Computational study of friction models’ parameters in a heavily loaded ball and socket coupling

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F49777513%3A23520%2F23%3A43969019" target="_blank" >RIV/49777513:23520/23:43969019 - isvavai.cz</a>

Result on the web

<a href="https://multibody2023.tecnico.ulisboa.pt/prog_MULTIBODY_WEB/MULTBODY2023_ABSTRACTS/ID_156_426_mbd23_Bulin_rev.pdf" target="_blank" >https://multibody2023.tecnico.ulisboa.pt/prog_MULTIBODY_WEB/MULTBODY2023_ABSTRACTS/ID_156_426_mbd23_Bulin_rev.pdf</a>

DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Computational study of friction models’ parameters in a heavily loaded ball and socket coupling

Original language description

This work investigates the effect of various friction models&apos; parameters used in a heavily loaded ball and socket coupling. The case study is performed on the ball and socket (BS) coupling of a tilting pad journal bearing (TPJB) used in large rotors, which can be heavily loaded by both static (rotor weight) and dynamic (rotor imbalance) loads. The TPJB contains movable pads whose motion is enabled by flexible supports, such as the spherical pivots with the BS construction. Two types of friction models are studied - the Bengisu-Akay (BA) model as a representative of static friction models and the amended LuGre model as a dynamic friction model. The effect of various friction models&apos; parameters on the dynamic behaviour of the whole TPJB system with BS couplings is investigated using steady-state operation at a certain rotor speed and run-up simulation with rotor imbalance. It can be observed that commonly used values of friction models&apos; parameters, such as the critical velocity of the BA model or the bristle stiffness factor of the LuGre model, can give misleading results. Therefore, without the experiments, which are hard to perform in this application, these parameters should be chosen carefully concerning the problem being solved. Based on the computational studies, the tested friction models led to qualitatively different results in the pad tilting motion. The essential role of precise BS friction modelling in the whole rotor systems computational modelling is further discussed in the paper. The presented models can also be used for more detailed analysis of rotor nonlinear phenomena and in problems of durability and wear.

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

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OECD FORD branch

20302 - Applied mechanics

Project

<a href="/en/project/TK04020057" target="_blank" >TK04020057: Improving the reliability of steam turbine operation considering radial bearings life</a><br>

Continuities

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

Publication year

2023

Confidentiality

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