Deflection Basin Detection via Deformation Speed
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Solution Overview
Problem
Traditional methods for detecting deflection basins in highway and airport pavements are inefficient, pose safety hazards, and cannot rapidly measure dynamic deflection, leading to inadequate characterization of pavement bearing capacity and maintenance decisions.
Innovation Solution
A method and apparatus that detect deflection basins based on deformation velocity under a rolling load, using vertical deformation velocities measured at multiple points, with a knowledge base model to correct and calculate accumulative deformation amounts, improving detection efficiency and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional direct measurement methods (Beckman crossbeam, FWD) are used to detect deflection, then measurement can be performed, but measurement efficiency is low, safety hazards arise, and traffic impact is great
Solution Approach 1:
The patent replaces traditional mechanical measurement systems (Beckman crossbeam, FWD) with a laser-based optical measurement system. The laser dynamic deflectometer uses laser beams to measure deflection velocities, eliminating the need for physical contact and mechanical sensors that cause safety hazards and traffic disruption. This substitution enables rapid, safe, and efficient deflection measurement.
Solution Approach 2:
The patent transitions from static deflection measurement to dynamic deflection velocity measurement. By measuring the velocity of deflection changes rather than static displacement, the system captures the dynamic response of pavement under rolling loads, enabling rapid measurement during traffic flow without stopping vehicles, thus improving efficiency and safety.
2Speed
If indirect measurement methods using force-speed-deformation are used, then measurement speed increases, but the bearing performance of structural layers cannot be accurately characterized
Solution Approach 1:
The patent segments the deflection basin into multiple measurement points (first measurement point at load center, second measurement points at other locations). By measuring deflection velocities at these segmented locations simultaneously, the system captures the spatial distribution of pavement response, enabling accurate characterization of structural layer bearing performance while maintaining high measurement speed.
Solution Approach 2:
The patent adds spatial dimension to deflection measurement by measuring at multiple points (load center and other locations) rather than single-point measurement. This multi-point approach provides comprehensive data on deflection basin characteristics, enabling accurate evaluation of bearing capacity while maintaining rapid measurement capability through parallel measurements at different spatial locations.
3Device complexity
If single-point deflection measurement is used, then measurement simplicity is maintained, but the actual bearing capacity of pavement structure cannot be accurately evaluated
Solution Approach 1:
The patent divides the measurement system into multiple independent measurement points within the deflection basin. Each point measures deflection velocity independently, and the combined data provides comprehensive information about pavement bearing capacity. This segmentation maintains measurement simplicity at each point while achieving comprehensive evaluation accuracy through multi-point data integration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables rapid and accurate detection of deflection basins, enhancing the characterization of pavement bearing capacity and reducing environmental and texture-related errors, thus improving maintenance decision-making and safety.
Implementation Method 1
A measurement system using the indirect measurement methods consists of a plurality of Doppler vibrometers
Data Source
AI summary
A method for detecting a deflection basin based on a deformation velocity of a pavement under a rolling load is provided. The method includes: obtaining vertical deformation velocities of the pavement at respective measurement timings corresponding to respective target locations in a target deflection basin during the load movement; obtaining durations for respective response time intervals corresponding to the respective target locations based on the respective measurement timings, the vertical deformation velocities of the pavement at the respective measurement timings and a knowledge base model; obtaining representative vertical deformation velocities of the pavement based on the vertical deformation velocities of the pavement, the durations for respective response time intervals, and the knowledge base model for the vertical deformation velocities of the pavement; and obtaining detection results of the target deflection basin based on the representative vertical deformation velocities of the pavement and the durations for respective response time intervals.