Railroad Bridge Deflection Measurement Using Vehicle Time Intervals
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Solution Overview
Problem
Existing methods for estimating unknown parameters of a theoretical analysis model for railroad bridge structure performance using inverse analysis are computationally intensive, requiring expensive and high-performance measurement devices, which hinders cost reduction in data communication and system implementation.
Innovation Solution
A measurement method and system that generates displacement data, calculates time intervals, and computes weighting coefficients to correct deflection amounts, allowing for efficient calculation of displacement and deflection responses, thereby reducing the need for high-performance devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If inverse analysis method is used to estimate unknown parameters from acceleration data, then measurement precision is improved, but device complexity and cost increase due to requiring high-performance measurement devices
Solution Approach 1:
The patent replaces expensive high-performance measurement devices with ordinary low-performance measurement devices. The measurement device with ordinary performance is used to acquire acceleration data, and through the simplified calculation method (separating simultaneous action into sequential actions and using time interval calculation), the same parameter estimation accuracy is achieved without requiring high-performance hardware.
2Measurement precision
If all acceleration data is transmitted to host for processing, then measurement precision is improved, but data communication traffic increases
Solution Approach 1:
The patent extracts and processes data locally at the measurement device rather than transmitting all raw acceleration data to the host. The measurement device performs local calculation to generate parameter estimation results, which are then transmitted to the host. This extraction of processing function from the host reduces data communication traffic while maintaining measurement precision.
3Quantity of substance
If measurement device performs local data processing, then data communication traffic is reduced, but calculation amount increases requiring high-performance devices
Solution Approach 1:
The patent segments the calculation process into distinct steps: (1) calculate time interval when each vehicle moves alone on the bridge, (2) calculate deflection amount using approximation formula, (3) calculate weighting coefficient based on displacement and deflection responses, and (4) calculate corrected deflection amount. This segmentation simplifies each individual calculation step, reducing the overall calculation amount and enabling local processing on ordinary measurement devices without requiring high-performance hardware.
Data Source
AI summary
A measurement method includes generating first displacement data based on data of observation points of a structural object, generating observation information, calculating a time interval in which each of vehicles of a moving object moves alone on the structural object, calculating a first deflection amount of the structural object, calculating a displacement response when each of the vehicles moves alone on the structural object based on the first displacement data and the time interval, calculating a deflection response when each of the vehicles moves alone on the structural object based on the first deflection amount and the time interval, calculating weighting coefficients to the respective vehicles based on the displacement response and the deflection response, and calculating a second deflection amount obtained by correcting the first deflection amount based on the weighting coefficients.