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Assembly tightness detection of bolt connections using gray-level images with high-order cumulants

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Abstract

Bolt connections are widely used in aero-engine rotors and gas turbines because of their load-transferring and detachable characteristics. However, bolts are prone to looseness due to the influence of fatigue, shock, and thermal loads, which decreases the reliability of the bolted connection structure. Therefore, detecting the assembly tightness of bolted connections is critical to ensure structural integrity during the assembly phase. A high-order cumulant-gray-level image feature (HOC-GLI) method is proposed to detect the assembly tightness of bolt connections. The core of this new method is to obtain high-order cumulant images of vibration signals to eliminate noise and reserve rich nonlinear information. The amplitude distribution of the third-order cumulant reflects the energy distribution of the vibration signal in 3D images. Then, the third-order cumulant 3D images are converted to 2D gray-level images to extract the texture feature. Finally, the root entropy index of the normalized gray-level cooccurrence matrix (GLCM) based on gray-level images is used to indicate the complexity of image information. Experimental studies on six bolt connection states of the aero-engine rotor are conducted. The relationship between the root entropy index and bolted connection status is obtained to verify the effectiveness of the proposed method for assembly tightness detection in different bolt connection statuses. The result shows that the root entropy index has a decreasing trend with the loosening of the bolts, which can quantitatively detect the assembly tightness of the bolt connection structure.

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Acknowledgments

This research is supported by Shaanxi Provincial Natural Science Basic Research Program (Grant No. 2021JM-169), joint funding from the Equipment Pre-research Department of the Ministry of Education of the People’s Republic of China (Grant No. 6141A02033111) and Youth Talent Promotion Project Shaanxi Association of Science and Technology (Grant No.20170509).

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Correspondence to Xiaoli Zhang.

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XiaoLi Zhang received a Ph.D. degree in mechanical engineering from Xi’an Jiaotong University, Xi’an, China in 2011. Currently, she is an Associate Professor in the Department of Mechanical and Electronic Engineering, School of Construction Machinery, Chang’an University, Xi’an, China. Her research interests include signal processing, deep learning, machinery condition monitoring, and intelligent fault diagnosis.

Yong Xia received a master’s degree in mechanical engineering from the Chang’an University of Xi’an, China in 2022. He is currently an algorithm engineer with TCL Tongli Electronics Co., Ltd., China. His research interests include speech recognition, signal processing, deep learning, and fault diagnosis.

Qiang Yan received a master’s degree in mechanical engineering from the Chang’an University of Xi’an, China in 2019. He is currently a vocational college teacher in Sanmenxia Social Management Vocational College. His research interests include fault diagnosis and signal processing.

Xiao Yong received a bachelor’s degree from Hunan University of Arts and Science, ChangDe, China in 2017. He is currently pursuing a master’s degree with the School of Engineering Machinery, Chang’an University, Xi’an, China. His current research interests include fault diagnosis and signal processing.

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Xia, Y., Zhang, X., Yan, Q. et al. Assembly tightness detection of bolt connections using gray-level images with high-order cumulants. J Mech Sci Technol 37, 4981–4988 (2023). https://doi.org/10.1007/s12206-023-0905-8

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  • DOI: https://doi.org/10.1007/s12206-023-0905-8

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