Identification of dynamic parameters of journal bearings in an asymmetric rotor-bearing system

IF 1.5 4区工程技术 Q3 ENGINEERING, MECHANICAL Industrial Lubrication and Tribology Pub Date : 2024-07-02 DOI:10.1108/ilt-03-2024-0096

Yinsi Chen, Yuan Li, Heng Liu, Yi Liu

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引用次数: 0

Abstract

Purpose

The purpose of this study is to identify the dynamic parameters of journal bearings in asymmetric rotor systems without additional test runs or excitations.

Design/methodology/approach

An asymmetric rotor-bearing test rig was set up for the identification experiment. Comparations were made between the measured response of the asymmetric rotor and the symmetric rotor. The mathematical model of the asymmetric rotor is established by the finite element method. The identification algorithm is based on the model of the rotor and the measured vibration response to identify bearing parameters. The influence of modeling error and measurement noise on the identification results are numerically analyzed. The dynamic parameters of the journal bearings under different rotational speeds are identified and compared with the theoretical values calculated by the perturbation method.

Findings

The experiment results show that the vibration characteristics of the asymmetric rotor and the symmetric rotor are different. The numerical evaluation of the identification algorithm shows that the algorithm is accurate and has good robustness to modeling error and measurement noise. The identified dynamic parameters agree reasonably well with the parameters derived from the theoretical bearing model.

Originality/value

The proposed identification method uses the unique vibration characteristics of asymmetric rotors to identify the bearing dynamic parameters. As the method does not require excitations or additional test runs, it is suitable for the field test.

Peer review

The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-03-2024-0096/

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非对称转子轴承系统中轴颈轴承动态参数的确定

目的本研究的目的是识别不对称转子系统中轴颈轴承的动态参数，而无需额外的测试运行或激励。对非对称转子和对称转子的测量响应进行了比较。通过有限元法建立了非对称转子的数学模型。识别算法基于转子模型和测量到的振动响应来识别轴承参数。数值分析了建模误差和测量噪声对识别结果的影响。实验结果表明，非对称转子和对称转子的振动特性不同。对识别算法的数值评估表明，该算法准确无误，对建模误差和测量噪声具有良好的鲁棒性。所识别的动态参数与轴承理论模型得出的参数相当吻合。由于该方法不需要激励或额外的测试运行，因此适用于现场测试。同行评议本文的同行评议记录可在以下网址查阅：https://publons.com/publon/10.1108/ILT-03-2024-0096/。

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来源期刊

Industrial Lubrication and Tribology 工程技术-工程：机械

CiteScore

3.00

自引率

18.80%

发文量

129

审稿时长

1.9 months

期刊介绍： Industrial Lubrication and Tribology provides a broad coverage of the materials and techniques employed in tribology. It contains a firm technical news element which brings together and promotes best practice in the three disciplines of tribology, which comprise lubrication, wear and friction. ILT also follows the progress of research into advanced lubricants, bearings, seals, gears and related machinery parts, as well as materials selection. A double-blind peer review process involving the editor and other subject experts ensures the content''s validity and relevance.