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Multicrack Localization in Rotors Based on Proper Orthogonal Decomposition Using Fractal Dimension and Gapped Smoothing Method

机译:基于双层正交分解的转子多堆定位,分形尺寸和盖仔平滑方法

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摘要

Multicrack localization in operating rotor systems is still a challenge today. Focusing on this challenge, a new approach based on proper orthogonal decomposition (POD) is proposed for multicrack localization in rotors. A two-disc rotor-bearing system with breathing cracks is established by the finite element method and simulated sensors are distributed along the rotor to obtain the steady-state transverse responses required by POD. Based on the discontinuities introduced in the proper orthogonal modes (POMs) at the locations of cracks, the characteristic POM (CPOM), which is sensitive to crack locations and robust to noise, is selected for cracks localization. Instead of using the CPOM directly, due to its difficulty to localize incipient cracks, damage indexes using fractal dimension (FD) and gapped smoothing method (GSM) are adopted, in order to extract the locations more efficiently. The method proposed in this work is validated to be effective for multicrack localization in rotors by numerical experiments on rotors in different crack configuration cases considering the effects of noise. In addition, the feasibility of using fewer sensors is also investigated.
机译:操作转子系统中的多架定位仍然是今天的挑战。专注于这一挑战,提出了一种基于适当的正交分解(POD)的新方法,用于转子中的多架子定位。通过有限元方法建立具有呼吸裂缝的双盘转子轴承系统,并且模拟传感器沿转子分布,以获得POD所需的稳态横向响应。基于在裂缝位置的适当正交模式(POMS)中引入的不连续性,选择了对裂缝位置敏感的特征POM(CPOM)和抗噪声,用于裂缝定位。由于其难以定位初期爆裂裂缝,因此采用了使用分形尺寸(FD)和螺纹平滑方法(GSM)的损伤指数来使用CPOM直接使用CPOM,以更有效地提取位置。在考虑噪声影响的不同裂缝配置箱中的转子上的数值实验,验证了在该工作中提出的方法是有效的转子中的多架子定位。此外,还研究了使用较少传感器的可行性。

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