Vibration Reduction of an Overhung Rotor Supported by an Active Magnetic Bearing Using a Decoupling Control System

Numanoy, Nitisak; Srisertpol, Jiraphon

doi:10.3390/machines7040073

Cited by 13 publications

(7 citation statements)

References 21 publications

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“…In order to minimize potential impact on the interferometer, the cylinder-related setup should be properly isolated from the detecting apparatus. Possibly, a magnetic suspension of the cylinders could be employed to reduce any periodic vibrations due to the cylinders' imperfections [44]. The external noise can be significantly lowered by shielding the interferometer from electromagnetic background, as well as installing the detection apparatus on an active vibration isolation system [45].…”

Section: Methodsmentioning

confidence: 99%

Atom interferometers and a small-scale test of general relativity

Mikołaj¹

2022

Preprint

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Since the first appearance of general relativity in 1916, various experiments have been conducted to test the theory. Due to the weakness of the interactions involved, all of the documented tests were carried out in a gravitational field generated by objects of an astronomical scale. We propose an idea for an experiment that could detect purely general-relativistic effects in a lab-generated gravitational field. It is shown that a set of dense rapidly-revolving cylinders produce a frame-dragging effect substantial enough to be two orders of magnitude away from the observable range of the next generation of atomic interferometers.. The metric tensor due to a uniform rotating axisymmetric body in the weak-field limit is calculated and the phaseshift formula for the interferometer is derived. This article is meant to demonstrate feasibility of the concept and stimulate further research into the field of low-scale experiments in general relativity. It is by no means a fully developed experiment proposal.

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Section: Methodsmentioning

confidence: 99%

Atom interferometers and a small-scale test of general relativity

Mikołaj¹

2022

Preprint

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“…In order to minimize potential impact on the interferometer, the cylinder-related setup should be properly isolated from the detecting apparatus. Possibly, a magnetic suspension of the cylinders could be employed to reduce any periodic vibrations due to the cylinders' imperfections [50]. The external noise can be significantly lowered by shielding the interferometer from electromagnetic background, as well as installing the detection apparatus on an active vibration isolation system [51].…”

Section: Methodsmentioning

confidence: 99%

Atom interferometers and a small-scale test of general relativity

Mikołaj

2022

Gen Relativ Gravit

View full text Add to dashboard Cite

Since the first appearance of general relativity in 1916, various experiments have been conducted to test the theory. Due to the weakness of the interactions involved, all of the documented tests were carried out in a gravitational field generated by objects of an astronomical scale. We propose an idea for an experiment that could detect purely general-relativistic effects in a lab-generated gravitational field. It is shown that a set of dense rapidly-revolving cylinders produce a frame-dragging effect substantial enough to be two orders of magnitude away from the observable range of the next generation of atomic interferometers. The metric tensor due to a uniform rotating axisymmetric body in the weak-field limit is calculated and the phase shift formula for the interferometer is derived. This article is meant to demonstrate feasibility of the concept and stimulate further research into the field of low-scale experiments in general relativity. It is by no means a fully developed experiment proposal.

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“…Control methods are usually based on state feedback or adaptive filters [25,26]. An active magnetic bearing was used in [27] to reduce vibrations with overhung rotors. In many cases, however, torsional displacement is not easily measured in the drivetrain.…”

Section: Torsional Vibrationsmentioning

confidence: 99%

Mitigation of Torsional Vibrations in a Modular Drivetrain with Interleaving Control

Verkroost

Sergeant

et al. 2022

Machines

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In order to meet requirements in machine design, modularity is often brought forward as a way to cope with load variations and adaptability of the architecture. The considered modular drivetrain consists of several identical induction motors, called motor modules, in cascade on the same shaft. However, implementing a modular drivetrain design evidently has an impact on the performance of the application. New opportunities may arise, such as improved motion dynamics and tolerance to failures. However, on other aspects, e.g., torsional vibrations and synchronization, performance can be negatively influenced. By adding multiple actuators in the drivetrain, additional sources of torque ripple are introduced. The aim of this article is first to investigate the impact of using a modular design on the torsional vibrations in the drivetrain, and second to mitigate these vibrations via an interleaving strategy of the PWM (pulse-width modulation) signals. Simulations and experimental data show that the modular setup requires a proper control strategy in order to ensure that the torsional vibrations in the system remain within the range of a traditional non-modular design. Interleaving of the PWM carrier waveforms in the different motor modules is proposed as a control method to mitigate the torsional vibrations identified in the modular drivetrain. This strategy results in a drivetrain setup that slightly outperforms the benchmark in terms of torsional vibrations.

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Vibration Reduction of an Overhung Rotor Supported by an Active Magnetic Bearing Using a Decoupling Control System

Cited by 13 publications

References 21 publications

Atom interferometers and a small-scale test of general relativity

Atom interferometers and a small-scale test of general relativity

Atom interferometers and a small-scale test of general relativity

Mitigation of Torsional Vibrations in a Modular Drivetrain with Interleaving Control

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