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This special issue is intended to provide a snapshot of current research in the area of ??Global Flow Instability and Control??. The original papers, and to a certain extent the topic itself, are intimately linked with the series of symposia by the same name that were held in Crete, Greece, between 2001 and 2009. As members of the organizing committees of the Crete symposia, we invited all past participants to contribute, and all papers were reviewed following the strict standards of the journal. This preface gives a brief historical account of events that have shaped ideas in the field over the past decade, followed by a synopsis of the papers published herein. 相似文献
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Ati Sharma Vassilis Theofilis Tim Colonius 《Theoretical and Computational Fluid Dynamics》2017,31(5-6):471-474
This special issue is the second on the topic of “Global Flow Instability and Control,” following the first in 2011. As with the previous special issue, the participants of the last two symposia on Global Flow Instability and Control, held in Crete, Greece, were invited to submit publications. These papers were peer reviewed according to the standards of the journal, and this issue represents a snapshot of the progress since 2011. In this preface, a sampling of important developments in the field since the first issue is discussed. A synopsis of the papers in this issue is given in that context. 相似文献
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Qinglei Hu 《Nonlinear dynamics》2008,52(3):227-248
This paper presents a dual-stage control system design method for the three-axis-rotational maneuver control and vibration
stabilization of a spacecraft with flexible appendages embedded with piezoceramics as sensor and actuator. In this design
approach, the attitude control system and vibration suppression were designed separately using a lower order model. Based
on the sliding mode control (SMC) theory, a discontinuous attitude control law in the form of the input voltage of the reaction
wheel is derived to control the orientation of the spacecraft actuated by the reaction wheel, in which the reaction wheel
dynamics is also considered from the real applications point of view. The asymptotic stability is shown using Lyapunov analysis.
Furthermore, an adaptive version of the proposed attitude control law is also designed for adapting the unknown upper bounds
of the lumped disturbance so that the limitation of knowing the bound of the disturbance in advance is released. In addition,
the concept of varying the width of boundary layer instead of a fixed one is also employed to eliminate the chattering and
improve the pointing precision as well. For actively suppressing the induced vibration, modal velocity feedback and strain
rate feedback control methods are presented and compared by using piezoelectric materials as additional sensors and actuators
bonded on the surface of the flexible appendages. Numerical simulations are performed to show that rotational maneuver and
vibration suppression are accomplished in spite of the presence of disturbance torque and parameter uncertainty. 相似文献
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Tetsuya Matsuda 《International Journal of Plasticity》2011,27(12):1869-1870
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