Purpose

This study aims to obtain the dynamic behaviours of cracked rod-fastening rotor bearing system (RFBS), and experimental investigation was carried out to examine the dynamic characteristics of this kind of assembled rotor bearing system with a transverse crack passing through the critical speed.

Design/methodology/approach

An experimental test rig of cracked RFBS was established for examining the vibration behaviours between intact and cracked system. The crack on the surface of a fastening rod was simulated by wire-electrode cutting processing method. The comprehensive analysis method of vibration was used to obtain the dynamic characteristics such as vibration amplitude, acceleration and whirling orbits before and after the critical speed as well as the instantaneous response in the process of speed up.

Findings

Some experimental vibration datum is obtained for cracked RFBS. The appearance of a crack will introduce the initial bending and make the vibration amplitude, acceleration and instant response in the process of speed up increase greatly as well as the change of whirling orbits.

Originality/value

The actual vibration characteristics for this complex assembled rotor system with a transverse crack are given passing through the critical speed. It can provide some useful help for monitoring the vibration behaviours of this kind of assembled rotor system as well as the detection of the crack fault.

Peer review

The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-07-2020-0260/

中文翻译：

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带有横向裂纹的杆紧固转子轴承系统的实验动力学分析

目的

这项研究旨在获得裂纹杆紧固转子轴承系统（RFBS）的动力学行为，并进行了实验研究，以检验这种具有横向裂纹穿过临界速度的组合式转子轴承系统的动力学特性。

设计/方法/方法

建立了破解RFBS的实验测试台，以检查完整系统与破解系统之间的振动行为。通过线电极切割加工方法模拟了紧固杆表面的裂纹。利用振动的综合分析方法获得了临界速度前后的振动幅值，加速度和回旋轨道等动力学特性，以及加速过程中的瞬时响应。

发现

对于破裂的RFBS，获得了一些实验振动数据。裂纹的出现将引起初始弯曲，并使加速过程中的振动幅度，加速度和瞬时响应以及回旋轨道的变化大大增加。

创意/价值

通过临界速度，给出了具有横向裂纹的这种复杂的组装转子系统的实际振动特性。它可以为监测这种组装转子系统的振动行为以及检测裂纹故障提供一些有用的帮助。

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-07-2020-0260/