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The coupling vibration characteristics of a flexible shaft-disk-blades system with mistuned features

机译：具有失谐特征的挠性轴-盘-叶片系统的耦合振动特性

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The purpose of this paper is to investigate the coupling vibration characteristics of a flexible shaft-disk-blades system with mistuned features. There are some new phenomena due to the coupling effects of shaft-bending, shaft-torsion, disk-transverse and blade-bending. In this investigation, this paper mainly focuses on the influence of mistuned features of the blade's length and the stagger angle. It is found that there are four types of coupling modes: the coupling mode of shaft bending, disk transverse and blade bending (SDB), the coupling mode of shaft torsion disk transverse-blade bending (TDB), the coupling mode of disk transverse and blade bending (DB), the repeated mode of blade bending-blade bending (BB). With the effect of mistuned features, the natural frequencies and the coupling mode type will change correspondingly. With the mistuning value of blade length employed in this study, the TDB mode in the tuned system will disappear and shift into TSDB mode instead, and one of the repeated SDB modes will be replaced by STDB modes. Due to this mistuned features, the blades and disk experience a certain degree of vibration localization phenomenon. Different from the length feature, the influence of mistuning values of blade's stagger angle mainly take effect on the coupling modes. At last, by inspection on the Campbell diagrams, the influence of rotational speed on the transformation of natural frequencies is illustrated on the tuned/mistuned flexible shaft-disk-blades coupling structure. (C) 2018 Elsevier Inc. All rights reserved.
机译：本文的目的是研究具有失谐特征的挠性轴-盘-叶片系统的耦合振动特性。由于轴弯曲，轴扭转，盘横向弯曲和叶片弯曲的耦合效应，出现了一些新现象。在这项研究中，本文主要集中在叶片长度和交错角度的失谐特征的影响上。结果表明，耦合方式有四种：轴弯曲，圆盘横向弯曲和叶片弯曲（SDB）耦合方式，轴扭盘横向叶片弯曲（TDB）的耦合方式，圆盘横向弯曲和圆盘弯曲的耦合方式。叶片弯曲（DB），即叶片弯曲-叶片弯曲（BB）的重复模式。受到功能失调的影响，固有频率和耦合模式类型将相应变化。利用本研究中使用的叶片长度的模糊值，已调谐系统中的TDB模式将消失并转而变为TSDB模式，而重复的SDB模式之一将被STDB模式代替。由于这种失调的特性，叶片和磁盘会经历一定程度的振动局部化现象。与长度特征不同，叶片错位角的微调值的影响主要影响耦合模式。最后，通过对坎贝尔图的检查，在调谐/失谐的挠性轴-盘-叶片耦合结构上说明了转速对固有频率变换的影响。 （C）2018 Elsevier Inc.保留所有权利。

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