Nonlinear analysis and prevention of wings flutter

气动弹性是一门多学科的工程领域，研究气动、惯性和弹性三者之间的相互作用。气动弹性现象是飞机结构失稳问题的潜在根源。这些现象中最重要的方面是机翼的发散振荡，即颤振。最近的研究表明，在现代飞机上有相当多的非线性行为的潜在来源，非线性可以显著影响飞机结构的气动弹性特性。本研究计划的主要目标是寻求持续支持，以进行飞机结构颤振分析和预防研究，并在瑞尔森大学新成立的航空航天工程系成立一个气动弹性研究小组。这将确保大学培养的研究生能够满足对气动弹性专业知识的需求。在过去的几年里，申请人一直在研究考虑非线性的飞机机翼的气动弹性行为。防止这种系统的气动弹性不稳定性的方法也进行了研究。在本研究计划中，这些调查将得到加强和完成。使用非线性信号分析方法来识别气动弹性不稳定性也在申请人的NSERC资助的过去几年中进行了探索。该方法取得了令人鼓舞的结果，并将在本研究计划中进一步完善。

Aeroelasticity is a multi-disciplinary field in engineering that studies the interaction among aerodynamic, inertia and elastic forces. Aeroelastic phenomena are a potential source of instability problem for aircraft structures. The most important aspect of these phenomena is divergent oscillation of wings known as flutter. Recent investigations have shown that there are a considerable number of potential sources of nonlinear behaviour on modern aircraft, and nonlinearities can significantly influence the aeroelastic characteristics of aircraft structure. The main objective of this research proposal is to seek continued support to carry on research in analysis and prevention of flutter in aircraft structures, and to initiate an aeroelasticity research group in the new Department of Aerospace Engineering at Ryerson University. This will ensure university training of graduate students to meet the demand for expertise in aeroelasticity. During the past several years, the applicant has been studying aeroelastic behaviour of aircraft wings taking into account nonlinearties. Methods of preventing aeroelastic instabilities for such systems have also been investigated. In this research proposal, these investigations will be enhanced and completed. The use of nonlinear signal analysis methods to identify aeroelastic instabilities has also been explored in the past few years of the applicant's NSERC grant. This method gave very encouraging results, and it will be further improved in this research proposal.