Predictive capability of various linearization approaches for floating-ring bearings in nonlinear dynamics of turbochargers

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F49777513%3A23520%2F20%3A43957283" target="_blank" >RIV/49777513:23520/20:43957283 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0094114X20300641?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0094114X20300641?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.mechmachtheory.2020.103843" target="_blank" >10.1016/j.mechmachtheory.2020.103843</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Predictive capability of various linearization approaches for floating-ring bearings in nonlinear dynamics of turbochargers

Popis výsledku v původním jazyce

A floating-ring bearing (FRB) is composed of a journal, a floating ring and a housing which are separated by two thin oil films. This system is inherently nonlinear and if it is lightly loaded or operated at high speeds, it is prone to the fluid-induced instability. The threshold speed for the instability of a journal bearing with one oil film can be estimated using linearized forces acting in the film. However, the linear analysis of FRB might be problematic because results of such an analysis are usually difficult to interpret. Nevertheless, the linear analysis can provide some basic insights into system behaviour. This work aims to evaluate in detail the use of linear theory in the stability analysis of rotating systems supported on FRBs. Several approaches for the linearization of the forces acting in FRB are proposed and analysed. The results are visualized in the form of a holistic Campbell diagram which together depicts natural frequencies, whirl frequencies, modal damping and a precession of mode shapes. Moreover, it is demonstrated that the holistic Campbell diagram can be used in order to interpret -- and to some extent also in order to predict -- results of nonlinear analysis.

Název v anglickém jazyce

Predictive capability of various linearization approaches for floating-ring bearings in nonlinear dynamics of turbochargers

Popis výsledku anglicky

A floating-ring bearing (FRB) is composed of a journal, a floating ring and a housing which are separated by two thin oil films. This system is inherently nonlinear and if it is lightly loaded or operated at high speeds, it is prone to the fluid-induced instability. The threshold speed for the instability of a journal bearing with one oil film can be estimated using linearized forces acting in the film. However, the linear analysis of FRB might be problematic because results of such an analysis are usually difficult to interpret. Nevertheless, the linear analysis can provide some basic insights into system behaviour. This work aims to evaluate in detail the use of linear theory in the stability analysis of rotating systems supported on FRBs. Several approaches for the linearization of the forces acting in FRB are proposed and analysed. The results are visualized in the form of a holistic Campbell diagram which together depicts natural frequencies, whirl frequencies, modal damping and a precession of mode shapes. Moreover, it is demonstrated that the holistic Campbell diagram can be used in order to interpret -- and to some extent also in order to predict -- results of nonlinear analysis.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20302 - Applied mechanics

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

MECHANISM AND MACHINE THEORY

ISSN

0094-114X

e-ISSN

—

Svazek periodika

149

Číslo periodika v rámci svazku

July 2020

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

18

Strana od-do

1-18

Kód UT WoS článku

000525899100027

EID výsledku v databázi Scopus

2-s2.0-85080077817