Active Vibration Compensation in Print Substrate Machines
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Solution Overview
Problem
Active vibration compensation in printing material processing machines can lead to an unexpected increase or intensification of vibrations at certain measuring points, degrading processing quality, especially print quality, due to unfavorable parameter combinations and restricted selection of counter-torque introduction points.
Innovation Solution
A method that compares the ratio of uncompensated vibration amplitude to counter-torque amplitude with a threshold value, switching between two operational modes for counter-torque determination based on this comparison, ensuring complete oscillation compensation with minimal machine dynamics intervention, and only activating compensation when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If active vibration compensation is applied with certain parameter combinations, then vibration reduction at the compensation target is improved, but vibration amplification at other measuring points occurs
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the counter-torque parameters (amplitude and phase) based on the measured transfer behavior. The control device modifies the compensation parameters according to the ratio between uncompensated vibration amplitude and counter-torque amplitude, ensuring effective vibration reduction without causing amplification at other points.
Solution Approach 2:
The patent implements feedback by measuring the transfer behavior of the machine and using this information to adjust the counter-torque. The control device continuously monitors the vibration characteristics and adapts the compensation parameters based on the measured ratio, creating a closed-loop system that prevents vibration amplification while maintaining reduction at the target.
2Manufacturing precision
If counter-torque is introduced at restricted positions, then complete compensation at the target can be achieved, but freedom in selecting optimal compensation parameters is reduced
Solution Approach 1:
The patent applies dynamics by making the counter-torque parameters dynamic rather than fixed. The control device adjusts the amplitude and phase of the counter-torque based on real-time measurements of the machine's transfer behavior, allowing the system to adapt to different operating conditions and maintain optimal compensation despite restricted introduction positions.
Solution Approach 2:
The patent changes parameters dynamically by adjusting the counter-torque characteristics based on the measured ratio between vibration amplitude and counter-torque amplitude. This allows the system to achieve complete compensation at the target while adapting to the constraints of fixed introduction positions through parameter optimization.
3Manufacturing precision
If counter-torque amplitude is increased for complete compensation, then vibration reduction at target is improved, but unwanted vibration amplification in the machine increases
Solution Approach 1:
The patent uses feedback by measuring the transfer behavior and adjusting the counter-torque amplitude based on the measured ratio. The control device increases or decreases the counter-torque amplitude according to the actual machine response, preventing unwanted amplification while achieving complete compensation at the target through adaptive parameter adjustment.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the counter-torque amplitude and phase based on the measured transfer behavior. The system modifies these parameters according to the ratio between uncompensated vibration and counter-torque, ensuring complete compensation without causing harmful amplification in other parts of the machine.
Data Source
Figure 1~2
Figure 3a~3c
AI summary
A method for the active compensation of vibrations in a printing material processing machine (1) is described, in which at least one signal containing a vibration of the machine or a part of the machine is measured, and at least one counter-torque (13) is introduced into the machine (1) to reduce the vibration. At least one measure of the ratio between the amplitude of the uncompensated vibration and the amplitude of the counter-torque (13) necessary for complete compensation is compared with a threshold value (15), and the counter-torque (13) to be introduced is determined in a first functional relationship with the vibration if the measure is greater than the threshold value (15), and the counter-torque (13) to be introduced is determined in a second functional relationship with the vibration, which differs from the first functional relationship, if the measure is less than the threshold value (15).In a printing material processing machine (1) a control device can be operated in a first operating mode if the measure for the ratio between the amplitude of the uncompensated oscillation and the amplitude of the counter-torque (13) necessary for complete compensation is greater than the threshold value (15), and can be operated in a second operating mode if the measure is less than the threshold value (15).