Non-Contact Web Tension Detection via Transverse Vibration Analysis
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Solution Overview
Problem
Conventional tension measuring devices in material processing machines are prone to inaccuracies due to external physical influences such as temperature fluctuations, mechanical vibrations, and imbalances, which affect the measurement of material web parameters like tension, speed, and elasticity.
Innovation Solution
A non-contact method using sensors to detect vibration parameters of transverse vibrations in the material web, such as radar, Doppler radar, ultrasonic, or laser sensors, which are insensitive to mechanical influences and allow for accurate determination of web tension and other parameters without wear, enabling precise control of web tension during processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional tension measuring devices are used, then web tension can be measured, but measurement accuracy deteriorates due to external physical influences such as temperature fluctuations, mechanical vibrations, and imbalances
Solution Approach 1:
The patent replaces mechanical contact-based tension measuring devices with a non-contact vibration analysis system. Sensors detect transverse vibrations of the material web without physical contact, eliminating the mechanical connection that causes sensitivity to temperature fluctuations, mechanical vibrations, and imbalances. The system measures vibration parameters (frequency, amplitude, waveform) and calculates web tension from these parameters, achieving immunity to the harmful external factors that affect conventional mechanical sensors.
2Reliability
If mechanical contact-based sensors are used, then web parameters can be detected, but device wear occurs reducing reliability
Solution Approach 1:
The patent replaces mechanical contact-based sensors with non-contact vibration sensors that detect web parameters through vibration analysis. This eliminates physical contact and associated wear mechanisms, allowing the sensing system to operate indefinitely without degradation from friction, adhesion, or mechanical fatigue. The sensors measure vibration characteristics of the web as it passes through the machine, enabling continuous long-term operation without replacement or maintenance.
3Measurement precision
If non-contact vibration sensors are used, then measurement accuracy improves and immunity to external influences is achieved, but device complexity increases
Solution Approach 1:
The patent introduces vibration parameters (frequency, amplitude, waveform characteristics) as an intermediary between the material web and the measurement system. Instead of directly measuring web tension or properties, the system measures how the web responds to transverse vibrations and derives tension information from these vibration characteristics. This intermediary approach enables non-contact measurement with high accuracy while keeping the overall system relatively simple, as standard vibration sensors and signal processing circuits can be used.
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 enhances measurement accuracy and maintains constant web tension, improving product quality and production speed by eliminating the impact of external influences on measurement results.
Implementation Method 1
at least one vibration parameter of at least one transverse vibration occurring on the material web is detected without contact using at least one sensor
Implementation Method 2
radar, Doppler radar, ultrasonic, or laser sensors
Implementation Method 3
Doppler radar
Implementation Method 4
ultrasonic, or laser sensors
Implementation Method 5
radar, Doppler radar, ultrasonic, or laser sensors
Data Source
Figure 1~3
AI summary
The invention relates to a method for detecting parameters of a traversing or circulating material web (6) in a material processing machine (1). According to the invention, at least one oscillation parameter of at least one transverse oscillation which occurs on the material web (6) is detected contactlessly by means of at least one sensor (9), and at least one parameter of the material web (6) which results from said oscillation parameter is determined. Furthermore, the invention relates to a device for detecting parameters of a traversing or circulating material web (6) in a material processing machine (1).