Non-linear aeroelasticity and health monitoring of anisotropic curved structures

各向异性弯曲结构的非线性气动弹性和健康监测

• 批准号: RGPIN-2015-03800
• 负责人: Lakis, AouniA
• 金额: $ 2.11万
• 依托单位: École Polytechnique de Montréal
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=589388
• 关键词: Non; linear; aeroelasticity; health; monitoring

The proposed work involves both fundamental and applied research. It is a continuation of the aforementioned research study by integrating more realistic and complex aspects of structure and flow, in which nonlinear aspects of structure as well as fluid nonlinearity and non-proportional damping will be considered. PROGRESS OF RESEARCH. In recent years, our team has studied two major areas: numerical analysis of fluid structure systems and signal processing methods for vibration. These studies led to the publication of numerous scientific articles and our results were used by companies such as IREQ, Spar Aerospace/EMS Technologies, CAE Electronics the NRC aerospace research institute’s structure, materials and propulsion group, Bombardier and P&WC. These studies produced the following results: Numerical simulation of vibration of cylindrical and conical shells subjected to compressible or incompressible fluid flow. Since these shell elements are used widely in aerospace structures, predicting the dynamic instability of shells subjected to flow is a challenging subject that aeronautical engineers are confronted with. For such a problem that contains complex structures, boundary conditions, materials and loading, an analytical model becomes very complicated when undergoing a change of factors affecting the flutter boundaries. Therefore, a numerical package based on a hybrid finite element method has been developed to describe the aeroelastic behavior of curved shells. It provides very fast and precise convergence compared to existing commercial FEM software at less computational time and cost. The results of these works have been presented at an international conference and published in international journals [1, 2]. The linear theory developed is adequate to predict the onset of flutter, however nonlinear shell theory required to capture the actual limit cycle amplitude of the flutter is left for this proposed research.

拟议的工作涉及基础研究和应用研究。它是上述研究的延续，通过整合结构和流动的更现实和更复杂的方面，其中将考虑结构的非线性方面以及流体非线性和非比例阻尼。 研究进展。近年来，我们团队研究了两个主要领域：流体结构系统的数值分析和振动信号处理方法。这些研究导致发表了大量科学文章，我们的研究结果被 IREQ、Spar Aerospace/EMS Technologies、CAE Electronics、NRC 航空航天研究所的结构、材料和推进小组、庞巴迪和 P&WC 等公司使用。这些研究产生了以下结果：对可压缩或不可压缩流体流动下的圆柱壳和圆锥壳的振动进行数值模拟。由于这些壳单元广泛应用于航空航天结构中，预测流动下壳的动态不稳定性是航空工程师面临的一个具有挑战性的课题。对于这种包含复杂结构、边界条件、材料和载荷的问题，当影响颤振边界的因素发生变化时，分析模型变得非常复杂。因此，开发了基于混合有限元方法的数值包来描述弯曲壳体的气动弹性行为。与现有的商业 FEM 软件相比，它以更少的计算时间和成本提供非常快速和精确的收敛。这些工作的成果已在国际会议上发表并发表在国际期刊上 [1, 2]。所开发的线性理论足以预测颤振的发生，但是捕获颤振的实际极限环振幅所需的非线性壳理论留给了本提议的研究。