Articulated Compactor Force Sensing for Accurate Compaction Mapping
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Solution Overview
Problem
Existing compaction systems face inaccuracies in estimating compaction levels and mapping regions with varying densities or stiffnesses due to variations in material properties under different traction units of a compactor, affecting working efficiency.
Innovation Solution
A system and method that utilize a force sensor positioned at an articulated joint of a compactor to measure the force transferred between frames, coupled with a controller to determine compaction levels of different regions using traction units, enabling accurate mapping of compaction states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a machine drive power system measures total power to estimate compaction level, then the compaction level can be estimated, but inaccuracies occur due to varying material densities under different traction units
Solution Approach 1:
The patent divides the compaction measurement system into separate measurement points under each traction unit (front compaction drum and rear pneumatic wheels). By segmenting the measurement function, the system can independently measure compaction levels at different locations, resolving the inaccuracy caused by assuming uniform material density across the entire worksite.
Solution Approach 2:
The patent introduces force sensors as intermediary measurement devices positioned at the articulated joint and under each traction unit. These force sensors act as mediators that directly measure the interaction forces between the compactor and the work surface material, providing accurate compaction data without relying on power consumption estimates that are affected by material variability.
2Adaptability or versatility
If the compactor traverses regions with varying densities, then the compactor can operate on diverse terrains, but the compaction level estimation becomes inaccurate
Solution Approach 1:
The patent implements local quality measurement by placing force sensors at specific locations (articulated joint and under each traction unit) to measure compaction forces locally. This allows the system to adapt to varying terrain densities by measuring the actual local conditions rather than relying on global power consumption estimates, thereby maintaining measurement precision across diverse terrains.
Solution Approach 2:
The patent establishes a feedback mechanism where force sensors continuously monitor the actual forces experienced by each traction unit during operation. This feedback information is used to calculate and adjust compaction level estimates in real-time, enabling the system to adapt to varying material densities and maintain accurate measurements throughout the compaction process.
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 precise determination and mapping of compaction levels and stiffness across a work surface, ensuring uniformity and efficiency in compaction operations.
Implementation Method 1
a force sensor positioned at the articulated joint. The force sensor is configured to measure a force transferred between the first frame and the second frame through the articulated joint
Implementation Method 2
a first traction unit operatively coupled to the first frame and configured to compact the work surface via rolling engagement with the work surface
Implementation Method 3
a second traction unit operatively coupled to the second frame and configured to propel the second frame over the work surface via rolling engagement with the work surface
Data Source
AI summary
A system for determining compaction of a work surface. The system includes a first frame, and a second frame pivotally coupled to the first frame at an articulated joint. The system includes a first traction unit operatively coupled to the first frame and configured to compact the work surface and a second traction unit operatively coupled to the second frame and configured to propel the second frame over the work surface. The system includes a force sensor positioned at the articulated joint and configured to measure a force transferred between the first frame and the second frame. The system includes a controller configured to determine, based on the force, a first compaction level of a first region of the work surface in rolling engagement with the first traction unit and a second compaction level of a second region of the work surface in rolling engagement with the second traction unit.