| 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) | 
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 
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