Sensitivity of the Generic Transport Model upset dynamics to time delay
Sensitivity of the Generic Transport Model upset dynamics to time delay
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DOI：
10.2514/6.2014-0611
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发表时间：
2014-01
期刊：
影响因子：
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通讯作者：
S. J. Gill;M. Lowenberg;L. Crespo;S. Neild;B. Krauskopf;G. Puyou
中科院分区：
文献类型：
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作者：
S. J. Gill;M. Lowenberg;L. Crespo;S. Neild;B. Krauskopf;G. Puyou
分叉分析以前已被应用到美国宇航局通用运输模型（GTM），以提供洞察开环颠覆动态和这种行为的影响和敏感性，以关闭与飞行控制器的循环。然而，这些研究没有考虑系统中的时间延迟：这出现在所有反馈控制器中，并且在远程驾驶具有地面控制器的NASA AirSTAR GTM等飞行器时具有特定的相关性。在AirSTAR方案中，将对一个小比例的通用客机模型进行远程失控条件试验，这一方案的发展提高了相对于以前的试验而言，时间延迟的不利影响增加的前景。本文利用分岔分析，辅以时间历程，在GTM数值模型与LQR-PI控制器的闭环系统稳定性的时滞的敏感性进行评估。在本文中，在固定增益和增益调度版本的控制器的时间延迟的影响，提出了在标称和非标称解决方案的稳定性。
Bifurcation analysis has previously been applied to the NASA Generic Transport Model (GTM) to provide insight into open-loop upset dynamics and also the impact on and sensitivity of such behaviour to closing the loop with a flight controller. However, these studies have not considered time delay in the system: this arises in all feedback controllers and has specific relevance when remotely piloting a vehicle such as the NASA AirSTAR GTM with ground-based controllers. Developments in the AirSTAR programme, in which a sub-scale generic airliner model will be tested for loss-of-control conditions over long ranges, raise the prospect of increased adverse effects of time delay relative to previous testing. This paper utilises bifurcation analysis, supplemented with time histories, on the GTM numerical model with a LQR-PI controller to evaluate the sensitivity of the closed-loop system stability to time delay. In this paper, the impact of time delays in both a fixed-gain and a gain-scheduled version of the controller is presented in terms of stability of nominal and off-nominal solutions.