Structure Deflection Measurement for Rigidity Coefficient Calculation
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Solution Overview
Problem
Existing methods struggle to accurately determine the relationship between the force applied to a structure by a vehicle and its flexural rigidity based on measured deflection amounts.
Innovation Solution
A structure deflection measurement apparatus that includes a deflection acquiring unit, a vehicle position acquiring unit, and a rigidity coefficient calculating unit, which use a relation equation to calculate the rigidity coefficient specifying the force-magnitude and flexural rigidity relationship from acquired deflection amounts and vehicle positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If deflection amount is measured using existing techniques, then deflection data can be obtained, but the relation between force magnitude and flexural rigidity cannot be determined
Solution Approach 1:
The patent introduces a computer as an intermediary that processes the relationship between deflection amount, vehicle position, and vehicle weight using beam theory equations. The computer calculates the rigidity coefficient by mediating between the measured deflection data and the theoretical force-deflection relationship, thereby recovering the force-rigidity information that would otherwise be lost.
Solution Approach 2:
The patent transforms the measurement approach by changing from directly measuring force to measuring deflection amount and then calculating force characteristics through parameter transformation. By using the relationship δ = (W×L³)/(48×E×I) and its derivatives, the system converts deflection measurements into rigidity coefficient information, enabling determination of the force-rigidity relationship without direct force measurement.
2Ease of operation
If only deflection amount is measured, then measurement simplicity is maintained, but accurate determination of force-magnitude and flexural rigidity relationship is difficult
Solution Approach 1:
The patent applies preliminary action by pre-establishing the theoretical relationship between deflection, force, and rigidity based on beam theory before actual measurement. The system pre-calculates the expected deflection patterns for different vehicle positions and weights, then uses these pre-established models to interpret the measured deflection data and extract accurate force-rigidity relationships.
Solution Approach 2:
The patent replaces direct mechanical force measurement with optical deflection measurement combined with theoretical calculation. Instead of using force sensors or load cells that would complicate the measurement system, the invention uses deflection measurement (which can be obtained optically) and substitutes mechanical measurement with theoretical analysis to determine the force-rigidity relationship.
Data Source
AI summary
An apparatus includes: a deflection acquiring unit that acquires a deflection amount caused in a measurement target region on a structure by a vehicle traveling on the structure; a vehicle position acquiring unit that acquires a position of the vehicle on the structure at time when the deflection amount is acquired; and a rigidity coefficient calculating unit that calculates a rigidity coefficient specifying a relation between a magnitude of a force applied to the structure due to a weight of the vehicle and flexural rigidity of the structure, from a relation equation, the acquired deflection amount, and the detected position of the vehicle. The relation equation is established among a position of the vehicle on the structure, the magnitude of the force, a position of the measurement target region on the structure, a length of the structure, the flexural rigidity, and a deflection amount caused in the measurement target region.