Gearless Printing Press Drive Vibration Compensation
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Solution Overview
Problem
Existing sheet-fed printing presses face challenges in compensating for torsional vibrations, which affect print quality, as current methods require complex and costly modal analysis for harmonic balancing torques.
Innovation Solution
Assigning a device to each drive controller to generate a torsional vibration compensation variable online using state variables from the drive control loop, eliminating the need for modal analysis and allowing for adaptive compensation without spectrally differentiated harmonic balancing moments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If modal analysis is used to compensate for torsional vibrations with harmonic balancing torques, then torsional vibration compensation is achieved, but the process becomes complicated and expensive
Solution Approach 1:
The invention extracts the essential information needed for vibration compensation directly from the drive control loop's state variables, separating the compensation function from the complex modal analysis process. By using only the necessary control-relevant state variables (such as angular velocity, torque, or position from the drive controller), the system obtains vibration compensation data without performing complete modal analysis, thus reducing complexity while maintaining effectiveness
Solution Approach 2:
The drive control loop itself provides the necessary information for vibration compensation through its existing state variables. The system uses the state variables already being monitored and controlled by the drive controller (angular velocity, torque, position) to generate the torsional vibration compensation variable, making the system self-sufficient without requiring external complex analysis equipment or processes
2Reliability
If spectrally differentiated compensation with harmonic balancing moments is applied, then torsional vibration compensation is achieved, but the effort and complexity increase
Solution Approach 1:
The invention changes the parameter basis for vibration compensation from spectrally differentiated harmonic balancing moments to a single comprehensive torsional vibration compensation variable derived from drive control state variables. This parameter transformation simplifies the compensation approach by using directly available control parameters (torque, speed, position) rather than requiring spectral analysis and multiple harmonic components, thereby reducing operational effort while maintaining compensation effectiveness
Data Source
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AI summary
The printing press has printing units (10-13), and main and gearless drives (19, 20). A drive controller is assigned to each drive. The controller generates a control signal for the respective drives based on the difference between target and actual values. A generating device assigned to the controller generates a rotational vibration compensation variable from a condition variable of a drive controller circuit during operation of the press. The controller is integrated into the circuit, where the compensation variable is effective in the circuit for rotational vibration compensation. : An independent claim is also included for a method for operating a printing press. USE : Printing press i.e. sheet-fed printing press. ADVANTAGE : The generating device is assigned to the drive controller, and generates the rotational vibration compensation variable from the condition variable of the drive controller circuit during the operation of the press, where the compensation variable is effective in the circuit for rotational vibration compensation, thus eliminating the need for model analysis of the printing press, and hence realizing rotational vibration compensation in a simple and cost-effective manner. DESCRIPTION OF DRAWINGS : The drawing shows a schematic view of a sheet-fed printing press. 10-13 : Printing units 15 : Transmission cylinder 16 : Inking system 17 : Plate cylinder 19 : Main drive 20 : Gearless drive.