US 12,385,802 B2
Measurement method, measurement device, measurement system, and measurement program
Yoshihiro Kobayashi, Komagane (JP)
Assigned to SEIKO EPSON CORPORATION, (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Dec. 7, 2022, as Appl. No. 18/076,485.
Claims priority of application No. 2021-199212 (JP), filed on Dec. 8, 2021.
Prior Publication US 2023/0175918 A1, Jun. 8, 2023
Int. Cl. G01M 5/00 (2006.01)
CPC G01M 5/0066 (2013.01) [G01M 5/0008 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A measurement method for causing a processor to execute a program stored in a memory, the measurement method comprising executing on the processor the steps of:
acquiring acceleration data output from an accelerometer that observes an observation point of a superstructure of a bridge when a first vehicle moves on the superstructure, the accelerometer being disposed at the superstructure;
integrating an acceleration of the acceleration data to obtain an integral speed;
calculating a first speed vibration component by performing high-pass filter processing on the integral speed, the first speed vibration component including a first maximum value and a first minimum value;
calculating a first speed amplitude corresponding to a difference between the first maximum and minimum values of the first speed vibration component;
acquiring displacement data output from a displacement meter that observes the observation point when a second vehicle moves on the superstructure, the displacement meter being disposed at the superstructure, the displacement data including a displacement value of the superstructure along a vertical direction, the displacement value including a second maximum value and a second minimum value;
differentiating the displacement value to obtain a speed of the second vehicle;
calculating a second speed vibration component by performing high-pass filter processing on the speed, the second speed vibration component including a third maximum value and a third minimum value;
calculating a first displacement amplitude corresponding to a difference between the second maximum and minimum values of the displacement value;
calculating a second speed amplitude corresponding to a difference between the third maximum and minimum values of the second speed vibration component;
calculating a conversion function using the first displacement amplitude and the second speed amplitude;
estimating a second displacement amplitude of the superstructure based on the first speed amplitude and the conversion function when the first vehicle moves on the superstructure; and
determining an abnormality of the superstructure based on the estimated second displacement amplitude of the superstructure.