Nonlinear analysis and prevention of wings flutter

气动弹性是一个多学科交叉的工程领域，研究气动力、惯性力和弹性力之间的相互作用。气动弹性现象是飞机结构失稳的潜在原因。这些现象中最重要的一个方面是机翼的发散振荡，即所谓的颤振。最近的研究表明，现代飞机存在着大量的潜在非线性行为源，非线性对飞机结构的气动弹性特性有着重要的影响。该研究计划的主要目的是寻求持续的支持，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。这将确保研究生的大学培训，以满足在气动弹性专业知识的需求。在过去几年中，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。还研究了防止这种系统气动弹性不稳定性的方法。在本研究提案中，将加强和完成这些调查。在申请人获得NSERC资助的过去几年中，也对利用非线性信号分析方法来识别气动弹性不稳定性进行了探索。该方法得到了非常令人鼓舞的结果，并将在本研究中进一步改进。

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.