Bridge Axle Load Measurement Using Multi-Point Observation
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Solution Overview
Problem
Existing bridge axle load measurement systems, such as those described in JP-A-2009-237805, fail to accurately calculate the action on each observation point when a vehicle passes, as they do not separate the action from other influences, leading to inaccurate measurements.
Innovation Solution
A measurement method and device that acquire physical quantities from multiple observation points along a bridge and calculate actions on these points using a function that correlates the action on one point with its effect on others, allowing for accurate separation of influences and precise axle load measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a strain gauge is installed on a main girder to measure vehicle weight, then vehicle weight can be measured, but the action on the observation point cannot be calculated separately from other actions when multiple vehicles are present
Solution Approach 1:
The patent divides the bridge structure into multiple observation points (first to N-th observation points) arranged along the width direction. By measuring physical quantities at each separate observation point and calculating actions independently for each point, the system can distinguish and separate the actions caused by different vehicles, even when multiple vehicles are present on the bridge simultaneously.
2Measurement precision
If multiple observation points are used to separate actions, then measurement accuracy improves, but device complexity increases
Solution Approach 1:
The patent employs a single type of observation device (such as strain gauges or acceleration sensors) that can be universally applied at multiple observation points. This multi-functional approach allows the same device to measure physical quantities at different locations, reducing the need for specialized equipment at each point and thereby limiting the increase in device complexity while still achieving separate action calculation.
Data Source
AI summary
A measurement method includes: a physical quantity acquisition step of acquiring, based on observation information obtained by at least one observation device that observes first to N-th observation points of a structure arranged along a second direction intersecting a first direction in which a moving object moves along the structure, physical quantities at the first to N-th observation points; and an action calculation step of calculating actions x1 to xN on the first to N-th observation points based on the acquired physical quantities at the first to N-th observation points, on the assumption that, when a function indicating a correlation between an action xj on a j-th observation point and an action that the action xj has on an i-th observation point is set as yij, an acquired physical quantity at the i-th observation point is equal to a sum of values of functions yi1 to yiN.