Effect of elastic support on the vibration characteristics of mistuned coated blisks

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL Thin-Walled Structures Pub Date : 2024-10-26 DOI:10.1016/j.tws.2024.112616

Xianfei Yan , Wei Sun

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Abstract

Boundary conditions significantly affect the vibration characteristics of mechanical structures. Hard coatings are applied to reduce the vibration levels of blisks, and the modelling methods and vibration characteristics of mistuned coated blisks have been investigated under hard-support boundary conditions. However, the behavior of coated blisks under elastic support has not been previously studied. This paper presents a finite element model to simulate elastic support using two methods and develops reduced-order models to analyze coated blisks under elastic support. Furthermore, the effects of elastic support on the vibration characteristics of tuned, deterministic, and randomly mistuned blisks are investigated with a detailed discussion of the underlying mechanisms. The results indicate that elastic support has a notable impact on the natural frequencies and resonant responses at nodal diameters 1 and 2 in tuned-coated blisks. For deterministic mistuned blisks, the amplitude amplification factor varies in frequency-veering regions and frequency-intersecting regions with increasing support stiffness. Elastic support can reduce the forced responses of randomly mistuned blisks, and the well-known peak-value phenomenon is not observed in some cases based on statistical analyses.

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弹性支撑对雾化涂层磁盘振动特性的影响

边界条件对机械结构的振动特性有很大影响。硬涂层的应用可降低叶盘的振动水平，在硬支撑边界条件下，已对雾化涂层叶盘的建模方法和振动特性进行了研究。但是，以前还没有研究过弹性支撑下涂层叶盘的行为。本文提出了一种使用两种方法模拟弹性支撑的有限元模型，并建立了简化模型来分析弹性支撑下的涂布叶盘。此外，还研究了弹性支撑对调谐、确定性和随机失谐叶盘振动特性的影响，并详细讨论了其基本机制。结果表明，弹性支撑对调谐涂层叶盘节点直径 1 和 2 的固有频率和共振响应有显著影响。对于确定性失谐叶盘，振幅放大系数在频率偏移区域和频率相交区域随支撑刚度的增加而变化。根据统计分析，弹性支撑可降低随机失谐叶盘的强迫响应，在某些情况下不会出现众所周知的峰值现象。

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来源期刊

Thin-Walled Structures 工程技术-工程：土木

CiteScore

9.60

自引率

20.30%

发文量

801

审稿时长

66 days

期刊介绍： Thin-walled structures comprises an important and growing proportion of engineering construction with areas of application becoming increasingly diverse, ranging from aircraft, bridges, ships and oil rigs to storage vessels, industrial buildings and warehouses. Many factors, including cost and weight economy, new materials and processes and the growth of powerful methods of analysis have contributed to this growth, and led to the need for a journal which concentrates specifically on structures in which problems arise due to the thinness of the walls. This field includes cold– formed sections, plate and shell structures, reinforced plastics structures and aluminium structures, and is of importance in many branches of engineering. The primary criterion for consideration of papers in Thin–Walled Structures is that they must be concerned with thin–walled structures or the basic problems inherent in thin–walled structures. Provided this criterion is satisfied no restriction is placed on the type of construction, material or field of application. Papers on theory, experiment, design, etc., are published and it is expected that many papers will contain aspects of all three.