Detection of a Rotor Crack Using a Harmonic Excitation and Nonlinear Vibration Analysis
Detection of a Rotor Crack Using a Harmonic Excitation and Nonlinear Vibration Analysis
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DOI：
10.1115/1.2346693
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发表时间：
2006-12
期刊：
影响因子：
--
通讯作者：
Y. Ishida;T. Inoue
中科院分区：
文献类型：
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作者：
Y. Ishida;T. Inoue
研究了基于谐波激振力非线性振动诊断的转子裂纹检测方法。首先用分段线性函数来模拟裂纹的开合机理。此外，还采用了另一种便于理论分析的幂级数近似裂纹模型。当采用幂级数函数裂纹模型时，裂纹转子的运动方程具有线性和非线性参数项。本文对裂纹转子施加谐波激振力，对其激振频率进行扫频，研究了裂纹引起的非线性共振。阐明了裂纹引起的各种类型非线性共振的发生，并通过数值和实验阐明了这些共振的类型、共振点和主导频率分量。进一步对这些非线性共振进行了非线性理论分析，阐明了这些非线性共振的振幅取决于转子裂纹的非线性参数特征。这些结果使我们能够在不停止系统的情况下在线检测转子裂纹。
Detection of a rotor crack based on the nonlinear vibration diagnosis using harmonic excitation force is investigated. The open-close mechanism of crack is firstly modeled by a piecewise linear function. In addition, another approximation crack model using a power series function that is convenient for the theoretical analysis is used. When the power series function crack model is used, the equations of motion of a cracked rotor have linear and nonlinear parametric terms. In this paper, a harmonic excitation force is applied to the cracked rotor and its excitation frequency is swept, and the nonlinear resonances due to crack are investigated. The occurrence of various types of nonlinear resonances due to crack are clarified, and types of these resonances, their resonance points, and dominant frequency component of these resonances are clarified numerically and experimentally. Furthermore, nonlinear theoretical analyses are performed for these nonlinear resonances, and it is clarified that the amplitudes of these nonlinear resonances depend on the nonlinear parametric characteristics of rotor crack. These results enable us to detect a rotor crack without stopping the system during on-line operation.