Compaction Estimation via Motor Current and Slope Angle
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Solution Overview
Problem
Existing compaction quality assurance methods for asphalt and earthen materials are inefficient and costly due to their inability to detect inadequate compaction in large areas and require significant downtime for testing, particularly when using electric drive systems.
Innovation Solution
The method involves creating empirically derived compaction lookup tables based on total drive motor current and slope angle for different machine types, allowing for real-time estimation of material compaction and activation of indicators when compaction thresholds are exceeded, using sensors and processors to determine compaction values and display them on a map.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional quality assurance compaction tests (walk out tests, penetrometer tests, nuclear density measurements) are performed, then compaction quality can be verified, but only a small portion of the compacted area is checked and significant downtime occurs
Solution Approach 1:
The system continuously monitors compaction quality during the compaction process itself, rather than performing discrete tests after compaction. The sensor array continuously measures compaction parameters as the compactor moves across the material, eliminating idle testing time and maintaining continuous productive operation.
Solution Approach 2:
Traditional mechanical testing methods (penetrometers, nuclear density measurements) are replaced with an electrical/electronic sensing system that uses sensors to detect compaction quality. This substitution enables faster, non-contact measurement that does not require stopping the compaction process.
2Measurement precision
If traditional quality assurance tests are performed at various locations, then compaction quality can be assessed, but inadequate compaction in one area can go undetected after testing at another location
Solution Approach 1:
The compaction area is divided into multiple zones monitored by an array of sensors distributed across the working area. Each sensor independently monitors its local zone, ensuring complete coverage without gaps. This segmented approach allows comprehensive monitoring of the entire compacted area simultaneously.
Solution Approach 2:
The sensor array system serves multiple functions: it monitors compaction quality across the entire area, identifies specific problem zones, tracks compaction progress over time, and provides real-time feedback. This multi-functional system replaces multiple separate testing operations with a single comprehensive monitoring solution.
3Productivity
If on-board compaction monitoring systems are implemented, then real-time compaction quality determination is possible, but device complexity increases
Solution Approach 1:
The compactor system monitors its own performance and the compaction quality it produces. The sensors are integrated into the compactor itself, and the system automatically processes the data to determine compaction quality, eliminating the need for separate testing equipment and operators.
Solution Approach 2:
The system monitors changes in physical parameters (such as vibration characteristics, force, or electrical properties) that correlate with compaction quality. By tracking parameter changes rather than requiring complex direct measurements, the system achieves accurate monitoring with relatively simple sensors and processing.
Data Source
AI summary
A method for estimating material compaction can include creating compaction lookup tables based on total drive motor current and slope angle for each of a plurality of machine types. The method can include receiving telematics data related to total drive motor current for an individual machine and receiving telematics data related to a slope angle for the individual machine. The method can further include receiving a machine type of the individual machine and selecting a compaction lookup table corresponding to the individual machine type. A compaction value is determined from the selected lookup table based on the total drive motor current and the slope angle.