Dynamic modeling and active aeroelastic flutter control of functionally graded irregular plates with piezoelectric layers based on the discrete-coupling method

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures Pub Date : 2024-09-12 DOI:10.1016/j.tws.2024.112421

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引用次数: 0

Abstract

The research on active flutter control of functionally graded material structures is of great significance to improve the safety and stability of aerospace systems. Therefore, the purpose of this study is to analyze the active flutter control of functionally graded irregular plates (FGIP) by attaching piezoelectric layers to their surfaces. Firstly, a discrete-coupled modeling method for irregular panel structures is proposed. The main modeling idea is to discretize the whole structure and calculate the energy expression of the discretized individuals. Then, the adjacent individuals are coupled by artificial springs. Finally, the dynamic model of irregular panel structure is established based on the Hamilton principle. The validity of this modeling method is verified by comparing the results with the natural characteristics of the finite element model. The first-order supersonic piston theory is used to calculate aerodynamic pressure, and the flutter characteristics of FGIP under supersonic airflow are analyzed. In addition, the influence of the power law index of functionally graded materials on structural flutter characteristics is discussed. To suppress the flutter of FGIP, the displacement feedback control method is used to provide active stiffness for the structure and then change the flutter characteristics of the structure. The results show that active control can effectively improve the anti-flutter ability of the structure.

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基于离散耦合法的带压电层的功能分级不规则板的动态建模和主动气动弹性扑动控制

功能分级材料结构的主动扑动控制研究对于提高航空航天系统的安全性和稳定性具有重要意义。因此，本研究的目的是通过在功能分级不规则板（FGIP）表面附加压电层来分析其主动扑动控制。首先，本文提出了不规则板结构的离散耦合建模方法。主要建模思路是将整个结构离散化，并计算离散个体的能量表达式。然后，相邻个体通过人工弹簧耦合。最后，根据汉密尔顿原理建立不规则面板结构的动态模型。通过将结果与有限元模型的自然特性进行比较，验证了这种建模方法的有效性。利用一阶超音速活塞理论计算气动压力，并分析了 FGIP 在超音速气流下的飘动特性。此外，还讨论了功能分级材料的幂律指数对结构扑动特性的影响。为了抑制 FGIP 的扑动，采用了位移反馈控制方法为结构提供主动刚度，进而改变结构的扑动特性。结果表明，主动控制能有效提高结构的抗扑动能力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.

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