Compaction Measurement System with Dual Apparatus Calibration
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Solution Overview
Problem
Conventional compaction measurement systems for road surfaces, such as those using rollers, face challenges in accuracy and ease of use, particularly under varying ambient and pavement temperatures, and often require complex calibration processes.
Innovation Solution
A dual-compaction measurement system comprising a stationary apparatus on the roller and a mobile, hand-held apparatus, utilizing acceleration measurements and GNSS positioning to compare and correct compaction values, ensuring higher accuracy and ease of operation by recalibrating the roller system based on precise mobile measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a stationary compaction measurement apparatus is used on the roller, then continuous compaction monitoring is achieved, but measurement accuracy deteriorates under varying temperatures
Solution Approach 1:
The system uses the mobile apparatus to provide feedback measurements that are compared against the stationary apparatus readings. The calculation unit processes this feedback to determine correction values, which are then applied to calibrate the stationary apparatus for accurate compaction measurement under varying temperature conditions.
Solution Approach 2:
The system changes the measurement parameters by using different measurement principles for the two apparatuses. The stationary apparatus uses acceleration measurements during roller operation, while the mobile apparatus uses direct interaction with the subsoil, allowing cross-validation and correction of measurements under varying environmental conditions.
2Measurement precision
If a mobile hand-held measurement apparatus is used, then measurement accuracy improves, but operational complexity increases
Solution Approach 1:
The calculation unit serves as an intermediary that automatically processes data from both apparatuses. It compares the stationary and mobile measurement values, determines correction values, and provides calibrated compaction data, thereby reducing the operational complexity of managing two different measurement systems.
Solution Approach 2:
The system performs self-calibration by automatically comparing measurements from the stationary and mobile apparatuses and generating correction values. This self-service calibration process eliminates the need for manual calibration procedures and reduces the operational burden on the user.
3Reliability
If multiple compaction passes are performed to ensure sufficient compaction, then compaction quality improves, but fuel consumption and machine wear increase
Solution Approach 1:
The real-time compaction monitoring with feedback from both apparatuses allows the operator to see exactly which areas require additional compaction passes. This feedback enables targeted re-passes only where needed, avoiding unnecessary passes over already sufficiently compacted areas, thus reducing fuel consumption and machine wear.
Solution Approach 2:
The system replaces manual visual inspection and guesswork with automated measurement and calculation systems. The calculation unit processes measurement data to provide precise compaction status information, substituting mechanical trial-and-error compaction with data-driven decision-making.
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
The system enhances compaction measurement accuracy, reduces over-compaction, and optimizes fuel consumption and machine wear by providing precise real-time feedback on compaction status, allowing for targeted compaction adjustments.
Implementation Method 1
determine, on the basis of a measured acceleration of a measurement probe of the first compaction measurement apparatus as a result of a measurement vibration
Implementation Method 2
measured acceleration of a measurement probe of the first compaction measurement apparatus as a result of a measurement vibration and/or an acceleration of a compaction element
Implementation Method 3
a first GNSS apparatus coupled to the first compaction measurement apparatus so as to determine positional information of the first compaction measurement apparatus if the first compaction measurement apparatus is positioned at the first position
Data Source
AI summary
A system for compaction measurement includes a first compaction measurement apparatus arrangeable on a compaction machine and configured to determine, on the basis of a measured acceleration of a measurement probe of the first compaction measurement apparatus as a result of a measurement vibration and/or an acceleration of a compaction element of the compaction machine, at least one first stationary compaction value that informs about a local compaction of the subsoil or the surfacing for at least a first position, and to output the same with associated positional information for the first position; a second compaction measurement apparatus being mobile and configured to identify, upon interaction or contact with the subsoil or the surface, the local compaction of the subsoil or the surfacing for at least the first position and to output, on the basis thereof, at least one first mobile compaction value with associated positional information for the first position; and a calculation unit configured to compare the first stationary compaction value and the first mobile compaction value so as to determine a correction value that depends on the deviation of the first stationary compaction value from the first mobile compaction value, or to determine and display a deviation.