Abstract
In this paper, a combination algorithm for diagnosing rotor crack fault is presented. Firstly, the nonlinear output frequency response functions (NOFRFs) are used to analyze the severity of crack damage in the rotor system qualitatively. The NOFRFs are obtained by processing the vibration signal through the nonlinear output frequency response functions. Further analysis of the NOFRFs can determine the crack depth qualitatively. Secondly, the position of the crack is then located using the crack position index (CPI) λ based on the higher harmonic response (HHR) and the dynamic compliance matrix. The simulation and experimental results show that the G2(j2wF) in NOFRFs is very sensitive to crack depth, and the crack position index (CPI) λ can determine the shaft segment effectively where the crack is located. The advantage of this combination algorithm is that it can detect the crack faults by measuring the vibration signal of the cracked rotor at two speeds, which makes the measurement process more simplified and reduces the measurement time for real-time monitoring. At each speed only the vibration response of the two nodes need to be measured, which greatly reduces the number of sensor used in the measurement process and reduces the cost of monitoring. The combination algorithm can diagnose cracked rotor faults effectively and has certain application value in the diagnosis of cracked rotor fault.
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Recommended by Associate Editor Sungsoo Na
Yang Liu is mainly engaged in research work in the fields of mechanical dynamics and control, and has published more than 30 academic papers, including more than 20 articles by SCI and EI. He has presided over 2 projects of the National Natural Science Foundation of China. He is currently a member of the China Rotor Dynamics Professional Committee, an executive director of Vibration Engineering of the Liaoning Province Society, a peer reviewer of the National Natural Science Foundation, and an EI journal reviewer such as the Journal of Mechanical Engineering. He was awarded the honorary title of the first batch of “Top Ten Talents in Science and Technology” in Shenyang and “Excellent Reviewers in Journal of Mechanical Engineering”.
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Liu, Y., Zhao, Y., Han, J. et al. Combination algorithm for cracked rotor fault diagnosis based on NOFRFs and HHR. J Mech Sci Technol 33, 1585–1593 (2019). https://doi.org/10.1007/s12206-019-0310-5
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DOI: https://doi.org/10.1007/s12206-019-0310-5