Ground Element Insertion Arm Positioning Error Correction
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Solution Overview
Problem
Existing methods for inserting elements into the ground, such as railway track saddles, achieve precise absolute positioning but fail to effectively reduce relative positioning errors, which can lead to unacceptable vibrations, especially when absolute errors of different elements cancel each other out.
Innovation Solution
A method that determines the absolute positioning error of a preceding element and adjusts the insertion arm's guidance for the next element to minimize relative positioning errors by calculating and applying half of the preceding element's absolute error in the same direction, using multiple topographic survey stations to measure and correct the insertion arm's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If automatic guidance based on topographic surveys is used to achieve precise absolute positioning, then absolute positioning error is reduced to within +/- 1 mm, but relative positioning error between consecutive elements can accumulate to unacceptable levels (e.g., 2 mm)
Solution Approach 1:
The system measures the actual position of each inserted element, calculates the absolute positioning error relative to the nominal position, and feeds this error information back to adjust the target position for the next element. This feedback mechanism ensures that relative positioning error is actively controlled rather than allowing it to accumulate independently.
Solution Approach 2:
Before inserting each element, the system pre-calculates the target position by adjusting the nominal position with half of the previous element's absolute error. This preliminary adjustment prevents the relative positioning error from accumulating to unacceptable levels while maintaining the benefits of automatic guidance.
2Area of stationary object
If multiple topographic survey stations are used to cover the entire trajectory, then measurement coverage is improved, but dimensional differences between stations can introduce additional positioning errors
Solution Approach 1:
The system measures the dimensional difference between adjacent topographic survey stations by measuring the same target with both stations and calculating the difference. This measured dimensional difference is then fed back to correct the coordinates of subsequent target positions, compensating for the systematic error introduced by the station transition.
Solution Approach 2:
The system dynamically adjusts the coordinate parameters of target positions based on the measured dimensional differences between stations. By changing the coordinate parameters to account for station-specific systematic errors, the system maintains measurement precision across the entire trajectory despite using multiple stations.
Data Source
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AI summary
The method involves establishing nominal positions to which elements are inserted in a ground with respect to a theoretical path. An absolute positioning error of one element with respect to the nominal position at which the element to be inserted is determined. An insertion arm is automatically guided towards a target position at which another element to be inserted, where the automatic guidance is performed with respect to the determined absolute positioning error. Independent claims are also included for the following: (1) an information recording medium comprising instructions to perform a method for inserting elements (2) a system for inserting elements in a ground along a theoretical path.