Purpose

This paper aims to examine the dynamic behaviours of a three-dimensional (3D) rod-fastening rotor bearing system (RFBS) with a crack in a fastening rod.

Design/methodology/approach

Based on the 3D finite element method model and stress analysis of a cracked RFBS, a 3D dynamic model of the RFBS with a crack in a fastening rod is established with considering the initial bending and stress redistribution caused by the crack. A combined numerical simulation technology is used to investigate the dynamic behaviours of the system.

Findings

The distribution of contact stress between the two disks will be not uniform, and the initial bending of the system will occur due to the presence of a crack. This will lead to the change of system stiffness and the dynamic behaviours such as vibration amplitude, and motion orbits will change significantly.

Research limitations/implications

A 3D finite element method dynamic model is proposed for the study of dynamic characteristics of complex combined rotor bearing system with cracks.

Practical implications

It is helpful and significant to master the dynamic behaviours of cracked RFBS. It is helpful to detect the presence of a crack of the rotor bearing system.

Social implications

Some of the losses caused by crack failure may be reduced.

Originality/value

The proposed 3D method can provide a useful reference for the study of dynamic characteristics of complex combined rotor bearing system with cracks.

Peer review

The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-05-2020-0189

中文翻译：

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横向裂纹对3D杆紧固转子轴承系统动力学行为的影响

目的

本文旨在研究三维（3D）杆紧固转子轴承系统（RFBS）的动态行为，该系统在紧固杆中出现裂纹。

设计/方法/方法

基于3D有限元方法模型和裂纹RFBS的应力分析，考虑到裂纹引起的初始弯曲和应力重新分布，建立了紧固杆中带有裂纹的RFBS的3D动态模型。组合数值模拟技术用于研究系统的动态行为。

发现

两个磁盘之间的接触应力分布将不均匀，并且系统的初始弯曲将由于存在裂纹而发生。这将导致系统刚度发生变化，并且动态行为（例如，振动幅度）和运动轨道将发生显着变化。

研究局限/意义

为了研究复杂的裂纹复合转子轴承系统的动力学特性，提出了一种3D有限元动力学模型。

实际影响

掌握破裂的RFBS的动态行为是有帮助且有意义的。检测转子轴承系统是否存在裂纹是有帮助的。

社会影响

由裂纹破坏引起的一些损失可以减少。

创意/价值

所提出的3D方法可以为研究复杂的裂纹复合转子轴承系统的动力特性提供有益的参考。

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-05-2020-0189