Rail Track Tamping Correction Using Inertial Survey and Ballast Hardness Feedback
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Solution Overview
Problem
Current methods for correcting individual faults in railroad tracks are not durable and lack objective measurement of quality and durability, often resulting in recurring faults due to uneven ballast conditions and inadequate tamping techniques.
Innovation Solution
A method using inertial or north-based navigation systems to survey rail elevations, determine reference lines, and perform precise tamping with independent control of rail heights, along with trial tamping to assess ballast hardness and condition, allowing for targeted ballast replacement and prediction of durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If electronic smoothing is performed to approximate the actual fault in the track, then the measurement process is simplified, but the measurement precision is reduced
Solution Approach 1:
The patent applies preliminary action by performing trial tamping before the actual correction to measure ballast hardness and determine the number of tamping passes needed. This preliminary measurement and preparation step allows the main correction process to be optimized and executed more precisely, resolving the contradiction between simplified processing and measurement accuracy.
2Manufacturing precision
If tamping is performed without lifting the track, then the intervention threshold is reduced, but settlement occurs under tensile loads causing twisting faults
Solution Approach 1:
The patent applies preliminary anti-action by performing trial tamping to measure ballast hardness before the actual correction. Based on these preliminary measurements, the number of tamping passes is determined in advance to compensate for expected settlement under tensile loads. This preliminary action prevents the development of twisting faults by pre-determining the appropriate intervention threshold and tamping intensity.
Solution Approach 2:
The patent implements feedback by measuring ballast hardness during trial tamping and using this information to determine the number of tamping passes needed for actual correction. This feedback loop ensures that the track geometry remains stable by adjusting the correction process based on real ballast conditions, preventing settlement-induced twisting faults.
3Manufacturing precision
If the beginning and end of tamping are placed exactly on the high point, then the correction is targeted, but abrupt transitions remain between hard and soft areas maintaining high dynamic wheel-rail interaction
Solution Approach 1:
The patent applies local quality by determining the high point with sub-sleefer precision and performing tamping at specific locations relative to the high point based on ballast hardness measurements. Different areas receive differentiated treatment - the high point area gets targeted correction while adjacent areas receive appropriate tamping intensity. This localized, precision-based approach eliminates abrupt transitions between hard and soft areas, reducing dynamic wheel-rail forces while maintaining correction precision.
4Adaptability or versatility
If multiple tamping passes are performed with operator discretion, then the correction can be adjusted, but the ballast condition is not recorded and durability cannot be predicted
Solution Approach 1:
The patent implements feedback by measuring and recording ballast hardness during trial tamping and using this data to determine the optimal number of tamping passes for actual correction. This systematic feedback approach replaces operator discretion with objective measurements, ensuring both adaptability to local conditions and reliability of the correction durability. The recorded ballast conditions provide objective proof of quality and enable durability prediction.
Solution Approach 2:
The patent applies parameter changes by using measured ballast hardness values to determine the number of tamping passes needed. This objective parameter-based approach replaces subjective operator judgment with quantifiable measurements, maintaining flexibility in adapting to different ballast conditions while ensuring reliable and predictable correction durability through systematic recording and analysis of ballast properties.
5Device complexity
If only track geometry is recorded as quality check, then the inspection process is simple, but no information is provided about ballast conditions or durability
Solution Approach 1:
The patent applies multi-functionality by using the tamping machine to perform multiple functions: correcting track geometry, measuring ballast hardness, and recording both types of data. This universal approach eliminates the need for separate measurement systems while providing comprehensive information about both track geometry and ballast conditions, enabling durability prediction without significantly increasing system complexity.
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
This method enhances the durability of track corrections by accurately detecting and addressing individual faults, ensuring long-term stability and quality verification through ballast hardness and compaction force measurements.
Implementation Method 1
compact the ballast by a dynamic vibration of the tamping tines between the opposing tamping tines
Implementation Method 2
Surveying the amplitude- and phase-true non-distorted elevation progression of the left and right rails, the directional error and the superelevation using an inertial measurement system or a north-based navigation measurement system
Implementation Method 3
measure the ballast bed hardness and the compaction force and thus the ballast condition by means of the tamping unit
Data Source
AI summary
The invention relates to a method for the automatic correction of the position of individual faults (H(n)) of a track formed by rails (16) and sleepers (9) with a track tamping machine (2). After the left and right rails have been surveyed independently by means of an inertial measuring unit (11), the length and position of the individual fault (TAMP, S, E) to be corrected is determined by taking into account a limit value of the individual faults (FLIM) and a maximum extension (smax) in the longitudinal direction of the track (s). The tamping units (7) of the tamping machine (s) are positioned exactly at the starting point (S) and end the tamping at the end point (E) of the determined track correction section (TAMP). Both track sections (FLI,FRE) are tamped and corrected simultaneously.