Flight control law clearance using optimization-based worst-case search
Flight control law clearance using optimization-based worst-case search
复制标题
使用基于优化的最坏情况搜索进行飞行控制法许可
DOI：
10.3182/20090616-3-il-2002.00057
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
H. Joos
中科院分区：
文献类型：
--
作者：
H. Joos
摘要飞行控制律间隙问题可以被表述为一个鲁棒性分析问题，在该问题中，对于飞机参数、飞行员输入和所有飞行条件的所有允许变化，必须检查一组适当定义的间隙准则，使其处于一定的范围内。基于最坏情况清除的优化思想是使用可用的和有效的优化方法来找到那些违反或不满足标准的参数/输入/飞行条件。这种方法的潜力在于它在频域和时域分析、线性和非线性模型以及包括保护在内的控制律方面的普遍可用性。此外，可以研究的参数不确定性的数量没有限制，并且该方法本身不像许多其他替代方法（主要是基于近似或简化的方法）那样为间隙问题增加保守性。基于优化方法的最具挑战性的问题不是找到存在的隐藏弱点，而是自信地断言所有参数/输入/飞行条件都不存在弱点。要断言这一点，必须找到一个全局最优解，这通常会导致大量的计算工作。针对民用运输机外围飞行包线高度非线性的机动性间隙问题，验证了该优化方法的适用性。研究了不同的全局优化算法和策略，包括其在寻找最坏情况时的可靠性、计算效率和分布式计算的潜力，以减少清除时间。
Abstract The flight control law clearance problem can be formulated as a robustness analysis problem, where a set of suitably defined clearance criteria must be checked to lie within certain limits for all admissible variations of aircraft parameters, pilot inputs and all flight conditions. The idea of optimisation based worst case clearance is to use available and efficient optimisation methods to find those parameters/inputs/flight conditions for which the criteria are violated or poorly satisfied. The potentials of this approach are its general usability for both frequency-domain and time-domain analysis, and for both linear and non-linear models and control laws including protections. Moreover, there is no limitation on the number of parametric uncertainties that can be investigated and the method does not itself add conservatism to the clearance problem as many other alternatives do, mainly those based on approximations or simplifications. The most challenging problem with the optimisation based approach is not to find hidden weaknesses if they exist, but to confidently assert that no weakness exists for all parameters/inputs/flight conditions. To assert this a global optimum solution has to be found usually resulting in a huge amount of computational work. For highly nonlinear clearance problems regarding manoeuvrability in the peripheral flight envelope of a civil transportation aircraft the suitability of the optimisation based approach is demonstrated. Different global optimisation algorithms and strategies are investigated with respect to its reliability in finding worst cases, computational efficiency and its potential for distributed computation in order to reduce time to clearance.