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首页> 外文会议>International Symposium on Stability Control of Rotating Machinery(ISCORMA-4); 20070827-31; Calgary(CA) >Detection of asymmetry in flexible rotating systems from the zeros of system-identified models
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Detection of asymmetry in flexible rotating systems from the zeros of system-identified models

机译：从系统识别模型的零点检测柔性旋转系统中的不对称性

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As the reliability and safety of rotating machinery in operation becomes increasingly important, the identification of dynamic properties of rotors has been drawing increased attention in recent years. Specifically, the rotating asymmetry, which often represents damage in a rotating shaft such as a transverse crack, is known as a critical target parameter for rotor damage identification. Directional frequency response functions (dFRFs) have been known as a powerful tool for detecting the presence and degree of asymmetry in a rotating shaft. However, the magnitude of dFRFs successfully indicates the amount of asymmetry in the system as a whole, but it, alone, is not sufficient to reveal the local information such as the location of damage. In this paper, we propose an efficient and reliable method for the location of asymmetry. It uses change in the zeros of normal dFRFs of the asymmetric rotor compared with those associated with the original isotropic rotor. The key aspect of the method is that the localized transmission zeros (LTZs) of normal dFRFs are sensitive to the local parameter changes in a rotor. To utilize the LTZs of dFRFs, the eigensystem realization algorithm (ERA), which is an efficient time domain method of finding LTZs for closely coupled mode systems, is applied to obtain dFRFs for asymmetric rotor-bearing systems formulated in the complex coordinate system. The effectiveness of the proposed method for detecting the location of rotating asymmetry is demonstrated by numerical examples.
机译：随着旋转机械在运行中的可靠性和安全性变得越来越重要，近年来，对转子动态特性的识别已引起越来越多的关注。具体地，通常表示旋转轴中的损坏（例如横向裂纹）的旋转不对称性是用于识别转子损坏的关键目标参数。定向频率响应函数（dFRF）是一种功能强大的工具，可用于检测旋转轴中的不对称性和程度。但是，dFRF的大小成功地表明了整个系统中的不对称程度，但仅凭其不足以揭示局部信息，例如损坏的位置。在本文中，我们提出了一种有效且可靠的不对称定位方法。与原始的各向同性转子相比，它使用了非对称转子的正常dFRF的零值变化。该方法的关键方面是正常dFRF的局部传输零点（LTZ）对转子中的局部参数变化敏感。为了利用dFRF的LTZ，本征系统实现算法（ERA）是为紧密耦合模式系统找到LTZ的一种有效的时域方法，被用于获得复杂坐标系中公式化的非对称转子轴承系统的dFRF。数值实例证明了所提出的方法检测旋转不对称位置的有效性。

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