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Modeling and analysis of the dynamics of dry-friction-damped structural systems.

机译：干摩擦阻尼结构系统动力学建模与分析。

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摘要

The benefits of intentional friction damping to reduce the occurrence of wear and premature failure of turbomachinery bladed-disk assemblies are well known and many studies on this topic have focused on the analysis and prediction of the complicated nonlinear forced response exhibited by these structures. In this research, extensions of the recently introduced multi-harmonic Hybrid Frequency-Time method are proposed for the efficient analysis of the response of realistic structures featuring displacement-dependent nonlinearities, such as the friction and impact phenomena that may occur in the presence of friction dampers or when two parts of the same structure periodically contact each other. These theoretical extensions are adapted to the study of large scale, industrial bladed-disk structures that may feature cyclic symmetry or mistuning.;Two analysis techniques are developed for the modeling of displacement-dependent nonlinearities. In the first technique friction dampers are modeled as nonlinear operators representing the contact forces acting on the blades, from the simple case of mono directional friction with constant normal load to the more complex case of three dimensional contact with variable normal load. The analysis of the forced response of several nonlinear systems illustrates the capabilities of this approach as well as the complexity of the typical behavior exhibited by friction damped structures. The second technique introduced helps analyze structures experiencing intermittent contact or friction between two parts or sub-components of the same assembly. This method is applied to the study of the forced response of several simple systems and is used with great efficiency to predict the nonlinear behavior of a beam with a crack. This approach also allows the dampers to be modeled realistically as stand-alone components appended to the bladed disk assembly. In this case the bladed disk assembly as well as the friction dampers are modeled as independent structures that interact at their contacting interfaces. This allows the use of detailed finite element models of dampers rather than having to make simplifying assumptions regarding their geometry. These two methods are applied to the study of the nonlinear forced response a realistic bladed-disk assembly featuring a wedge damper model and a structure-like damper model.
机译：减少涡轮机叶片盘组件的磨损和过早失效的有意摩擦阻尼的好处是众所周知的，并且对此主题的许多研究都集中在对这些结构所表现出的复杂非线性力响应的分析和预测上。在这项研究中，提出了对最近引入的多谐波混合频率-时间方法的扩展，以有效分析具有位移相关非线性的现实结构的响应，例如存在摩擦时可能发生的摩擦和冲击现象阻尼器或相同结构的两个部分周期性地相互接触。这些理论上的扩展适用于研究可能具有循环对称性或不平衡性的大型工业叶片盘结构。；开发了两种分析技术来建模与位移有关的非线性。在第一种技术中，摩擦阻尼器被建模为代表作用在叶片上的接触力的非线性算子，从简单的单向摩擦力和恒定法向载荷的简单情况到更复杂的三维接触力和法向载荷的复杂情况。对几个非线性系统的强制响应的分析说明了这种方法的功能以及摩擦阻尼结构表现出的典型行为的复杂性。引入的第二种技术有助于分析结构，该结构在同一组件的两个零件或子零件之间间歇性地接触或摩擦。该方法被用于研究几个简单系统的强迫响应，并被有效地用于预测带有裂纹的梁的非线性行为。这种方法还允许将阻尼器现实地建模为附加到叶片盘组件上的独立组件。在这种情况下，叶片盘组件以及摩擦阻尼器被建模为在其接触界面处相互作用的独立结构。这允许使用阻尼器的详细有限元模型，而不必简​​化有关其几何形状的假设。这两种方法都用于非线性力响应的研究，以楔形阻尼器模型和类结构阻尼器模型为基础的实际叶片盘组件为研究对象。

著录项

  • 作者

    Poudou, Olivier J.;

  • 作者单位

    University of Michigan.;

  • 授予单位 University of Michigan.;
  • 学科 Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 2007
  • 页码 193 p.
  • 总页数 193
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 机械、仪表工业;
  • 关键词

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