US 12,092,551 B2
Structure deflection measurement apparatus
Asuka Ishii, Tokyo (JP)
Assigned to NEC CORPORATION, Tokyo (JP)
Appl. No. 17/435,767
Filed by NEC Corporation, Tokyo (JP)
PCT Filed Mar. 8, 2019, PCT No. PCT/JP2019/009520
§ 371(c)(1), (2) Date Sep. 2, 2021,
PCT Pub. No. WO2020/183549, PCT Pub. Date Sep. 17, 2020.
Prior Publication US 2022/0050009 A1, Feb. 17, 2022
Int. Cl. G01M 5/00 (2006.01); E01D 19/12 (2006.01); G06T 7/00 (2017.01); G06T 7/70 (2017.01); G06V 10/22 (2022.01)
CPC G01M 5/0008 (2013.01) [G01M 5/0041 (2013.01); G06T 7/0002 (2013.01); G06T 7/70 (2017.01); G06V 10/22 (2022.01); E01D 19/125 (2013.01); G06T 2207/30184 (2013.01); G06T 2207/30236 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A structure deflection measurement apparatus comprising:
a memory containing program instructions; and
a processor coupled to the memory, wherein the processor is configured to execute the program instructions to:
acquire a deflection amount caused in a measurement target region on a structure by a vehicle traveling on the structure, at a plurality of timings during a period when the vehicle travels on the structure;
acquire a position of the vehicle on the structure at each of the timings;
generate a pair of the deflection amount and a position of the vehicle at each of the timings;
for the pair at each of the timings, calculate a rigidity coefficient that specifies a relation between a magnitude of a force applied to the structure due to a weight of the vehicle and a flexural rigidity of the structure, from a relation equation and the deflection amount and the position of the vehicle of the pair; and
calculate an average value of the rigidity coefficient calculated for the pair at each of the timings, wherein
the relation equation is established among the position of the vehicle on the structure, the magnitude of the force applied to the structure due to the weight of the vehicle, a position of the measurement target region on the structure, a length of the structure, the flexural rigidity of the structure, and the deflection amount caused in the measurement target region, and
wherein the relation equation is:

OG Complex Work Unit Math
where δ represents the deflection amount, K represents the rigidity coefficient, L represents the length of the structure, x represents the position of the measurement target region, and xw represents the position of the vehicle.