It is important to account for uncertainties in aeroelastic response when designing and certifying aircraft. However, aeroelastic uncertainties are particularly challenging to quantify, since dynamic stability is a binary property (stable or unstable) that may be sensitive to small variations in system parameters. To correctly discern stability, the interactions between fluid and structure must be accurately captured. Such interactions involve an energy flow through the interface, which if unbalanced, can destablize the structure. With conventional computational techniques, the consequences of imbalance may require large simulation times to discern, and evaluating the dependence of stability on numerous system parameters can become intractable. In this chapter, the challenges in quantifying aeroelastic uncertainties will be explored and numerical methods will be described to decrease the difficulty of quantifying aeroelastic uncertainties and increase the reliability of aircraft structures subjected to airloads. A series of aeroelastic analyses and reliability studies will be carried out to illustrate key concepts.

中文翻译：

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气动弹性中的不确定性量化

在设计和认证飞机时，考虑气动弹性响应的不确定性很重要。然而，气动弹性不确定性的量化尤其具有挑战性，因为动态稳定性是一个二元属性（稳定或不稳定），可能对系统参数的微小变化很敏感。为了正确识别稳定性，必须准确捕捉流体和结构之间的相互作用。这种相互作用涉及通过界面的能量流，如果不平衡，可能会破坏结构。使用传统的计算技术，不平衡的后果可能需要大量的模拟时间来辨别，并且评估稳定性对众多系统参数的依赖性可能变得难以处理。在这一章当中，将探讨量化气动弹性不确定性的挑战，并描述数值方法，以降低量化气动弹性不确定性的难度，并提高承受空载的飞机结构的可靠性。将进行一系列气动弹性分析和可靠性研究，以说明关键概念。