应该得到扩展，以便将多态不确定性引入轮胎道路噪声模拟。对依赖于多态不确定性的多物理结果的处理必须纳入新模型。对于重要的输出参数（如辐射噪声和滚动阻力），规划的优化需要高效的数值方法以及问题维数的减少。因此，声辐射采用快速多极边界元法，结构模型采用波导有限元法。虽然这两种方法已经非常有效，但需要建立一个新的元模型来进一步减少计算量，该元模型保证了处理当前提案中计划的相当复杂的多目标优化的有效方法。