US 11,892,377 B2
Time point acquisition method, time point acquisition device, time point acquisition system, and time point acquisition program
Yoshihiro Kobayashi, Komagane (JP)
Assigned to SEIKO EPSON CORPORATION
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Jun. 29, 2022, as Appl. No. 17/852,583.
Claims priority of application No. 2021-108375 (JP), filed on Jun. 30, 2021.
Prior Publication US 2023/0003611 A1, Jan. 5, 2023
Int. Cl. G01M 5/00 (2006.01)
CPC G01M 5/0066 (2013.01) [G01M 5/0008 (2013.01); G01M 5/0033 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A time point acquisition method for causing a processor to execute a program stored in a memory, the time point acquisition method comprising executing on the processor the steps of:
continuously acquiring acceleration data detected by acceleration sensors, the acceleration sensors being installed at different positions along a superstructure of a bridge, the acceleration data corresponding to movement of a plurality of vehicles at the different positions as the plurality of vehicles move on the superstructure along with a formation moving vehicle;
acquiring time-series data indicating a time change of a displacement of the superstructure based on the continuously acquired acceleration data;
removing a vibration component included in the time-series data;
identifying first data and second data of the time-series data, the first and second data sandwiching a threshold value, the threshold value corresponding to a deflection value generated by a front part of the formation moving vehicle entering onto the superstructure; and
acquiring an entry time point at which the formation moving vehicle enters the superstructure and an exit time point at which the formation moving vehicle exits from the superstructure based on the first and second data after the vibration component is removed therefrom.