Acceleration Waveform Matching for Rail Vehicle Position Identification
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for identifying vehicle position based on axle rotation speed in sections where curvature data collation is difficult result in inaccurate position identification due to errors in distance per rotation and wheel slippage.
Innovation Solution
An acceleration monitoring device that acquires and nonlinearly expands/contracts acceleration waveforms to match with reference waveforms, allowing accurate position identification using translational acceleration data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If position is identified based on axle rotation speed in sections where curvature data collation is difficult, then position identification can be performed in all track sections, but position identification accuracy deteriorates due to errors in distance per rotation and wheel slippage
Solution Approach 1:
The patent introduces acceleration waveform data as an intermediary for position identification. Instead of directly using axle rotation speed in difficult sections, the system uses acceleration waveforms measured by the accelerometer as a mediator to identify position through waveform matching with reference waveforms, thereby avoiding the accuracy problems of direct rotation speed integration while maintaining coverage in all track sections
Solution Approach 2:
The patent changes the parameter used for position identification from axle rotation speed to acceleration waveform characteristics. By transforming the measurement parameter from rotational data to translational acceleration data, the system achieves accurate position identification in sections where curvature data collation is difficult, as acceleration waveforms are not affected by wheel slippage or distance per rotation errors
2Measurement precision
If position is identified based on curvature data collation, then position identification accuracy is improved in sections where curvature data is available, but position identification becomes impossible in sections where curvature data cannot be collated
Solution Approach 1:
The patent makes the acceleration waveform-based position identification method universal and applicable to all track sections regardless of curvature data availability. The acceleration sensor can operate in both straight sections and curved sections, providing a multi-functional solution that works wherever the sensor can detect acceleration, thereby achieving universal position identification coverage
Solution Approach 2:
The patent substitutes the mechanical/kinematic-based position identification method (axle rotation speed integration) with an acceleration-based method. By replacing the mechanical integration approach with acceleration waveform analysis, the system overcomes the limitations of curvature data collation and achieves position identification in all sections including those with zero curvature
Data Source
AI summary
An acceleration monitoring device that comprises: an acquisition unit that acquires measured acceleration waveforms, being acceleration waveforms measured by a vehicle that is traveling a trajectory; a storage unit that stores a reference acceleration waveform, being an acceleration waveform that serves as a reference for measured acceleration waveforms for a predetermined area of interest that is part of the trajectory; and a monitoring unit that monitors the acceleration values for non-linear expanded/contracted and measured acceleration waveforms, being acceleration waveforms made to correspond to the reference acceleration waveform by non-linearly expanding and contracting the time axis for measured acceleration waveforms.