scholarly journals Analysis of Sensors for Vibration and Nip Forces Monitoring of Rubber Coated Rollers

2010 ◽  
Vol 24-25 ◽  
pp. 83-88 ◽  
Author(s):  
M.C. Voicu ◽  
Reinhard Schmidt ◽  
B. Lammen ◽  
H.H. Hillbrand ◽  
I. Maniu
Keyword(s):  
Dynamic Behaviour ◽  
State Of The Art ◽  
Measurement Techniques ◽  
Vibration Damping ◽  
Test Rig ◽  
Heating Effects ◽  
Active Vibration Damping ◽  
Circumferential Distribution ◽  
Active Vibration

To improve the efficiency of printing or coating processes for paper products the velocity of the web and the roller width can be increased. However, these measures bring about deformations of the rollers, heating effects and streak print defects due to undesirable oscillations. This paper presents new sensor technologies for measuring the axial and circumferential distribution of contact pressure along the nip. This work is required for further research on active vibration damping of rollers. The sensors are applied underneath the elastomer covering of the rollers and must be applied without affecting mechanical features or causing a fall off in the quality of the product. In the paper different new measurement techniques are evaluated and compared to state-of-the-art technologies considering dynamic behaviour, sensitivity, linearity, applicability and accuracy. The sensors are integrated into a test rig simulating the rollers of a printing or coating machine. The results are presented in detail and an outlook is given on further research towards active vibration damping.

Modale Regelung von Werkzeugmaschinen*/Modal control for machine tools

2019 ◽  
Vol 109 (05) ◽  
pp. 358-364
Author(s):  
C. Peukert ◽  
P. Pöhlmann ◽  
S. Ihlenfeldt ◽  
J. Müller ◽  
M. Merx
Keyword(s):  
Machine Tools ◽  
Vibration Damping ◽  
Modal Control ◽  
Modal Approach ◽  
Active Vibration Damping ◽  
Active Vibration

Vorschubachsen von Werkzeugmaschinen werden oft mit mehreren, parallel wirkenden Antrieben ausgestattet. Auch zusätzliche Aktoren für die aktive Schwingungsdämpfung kommen zunehmend zum Einsatz. Im Beitrag wird die modale Regelung für Werkzeugmaschinen vorgestellt. Sie ermöglicht es, die Eigenformen individuell zu regeln und die angeregten Schwingungen mit allen verfügbaren Aktoren gezielt zu bedämpfen. Es werden Ergebnisse zur modalen Regelung am Beispiel einer Gantry-Anordnung vorgestellt.   Feed axes of machine tools are often equipped with several parallel acting drives. Additional actuators for active vibration damping are also increasingly used. This article introduces the modal control for machine tools. The modal approach enables the eigenmodes to be controlled independently and the excited vibrations to be damped specifically with all available actuators. The results for the modal control of a gantry arrangement are presented as an example.

Active Vibration Damping Using an Inertial, Self-Sensing, Electrodynamic Actuator

2005 ◽  
Author(s):  
Christoph Paulitsch ◽  
Paolo Gardonio ◽  
Stephen J. Elliott
Keyword(s):  
Vibration Amplitude ◽  
Vibration Damping ◽  
Induced Voltage ◽  
Current Feedback ◽  
Control Scheme ◽  
Active Vibration Damping ◽  
Active Vibration ◽  
Voltage Feedback ◽  
And Control ◽  
Inertial Actuator

Self-sensing active vibration damping is advantageous if sensors cannot be placed collocated to actuators or these sensors add too much weight or cost. When self-sensing, electrodynamic actuators are used, damping is directly added to the structure where they are attached without the need of electronic integrators or differentiators that could destabilize the system. Inertial actuators have also the advantage that they do not need to react relative to a fixed ground. In this paper self-sensing control with a shunted resistor, current feedback, induced voltage feedback with and without inductance compensation are investigated in simulations and experiments. Experiments with a lightweight, inertial actuator on a clamped plate show that vibration amplitude is decreased between 6dB and 13dB and control bandwidth is doubled when the appropriate control scheme is used.

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