Experimental evaluation of the dynamic properties of an energy microturbine with defects in the rotating system

Żywica, Grzegorz; Kaczmarczyk, Tomasz Z.

doi:10.17531/ein.2019.4.17

Cited by 5 publications

(3 citation statements)

References 28 publications

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“…Second, except for Abdelrhman et al. 24 and Żywic and Kacmarczyk, 26 all axial rubs are point axial rub caused by pitching motion of disks attached to the bending shaft. Pitch angle of rotor thrust plate is essential to the calculation of rub force and moment.…”

Section: Introductionmentioning

confidence: 99%

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Numerical and Experimental Investigation on Axial Rub Impact Dynamic Characteristics of Flexible Rotor Supported by Hybrid Gas Bearings

Long

Han

Zhao

et al. 2021

Journal of Low Frequency Noise, Vibration and Active Control

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Gas bearings are widely used in micro- and small turbomachinery. Because of the pursuit of high efficiency, turbomachinery adopts small clearance of rotor and stator. The gas bearing rotor system easily suffers from rub impact due to the inherently low damping and load capacity of gas film. Axial rub impact may lead to catastrophic failure of gas bearing rotor system. Previous work put emphasis on radial rub, and only a few papers researched on the axial rub impact by simulation method. In this paper, dynamic responses of full annular axial rub are investigated numerically and experimentally. A single span flexible rotor test rig is established to support this research. Dynamic characteristics of full annular axial rub of this gas bearing rotor system are obtained with finite element language-APDL. Dynamic characteristics within full speed range are experimentally researched based on the test rig. The dynamic behaviors are analyzed by means of waterfall diagrams, frequency spectrums, orbit trails, and vibration amplitude waveforms. During speed up, half speed whirl and gas film oscillation occur in radial direction. During speed down, the full annular axial rub between rotor thrust disk and gas bearing occurs. When lightly axial rub impact happens, the vibration patterns in the radial direction change barely, and 0 Hz component appears in the axial direction. When serious full annular axial rub impact happens, 0 Hz component occurs in both radial and axial directions and rotor orbit shows transverse motion in radial direction. These forms of dynamic characteristics can be effectively used to diagnose the full annular axial rub impact.

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Section: Introductionmentioning

confidence: 99%

“…At low speed, the characteristics are more like that of radial rub. Żywic and Kaczmarczyk 26 experimentally researched the dynamic characteristics of axial rub impact between gas thrust bearing and keep plate. The 1× component, super-harmonic components, and neighboring frequencies occur during the rub procedure.…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Investigation on Axial Rub Impact Dynamic Characteristics of Flexible Rotor Supported by Hybrid Gas Bearings

Long

Han

Zhao

et al. 2021

Journal of Low Frequency Noise, Vibration and Active Control

View full text Add to dashboard Cite

show abstract

“…The best known are magnetic bearings [54]. A comprehensive research on various types of both liquid and gas lubricated sliding bearings is underway [7,42,43,58]. The common feature of these bearings is the control system, which also is implemented in many ways.…”

Section: Introductionmentioning

confidence: 99%

Comparable analysis of PID controller settings in order to ensure reliable operation of active foil bearings

Witanowski¹,

Breńkacz²,

Szewczuk-Krypa³

et al. 2022

Eksploatacja i Niezawodność – Maintenance and Reliability

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In comparison to the traditional solutions, active bearings offer great operating flexibility, ensure better operating conditions over a wider range of rotational speeds and are safe to use. In order to ensure optimum bearing performance a bearing control system is used that adapts different geometries during device operation. The selection of optimal controller parameters requires the use of modern optimization methods that make it possible to quickly achieve the assumed parameters. This article presents the method that has been employed to select the parameters of a proportional integral derivative (PID) controller, in which both stochastic algorithms and hybrid methods have been compared. The results show that all of the used algorithms were able to reach the global optimum but only the hybrid algorithm was repeatable in all runs within a low value of the standard deviation. The best solution will be proposed in the future to control an active foil bearing. Analysing of this paper would help to prevent failures of active foil bearing used in the designed rotating machine.

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Comparison of the characteristics of journal bearings determined according to ISO 7902:2020 and obtained by other methods

Smykla

Fillon

Olszewski

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part J:

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The article presents selected characteristics of journal bearings calculated with the use of various methods and compared to the results obtained with application of the basic bearing characteristics calculation procedure, as described in the ISO 7902:2020 standard. Additionally, the presented calculation results were compared with the parameters measured during experimental tests of the sliding bearings, working under loads and at sliding velocity, and maintaining other operating conditions, as assumed in theoretical research. The regula falsi iteration method was successfully implemented. The research results have confirmed the usefulness of various calculation methods since the values of selected characteristics of the journal bearing obtained were comparable.

show abstract

Experimental evaluation of the dynamic properties of an energy microturbine with defects in the rotating system

Cited by 5 publications

References 28 publications

Numerical and Experimental Investigation on Axial Rub Impact Dynamic Characteristics of Flexible Rotor Supported by Hybrid Gas Bearings

Numerical and Experimental Investigation on Axial Rub Impact Dynamic Characteristics of Flexible Rotor Supported by Hybrid Gas Bearings

Comparable analysis of PID controller settings in order to ensure reliable operation of active foil bearings

Comparison of the characteristics of journal bearings determined according to ISO 7902:2020 and obtained by other methods

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