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Lehre an Hochschulen gemeinsam denken. Motivierte Akteure in kreativer Atmosphäre an einen Tisch bringen. Kommunikation auf Augenhöhe. Das ist das Lehrlabor³. Mit diesem Programm wurde erstmals in Bayern ein Format erprobt, in dem über einen Zeitraum von sieben Monaten innovative Lehr- und Lernsettings in rollenübergreifenden Hochschulteams gestaltet wurden. Forschend und zugleich spielerisch entstanden neue Ideen. Insgesamt fünf Hochschulen wurden auf eine Reise mit Ziel „Innovative Lehrentwicklung“ geschickt. Das erste Ergebnis halten Sie in den Händen. Das Lehrlabor³ hat einen ko-kreativen Rahmen für Lehrentwicklung geschaffen und eine Community ins Leben gerufen, die Hochschulgrenzen und Silodenken überwindet und als interdisziplinäre Ideenschmiede neue Impulse für Lehre und Lernen liefert. Auf den folgenden Seiten zeigt Ihnen das Lehrlabor³-Team Ausschnitte dieses Weges. Lassen Sie sich vom Ideenreichtum der Hochschulteams inspirieren und von der Reiselust anstecken.
(Vorw. Frau Prof. Christina Zitzmann)
This paper describes the open loop configuration of the simulation and measurement of a controller hardware and a voice coil actuator for vibration control of a 11 kW motor on steel frame foundation. The paper discusses the phase response regarding damping behavior of the actuator force and identifies approaches for improvements. Further, the paper offers a comparison of measurements as a result of the run up of the motor in open loop and closed loop operation with rubber elements and with steel springs. It is shown that all vibration modes with vertical movement at the motor feet can be reduced. Finally, the paper discusses the change in the system’s natural frequencies due to the replacement of the rubber elements by steel springs.
Preventing vibrations in electrical motors that are mounted on elastic foundations could help to open up operating speed ranges in which it was previously not allowed to operate as a permanent operating point. In the present paper, theoretical and practical aspects of an active vibration control of a two-pole induction motor (11 kW) mounted on a drive system and an elastic steel frame foundation are investigated. In preparation for simulating state space models with more degrees of freedom, a theoretical analysis derived from the existing test bench reduced to a two-mass-oscillator - motor, actuator and foundation - is done, to show which components are essential. Based on this analysis, simulations with a state space model and modified integral control algorithms will be discussed – in open and closed loop. Results of simulations of vibration reduction
due to the control algorithm and disturbance response will be compared to experimental results from the test bench. Additionally, the power consumption of an actuator is analysed.
This paper describes the vibration behaviour of a small (11 kW) two pole induction motor, which is mounted on an elastic steel frame foundation with a special actuator system. This paper presents natural frequencies as a result of experimental model analysis of the whole system – motor, actuator system and steel frame foundation – and compares them to the numerical modal analyses using a finite element model. Additionally, forced vibrations are measured using the actuators as a shaker to de rive the resonance frequencies of the system. The measured natural frequencies by modal analysis, the measured resonance frequencies and the simulated natural fre quencies are compared to each other. Additionally, the necessary electrical power of the electrodynamic actuators is analysed.
This paper describes the analysis of natural and forced vibrations of a two-pole induction motor mounted on an elastic steel frame foundation. A simplified vibration model is derived which can be used for calculating the natural vibrations in the transversal plane of an electrical motor mounted on a soft foundation. The natural vibrations of the motor are calculated using the simplified vibration model as well as a numerical calculation using a finite element model. These calculations are compared to each other and validated by measurements using experimental modal analysis. In addition to the natural frequencies, also forced vibrations are measured while the motor is operated by a converter. The frequency spectrum is analyzed by using FFT, regarding the forced vibrations.
