Detection of tower bolt looseness and its influence of wind level Enjun Wu, Hongjun Chen, Weida Liao, Wenfeng Qu, Chong Huo, Zhengzhao Liang, Xiangzhao Huang, Zhenrong Li, Hang Li, Bin He and Tao Yang E3S Web Conf., 261 (2021) 03048 Published online: 21 May 2021 DOI: 10.1051/e3sconf/202126103048