US 12,306,071 B2
Method and system for identifying cavity position of structure based on global search
Longjun Dong, Changsha (CN); Yongchao Chen, Changsha (CN); and Qingchun Hu, Changsha (CN)
Assigned to CENTRAL SOUTH UNIVERSITY, Changsha (CN)
Appl. No. 17/791,533
Filed by CENTRAL SOUTH UNIVERSITY, Changsha (CN)
PCT Filed Mar. 23, 2020, PCT No. PCT/CN2020/080623
§ 371(c)(1), (2) Date Jul. 8, 2022,
PCT Pub. No. WO2021/139006, PCT Pub. Date Jul. 15, 2021.
Claims priority of application No. 202010019166.3 (CN), filed on Jan. 8, 2020.
Prior Publication US 2023/0035322 A1, Feb. 2, 2023
Int. Cl. G01M 5/00 (2006.01)
CPC G01M 5/0066 (2013.01) 9 Claims
OG exemplary drawing
 
1. A method for identifying a cavity position of a structure based on global search, comprising the following steps:
step 1: using a structure requiring cavity position identification as a target area, arranging a plurality of acoustic emission sensors at key positions of the target area, and acquiring an actual travel time of signals between the plurality of acoustic emission sensors on site;
step 2: constructing a plurality of cavity models for the target area; and for each of the plurality of cavity models, tracking shortest paths of a signal propagation between the plurality of acoustic emission sensors when each of the plurality of cavity models exists in the target area, to obtain a theoretical travel time of the signals between the plurality of acoustic emission sensors; and
step 3: respectively calculating deviations between the theoretical travel time and the actual travel time of the signals between the plurality of acoustic emission sensors corresponding to each of the plurality of cavity models, and using a position of a cavity model corresponding to a minimum deviation as an identified cavity position in the target area.