Volume 47 Issue 1
Jan.  2021
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TANG Tao, HUA Mingjun, JIANG Xie, et al. Research on Improved damage index for evaluating bolt looseness of flange structures[J]. Journal of Beijing University of Aeronautics and Astronautics, 2021, 47(1): 123-131. doi: 10.13700/j.bh.1001-5965.2019.0649(in Chinese)
Citation: TANG Tao, HUA Mingjun, JIANG Xie, et al. Research on Improved damage index for evaluating bolt looseness of flange structures[J]. Journal of Beijing University of Aeronautics and Astronautics, 2021, 47(1): 123-131. doi: 10.13700/j.bh.1001-5965.2019.0649(in Chinese)

Research on Improved damage index for evaluating bolt looseness of flange structures

doi: 10.13700/j.bh.1001-5965.2019.0649
Funds:

National Natural Science Foundation of China 51975581

More Information
  • Corresponding author: ZHANG Yuxiang, E-mail: yuxiangz@tom.com
  • Received Date: 29 Dec 2019
  • Accepted Date: 02 Mar 2020
  • Publish Date: 20 Jan 2021
  • The method based on the piezoelectric impedance method using statistical parameters as the damage index to evaluate loose bolt has a wide range of applications. However, most of the test objects adopting this method are structures such as plates under laboratory conditions, which are not real structures. Therefore, for real flange structures, whether these damage indexes are still applicable and whether these damage indexes need to be improved need further study. The rules between different damage indexes and loose bolt of flange structure are obtained through experiments:the larger the degree of bolt looseness is and the closer the position is, the larger the values of the Root Mean Square Deviation (RMSD), the Mean Absolute Percent Deviation (MAPD), and the Correlation Coefficient Difference (CCD) are, and Ry/Rx is not suitable to be used as a damage index for evaluating the loose bolt of flange structures because it has not a significant rule. The comparison of results shows that the structural difference affects the first three damage indicators to different degrees, and the improved damage index Root Mean Square of Change Rate (RMSCR) is only related to the position and degree of the loose bolt of flange structures, which is barely affected by the structural difference. Hence, the RMSCR has a crucial practical significance:when any piezoelectric sheet is damaged, it only needs to be replaced with a piezoelectric sheet of the same type without updating the damage index library. Finally, verification experiments verify the correctness of the above results and the applicability of the detection method for loose bolt of flange structure based on RMSCR.

     

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