Track Displacement Measurement Using Gyroscope and Acceleration Fusion
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Solution Overview
Problem
Current track displacement measurement technologies face challenges in accurately determining both vertical and lateral displacements of railroad tracks, as they often fail to account for the rotational movements and motion-induced vibrations of railroad cars, leading to incomplete and inaccurate displacement data.
Innovation Solution
A track displacement measurement system that includes a speed sensor, gyroscope sensor, and track relative location measurement unit, which provide motion detection and rotational movement signals to a processing unit. This unit performs integration operations on the motion detection signals and low-pass filtering on rotational movement signals to determine first and second displacements, respectively, and combines these to calculate the overall track displacement, effectively accounting for both high and low-frequency components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If motion detection signals are used to determine track displacement through integration operations, then vertical displacement measurement is achieved, but the influence of railroad car rocking and rotational movement cannot be separated, leading to measurement errors
Solution Approach 1:
The patent segments the measurement signals into two distinct components: motion detection signals (acceleration data) that capture vertical track displacement, and rotational movement detection signals (angular velocity data) that capture car rocking. By processing these segmented signals separately through different calculation methods, the system isolates track displacement from car motion effects, resolving the measurement accuracy problem.
2Measurement precision
If only motion detection signals are processed, then vertical displacement is measured, but rotational movement components contaminate the measurement results
Solution Approach 1:
The patent extracts the rotational movement component from the overall motion signals by using rotational movement detection signals (angular velocity data from gyroscopes). This extracted rotational information is then used to compensate for and remove its contaminating effect from the vertical displacement measurements, isolating the pure track displacement signal from harmful rotational interference.
3Measurement precision
If acceleration sensors are used to correct distance sensor data, then some rocking influence is reduced, but complete separation of track displacement from car motion is not achieved
Solution Approach 1:
The patent merges two independent measurement systems: a distance sensor system for measuring vertical position and a rotational movement detection system (gyroscopes) for measuring angular velocity. By combining these separate measurement streams and processing them through coordinated calculations, the system achieves complete separation of track displacement from car rocking, improving both accuracy and reliability compared to using acceleration sensor correction alone.
Data Source
AI summary
A track displacement measurement device is a track displacement measurement device that measures displacement of the track on which a railroad car runs, and determines first displacement of the track by performing processing including an integration operation based on motion detection signal responsive to motion of the railroad car due to displacement of the track, determines second displacement of the track based on the rotational movement detection signal responsive to rotational movement of the railroad car, and determines combined displacement of the track based on the first displacement and the second displacement.