Vibration Detection via Cross-Directional Pressure Profiles
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Solution Overview
Problem
Existing vibration measurement systems for fiber web and paper finishing machines are costly and require extensive cabling and customized software, often detecting increased vibrations only after they have become excessive, and do not provide a comprehensive profile for condition monitoring.
Innovation Solution
A method that forms a reference profile of cross-directional force or pressure between machine elements and their counter-pairs under non-vibrating conditions, allowing for the analysis of periodic variations in the measurement signal to detect early signs of vibration, using existing sensor assemblies integrated into the machine elements, and providing visual information for condition monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional vibration measurement systems are installed on bearing houses, then vibration detection is possible, but the system detects vibrations only after they have increased excessively and requires extensive cabling and customized software
Solution Approach 1:
The sensor assembly originally designed for measuring cross-directional profile of force/pressure is made multi-functional by enabling it to also measure vibrations through the same sensor. This eliminates the need for separate vibration sensors and their associated cabling and software infrastructure, directly reducing device complexity while maintaining measurement precision.
Solution Approach 2:
The existing sensor assembly serves its original purpose of measuring cross-directional force/pressure profile while simultaneously detecting vibrations. The system uses its own existing components to perform additional measurement functions without requiring external specialized equipment, thereby simplifying the overall system.
2Reliability
If separate vibration measurement systems are implemented as retrofitting, then vibration monitoring is possible, but it creates extraordinary costs and is separate from the rest of the paper machine automation
Solution Approach 1:
The vibration measurement function is merged with the existing cross-directional profile measurement system. The same sensor assembly and signal processing infrastructure are used for both purposes, integrating vibration monitoring into the existing automation system rather than creating a separate retrofitting system, thereby reducing costs and complexity.
Solution Approach 2:
The sensor assembly and measurement system are designed to perform multiple functions: measuring cross-directional force/pressure profile and detecting vibrations simultaneously. This multi-functionality eliminates the need for separate vibration measurement systems and their associated costs and integration complexities.
3Reliability
If sensor assemblies are installed on rolls as separate rings, then certain vibration problems can be revealed, but it does not provide a full profile for other purposes
Solution Approach 1:
The sensor assembly is designed to simultaneously provide both the cross-directional force/pressure profile measurement and vibration detection capabilities. By making the sensor multi-functional, the system provides complete measurement profiles that serve multiple purposes: process control, vibration monitoring, and diagnostic analysis, thereby enhancing adaptability and versatility.
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 early detection and monitoring of weak vibrations, allowing for informed machine control and damping actions, reducing the need for extensive installation or modification, and utilizing existing measurement arrangements to diversify the purpose of sensor assemblies.
Implementation Method 1
a sensor assembly measuring force or pressure
Implementation Method 2
the cross-directional profile... and the reference profile are analyzed in the method. In the analysis, the profiles are compared with each other in order to detect periodic variation in the cross-directional profile
Data Source
AI summary
A method for monitoring a machine element in a paper finishing machine (10). The machine element mounted for rotation machine elements (16-19) equipped with a sensor assembly (24) measuring force or pressure, and a counter-pair (15, 20, 33, 44) for said machine element. The machine element is made to rotate against the counter-pair, a measurement signal (25) is generated between the machine element and the counter-pair with the sensor assembly, and recording a reference cross-directional profile (21) of force or pressure generated. Condition monitoring (38) of vibration with the reference profile is by comparison of current signals with the reference so as to detect periodic variation (39.1, 39.2) in the cross-directional pressure profile, and producing visual information (37) from the analysis for monitoring. The invention also relates to a corresponding system, a rotating machine element for the method or the system, and a computer program product.