[3] DU Guofeng,KONG Qingzhao,WU Fanghong,et al. An experimental feasibility study of pipeline corrosion pitdetection using a piezoceramic time reversal mirror［J］. Smart Mater Struct,2016,25:037002.

[4] YIN Heyue,WANG Tao,YANG Dan,et al. A smart washer for bolt looseness monitoring based on piezoelectric active sensing method ［J］.Appl Sci,2016,6(11):320.

[7] PETERSON S T, MCLEAN D I, SYMANS M D, et al. Applicationof dynamic system identification to timber beams. I.［J］.Struct Eng, 2001,127:418-425.

[8] HU X,ZHU H,WANG D. A study of concrete slab damage detection based on the electromechanicalimpedance method［J］. Sensors,2014, 14:19897-19909.

[9] CHOI F C,LI J,SAMALI B,et al. Application of modal-baseddamage-detection method to locate andevaluate damage in timber beams［J］. Wood Sci,2007,53:394-400.