Integration of microscopic simulation of frictional contacts and macroscopic system dynamics into models of brake squeal.

摩擦引起的刹车系统振动引起的刹车尖叫声仍然是汽车工业的一个主要问题。刹车尖叫是客户调查中提到最多的问题之一。通常制动系统的开发过程包括耗时的实验，并且大多数计算都是用具有多个自由度的有限元模型来完成的。在开发过程中，噪声模拟还没有达到预测工具的状态。在大多数情况下，在实验中观察到的噪声问题只会在之后的调整模拟中重现。为了提高这些模拟的预测性能，计划进行以下相关研究：开发适用于非均质材料的摩擦力计算程序。该程序是降维方法的基础。由于在摩擦力计算的背景下进行降维，因此可以将这些计算结合在整个系统(混合模型)的动力学仿真中。混合模型的开发和测试是本研究的主要创新之一。进一步发展了一个非线性制动模型，并用不变流形方法研究了其分叉行为。研究了在非线性现象背景下影响自激的主动和被动对策。这包括分析参数、参数激励和垫片的影响。

Friction induced vibrations of brake systems resulting in brake squeal are still a major problem for the automotive industry. Brake squeal is one of the most mentioned problems in customer surveys. The usual development process of brake systems includes time consuming experiments and most of the calculations are done with finite element models having many degrees of freedom. The noise simulations have not reached the state of a predictive tool in the development process. In most cases a noise problem observed in experiments is only reproduced in an adjusted simulation afterwards. To improve the predictive character of these simulations the following interrelated investigations are planned:Development of a calculation procedure for friction forces applicable to heterogeneous materials. The procedure is base of the method of dimension reduction.Due to the dimension reduction in the context of calculation of the friction forces it is possible to combine these calculations in a dynamics simulation of the complete system (hybrid model). The development and testing of hybrid models is one of main innovations of the present investigation.Further development (based on the results of first proposal) of a nonlinear brake model und investigation of its bifurcation behavior using methods of invariant manifolds.Investigations of active and passive counter measures to influence the self-excitation in the context of nonlinear phenomena. This includes the analysis of the influence of parameters, parameter-excitations and shims.