US 12,146,737 B2
Bridge displacement calculating apparatus, bridge displacement measuring apparatus, bridge displacement calculating method, bridge displacement measuring method, and non-transitory computer-readable recording medium
Akihiro Tomioka, Tokyo (JP); Takuya Daigo, Tokyo (JP); and Shintaro Ichikawa, Tokyo (JP)
Assigned to Japan Aviation Electronics Industry, Limited, Tokyo (JP)
Appl. No. 17/765,264
Filed by JAPAN AVIATION ELECTRONICS INDUSTRY, LIMITED, Tokyo (JP)
PCT Filed Sep. 2, 2020, PCT No. PCT/JP2020/033255
§ 371(c)(1), (2) Date Mar. 30, 2022,
PCT Pub. No. WO2021/117301, PCT Pub. Date Jun. 17, 2021.
Claims priority of application No. 2019-225364 (JP), filed on Dec. 13, 2019.
Prior Publication US 2022/0364842 A1, Nov. 17, 2022
Int. Cl. G01B 5/30 (2006.01)
CPC G01B 5/30 (2013.01) 12 Claims
OG exemplary drawing
 
1. A bridge displacement calculating apparatus for calculating a displacement of a bridge induced when a vehicle passes, based on acceleration data at a predetermined location of the bridge, comprising:
a DC component removing part for removing DC components of the acceleration data and outputting DC-removed acceleration data;
a high-pass filter part for reducing low frequency components of input data thereto by using, as a cutoff frequency, a reciprocal of a time in which the vehicle has passed between frame bodies of the bridge;
a first integration part for integrating input data thereto, and outputting the integrated input data; and
a second integration part for integrating input data thereto and outputting displacement data, wherein
the high-pass filter part receives the DC-removed acceleration data, the first integration part receives an output of the high-pass filter part, and the second integration part receives an output of the first integration part, or
the first integration part receives the DC-removed acceleration data, the high-pass filter part receives the output of the first integration part, and the second integration part receives the output of the high-pass filter part.