Semi-Analytical Study by Nonlinear Substructure Method Based on Frequency Response Functions to Determine Folding Wing Dynamic Behavior with Nonlinear Effects

IF 1.9 4区 工程技术 Q3 ENGINEERING, MECHANICAL
M. Ghadimi, R. Azarafza, A. Davar, J. Eskandari Jam
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引用次数: 0

Abstract

Folding wings are used in the design of rockets or airplanes to increase space and maneuverability. To ensure proper operation of the folding wing mechanism, some free play is required, causing it to behave non-linearly. This research uses a nonlinear method based on frequency response functions, considering the structure connection's geometry, by creating a nonlinear dynamic model of the assembled structure and through the structural coupling method that includes free play in the connections. Also, a new technique is presented that uses the results of the substructure method to extract energy diagrams, which are useful in determining the frequency range in which linear and nonlinear modes are coupled. These results are significant for understanding the behavior of the structure under aerodynamic loads and optimizing its performance. To verify the results, nonlinear sinusoidal vibration experiments and finite element analysis were performed. The extracted dynamic model in each frequency mode allows for examining the linearity or nonlinearity, stiffness or softness of the modes, and determining the degree of nonlinearity.

基于频响函数的非线性子结构法求解非线性效应下折叠翼动力特性的半解析研究
折叠机翼用于火箭或飞机的设计,以增加空间和机动性。为了确保折叠翼机构的正常运行,需要一些自由发挥,导致其非线性行为。本研究采用基于频响函数的非线性方法,考虑结构连接件的几何形状,通过建立装配结构的非线性动力学模型,并通过包含连接件自由发挥的结构耦合方法。此外,本文还提出了一种利用子结构法的结果提取能量图的新方法,该方法可用于确定线性模态和非线性模态耦合的频率范围。这些结果对于了解结构在气动载荷作用下的行为和优化其性能具有重要意义。为了验证结果,进行了非线性正弦振动实验和有限元分析。在每个频率模式下提取的动态模型允许检查模式的线性或非线性,刚度或柔软性,并确定非线性程度。
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
Experimental Techniques
Experimental Techniques 工程技术-材料科学:表征与测试
CiteScore
3.50
自引率
6.20%
发文量
88
审稿时长
5.2 months
期刊介绍: Experimental Techniques is a bimonthly interdisciplinary publication of the Society for Experimental Mechanics focusing on the development, application and tutorial of experimental mechanics techniques. The purpose for Experimental Techniques is to promote pedagogical, technical and practical advancements in experimental mechanics while supporting the Society''s mission and commitment to interdisciplinary application, research and development, education, and active promotion of experimental methods to: - Increase the knowledge of physical phenomena - Further the understanding of the behavior of materials, structures, and systems - Provide the necessary physical observations necessary to improve and assess new analytical and computational approaches.
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