Rolling Wheel Accelerometer for High-Speed Pavement Deformation
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Solution Overview
Problem
Existing methods for determining pavement structural parameters, such as load-bearing capability, are limited by speed constraints and the inability to measure peak deflections directly under rolling wheels, requiring slow and costly processes that do not account for high-speed traffic conditions.
Innovation Solution
A Dynamic Screening Deflectometer (DSD) system utilizing accelerometers positioned at the perimeter of rolling wheels to measure deformation during stationary cycloid periods, allowing for accurate determination of pavement structural parameters like deflection, curvature, and stiffness at various speeds, including high-speed traffic conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional deflectometers (FWD, Benkelman Beam, Curviamètre) are used to measure pavement deflection, then measurement accuracy is maintained, but testing speed is limited to below 20 kmph and peak deflections under rolling wheels cannot be measured
Solution Approach 1:
The patent replaces traditional mechanical deflection measurement systems (Benkelman Beam, FWD) with a sensor-based system using accelerometers and GPS. The accelerometer measures vibration characteristics of the rolling wheel, and GPS provides position data, enabling calculation of deflection parameters at highway speeds without mechanical contact probes that limited previous systems to slow speeds.
Solution Approach 2:
The system transitions from static or slow-moving mechanical measurement to dynamic measurement at rolling speeds. By mounting accelerometers on the rolling wheel itself, the system captures deflection data dynamically during normal traffic speeds, eliminating the speed limitation of traditional slow-speed deflectometers while maintaining measurement capability through vibration analysis.
2Productivity
If slow-speed mechanical deflectometers are used, then peak deflection under loaded wheels can be measured, but the testing process is time-consuming and requires stopped or slow-moving equipment
Solution Approach 1:
The system enables continuous pavement testing while the vehicle is in motion at normal traffic speeds. The accelerometer continuously monitors wheel vibration characteristics, and GPS continuously tracks position, allowing measurements to be taken without stopping or slowing down, thereby maximizing productivity and eliminating time loss associated with traditional stopped-tests.
Solution Approach 2:
The rolling wheel itself serves as the measurement platform by mounting the accelerometer directly on it. The wheel's natural vibration and interaction with the pavement surface provide the measurement signal, eliminating the need for separate slow-speed testing equipment and enabling high-speed self-measuring capability.
3Speed
If laser-based systems (TSD, RWD) are used for high-speed testing, then testing speed can reach traffic speed, but the system complexity and capital cost increase significantly
Solution Approach 1:
The patent uses relatively simple and inexpensive accelerometers and GPS receivers instead of complex and expensive laser-based measurement systems. These solid-state sensors are robust, low-cost components that can operate at highway speeds without the optical complexity, alignment requirements, and high capital costs of laser Doppler or triangulation systems.
Solution Approach 2:
The system replaces complex optical laser measurement systems with simple mechanical vibration sensing using accelerometers. This substitution dramatically reduces system complexity, capital cost, and maintenance requirements while maintaining the capability to measure pavement response at highway speeds through vibration characteristic analysis.
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 cost-effective non-destructive testing of pavements at any speed, providing accurate measurements of structural parameters and distress severity, reducing operational costs and improving assessment efficiency compared to traditional methods.
Implementation Method 1
providing an accelerometer positioned to measure deformation at or near the periphery of a rolling weight
Data Source
Figure 1A~1C
Figure 2~2A
Figure 3~4
AI summary
Deformation of a surface, such as a pavement surface is measured using a rolling weight or wheel carrying one or more accelerometers positioned to measure the deformation occurring at a point on or near the perimeter of the wheel. The weight is rolled over the surface to be measured. The signals developed by the one or more accelerometers during a stationary cycloidal period of the point on the perimeter of the wheel are analysed to provide a measure of surface