A sliding mode approach for control and estimation in active aircraft

主动飞机控制和估计的滑模方法

• 批准号: EP/G036411/1
• 负责人: Christopher Edwards
• 金额: $ 11.02万
• 依托单位: University of Leicester
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2009
• 资助国家: 英国
• 起止时间: 2009 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FG036411%2F1
• 关键词: sliding; mode; approach; control; estimation; sliding; mode; approach; control; estimation

Monitoring the effectiveness of any drag reduction scheme is vitally important to instil a level of confidence in its effectiveness. The active or passive drag reduction schemes will represent a 'hidden' technology on the aircraft in the sense that their effects and proper functioning will not be readily visible to the naked eye. Monitoring the efficiency of any flow control or drag reduction scheme over long periods of operation allows the pilot to estimate more accurately the required fuel reserve and assists the ground crews by indicating issues requiring inspection/maintenance which may have arisen during a flight. The objective is to utilize sliding mode observers to monitor changes in the performance of the aircraft which can be correlated to changes in the overall drag performance. Changes in drag will be formulated as unknown (and unmeasurable) changes in the aircraft system and will be estimated utilizing the equivalent output error injection signal necessary to maintain sliding. Direct development of nonlinear observers based on the nonlinear longitudinal equations of motion eliminate the errors associated with the approximations arising from linearizing - which appear to be significant when considering the level of accuracy required to estimate 1% changes in the overall drag. Sliding mode observer schemes are ideally suited to cope with such scenarios since the design process is not limited to linear system representations. All the different strategies that will be developed can be viewed as monitoring systems working independently of each other. The 'central nervous system' can then adopt a higher level monitoring objective, confirming genuine drag reduction, detecting sensor faults, and raising alarms when confronted with issues of inaccurate measurements or faults.

监测任何减免方案的有效性对于灌输对其有效性的信心至关重要。主动或被动的减阻方案将代表飞机上的“隐藏”技术，因为它们的效果和正常功能不容易被肉眼看不见。在长时间的运行中监视任何流量控制或减少阻力方案的效率，可以使飞行员更准确地估算所需的燃油储备，并通过指示需要检查/维护可能在飞行过程中出现的检查/维护的问题来协助地面人员。目的是利用滑动模式观察者来监视飞机性能的变化，这可以与整体阻力性能的变化相关。阻力的变化将被表述为飞机系统中未知（和无法衡量的）变化，并通过维持滑动所需的等效输出误差注入信号来估计。基于非线性纵向运动方程的非线性观察者的直接开发消除了与线性化引起的近似相关的误差 - 考虑到估计整体阻力的1％变化所需的准确性水平，这似乎很重要。滑动模式观察者方案非常适合应对此类情况，因为设计过程不限于线性系统表示。所有将要开发的不同策略都可以看作是彼此独立工作的监视系统。然后，“中枢神经系统”可以采用更高层次的监测目标，确认降低真正的阻力，检测传感器故障并在面对不准确的测量或故障问题时提高警报。