Reduction of friction drag in subsonic flow via feedback control

通过反馈控制减少亚音速流中的摩擦阻力

基本信息

项目摘要

During the first funding period of the research group ¿Active drag reduction via wavy surface oscillation¿ model reduction for distributed parameter systems and subsequent model based control strategies have been investigated by subproject 3. First, the methods were applied to onedimensional sample systems and then, they have been transferred to the 3D-Navier-Stokes case. However, only steady inflow conditions have been considered so far. These results are to be transferred to time dependent inflow conditions in the second funding period. At first, the inflow conditions are assumed to be known to the controller. Using this information an open-loop disturbance rejection can be established. In a second step, this information will not be provided to the controller. The inflow condition becomes an unknown disturbance, which can be only determined from its influence on the friction drag. Thus, the plant model has to span the whole operating range of possible inflow conditions. For the accompanying model reduction, different methods to generate a functional basis are investigated additionally to the Proper Orthogonal Decomposition, which has already been used. The results from this comparison are used in the next step to set up a parametric reduced-order model. This model can either be built from a global basis or from an interpolation between set of local bases. The controller should include the knowledge from this extended model. For this purpose, nonlinear methods are investigated as well as robust approaches. For the latter, one idea to reduce the conservatism in the design is to incorporate knowledge about the probability distribution of the inflow condition.
在研究小组的第一个资助期间,通过波浪表面振荡进行主动减阻,子项目3研究了分布式参数系统的模型缩减以及随后基于模型的控制策略。首先,将该方法应用于一维样品系统,然后将其应用于三维navier - stokes情况。然而,到目前为止,只考虑了稳定的流入条件。这些结果将在第二个资助期转移到随时间变化的流入条件。首先,假定流入条件是控制器已知的。利用这些信息可以建立开环抑制干扰。在第二步中,将不向控制器提供此信息。流入条件成为一个未知的扰动,只能通过其对摩擦阻力的影响来确定。因此,工厂模型必须跨越可能流入条件的整个运行范围。对于相应的模型约简,除了已经使用的适当正交分解之外,还研究了生成函数基的不同方法。该比较的结果将用于下一步建立参数化降阶模型。该模型既可以建立在全局基础上,也可以建立在一组局部基础之间的插值上。控制器应该包含来自这个扩展模型的知识。为此,研究了非线性方法和鲁棒方法。对于后者,在设计中降低保守性的一种思路是纳入入流条件概率分布的知识。

项目成果

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Professor Dr.-Ing. Dirk Abel其他文献

Professor Dr.-Ing. Dirk Abel的其他文献

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{{ truncateString('Professor Dr.-Ing. Dirk Abel', 18)}}的其他基金

Precise Rendezvous-Control of heterogeneous Aircraft and Ground Vehicle Systems
异构飞机和地面车辆系统的精确交会控制
  • 批准号:
    391925917
  • 财政年份:
    2018
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    --
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    Research Grants
Enhancement of width and thickness tolerances of metallic strips by using a piezo-electric control system for roll gap adjustment of a tandem mill
通过使用压电控制系统调整连轧机的辊缝来提高金属带材的宽度和厚度公差
  • 批准号:
    267239860
  • 财政年份:
    2015
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Individualisierte Modellierung der Herz-Kreislauf-Physiologie bei Rechts-Herz-Insuffizienz (PathoMod)
右心衰竭心血管生理学个体化建模 (PathoMod)
  • 批准号:
    224967331
  • 财政年份:
    2013
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Reglung eines bedarfsorientierten, lastoptimierten linksventrikulären Assist-Systems zur Etablierung einer zielgerichteten Entwöhnungsstrategie im Sinne eines "bridge to recovery" (BeLa-VAD)
控制以需求为导向、负载优化的左心室辅助系统,以建立“恢复之桥”意义上的有针对性的脱机策略(BeLa-VAD)
  • 批准号:
    224967777
  • 财政年份:
    2013
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Entwicklung von neuartigen Online-Verfahren zur optimalen Steuerung hybrider Antriebssysteme
开发用于混合动力驱动系统优化控制的新型在线流程
  • 批准号:
    202140469
  • 财政年份:
    2012
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Regelung von Fahrzeugkolonnen mit topologisch veränderlichem Kommunikationsnetzwerk auf der Basis von Energiemethoden
基于能量方法的拓扑可变通信网络车辆列控制
  • 批准号:
    43086350
  • 财政年份:
    2007
  • 资助金额:
    --
  • 项目类别:
    Priority Programmes
Objektorientierte Modellierung der Kreislauf-Physiologie (PhysioMod)
面向对象的循环生理学建模 (PhysioMod)
  • 批准号:
    36985422
  • 财政年份:
    2007
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Intelligentes, integriertes Einzelrad-Antriebs-Brems-Modul für Schienenfahrzeuge (EABM) Integration regelungstechnischer Funktionen
轨道车辆智能集成单轮驱动制动模块 (EABM) 控制功能集成
  • 批准号:
    22831333
  • 财政年份:
    2006
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Neues interaktives Entwurfsverfahren für robuste PID-Regelungen von linearen Strecken mit Unsicherheiten der Totzeit und der Parameter
具有死区时间和参数不确定性的线性系统稳健 PID 控制的新型交互式设计方法
  • 批准号:
    5448139
  • 财政年份:
    2005
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Durchgängiger Entwurf diskreter Steuerungsprogramme mit Unterstützung durch formale Methoden
形式化方法支持的离散控制程序的端到端设计
  • 批准号:
    14024708
  • 财政年份:
    2005
  • 资助金额:
    --
  • 项目类别:
    Research Grants

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