Vibration characteristics of a pretwisted multi-blade-shaft system with blade stiffness mismatch

IF 5 1区工程技术 Q1 ENGINEERING, AEROSPACE Aerospace Science and Technology Pub Date : 2024-10-04 DOI:10.1016/j.ast.2024.109518

Ju Su , Yu Lin , Tian Yu Zhao

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Abstract

The substructure mode synthesis method is employed to establish a mathematical model in this paper. The main body is represented by shaft, while the branching components are represented by blades. By solving this model, accurate frequency results of the rotating blade-shaft system are obtained at a high computational speed that meets engineering requirements. The resulting mode diagram aligns with that of the finite element model. Utilizing this model, the stiffness detuning of the rotating blade shaft system is investigated through a combination of surrogate modeling and ant colony algorithm, leading to several significant findings. It is observed that an increase in the standard deviation of stiffness detuning amplifies the length of frequency interval while minimally affecting the frequency mean value. Moreover, an increase in average stiffness expands the interval length for system frequencies. Additionally, higher rotational speeds reduce the interval length for blade-dominant vibrations but extend it for shaft-dominant vibrations.

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叶片刚度不匹配的预扭曲多叶片-轴系统的振动特性

本文采用子结构模式合成法建立数学模型。轴代表主体，叶片代表分支部件。通过对该模型的求解，可获得叶片-轴旋转系统的精确频率结果，计算速度快，符合工程要求。所得到的模态图与有限元模型的模态图一致。利用该模型，结合代用建模和蚁群算法，对旋转叶片轴系统的刚度失谐进行了研究，得出了一些重要发现。研究发现，刚度失谐标准偏差的增加会放大频率间隔的长度，而对频率平均值的影响却很小。此外，平均刚度的增加会扩大系统频率的间隔长度。此外，转速越高，叶片主导振动的频率间隔长度越短，而轴主导振动的频率间隔长度则越长。

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来源期刊

Aerospace Science and Technology 工程技术-工程：宇航

CiteScore

10.30

自引率

28.60%

发文量

654

审稿时长

54 days

期刊介绍： Aerospace Science and Technology publishes articles of outstanding scientific quality. Each article is reviewed by two referees. The journal welcomes papers from a wide range of countries. This journal publishes original papers, review articles and short communications related to all fields of aerospace research, fundamental and applied, potential applications of which are clearly related to: • The design and the manufacture of aircraft, helicopters, missiles, launchers and satellites • The control of their environment • The study of various systems they are involved in, as supports or as targets. Authors are invited to submit papers on new advances in the following topics to aerospace applications: • Fluid dynamics • Energetics and propulsion • Materials and structures • Flight mechanics • Navigation, guidance and control • Acoustics • Optics • Electromagnetism and radar • Signal and image processing • Information processing • Data fusion • Decision aid • Human behaviour • Robotics and intelligent systems • Complex system engineering. Etc.