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Exploiting gyroscopic effects for resonance elimination of an elastic rotor utilizing only one piezo actuator

Jens Jungblut Daniel Franz Christian Fischer Stephan Rinderknecht
Bulletin of the Polish Academy of Sciences Technical Sciences | 2023 | 71 | 6 | e147060 | DOI: 10.24425/bpasts.2023.147060
Keywords active vibration control piezoelectric bearing gyroscopic effects active damping
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Abstract

A gyroscopic rotor exposed to unbalance and internal damping is controlled with an active piezoelectrical bearing in this paper. The used rotor test-rig is modelled using an FEM approach. The present gyroscopic effects are then used to derive a control strategy which only requires a single piezo actuator, while regular active piezoelectric bearings require two. Using only one actuator generates an excitation which contains an equal amount of forward and backward whirl vibrations. Both parts are differently amplified by the rotor system due to gyroscopic effects, which cause speed-dependent different eigenfrequencies for forward and backward whirl resonances. This facilitates eliminating resonances and stabilize the rotor system with only one actuator but requires two sensors. The control approach is validated with experiments on a rotor test-rig and compared to a control which uses both actuators.
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Authors and Affiliations

Jens Jungblut
1
ORCID: ORCID
Daniel Franz
1
Christian Fischer
1
ORCID: ORCID
Stephan Rinderknecht
1
ORCID: ORCID
  1. Institute for Mechatronic Systems, Technical University Darmstadt, 64287, Germany

Simulative investigation of rubber damper elements for planetary touch-down bearings

Benedikt Schüßler Timo Hopf Stephan Rinderknecht
Bulletin of the Polish Academy of Sciences Technical Sciences | 2021 | 69 | 6 | e139615 | DOI: 10.24425/bpasts.2021.139615
Keywords touch-down bearing flywheel drop-down simulation rubber
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Abstract

Designing touch-down bearings (TDB) for outer rotor flywheels operated under high vacuum conditions constitutes a challenging task. Due to their large diameters, conventional TDB cannot suited well, and a planetary design is applied, consisting of a number of small rolling elements distributed around the stator. Since the amplitude of the peak loads during a drop-down lies close to the static load rating of the bearings, it is expected that their service life can be increased by reducing the maximum forces. Therefore, this paper investigates the influence of elastomer rings around the outer rings in the TDB using simulations. For this purpose, the structure and the models used for contact force calculation in the ANEAS simulation software are presented, especially the modelling of the elastomers. Based on the requirements for a TDB in a flywheel application, three different elastomers (FKM, VMQ, EPDM) are selected for the investigation. The results of the simulations show that stiffness and the type of material strongly influence the maximum force. The best results are obtained using FKM, leading to a reduction of the force amplitude in a wide stiffness range.
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Bibliography

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Authors and Affiliations

Benedikt Schüßler
1
ORCID: ORCID
Timo Hopf
1
ORCID: ORCID
Stephan Rinderknecht
1
ORCID: ORCID
  1. Technical University of Darmstadt, Institute for Mechatronic Systems, Germany

Active vibration control of a gyroscopic rotor using experimental modal analysis

Jens Jungblut Christian Fischer Stephan Rinderknecht
Bulletin of the Polish Academy of Sciences Technical Sciences | 2021 | 69 | 6 | e138090 | DOI: 10.24425/bpasts.2021.138090
Keywords modal analysis active vibration control piezoelectrical bearing
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Abstract

A gyroscopic rotor exposed to unbalance is studied and controlled with an active piezoelectrical bearing. A model is required in order to design a suited controller. Due to the lack of related publications utilizing piezoelectrical bearings and obtaining a modal model purely exploiting experimental modal analysis, this paper reveals a method to receive a modal model of a gyroscopic rotor system with an active piezoelectrical bearing. The properties of the retrieved model are then incorporated into the design of an originally model-free control approach for unbalance vibration elimination, which consists of a simple feedback control and an adaptive feedforward control. After the discussion on the limitations of the model-free control, a modified controller using the priorly identified modal model is implemented on an elementary rotor test-rig comparing its performance to the original model-free controller.
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Bibliography

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Authors and Affiliations

Jens Jungblut
1
ORCID: ORCID
Christian Fischer
1
ORCID: ORCID
Stephan Rinderknecht
1
ORCID: ORCID
  1. Institute for Mechatronic Systems, Technical University Darmstadt, 64287, Germany

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