Vibration of a crankshaft-journal bearing system driven by an electric motor is a coupled phenomenon between hydrodynamic characteristics and magnetic origins through the motor air gap. With the advent of new high-energy magnets together with variable speed motor applications, magnetic sources of vibration are becoming more serious. This article investigates the transient whirl responses of a rotor system with purely hydrodynamic origins and compares it with that of magnetically coupled origins. Results show that magnetically coupled sources significantly affect the vibration of the rotor-motor system.
In the plate mill edge rolling is often used to increase yields by reducing defective end shapes. In this study, the effect of process variables in edge rolling on the plane view pattern of the plate was examined by a physical modelling technique with plasticine model material. The prime consideration was given to obtain information on the shape defects of plate such as overlap, width shortage, crop length, bUlging and buckling with respect to process variables which is difficult to check in detail on the shop floor. The result provided valuable information on optimal edge rolling process in spite of some limitation in physical similarity between plasticine and hot steel. Modellversuche mit Plastilin zum Stauchwalzen in GrobblechstraBen. Das Stauchwalzen in GrobblechstraBen sorgt fOr qualitativ besseres Vorband und tragt so zur Erh5hung des Ausbringens bel, In dieser Arbeit wurde die Wirkung der ProzeBparameter beim Stauchwalzen Ober den gesamten Blechquerschnitt untersucht. Die Modellversuche mit Plastilin als Versuchswerkstoff sollten AufschluB Ober Formfehler mit Hinblick auf die ProzeBparameter geben. Es ist sehr schwer, solche Zusarnrnenhanqe in Betriebsversuchen ausfOhrlich zu OberprOfen. Das Ergebnis Iiefert wertvolle Hinweise fOr eine Optimierung des Stauchwalzprozesses, trotz einiger Grenzen, die durch die physikalische Ahnlichkeit von Plastilin und Stahl bedingt sind.
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