Contact Wire Uplift Measurement Using Angle Sensors
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Solution Overview
Problem
Existing methods for measuring the uplift of electrical contact lines on rail-bound traffic routes are limited by large measurement errors due to neglecting lateral wire offsets, requiring external standards for calibration, and being restricted by topographical conditions, which hinders accurate and efficient measurement.
Innovation Solution
A method using a lift measuring device set up outside the track danger area, equipped with a sensor capable of determining the viewing angle of the contact wire, an inclination sensor, and an adjustable device to align the sensor for precise measurement, allowing for high-resolution uplift recording without needing a reference object or approximations, and enabling measurement of multiple tracks with a single device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the camera is positioned at a safe distance from the track to be outside the danger zone, then the safety is improved, but the measurement precision deteriorates due to reduced resolution and increased distance
Solution Approach 1:
The patent transitions from 2D image analysis to 3D spatial measurement by incorporating angle sensors that measure the viewing angle of the contact wire relative to the camera. This angular measurement in a third dimension enables accurate lift calculation despite the camera's distance from the track, resolving the contradiction between safety distance and measurement precision.
2Device complexity
If the lateral offset of the contact wire is not taken into account, then the device complexity is reduced, but the measurement precision deteriorates due to large measurement errors
Solution Approach 1:
The patent implements feedback by using angle sensors to continuously measure the viewing angle of the contact wire. This angular information feeds back into the calculation system, enabling real-time compensation for lateral offset effects. The system automatically adjusts measurements based on the measured angle, maintaining high precision without adding complex mechanical correction devices.
3Measurement precision
If an external standard is required for calibration, then the measurement system can be calibrated, but the ease of operation deteriorates due to the need to find standardized components at measurement locations
Solution Approach 1:
The patent enables self-service calibration by using the contact wire itself as the reference object. The system calibrates itself by measuring the known geometric relationships of the contact wire structure (such as the distance between clamps or characteristic points) without requiring external calibration standards. This eliminates the need for operators to locate and set up standardized components at each measurement site.
4Device complexity
If approximations are used in the measurement calculation, then the calculation complexity is reduced, but the measurement precision deteriorates due to unnecessary measurement errors
Solution Approach 1:
The patent replaces approximate geometric calculations with precise trigonometric calculations based on measured angles. Instead of using simplified linear relationships that introduce errors, the system uses exact sine and cosine functions to calculate lift from the measured viewing angle and known geometry, eliminating approximation errors while keeping calculations manageable through standardized mathematical functions.
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 approach provides high accuracy and flexibility in measuring uplift, reducing errors and setup time, allowing for mobile and efficient measurement of contact wire uplift across multiple tracks without the need for external calibration or specific topographical conditions.
Implementation Method 1
A sensor for detecting the deflection of the contact wire (A). The sensor used must be able to determine the viewing angle at which the contact wire appears in the lifted and resting position.
Data Source
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AI summary
The invention relates to a method for measuring the lift of overhead contact lines on railway tracks, wherein the measurement is carried out using optical detection. The invention aims to develop a method that allows for mobile use, can be set up and dismantled very quickly, wherein the measuring technology is arranged outside the track and exhibits high measurement accuracy. According to the invention, this is achieved by using a calibrated angle sensor, wherein a lift measuring device is positioned between the contact wire and the track plane using a camera/laser scanner, or a path calculation of the contact wire is performed via the support point geometry, and the correct lift a is determined according to the relationship a = h + m √1 - xd - h