Traffic Surface Height Adjustment Using a Differential Model
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Solution Overview
Problem
Existing methods for adjusting the surface height of traffic areas, such as differential milling, face challenges in areas with limited GNSS signal quality, like urban canyons or tunnels, and require precise millimeter-level height determination, which is cumbersome and requires skilled operation.
Innovation Solution
The method involves using a total station stationed outside the construction machine to determine the X, Y position, and then applying a differential height adjustment model to calculate the target height adjustments, allowing the construction machine to achieve the desired height and cross slope modifications, even in areas with poor GNSS signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If absolute guidance with total station or laser leveling device is used, then millimeter-level height determination accuracy is achieved, but device complexity and operational difficulty increase significantly
Solution Approach 1:
The measurement system is segmented into two independent functions: horizontal position determination (using simple GNSS or total station) and height adjustment calculation (using pre-computed differential model). This separates the complex millimeter-level height measurement requirement from the actual measurement process, reducing device complexity while maintaining accuracy.
Solution Approach 2:
The differential height adjustment model is pre-calculated before the milling operation based on design surface and existing surface data. This preliminary computation stores all necessary height adjustment information, eliminating the need for complex real-time height measurements during operation.
2Measurement precision
If absolute guidance with total station is used, then height accuracy is improved, but the requirement for skilled operation and instrument movement increases
Solution Approach 1:
The differential model is pre-calculated with all height adjustment information stored, eliminating the need for skilled operators to perform complex real-time measurements and calculations during the milling operation.
Solution Approach 2:
Instead of performing complex real-time height measurements, the system uses pre-computed height adjustment data from the differential model, copying the necessary information in advance to simplify operational requirements.
3Device complexity
If differential milling with GNSS receiver is used, then device complexity is reduced, but reliability deteriorates in areas with limited GNSS signal quality
Solution Approach 1:
The system uses a multi-functional approach where the total station serves both as a horizontal position determination device and, through the differential model, as the basis for height adjustment. This universal system works reliably in both open areas (with GNSS) and urban canyons/tunnels (with total station only).
Solution Approach 2:
The differential height adjustment model acts as an intermediary that translates simple horizontal position data (from GNSS or total station) into precise height adjustment commands, enabling reliable operation regardless of signal conditions.
4Manufacturing precision
If precise millimeter-level height determination is required, then manufacturing precision is improved, but ease of operation deteriorates
Solution Approach 1:
All complex calculations for achieving millimeter-level precision are performed in advance when creating the differential height adjustment model. During operation, the system simply reads pre-computed values, maintaining high precision while greatly simplifying operational complexity.
Data Source
AI summary
The method of differential height modification of the surface of the traffic area, in which the surface of the traffic area before modification is measured and a digital model of the surface of the traffic area before modification is calculated. The design of the target surface of traffic area after modification is determined. The differential model of the height adjustments is calculated from the differences in the heights of these surfaces. During modification, the X, Y position of the right and left working part of the working tool of the construction machine is then determined, which creates a new surface by modifying, and the appropriate target height adjustment Ft (X, Y) from the unmodified surface of the traffic area is determined from the differential model of the height adjustments. This information is transmitted to the control computer of the construction machine, which makes the necessary adjustments to the construction machine to achieve the desired height and cross slope of the modification. To determine the X, Y position of the right and left working part of the working tool, data from a total station arranged stationary outside the construction machine is used and then the height of the adjustments Ft (X, Y) is determined from the differential model of the height adjustments. A device for carrying out such a method is further described.