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首页> 外文会议>ASME turbo expo: turbine technical conference and exposition >IDENTIFICATION OF CONTACT AREA FROM FULL FIELD DISPLACEMENT SURFACE MEASUREMENTS
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IDENTIFICATION OF CONTACT AREA FROM FULL FIELD DISPLACEMENT SURFACE MEASUREMENTS

机译：从全场位移表面测量中确定接触区域

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摘要

One of the most common failure modes for turbomachinery wheels is associated to high-cycle fatigue of blades. A practical way to extend working life is obtained through the introduction of specific devices that allow a reduction in vibrational magnitudes during resonance. Different kinds of components are used such as shrouds and wires for power industries and under platform dampers for aeronautics. The dry friction phenomenon between those devices and the blades induces nonlinear behaviors and flatten associated frequency response functions. This phenomenon is now well known and different modeling techniques of contact are available within numerical simulation softwares. Nevertheless, it is always difficult to estimate or to measure with sufficient precision the actual contact characteristics needed to run those softwares. Due to practical experimental capabilities, measurements are only possible quite far from the contact zone and major quantities such as the transverse loading for example are often unreachable directly. In this paper, a new inverse methodology is presented. This method uses surface displacement measurements (obtained usually experimentally from conventional accelerometer and fast camera) in order to identify the characteristics of contact zones within elastic body assemblies. The new methodology is validated and illustrated by a numerical approach based on an academic set up.
机译：涡轮机械车轮最常见的故障模式之一与叶片的高周疲劳有关。通过引入允许减小共振期间的振动幅度的特定装置，可以获得延长工作寿命的实用方法。使用了不同种类的组件，例如用于电力行业的护罩和电线以及用于航空业的平台下阻尼器。这些设备与叶片之间的干摩擦现象会引起非线性行为，并使相关的频率响应函数展平。现在，这种现象已众​​所周知，数值模拟软件中提供了不同的接触建模技术。然而，始终难以估计或以足够的精度测量运行这些软件所需的实际接触特性。由于具有实际的实验能力，只能在距接触区域很远的地方进行测量，例如通常无法直接获得大量（例如横向载荷）。在本文中，提出了一种新的逆方法。此方法使用表面位移测量（通常通过常规加速度计和快速相机从实验中获得），以识别弹性体组件内接触区域的特征。该新方法已通过基于学术机构的数值方法进行了验证和说明。

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