Nip Press Roll Sensor Array for Rotational Variability Cancellation
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Solution Overview
Problem
Existing nip presses struggle to accurately measure and compensate for rotational variability in the pressure profile of covered rolls, leading to inaccurate pressure readings and potential quality issues in paper production due to the dynamic effects of high-speed rotation.
Innovation Solution
The implementation of multiple sensors circumferentially spaced along the sensing roll to measure and average pressure readings at each cross-directional position, canceling out rotational variability effects and providing a more accurate representation of the nip pressure profile, including the use of strategically placed sensors to account for cover wear and roll balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple sensors are used to measure pressure at different circumferential positions, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The sensing roll is divided into multiple sensor arrays, each measuring pressure at different circumferential positions. By segmenting the measurement function across multiple sensors, the system captures rotational variability at different points around the roll circumference, enabling more accurate reconstruction of the true nip pressure profile through data processing.
2Reliability
If sensors are spaced circumferentially to cancel rotational variability, then reliability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The system uses data from multiple circumferentially spaced sensors to detect rotational variability patterns. By analyzing the feedback from these distributed measurements, the system can identify and compensate for rotational effects through signal processing, improving measurement consistency without requiring extremely tight mechanical tolerances on sensor placement.
Data Source
AI summary
Multiple groups of sensors are circumferentially spaced apart at each cross-directional position along a sensing roll of a nip press to measure and cancel or nearly cancel the effects of rotational variability which may be acting on the sensing roll. The strategically-placed sensors are designed to measure the pressure being placed against the web that is being advanced through the nip press. The average of the measurements of multiple sensors spaced circumferential apart provides a good cancellation of any rotational variability that might be found at a cross-directional position on the sensing roll. In this manner, a more true measurement of the nip pressure profile can be obtained and better adjustments made to reduce nip pressure profile variability. In addition, the nip variability profile may be used as a predictor of cover or bearing failures, resonant frequencies and other roll anomalies.