Overhead Line Elasticity Measurement Using Resonant Vibration
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Solution Overview
Problem
Current methods for measuring the elasticity of overhead lines require multiple measurement runs and are not effective in detecting vibrations at high speeds, leading to potential material damage and wear due to interrupted current collection.
Innovation Solution
A non-contacting measuring system that sets the overhead line into defined vibrations using a mechanical excitation device, allowing a single measurement run to derive elasticity from recorded vibration progressions, utilizing sensors like laser light-section sensors or 3D laser scanners to capture high-frequency data and determine mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple measurement runs are used to measure elasticity, then measurement accuracy is improved, but measurement time and productivity deteriorate
Solution Approach 1:
The patent applies mechanical vibration by using a shaker to excite the overhead line at its natural frequency, causing resonance. This vibration-based measurement allows elasticity to be determined from the vibration characteristics (amplitude, frequency, damping) in a single measurement run, eliminating the need for multiple runs while maintaining accuracy. The resonance condition provides a clear, measurable signal that enables precise elasticity calculation from dynamic response.
Solution Approach 2:
The patent uses periodic excitation through harmonic vibration at the natural frequency of the overhead line. The periodic nature of the vibration allows for consistent, repeatable measurements that can be accurately analyzed to determine elasticity. The periodic action creates a stable resonance condition that yields reliable measurement data in a single run.
2Device complexity
If static load measurement is used, then measurement simplicity is improved, but ability to detect high-speed vibrations deteriorates
Solution Approach 1:
The patent transitions from static load measurement to dynamic vibration measurement by applying harmonic excitation through a shaker. This allows the system to detect and measure high-speed vibrations that occur during actual train operation. The vibration-based approach captures the dynamic behavior of the overhead line, including high-frequency oscillations that static measurements cannot detect.
Solution Approach 2:
The patent employs dynamic measurement by exciting the overhead line with harmonic vibration and analyzing its dynamic response. This dynamic approach enables the detection of vibration characteristics at various frequencies, including high-speed vibrations that are critical for assessing overhead line quality during actual train operation at high speeds.
3Reliability
If contact-based measurement is used, then measurement reliability is improved, but material damage and wear increase
Solution Approach 1:
The patent replaces contact-based mechanical measurement with non-contacting optical sensors that measure the vibration amplitude and position of the overhead line. This substitution eliminates direct mechanical contact between the measurement device and the overhead line, thereby preventing material damage and wear while maintaining measurement reliability through optical detection of vibration characteristics.
Solution Approach 2:
The patent introduces an intermediary optical measurement system that indirectly measures overhead line properties by detecting vibration characteristics from a distance. The optical sensor acts as an intermediary, translating mechanical vibration into optical signals without requiring physical contact, thus avoiding wear and damage while preserving measurement accuracy.
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
Enables accurate, high-speed measurement of overhead line elasticity in a single run, identifying potential damage cases and informing targeted maintenance through precise analysis of vibration characteristics, thereby enhancing the quality and reliability of current collection.
Implementation Method 1
The shaker is set up to excite the overhead line at the natural frequency of the overhead line in order to produce a resonance
Implementation Method 2
a shaker for exciting the overhead line at the natural frequency of the overhead line in order to produce a resonance
Implementation Method 3
with the sensor being set up to detect a vibration progression
Data Source
AI summary
A measuring system for measuring the elasticity of an overhead line of a track includes a non-contacting sensor for detecting the position of a measuring point of the overhead line and an evaluation device for calculating the elasticity. A mechanical excitation device sets the overhead line into vibration through active excitation. The sensor is set up to detect a vibration progression and the evaluation device is set up to derive mechanical properties of the overhead line from the vibration progression. The mechanical properties, such as the elasticity of the overhead line, are derived from characteristics of the corresponding vibration curves in the evaluation device. A method for measuring the elasticity of an overhead line of a track and a track construction vehicle are also provided.