Purpose

High power and speed are new demands for rotating machinery which needs the journal bearings with high dynamic characteristics. The critical speed of the rotor-bearing system is one of the most significant parameters to evaluate the dynamic characteristics. This paper aims to investigate the theoretical and experimental analysis of a rotor system supported by large diameter elliptical bearings.

Design/methodology/approach

To obtain the theoretical and experimental support for rotor-bearing system design, dynamic characteristics theoretical analysis based on the finite difference method is given and an experiment focuses on critical speed identification is carried out.

Findings

The theoretical calculation results indicate that the critical speed is near to 800 rpm and there is no large vibration amplitude round working speed (1,500 rpm). Using the test bench in the factory unit, vibration data including three experimental processes are obtained. According to the vibration data, the critical speed is identified which also indicates that it is stable when working at 1,500 rpm.

Originality/value

The design method for the rotor system supported by large diameter elliptical bearing can be obtained by the theoretical and experimental results shown in this paper.

Peer review

The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-04-2020-0122/

中文翻译：

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椭圆轴承支承的转子轴承系统的理论和实验动力学分析

目的

高功率和高速度是对旋转机械的新要求，该旋转机械需要具有高动态特性的轴颈轴承。转子轴承系统的临界转速是评估动态特性的最重要参数之一。本文旨在研究由大直径椭圆轴承支撑的转子系统的理论和实验分析。

设计/方法/方法

为获得转子轴承系统设计的理论和实验支持，基于有限差分法进行了动力特性理论分析，并进行了临界转速辨识实验。

发现

理论计算结果表明，临界转速接近800 rpm，在工作转速（1500 rpm）附近没有较大的振幅。使用工厂单位的测试台，可以获得包括三个实验过程的振动数据。根据振动数据，可以确定临界速度，该临界速度也表明它在1,500 rpm下工作时是稳定的。

创意/价值

通过本文所示的理论和实验结果，可以得出大直径椭圆轴承支撑的转子系统的设计方法。

同行评审

本文的同行评审历史记录可在以下网址获得：https://publons.com/publon/10.1108/ILT-04-2020-0122/