Displacement measurement apparatus for structure

Patent metadata

Field	Value
Publication number	US-12117333-B2
Application number	US-201917437990-A
Country	US
Kind code	B2
Filing date	Mar 26, 2019
Priority date	Mar 26, 2019
Publication date	Oct 15, 2024
Grant date	Oct 15, 2024

Abstract

An apparatus includes an acquisition means for acquiring the displacement quantity in a time-series manner, the displacement quantity being generated at a measurement part of a structure by the weight of a vehicle that travels on the structure, a detection means for detecting the position and the clock time of the vehicle that travels a pre-passage area of the measurement part, an estimation means for estimating the arrival time that the vehicle arrives at the measurement part, from the position of the measurement part and the position and the clock time of the vehicle, and a control means for controlling the acquisition means on the basis of the estimated arrival time.

First claim

What is claimed is:

1. A displacement measurement apparatus for a structure, the apparatus comprising:
a memory storing program instructions; and
a processor coupled to the memory, wherein the processor is configured to execute the program instructions to:
acquire a displacement quantity in a time-series manner, the displacement quantity generated at a measurement part of the structure by weight of a vehicle that travels on the structure;
detect a position and clock time of the vehicle when the vehicle is traveling on a pre-passage area of a measurement part of the structure;
estimate an arrival time when the vehicle will arrive at the measurement part, from a position of the measurement part and the position and the clock time of the vehicle; and
control acquisition of the displacement quantity on a basis of the estimated arrival time, wherein
the acquisition includes acquiring time-series images captured by a camera that images the structure from below, and calculating the displacement quantity by analyzing the acquired time-series images.

2. The displacement measurement apparatus for the structure, according to claim 1 , wherein
detection of the position and the clock time includes detecting the position and the clock time, on a basis of a detection result by a sensor mounted on the vehicle and that detects the position and the clock time of the vehicle.

3. The displacement measurement apparatus for the structure, according to claim 1 , wherein
detection of the position and the clock time includes detecting the position and the clock time, on a basis of a position of a reference point set in the pre-passage area and a detection result by a sensor that detects the clock time when the vehicle passes through the reference point.

4. The displacement measurement apparatus for the structure, according to claim 1 , wherein
detection of the position and the clock time includes detecting the position and the clock time, on a basis of a position of a reference point set in the pre-passage area and an analysis result of an image captured by an imaging device that images the vehicle when the vehicle that passes through the reference point.

5. The displacement measurement apparatus for the structure, according to claim 1 , wherein
estimation of the arrival time includes calculating a period of time necessary for the vehicle to move from the detected position of the vehicle to the position of the measurement part at a vehicle speed set and stored in advance, and calculating the arrival time from the calculated period of time and the detected clock time.

6. The displacement measurement apparatus for the structure, according to claim 1 , wherein
detection of the position and the clock time further includes detecting speed of the vehicle, and
estimation of the arrival time includes calculating a period of time necessary for the vehicle to move from the detected position of the vehicle to the position of the measurement part at the detected vehicle speed, and calculating the arrival time from the calculated period of time and the detected clock time.

7. The displacement measurement apparatus for the structure, according to claim 1 , wherein
detection of the position and the clock time further includes detecting a course of the vehicle, and
estimation of the arrival time includes calculating a period of time necessary for the vehicle to move from the detected position of the vehicle to the position of the measurement part according to the detected course, and calculating the arrival time from the calculated period of time and the detected clock time.

8. The displacement measurement apparatus for the structure, according to claim 1 , wherein
estimation of the arrival time includes calculating the position of the measurement part, on a basis of a detection result by a sensor that detects a capturing direction of the camera that images the measurement part and a detection result by a sensor that detects a position of the camera.

9. The displacement measurement apparatus for the structure, according to claim 1 , wherein
control of the acquisition of the displacement quantity includes allowing the acquisition to be performed during a period from a clock time before the arrival time by a certain period of time to a clock time after the arrival time by the certain period of time.

10. The displacement measurement apparatus for the structure, according to claim 1 , wherein
control of the acquisition of the displacement quantity includes calculating an error in the arrival time, and allowing the acquisition to be performed during a period from a clock time before the arrival time by the error to a clock time after the arrival time by the error.

11. A displacement measurement method for a structure, the method comprising:
acquiring a displacement quantity in a time-series manner, the displacement quantity generated at a measurement part of the structure by weight of a vehicle that travels on the structure;
detecting a position and clock time of the vehicle when the vehicle is traveling on a pre-passage area of a measurement part of the structure;
estimating an arrival time when the vehicle will arrive at the measurement part, from a position of the measurement part and the position and the clock time of the vehicle; and
controlling acquisition of the displacement quantity on a basis of the estimated arrival time, wherein
the acquisition includes acquiring time-series images captured by a camera that images the structure from below, and calculating the displacement quantity by analyzing the acquired time-series images.

12. A non-transitory computer-readable medium storing a program comprising instructions for causing a computer to perform processing comprising:
acquiring a displacement quantity in a time-series manner, the displacement quantity being generated at a measurement part of a structure by weight of a vehicle that travels on the structure;
detecting a position and clock time of the vehicle when the vehicle is traveling on a pre-passage area of a measurement part of the structure;
estimating an arrival time when the vehicle will arrive at the measurement part, from a position of the measurement part and the position and the clock time of the vehicle; and
controlling acquisition of the displacement quantity on a basis of the estimated arrival time, wherein
the acquisition includes acquiring time-series images captured by a camera that images the structure from below, and calculating the displacement quantity by analyzing the acquired time-series images.

13. The displacement measurement apparatus for the structure, according to claim 1 , further comprising
a sensor that measures a position of the camera, wherein
estimation of the arrival time includes performing the estimation by using the position of the camera measured by the sensor as the position of the measurement part.

Assignees

• Nec Corp

Inventors

• Nakano Gaku
• Takada Jun

Classifications

• G08G1/052

  with provision for determining speed or overspeed {(speed measuring in general G01P)} · CPC title

• G06T2207/30252

  Vehicle exterior; Vicinity of vehicle · CPC title

• G06T7/20

  Analysis of motion (motion estimation for coding, decoding, compressing or decompressing digital video signals H04N19/43, H04N19/51) · CPC title

• G01G19/021

  having electrical weight-sensitive devices (G01G19/04 - G01G19/07 take precedence) · CPC title

• G08G1/04

  using optical or ultrasonic detectors · CPC title