Topics in Modal Analysis, Volume 7 - Proceedings of the 31st IMAC, A Conference on Structural Dynamics, 2013
Topics in Modal Analysis, Volume 7 - Proceedings of the 31st IMAC, A Conference on Structural Dynamics, 2013
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模态分析主题，第 7 卷 - 第 31 届 IMAC 会议论文集，结构动力学会议，2013 年
DOI：
10.1007/978-1-4614-6585-0_66
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Jiffri S
中科院分区：
文献类型：
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作者：
Jiffri S
飞机上使用主动控制系统来减少阵风和机动造成的负载，减少噪音的影响，并且还可以提高颤振发生的速度。不幸的是，大多数气动伺服弹性系统都包含某种形式的非线性，这增加了反馈系统的复杂性，也增加了发生极限循环振荡的可能性。先前关于将自适应反馈线性化应用于气动弹性系统的工作已经证明了该方法在存在大量非线性的情况下应用控制时的巨大潜力。在这项工作中，自适应反馈线性化应用于发动机挂架中具有立方硬化结构非线性的悬臂柔性机翼的气动弹性模型。使用假设的振动模式，开发了合适的机翼模型，其中纳入了结构非线性。通过自适应反馈线性化算法计算的线性化反馈，在气动伺服弹性系统上实现闭环控制。后者的优点是保证闭环气动弹性系统的稳定性，尽管缺乏对非线性的精确描述的了解。展示了如何使用这种方法来延迟颤振或极限循环振荡的发生。
Active control systems are used on aircraft to reduce loads due to gusts and manoeuvres, reduce the effect of noise, and could also increase the speed at which flutter occurs. Unfortunately most aeroservoelastic systems include some form of nonlinearity, and this increases the complexity of the feedback system and also facilitates the likelihood of Limit Cycle Oscillations occurring. Previous work on the application of Adaptive Feedback Linearisation to aeroelastic systems has demonstrated the promising potential of this method when applying control in the presence of substantial nonlinearity. In this work, Adaptive Feedback Linearisation is applied to an aeroelastic model of a cantilevered flexible wing with a cubic hardening structural nonlinearity in an engine pylon. Using assumed vibration modes, a suitable model of the wing is developed, into which structural nonlinearity is incorporated. Closed-loop control is implemented on the aeroservoelastic system via linearising feedback computed through the Adaptive Feedback Linearisation algorithm. The advantage of the latter is the guaranteed stability of the closed-loop aeroelastic system, despite lack of knowledge of the exact description of the nonlinearity. It is shown how such an approach can be used to delay the onset of flutter or limit cycle oscillations.